EQ / Equillium, Inc. - Pemfailan SEC, Laporan Tahunan, Penyata Proksi

Equillium, Inc.
US ˙ NasdaqCM ˙ US29446K1060

Statistik Asas
LEI 549300OC7SSPSNNGHE64
CIK 1746466
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Equillium, Inc.
SEC Filings (Chronological Order)
Halaman ini menyediakan senarai kronologi lengkap bagi Pemfailan SEC, tidak termasuk pemfailan pemilikan yang kami sediakan di tempat lain.
September 4, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 29, 2025 Equillium, Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 29, 2025 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Nu

August 14, 2025 EX-4.5

Registration Rights Agreement, dated August 12, 2025, by and between the Registrant and the investors named therein.

Exhibit 4.5 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of August 12, 2025, is entered into by and among Equillium, Inc., a Delaware corporation (the “Company”), and the several investors signatory hereto (individually as an “Investor” and collectively together with their respective permitted assigns, the “Investors”). Capitalized terms used herein

August 14, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM,

August 11, 2025 EX-10.1

Securities Purchase Agreement, dated August 10, 2025, by and among Company and the Investors, incorporated by reference to Exhibit 10.1 of the Registrant's Current Report on Form 8-K, filed with the Securities and Exchange Commission on August 11, 2025.

EX-10.1 Exhibit 10.1 Execution Version SECURITIES PURCHASE AGREEMENT This SECURITIES PURCHASE AGREEMENT (this “Agreement”) is dated as of August 10, 2025, by and among Equillium, Inc., a Delaware corporation (the “Company”), and each of the entities listed on Exhibit A attached to this Agreement (each, an “Investor” and together, the “Investors”). WHEREAS, the Company and the Investors are executi

August 11, 2025 EX-4.2

Form of Pre-Funded Warrant to Purchase Common Stock

EX-4.2 Exhibit 4.2 THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR THE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES. THE SECURITIES HAVE BEEN ACQUIRED FOR INVESTMENT AND MAY NOT BE SOLD, TRANSFERRED OR ASSIGNED UNLESS (I) SUCH SECURITIES HAVE BEEN REGISTERED FOR SALE PURSUANT TO THE SECURITIES ACT, (II) SUCH SE

August 11, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 10, 2025 Equillium, Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 10, 2025 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Nu

August 11, 2025 EX-4.1

Form of Registration Rights Agreement

EX-4.1 Exhibit 4.1 Final Form REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of August [], 2025, is entered into by and among Equillium, Inc., a Delaware corporation (the “Company”), and the several investors signatory hereto (individually as an “Investor” and collectively together with their respective permitted assigns, the “Investors”). Capitalized

August 4, 2025 EX-99.2

Risks Related to Our Financial Position and Need for Additional Capital

Exhibit 99.2 Risks Related to Our Financial Position and Need for Additional Capital Our need for additional capital raises substantial doubt about our ability to continue as a going concern. We will require substantial additional funding, in the immediate term, to continue operations and to resume and complete the planned or future development and any commercialization of EQ504, EQ302 and any fut

August 4, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2025 Equillium, Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 3, 2025 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Num

August 4, 2025 EX-99.1

4 AUGUST 2025

Exhibit 99.1 4 AUGUST 2025 Equillium Announces Strategic Expansion of Cryptocurrency Treasury Reserve Strategy Equillium, Inc. (Nasdaq: EQ), a biotechnology innovator developing novel therapies to treat severe autoimmune and inflammatory disorders, today announced a strategic expansion to integrate a cryptocurrency treasury reserve strategy as part of its broader financial and growth objectives. “

August 4, 2025 EX-10.1

Open Market Sale Agreement, dated as of October 5, 2023, by and between the Registrant and Jefferies LLC, as amended by Amendment No. 1 dated August 3, 2025, incorporated by reference to Exhibit 10.1 of the Registrant's Current Report on Form 8-K, filed with the Securities and Exchange Commission on August 4, 2025.

EX-10.1 Exhibit 10.1 OPEN MARKET SALE AGREEMENTSM October 5, 2023 JEFFERIES LLC 520 Madison Avenue New York, New York 10022 Ladies and Gentlemen: Equillium, Inc., a Delaware corporation (the “Company”), proposes, subject to the terms and conditions stated herein, to issue and sell from time to time through Jefferies LLC, as sales agent and/or principal (the “Agent”), shares of the Company’s common

June 13, 2025 8-K

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 12, 2025 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

May 22, 2025 EX-10.1

Equillium, Inc. 2018 Equity Incentive Plan, as amended.

Exhibit 10.1 EQUILLIUM, INC. 2018 EQUITY INCENTIVE PLAN ADOPTED BY THE BOARD OF DIRECTORS: October 1, 2018 APPROVED BY THE STOCKHOLDERS: October 1, 2018 IPO DATE: October 11, 2018 AMENDED BY THE BOARD OF DIRECTORS: MARCH 26, 2025 APPROVED BY THE STOCKHOLDERS: MAY 21, 2025 1. GENERAL. (a) Successor to and Continuation of Prior Plan. The Plan is intended as the successor to and continuation of the E

May 22, 2025 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 21, 2025 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

May 14, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM

April 30, 2025 DEFR14A

SCHEDULE 14A NOTICE OF ANNUAL MEETING OF STOCKHOLDERS QUESTIONS AND ANSWERS ABOUT THESE PROXY MATERIALS AND VOTING CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS PROPOSAL 1: ELECTION OF DIRECTORS INFORMATION REGARDING THE BOARD OF DIRECTORS AND

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

April 24, 2025 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2025 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Num

April 24, 2025 EX-99.1

Equillium Announces Feedback from the U.S. Food and Drug Administration

Exhibit 99.1 Equillium Announces Feedback from the U.S. Food and Drug Administration LA JOLLA, California, April 24, 2025 – Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company leveraging a deep understanding of immunobiology to develop novel therapeutics to treat severe autoimmune and inflammatory disorders, today announced that the company has received feedback from its Type D me

April 10, 2025 DEFA14A

SCHEDULE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

April 10, 2025 DEF 14A

SCHEDULE 14A NOTICE OF ANNUAL MEETING OF STOCKHOLDERS QUESTIONS AND ANSWERS ABOUT THESE PROXY MATERIALS AND VOTING CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS PROPOSAL 1: ELECTION OF DIRECTORS INFORMATION REGARDING THE BOARD OF DIRECTORS AND

DEF 14A 1 eq-def14a-2025.htm DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as p

March 28, 2025 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

March 27, 2025 EX-99.1

Equillium Reports Fourth Quarter and Full Year 2024 Financial Results and Recent Corporate and Clinical Highlights Announced topline data from the Phase 3 EQUATOR study in first-line acute graft-versus-host disease Breakthrough Therapy designation an

Exhibit 99.1 Equillium Reports Fourth Quarter and Full Year 2024 Financial Results and Recent Corporate and Clinical Highlights Announced topline data from the Phase 3 EQUATOR study in first-line acute graft-versus-host disease Breakthrough Therapy designation and meeting request to discuss potential for Accelerated Approval submitted to FDA, feedback expected during May 2025 LA JOLLA, California,

March 27, 2025 EX-10.24

Stock Purchase Agreement, dated October 4, 2024, by and among Registrant, Ariagen, Inc., the stockholders of Ariagen and the securityholder representative.

Exhibit 10.24 CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT, MARKED BY [***], HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE THE REGISTRANT HAS DETERMINED THAT IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL. CONFIDENTIAL Final Execution Version STOCK PURCHASE AGREEMENT by and among Equillium, Inc., Ariagen, Inc., The Stockholders of Ariagen, Inc. Listed

March 27, 2025 EX-21.1

Subsidiaries of Equillium, Inc.

Exhibit 21.1 SUBSIDIARIES OF EQUILLIUM, INC. Name of Subsidiary Jurisdiction of Incorporation Equillium AUS Pty Ltd. Australia Bioniz Therapeutics, Inc. Delaware Ariagen, Inc. Delaware

March 27, 2025 EX-19.1

Insider Trading Policy

Exhibit 19.1 EQUILLIUM, INC. INSIDER TRADING POLICY Persons Covered This Insider Trading Policy of Equillium, Inc. (the “Company”) applies to all directors, officers, other employees and consultants of the Company and its subsidiaries. It also applies to their family members who reside with them, anyone else who lives in their households and any family members who do not live in their households b

March 27, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 27, 2025 Equillium, Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 27, 2025 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Num

March 27, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 001-38692 EQUILLIUM, INC.

February 6, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 6, 2025 Equillium, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 6, 2025 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File N

December 13, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 13, 2024 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File N

December 12, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 10, 2024 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File N

November 14, 2024 SC 13G/A

EQ / Equillium, Inc. / Decheng Capital Management IV (Cayman), LLC - SC 13G/A Passive Investment

SC 13G/A 1 tm2427620d26sc13ga.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* Equillium, Inc. (Name of Issuer) Common stock, $0.0001 par value per share (Title of Class of Securities) 29446K106 (CUSIP Number) September 30, 2024 (Date of Event Which Requires Filing of this Statement) Check

November 13, 2024 EX-99.1

Equillium Reports Third Quarter 2024 Financial Results and Provides Corporate and Clinical Updates Equillium retains rights to itolizumab following substantial funding from Ono partnership Evaluating accelerating Phase 3 EQUATOR study in aGVHD to com

Exhibit 99.1 Equillium Reports Third Quarter 2024 Financial Results and Provides Corporate and Clinical Updates Equillium retains rights to itolizumab following substantial funding from Ono partnership Evaluating accelerating Phase 3 EQUATOR study in aGVHD to completion in Q1 2025 Phase 2 ulcerative colitis study recently completed; topline data expected Q1 2025 LA JOLLA, California, November 13,

November 13, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUIL

November 13, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 13, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File

October 31, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 October 30, 2024 Date of Report (Date of earliest event reported) Equillium, Inc. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 October 30, 2024 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Nu

October 31, 2024 EX-99.1

Forward-Looking Statements and Other Disclaimers This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,”

EX-99.1 Exhibit 99.1 Itolizumab Update October 31, 2024 Forward-Looking Statements and Other Disclaimers This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,” “objective,” “believe,” “estimate,” “potential,” “continue” and “ongoing,” or the negative of

October 31, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 October 30, 2024 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Nu

August 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM,

August 8, 2024 EX-99.1

Equillium Reports Second Quarter 2024 Financial Results and Provides Recent Corporate and Clinical Highlights $33.3 million cash balance at the end of Q2 2024, representing a $1.0 million increase from the end of Q1 2024 Triggered Ono option exercise

Exhibit 99.1 Equillium Reports Second Quarter 2024 Financial Results and Provides Recent Corporate and Clinical Highlights $33.3 million cash balance at the end of Q2 2024, representing a $1.0 million increase from the end of Q1 2024 Triggered Ono option exercise period to acquire Equillium’s rights to itolizumab, decision expected before the end of October 2024 Announced positive interim analysis

August 8, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 8, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Num

July 23, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 July 19, 2024 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Numbe

July 18, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 Equillium, Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

June 4, 2024 EX-99.1

This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,” “objective,” “believe,” “estimate,” “potential,”

EQ101: Phase 2 Topline Data in Alopecia Areata June 2024 Exhibit 99.1 This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,” “objective,” “believe,” “estimate,” “potential,” “continue” and “ongoing,” or the negative of these terms, or other comparable te

June 4, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 4, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

May 23, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 22, 2024 Equillium, Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 22, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

May 9, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Equillium, Inc. (Exac

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Number

May 9, 2024 EX-10.1

Equillium, Inc. 2024 Inducement Plan and Forms of Stock Option Grant Notice, Option Agreement, and Notice of Exercise thereunder.

Exhibit 10.1 Equillium, Inc. 2024 Inducement Plan Adopted by the Board of Directors: March 6, 2024 1. General. (a) Eligible Award Recipients. The only persons eligible to receive grants of Awards under this Plan are individuals who satisfy the standards for inducement grants under Nasdaq Marketplace Rule 5635(c)(4) or 5635(c)(3), if applicable, and the related guidance under Nasdaq IM 5635-1, and

May 9, 2024 EX-99.1

Equillium Reports First Quarter 2024 Financial Results and Provides Recent Clinical Highlights $32.3 million cash balance at the end of Q1 2024 expected to provide cash runway into 2H 2025 Announced positive topline data from Phase 1b EQUALISE study

Exhibit 99.1 Equillium Reports First Quarter 2024 Financial Results and Provides Recent Clinical Highlights $32.3 million cash balance at the end of Q1 2024 expected to provide cash runway into 2H 2025 Announced positive topline data from Phase 1b EQUALISE study of itolizumab in lupus nephritis patients, representing the first of two data sets that will trigger Ono Pharmaceutical’s option exercise

May 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM

April 11, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

April 11, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

April 1, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 1, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

April 1, 2024 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14

March 25, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 001-38692 EQUILLIUM, INC.

March 25, 2024 EX-21.1

Subsidiaries of Equillium, Inc.

Exhibit 21.1 SUBSIDIARIES OF EQUILLIUM, INC. Name of Subsidiary Jurisdiction of Incorporation Equillium AUS Pty Ltd. Australia Bioniz Therapeutics, Inc. Delaware

March 25, 2024 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Equillium, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Share Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, $0.0001 par value

March 25, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 25, 2024 Equillium, Inc. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 25, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Num

March 25, 2024 EX-99.1

Equillium Reports on Fourth Quarter and Full Year 2023 Financial Results and Corporate and Clinical Highlights $40.9 million cash balance at the end of 2023 expected to provide cash runway into 2H 2025 Completed enrollment of Phase 2 clinical study o

Exhibit 99.1 Equillium Reports on Fourth Quarter and Full Year 2023 Financial Results and Corporate and Clinical Highlights $40.9 million cash balance at the end of 2023 expected to provide cash runway into 2H 2025 Completed enrollment of Phase 2 clinical study of EQ101 in alopecia areata: topline data expected in Q2 2024 Presented positive data from Phase 1b EQUALISE study of itolizumab in lupus

March 25, 2024 EX-97.1

Incentive Compensation Recoupment Policy.

Exhibit 97.1 EQUILLIUM, INC. Incentive Compensation Recoupment Policy 1. Introduction The Compensation Committee (the “Compensation Committee”) of the Board of Directors (the “Board”) of Equillium, Inc., a Delaware corporation (the “Company”), has determined that it is in the best interests of the Company and its stockholders to adopt this Incentive Compensation Recoupment Policy (this “Policy”) p

March 25, 2024 S-8

As filed with the Securities and Exchange Commission on March 25, 2024

As filed with the Securities and Exchange Commission on March 25, 2024 Registration No.

March 8, 2024 EX-99.1

EQUILLIUM, INC. 2024 INDUCEMENT PLAN ADOPTED BY THE BOARD OF DIRECTORS: March 6, 2024

EX-99.1 Exhibit 99.1 EQUILLIUM, INC. 2024 INDUCEMENT PLAN ADOPTED BY THE BOARD OF DIRECTORS: March 6, 2024 1. GENERAL. (a) Eligible Award Recipients. The only persons eligible to receive grants of Awards under this Plan are individuals who satisfy the standards for inducement grants under Nasdaq Marketplace Rule 5635(c)(4) or 5635(c)(3), if applicable, and the related guidance under Nasdaq IM 5635

March 8, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 6, 2024 Equillium, Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 6, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

February 23, 2024 424B5

Up to $21,950,000 Common Stock

Filed Pursuant to Rule 424(b)(5) Registration No. 333-269153 PROSPECTUS SUPPLEMENT (To Prospectus Supplement dated October 5, 2023 and Prospectus dated January 18, 2023) Up to $21,950,000 Common Stock This Prospectus Supplement amends and supplements the information in the prospectus supplement, dated October 5, 2023 (the “ATM Prospectus Supplement”), relating to the offer and sale of shares of ou

February 23, 2024 8-K

Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 23, 2024 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File

February 22, 2024 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): February 21, 2024 Equillium, Inc.

January 19, 2024 EX-99.2

Joint Filing Agreement

EX-99.2 3 exhibit992011924.htm EX-99.2 Exhibit 99.2 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, the undersigned agree to the joint filing of a Statement on Schedule 13G (including any and all amendments thereto) with respect to the Common Stock of Equillium, Inc. and further agree to the filing of this agreement as an Exhibit th

January 19, 2024 SC 13G

EQ / Equillium, Inc. / TAKEDA PHARMACEUTICAL CO LTD - SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* EQUILLIUM, INC. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 29446K106 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pu

January 19, 2024 EX-99.1

Identification of the subsidiary which acquired the security being reported on by the parent holding company

EX-99.1 2 exhibit991011924.htm EX-99.1 Exhibit 99.1 Identification of the subsidiary which acquired the security being reported on by the parent holding company. Takeda Pharmaceutical Company Limited’s (“Takeda”) beneficial ownership of the issuer’s common stock (“Common Stock”) consists of 1,842,977 shares of Common Stock held by Takeda Ventures, Inc. (“TVI”). TVI is wholly owned directly by Take

December 21, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 21, 2023 Equillium, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 21, 2023 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File

November 8, 2023 EX-99.2

Equillium Reports Third Quarter 2023 Financial Results and Provides Corporate and Clinical Updates $46.3 million in cash at the end of Q3 2023 expected to provide operating runway into 2025 $1.9 million of cash used in operating activities in Q3 2023

Exhibit 99.2 Equillium Reports Third Quarter 2023 Financial Results and Provides Corporate and Clinical Updates $46.3 million in cash at the end of Q3 2023 expected to provide operating runway into 2025 $1.9 million of cash used in operating activities in Q3 2023 LA JOLLA, California, November 8, 2023 – Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company leveraging a deep understa

November 8, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): November 6, 2023 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File N

November 8, 2023 EX-99.1

Equillium Announces Data from Phase 1b EQUALISE Study Presented at the 2023 Annual Meeting of the American Society of Nephrology Itolizumab continues to show clinically meaningful response in highly proteinuric subjects At Week 28, 73% of subjects ac

Exhibit 99.1 Equillium Announces Data from Phase 1b EQUALISE Study Presented at the 2023 Annual Meeting of the American Society of Nephrology Itolizumab continues to show clinically meaningful response in highly proteinuric subjects At Week 28, 73% of subjects achieved >50% reduction in urine protein creatinine ratio (UPCR) Itolizumab demonstrated a favorable safety and tolerability profile LA JOL

November 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUIL

October 16, 2023 EX-99.1

Forward-Looking Statements This presentation contains forward-looking statements about Equillium, Inc. (the Actual results or events could differ materially from the plans, intentions and “Company”). In some cases, you can identify forward-looking st

Exhibit 99.1 Analyst & Investor Day With Dr. Arash Mostaghimi October 16, 2023 Forward-Looking Statements This presentation contains forward-looking statements about Equillium, Inc. (the Actual results or events could differ materially from the plans, intentions and “Company”). In some cases, you can identify forward-looking statements by expectations disclosed or implied in the forward-looking st

October 16, 2023 8-K

Regulation FD Disclosure

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 16, 2023 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File N

October 5, 2023 424B5

Up to $6,340,000 Common Stock

Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-269153 PROSPECTUS SUPPLEMENT (To Prospectus dated January 18, 2023) Up to $6,340,000 Common Stock We have entered into an Open Market Sale AgreementSM, or sales agreement, with Jefferies LLC, or Jefferies, relating to shares of our common stock offered by this prospectus supplement and the accompanying prospectus. In accordanc

October 5, 2023 EX-1.1

Open Market Sale Agreement, dated as of October 5, 2023, by and between Equillium, Inc. and Jefferies LLC

Exhibit 1.1 OPEN MARKET SALE AGREEMENTSM October 5, 2023 JEFFERIES LLC 520 Madison Avenue New York, New York 10022 Ladies and Gentlemen: Equillium, Inc., a Delaware corporation (the “Company”), proposes, subject to the terms and conditions stated herein, to issue and sell from time to time through Jefferies LLC, as sales agent and/or principal (the “Agent”), shares of the Company’s common stock, p

October 5, 2023 8-K

Current Report

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 3, 2023 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Nu

August 9, 2023 EX-10.2

Clinical Supply Agreement, dated May 22, 2017, by and between the Registrant and Biocon SA (which was subsequently assigned to Biocon Limited effective March 2018), incorporated by reference to Exhibit 10.2 of the Registrant’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 9, 2023.

CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT, MARKED BY […***…], HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE THE REGISTRANT HAS DETERMINED THAT IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

August 9, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM,

August 9, 2023 EX-99.1

Equillium Reports Second Quarter 2023 Financial Results and Provides Corporate and Clinical Updates $48.4 million in cash at the end of Q2 2023 expected to provide operating runway into 2025 Fully prepaid and retired debt facility Authorized $7.5 mil

Exhibit 99.1 Equillium Reports Second Quarter 2023 Financial Results and Provides Corporate and Clinical Updates $48.4 million in cash at the end of Q2 2023 expected to provide operating runway into 2025 Fully prepaid and retired debt facility Authorized $7.5 million stock repurchase program LA JOLLA, California, August 9, 2023 – Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company

August 9, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 9, 2023 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Num

August 9, 2023 EX-10.1

Collaboration and License Agreement, dated May 22, 2017, by and between the Registrant and Biocon SA (which was subsequently assigned to Biocon Limited effective March 2018), incorporated by reference to

CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT, MARKED BY […***…], HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE THE REGISTRANT HAS DETERMINED THAT IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

May 25, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 25, 2023 Equillium, Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 25, 2023 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

May 23, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 22, 2023 Equillium, Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 22, 2023 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

May 11, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 11, 2023 EQUILLIUM, INC. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 11, 2023 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Numbe

May 11, 2023 EX-99.1

Equillium Reports First Quarter 2023 Financial Results and Provides Clinical Updates $62.0 million cash balance at the end of Q1 2023 expected to provide operating runway into 2025 Presented Phase 1b EQUATE data in aGVHD highlighting rapid and durabl

Exhibit 99.1 Equillium Reports First Quarter 2023 Financial Results and Provides Clinical Updates $62.0 million cash balance at the end of Q1 2023 expected to provide operating runway into 2025 Presented Phase 1b EQUATE data in aGVHD highlighting rapid and durable rates of overall clinical response, clinical response associated with improved progression-free survival through one year, and steroid

May 11, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM

April 13, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.__)

DEFA14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

April 11, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.__)

DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

April 6, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 April 5, 2023 Date of Report (Date of earliest event reported) Equillium, Inc. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 April 5, 2023 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Numbe

March 31, 2023 PRE 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.__)

PRE 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☒ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

March 23, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 001-38692 EQUILLIUM, INC.

March 23, 2023 EX-10

Asset Purchase Agreement, dated December 5, 2022, by and between the Registrant and Ono Pharmaceutical Co., Ltd.

CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT, MARKED BY [***], HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE THE REGISTRANT HAS DETERMINED THAT IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

March 23, 2023 EX-10

Fifth Amendment to Collaboration and License Agreement by and between Registrant and Biocon Limited, dated November 18, 2022, incorporated by reference to Exhibit 10.29 of the Registrant's Annual Report on Form 10-K, filed with the Securities and Exchange Commission on March 23, 2023.

CERTAIN INFORMATION CONTAINED IN THIS EXHIBIT, MARKED BY [***], HAS BEEN EXCLUDED FROM THIS EXHIBIT BECAUSE THE REGISTRANT HAS DETERMINED THAT IT IS BOTH NOT MATERIAL AND IS THE TYPE THAT THE REGISTRANT TREATS AS PRIVATE OR CONFIDENTIAL.

March 23, 2023 EX-99.1

Equillium Reports Fourth Quarter and Full Year 2022 Financial Results and Provides Corporate & Clinical Development Updates $71.0 million cash balance at the end of 2022 expected to provide cash runway into 2025 Acquired Bioniz Therapeutics, includin

EX-99.1 Exhibit 99.1 Equillium Reports Fourth Quarter and Full Year 2022 Financial Results and Provides Corporate & Clinical Development Updates $71.0 million cash balance at the end of 2022 expected to provide cash runway into 2025 Acquired Bioniz Therapeutics, including two first-in-class clinical-stage assets, EQ101 and EQ102, and proprietary product discovery platform Initiated Phase 2 clinica

March 23, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 March 23, 2023 Date of Report (Date of earliest event reported) Equillium, Inc. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 March 23, 2023 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Numb

March 23, 2023 EX-21

Subsidiaries of Equillium, Inc.

Exhibit 21.1 SUBSIDIARIES OF EQUILLIUM, INC. Name of Subsidiary Jurisdiction of Incorporation Equillium AUS Pty Ltd. Australia Bioniz Therapeutics, Inc. Delaware Triumph Acquisition Sub, Inc. Delaware Equillium Acquisition Sub, Inc. Delaware Triumph Merger Sub, Inc. Delaware

March 3, 2023 SC 13G/A

EQ / Equillium Inc / VICTORY CAPITAL MANAGEMENT INC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. 5)* Equillium, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 29446K106 (CUSIP Number) February 28, 2023 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedu

February 23, 2023 RW

Equillium, Inc. 2223 Avenida de la Playa Suite 105 La Jolla, California 92037

RW Equillium, Inc. 2223 Avenida de la Playa Suite 105 La Jolla, California 92037 February 23, 2023 VIA EDGAR Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attention: Tim Buchmiller Re: Equillium, Inc. Request for Withdrawal of Registration Statement on Form S-4 File No. 333-268024 Dear Mr. Buchmiller: Pursuant to Rule 477 of the Securi

January 31, 2023 SC 13G/A

EQ / Embarq Corp / VICTORY CAPITAL MANAGEMENT INC Passive Investment

SC 13G/A 1 equillium13ga4123122.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. 4)* Equillium, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 29446K106 (CUSIP Number) December 31, 2022 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate th

January 13, 2023 CORRESP

Equillium, Inc. 2223 Avenida de la Playa Suite 105 La Jolla, CA 92037

Equillium, Inc. 2223 Avenida de la Playa Suite 105 La Jolla, CA 92037 January 13, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attn: Alan Campbell Re: Equillium, Inc. Registration Statement on Form S-3 Filed: January 6, 2023 File No. 333-269153 Ladies and Gentlemen: Pursuant to Rule 461 under the Securitie

January 6, 2023 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Equillium, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly R

January 6, 2023 EX-4.9

Form of Common Stock Warrant Agreement and Warrant Certificate.

Exhibit 4.9 EQUILLIUM, INC. AND , AS WARRANT AGENT FORM OF COMMON STOCK WARRANT AGREEMENT DATED AS OF EQUILLIUM, INC. FORM OF COMMON STOCK WARRANT AGREEMENT THIS COMMON STOCK WARRANT AGREEMENT (this ?Agreement?), dated as of [?], between EQUILLIUM, INC., a Delaware corporation (the ?Company?), and [?], a [corporation] [national banking association] organized and existing under the laws of [?] and

January 6, 2023 S-8

As filed with the Securities and Exchange Commission on January 6, 2023

As filed with the Securities and Exchange Commission on January 6, 2023 Registration No.

January 6, 2023 EX-4.6

Form of Indenture, between the Registrant and one or more trustees to be named.

Exhibit 4.6 EQUILLIUM, INC., Issuer AND [TRUSTEE], Trustee INDENTURE Dated as of [?], 20 Debt Securities TABLE OF CONTENTS PAGE ARTICLE 1 DEFINITIONS 1 Section 1.01 Definitions of Terms 1 ARTICLE 2 ISSUE, DESCRIPTION, TERMS, EXECUTION, REGISTRATION AND EXCHANGE OF SECURITIES 5 Section 2.01 Designation and Terms of Securities 5 Section 2.02 Form of Securities and Trustee?s Certificate 7 Section 2.0

January 6, 2023 EX-4.10

Form of Preferred Stock Warrant Agreement and Warrant Certificate.

Exhibit 4.10 EQUILLIUM, INC. AND , AS WARRANT AGENT FORM OF PREFERRED STOCK WARRANT AGREEMENT DATED AS OF EQUILLIUM, INC. FORM OF PREFERRED STOCK WARRANT AGREEMENT THIS PREFERRED STOCK WARRANT AGREEMENT (this ?Agreement?), dated as of [?], between EQUILLIUM, INC., a Delaware corporation (the ?Company?), and [?], a [corporation] [national banking association] organized and existing under the laws o

January 6, 2023 EX-FILING FEES

Filing Fee Table.

EX-FILING FEES 4 d448098dexfilingfees.htm EX-FILING FEES Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Equillium, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of

January 6, 2023 S-3

As filed with the Securities and Exchange Commission on January 6, 2023

S-3 1 d448314ds3.htm S-3 Table of Contents As filed with the Securities and Exchange Commission on January 6, 2023 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 82-1554746 (State or other jurisdiction of inc

January 6, 2023 EX-4.11

Form of Debt Securities Warrant Agreement and Warrant Certificate.

Exhibit 4.11 EQUILLIUM, INC. AND , AS WARRANT AGENT FORM OF DEBT SECURITIES WARRANT AGREEMENT DATED AS OF EQUILLIUM, INC. FORM OF DEBT SECURITIES WARRANT AGREEMENT THIS DEBT SECURITIES WARRANT AGREEMENT (this ?Agreement?), dated as of [?], between EQUILLIUM, INC., a Delaware corporation (the ?Company?), and [?], a [corporation] [national banking association] organized and existing under the laws o

December 23, 2022 EX-99.1

Equillium and Metacrine Mutually Agree to Terminate Definitive Merger Agreement

Exhibit 99.1 Equillium and Metacrine Mutually Agree to Terminate Definitive Merger Agreement LA JOLLA, California, December 23, 2022 ? Equillium, Inc. (Nasdaq: EQ) and Metacrine, Inc. today announced the mutual termination of their previously announced definitive merger agreement. ?Equillium first set out to acquire Metacrine in an all-stock transaction in early 2022, with the intent of adding cas

December 23, 2022 8-K

Termination of a Material Definitive Agreement, Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 20, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File N

December 15, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 14, 2022 Date of Report (Date of earliest event reported) Equillium, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 14, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File N

December 15, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 14, 2022 Date of Report (Date of earliest event reported) Equillium, Inc.

425 1 d429598d425.htm 425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 14, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorpo

December 6, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 5, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Nu

December 6, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 5, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (

425 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 December 5, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission Fil

December 6, 2022 425

Filings under Rule 425 under the Securities Act of 1933

425 1 d406851d425.htm 425 Filings under Rule 425 under the Securities Act of 1933 and deemed filed under Rule 14a-12 of the Securities Exchange Act of 1934 Filing by: Equillium, Inc. Subject Company: Equillium, Inc. SEC File No.: 333-268024 C O R P O R A T E P A R T I C I P A N T S Bruce Steel, Chief Executive Officer, Equillium, Inc. C O N F E R E N C E C A L L P A R T I C I P A N T S Catherine N

December 6, 2022 EX-99.1

Equillium and Ono Pharmaceutical Announce Exclusive Option and Asset Purchase Agreement for the Development and Commercialization of Itolizumab Equillium grants Ono an option to purchase rights to itolizumab Equillium to receive an upfront payment of

Exhibit 99.1 Equillium and Ono Pharmaceutical Announce Exclusive Option and Asset Purchase Agreement for the Development and Commercialization of Itolizumab Equillium grants Ono an option to purchase rights to itolizumab Equillium to receive an upfront payment of approximately $26.0M (?3.5B); eligible to receive up to approximately $138.5M (?18.7B) in option exercise and milestone payments Ono to

December 6, 2022 EX-99.2

Statements contained in this presentation regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the

Equillium & Ono Pharmaceutical Exclusive Option and Asset Purchase Agreement for the Development and Commercialization of Itolizumab 6 December 2022 Exhibit 99.

November 14, 2022 EX-99.1

Equillium Reports Third Quarter 2022 Financial Results and Provides Corporate and Clinical Updates Announced positive interim results from the EQUALISE study of itolizumab in highly proteinuric lupus nephritis patients: by week 28, 83% achieved compl

Exhibit 99.1 Equillium Reports Third Quarter 2022 Financial Results and Provides Corporate and Clinical Updates Announced positive interim results from the EQUALISE study of itolizumab in highly proteinuric lupus nephritis patients: by week 28, 83% achieved complete or partial response, and 67% achieved > 80% reduction in urine protein creatinine ratio Announced the pending acquisition of Metacrin

November 14, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUIL

November 14, 2022 425

Equillium Reports Third Quarter 2022 Financial Results and Provides Corporate and Clinical Updates Announced positive interim results from the EQUALISE study of itolizumab in highly proteinuric lupus nephritis patients: by week 28, 83% achieved compl

Filings under Rule 425 under the Securities Act of 1933 and deemed filed under Rule 14a-12 of the Securities Exchange Act of 1934 Filing by: Equillium, Inc.

November 14, 2022 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): November 14, 2022 EQUILLIUM, INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): November 14, 2022 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File

November 10, 2022 424B3

MERGER PROPOSAL—YOUR VOTE IS VERY IMPORTANT

424B3 1 ny20005283x4424b3.htm 424B3 TABLE OF CONTENTS Filed pursuant to Rule 424(b)(3) Registration No. 333-268024 MERGER PROPOSAL—YOUR VOTE IS VERY IMPORTANT     Dear stockholders of Equillium, Inc. and stockholders of Metacrine, Inc.: As previously announced, the board of directors of Equillium, Inc., or Equillium, and the board of directors of Metacrine, Inc., or Metacrine, have approved an acq

November 9, 2022 EX-99.2

November 9, 2022

Exhibit 99.2 November 9, 2022 Board of Directors Metacrine, Inc. (in its capacity as such) 3985 Sorrento Valley Blvd, Suite C San Diego, CA 92121 Members of the Board of Directors: We hereby consent to the inclusion of our opinion letters, dated September 2, 2022 and October 19, 2022, to the Board of Directors of Metacrine, Inc. (“Metacrine”) as Annexes C-1 and C-2, respectively, to, and reference

November 9, 2022 EX-99.5

EX-99.5

Exhibit 99.5

November 9, 2022 S-4/A

As filed with the Securities and Exchange Commission on November 9, 2022

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on November 9, 2022 Registration No.

November 9, 2022 EX-FILING FEES

Calculation of Filing Fee Table Form S-4 (Form Type) Equillium, Inc. (Exact name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table Form S-4 (Form Type) Equillium, Inc. (Exact name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, par value $0.0001 per

November 9, 2022 CORRESP

Equillium, Inc. 2223 Avenida de la Playa, Suite 105 La Jolla, California 92037

CORRESP 1 filename1.htm Equillium, Inc. 2223 Avenida de la Playa, Suite 105 La Jolla, California 92037 November 9, 2022 Via Edgar United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549 Attn: Tim Buchmiller Re: Equillium, Inc. Registration Statement on Form S-4 (File No. 333-268024) Dear Mr. Austin: This letter is sent on behalf of

November 9, 2022 EX-99.4

EX-99.4

Exhibit 99.4

November 9, 2022 EX-99.1

November 8, 2022

Exhibit 99.1 November 8, 2022 Board of Directors Equillium, Inc. 2223 Avenida de la Playa, Suite 105 La Jolla, CA 92037 Re: Amendment No. 1 to the Registration Statement on Form S-4 of Equillium, Inc. (File No. 333-268024), filed on November 8, 2022, relating to shares of Common Stock, par value $0.0001 per share (the “Registration Statement”) Ladies and Gentlemen: Reference is made to our opinion

November 9, 2022 EX-21.1

SUBSIDIARIES OF EQUILLIUM, INC.

Exhibit 21.1 SUBSIDIARIES OF EQUILLIUM, INC. Name of Subsidiary Jurisdiction of Incorporation Equillium AUS Pty Ltd. Australia Bioniz Therapeutics, Inc. Delaware Triumph Acquisition Sub, Inc. Delaware Equillium Acquisition Sub, Inc. Delaware Triumph Merger Sub, Inc. Delaware

October 27, 2022 EX-99.1

October 26, 2022

Exhibit 99.1 October 26, 2022 Board of Directors Equillium, Inc. 2223 Avenida de la Playa, Suite 105 La Jolla, CA 92037 Re: Initially Filed Registration Statement on Form S-4 of Equillium, Inc. (File No. 333- ), filed on October 26, 2022, relating to shares of Common Stock, par value $0.0001 per share (the “Registration Statement”) Ladies and Gentlemen: Reference is made to our opinion letter, dat

October 27, 2022 EX-FILING FEES

Calculation of Filing Fee Table Form S-4 (Form Type) Equillium, Inc. (Exact name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities

Exhibit 107 Calculation of Filing Fee Table Form S-4 (Form Type) Equillium, Inc. (Exact name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, par value $0.0001 per

October 27, 2022 S-4

Agreement and Plan of Merger, dated September 6, 2022, by and among the Registrant, Metacrine, Equillium Acquisition Sub, Inc., Triumph Acquisition Sub, Inc., and Triumph Merger Sub, Inc., as amended by Amendment No. 1 to Agreement and Plan of Merger, dated October 26, 2022, incorporated by reference to Exhibit 2.1 of the Registrant’s Registration Statement on Form S-4 (File No. 333-268024), originally filed with the Securities and Exchange Commission on October 27, 2022.

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on October 27, 2022 Registration No.

October 27, 2022 EX-99.4

EX-99.4

Exhibit 99.4

October 27, 2022 EX-99.2

October 25, 2022

Exhibit 99.2 October 25, 2022 Board of Directors Metacrine, Inc. (in its capacity as such) 3985 Sorrento Valley Blvd, Suite C San Diego, CA 92121 Members of the Board of Directors: We hereby consent to the inclusion of our opinion letters, dated September 2, 2022 and October 19, 2022, to the Board of Directors of Metacrine, Inc. (“Metacrine”) as Annexes C-1 and C-2, respectively, to, and reference

October 27, 2022 EX-21.1

SUBSIDIARIES OF EQUILLIUM, INC.

Exhibit 21.1 SUBSIDIARIES OF EQUILLIUM, INC. Name of Subsidiary Jurisdiction of Incorporation Equillium AUS Pty Ltd. Australia Bioniz Therapeutics, Inc. Delaware Triumph Acquisition Sub, Inc. Delaware Equillium Acquisition Sub, Inc. Delaware Triumph Merger Sub, Inc. Delaware

September 28, 2022 425

Filed by Equillium, Inc.

425 1 d374196d425.htm 425 Filed by Equillium, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Commission File No.: 001-38692 Subject Company: Metacrine, Inc. Commission File No.: 001-39512 Date: September 27, 2022 Event ID: 8770084 Event Title: Equillium Announces Interim Data from Type B Portion of EQUALISE Study in Patients with Lupus Nephritis Date: 09/27/2022 Executives: Bruce Steel

September 27, 2022 EX-99.1

Safe Harbor Statement This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). Statements contained in this presentation regarding matters that are not historical facts are “forward-looking statements” within the m

EQUALISE Interim Data Type B: Lupus Nephritis Patients 27 September 2022 Exhibit 99.

September 27, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 September 27, 2022 Date of Report (Date of earliest event reported) Equillium, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 September 27, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File

September 27, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 September 27, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File

September 26, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 September 26, 2022 Date of Report (Date of earliest event reported) Equillium, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 September 26, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File

September 26, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 September 26, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File

September 26, 2022 EX-99.2

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.2 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION The following unaudited pro forma condensed combined financial information is presented to illustrate the estimated effects of the proposed acquisition by Equillium, Inc. (?Equillium? or the ?Company?) of Metacrine, Inc. (?Metacrine?) pursuant to an Agreement and Plan of Merger (the ?Merger Agreement?) executed on September

September 26, 2022 EX-99.3

On September 6, 2022, Equillium, Inc., or Equillium, Equillium Acquisition Sub, Inc., a Delaware corporation and wholly owned subsidiary of Equillium, or Acquisition Sub, Triumph Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of

Exhibit 99.3 On September 6, 2022, Equillium, Inc., or Equillium, Equillium Acquisition Sub, Inc., a Delaware corporation and wholly owned subsidiary of Equillium, or Acquisition Sub, Triumph Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Acquisition Sub, or Merger Sub, and Metacrine, Inc., a Delaware corporation, or Metacrine, entered into an Agreement and Plan of Merger,

September 26, 2022 EX-99.1

Report of Independent Registered Public Accounting Firm

Exhibit 99.1 Report of Independent Registered Public Accounting Firm To the Stockholders and the Board of Directors of Metacrine, Inc. Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of Metacrine, Inc. (the Company) as of December 31, 2021 and 2020, the related consolidated statements of operations and comprehensive loss, convertible preferred stock

September 7, 2022 425

Filed by Equillium, Inc.

Filed by Equillium, Inc. Pursuant to Rule 425 under the Securities Act of 1933 Commission File No.: 001-38692 Subject Company: Metacrine, Inc. Commission File No.: 001-39512 Date: September 7, 2022 The following is a transcript of the audio recording of a conference call that took place on September 7, 2022 regarding the strategic transaction. The audio recording was made available on Equillium, I

September 6, 2022 8-K

Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 6, 2022 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File

September 6, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 6, 2022 Equillium, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 6, 2022 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File

September 6, 2022 EX-99.2

This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). Statements contained in this presentation that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigat

Equillium Acquisition of Metacrine, Inc. September 7, 2022 Exhibit 99.2 This presentation contains forward-looking statements about Equillium, Inc. (the ?Company?). Statements contained in this presentation that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the us

September 6, 2022 EX-99.1

Equillium to Acquire Metacrine in All-Stock Transaction Expected to add $33 million in cash at closing to Equillium’s balance sheet and extend operating runway into 2024 Acquisition includes novel drug candidate MET642, an orally delivered Phase 2 re

Exhibit 99.1 Equillium to Acquire Metacrine in All-Stock Transaction Expected to add $33 million in cash at closing to Equillium?s balance sheet and extend operating runway into 2024 Acquisition includes novel drug candidate MET642, an orally delivered Phase 2 ready FXR agonist for ulcerative colitis Preston Klassen, M.D., MHS, to be appointed to the Board of Directors LA JOLLA, California, Septem

September 6, 2022 EX-2.1

Agreement and Plan of Merger, dated September 6, 2022, by and among Equillium, Inc., Metacrine, Inc., Equillium Acquisition Sub, Inc., and Triumph Merger Sub, Inc.

Exhibit 2.1 Execution Version AGREEMENT AND PLAN OF MERGER among EQUILLIUM, INC., METACRINE, INC., EQUILLIUM ACQUISITION SUB, INC. and TRIUMPH MERGER SUB, INC. Dated as of September 6, 2022 TABLE OF CONTENTS Page ARTICLE I THE MERGER; CLOSING; SURVIVING CORPORATION 2 1.1 The Merger 2 1.2 Closing 2 1.3 Effective Time 2 1.4 The Certificate of Incorporation 2 1.5 The Bylaws 2 1.6 Directors of the Sur

August 15, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): August 15, 2022 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Nu

August 15, 2022 EX-99.1

Equillium Reports Second Quarter 2022 Financial Results and Provides Clinical Development Updates

Exhibit 99.1 Equillium Reports Second Quarter 2022 Financial Results and Provides Clinical Development Updates LA JOLLA, California, August 15, 2022 ? Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company focused on developing novel therapeutics to treat severe autoimmune and inflammatory disorders with high unmet medical need, today announced financial results for the second quarte

August 15, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM,

May 25, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 24, 2022 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

May 12, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): May 12, 2022 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Numbe

May 12, 2022 EX-99.1

Equillium Reports First Quarter 2022 Financial Results and Provides Corporate and Clinical Development Updates Initiated EQUATOR Phase 3 study of itolizumab in first-line aGVHD Acquired Bioniz Therapeutics, adding two first-in-class clinical-stage as

Exhibit 99.1 Equillium Reports First Quarter 2022 Financial Results and Provides Corporate and Clinical Development Updates Initiated EQUATOR Phase 3 study of itolizumab in first-line aGVHD Acquired Bioniz Therapeutics, adding two first-in-class clinical-stage assets to pipeline and proprietary product discovery platform LA JOLLA, California, May 12, 2022 - Equillium, Inc. (Nasdaq: EQ), a clinical

May 12, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM

May 9, 2022 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 9, 2022 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Number

May 2, 2022 EX-99.3

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS

Exhibit 99.3 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL STATEMENTS The following unaudited pro forma condensed combined financial information presents the unaudited pro forma condensed combined balance sheet as of September 30, 2021 and statements of operations for the nine months ended September 30, 2021 and year ended December 31, 2020, based upon the combined historical financial statemen

May 2, 2022 8-K/A

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 February 14, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction (Commission File

May 2, 2022 EX-99.2

Bioniz Therapeutics, Inc Interim Condensed Financial Statements For Nine Months Ended September 30, 2021 and September 30, 2020 INDEX TO THE INTERIM CONDENSED FINANCIAL STATEMENTS

Exhibit 99.2 Bioniz Therapeutics, Inc Interim Condensed Financial Statements For Nine Months Ended September 30, 2021 and September 30, 2020 INDEX TO THE INTERIM CONDENSED FINANCIAL STATEMENTS Page Interim Condensed Financial Statements: Condensed Balance Sheets 3 Condensed Statements of Operations and Comprehensive Income (Loss) 4 Condensed Statements of Redeemable Convertible Preferred Stock, Co

May 2, 2022 EX-99.1

Bioniz Therapeutics, Inc Financial Statements For Years Ended December 31, 2020 and 2019 With Report of Independent Auditors INDEX TO THE AUDITED FINANCIAL STATEMENTS

Exhibit 99.1 Bioniz Therapeutics, Inc Financial Statements For Years Ended December 31, 2020 and 2019 With Report of Independent Auditors INDEX TO THE AUDITED FINANCIAL STATEMENTS Page Report of Independent Registered Public Accounting Firm 3 Financial Statements: Balance Sheets 5 Statements of Operations and Comprehensive Loss 6 Statements of Convertible Preferred Stock, Common Stock, and Stockho

April 25, 2022 8-K

Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 25, 2022 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Num

April 13, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

April 13, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.__)

DEF 14A 1 d307419ddef14a.htm DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.) Filed by the Registrant ☒ Filed by a party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as pe

March 23, 2022 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) Equillium, Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock, $0.0001 par value p

March 23, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 23, 2022 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Num

March 23, 2022 EX-10.25

Equillium, Inc. Non-Employee Director Compensation Policy, as amended, incorporated by reference to Exhibit 10.25 of the Registrant’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on March 23, 2022.

Exhibit 10.25 Equillium, Inc. Non-Employee Director Compensation Policy (amended and restated, effective as of March 1, 2022) Each member of the Board of Directors (the ?Board?) who is not also serving as an employee of or consultant to Equillium, Inc. (the ?Company?) or any of its subsidiaries (each such member, an ?Eligible Director?) will receive the compensation described in this Non-Employee

March 23, 2022 EX-10.29

Confidential Separation Agreement and General Release of All Claims dated February 13, 2022, by and between Registrant and Dolca Thomas, M.D.

Exhibit 10.29 CONFIDENTIAL SEPARATION AGREEMENT AND GENERAL RELEASE OF ALL CLAIMS This Confidential Separation Agreement and General Release of All Claims (?Separation Agreement?) is made by and between Equillium, Inc. (?Company?) and Dolca Thomas (?Employee?). The Company and Employee may also be referred to in this Separation Agreement as a Party and collectively as ?the Parties.? A. WHEREAS, Em

March 23, 2022 EX-99.1

Equillium Reports Fourth Quarter and Full Year 2021 Financial Results and Provides Corporate & Clinical Development Updates Announced positive topline data from EQUATE study of itolizumab in first-line aGVHD Initiated EQUATOR Phase 3 study of itolizu

Exhibit 99.1 Equillium Reports Fourth Quarter and Full Year 2021 Financial Results and Provides Corporate & Clinical Development Updates Announced positive topline data from EQUATE study of itolizumab in first-line aGVHD Initiated EQUATOR Phase 3 study of itolizumab in first-line aGVHD Presented interim safety data and reduction in proteinuria from the EQUALISE study of itolizumab in lupus patient

March 23, 2022 EX-10.28

Third Amendment to Loan and Security Agreement by and between Registrant and Oxford Finance LLC, dated February 14, 2022.

Exhibit 10.28 CONSENT AND THIRD AMENDMENT TO LOAN AND SECURITY AGREEMENT THIS CONSENT AND THIRD AMENDMENT to Loan and Security Agreement (this ?Amendment?) is entered into as of February 14, 2022, by and between OXFORD FINANCE LLC, a Delaware limited liability company with an office located at 115 South Union Street, Suite 300, Alexandria, VA 22314 (?Oxford?), as collateral agent (in such capacity

March 23, 2022 EX-10.23

First Amendment to Loan and Security Agreement by and between Registrant and Oxford Finance LLC, dated December 18, 2020.

Exhibit 10.23 FIRST AMENDMENT TO LOAN AND SECURITY AGREEMENT THIS FIRST AMENDMENT to Loan and Security Agreement (this ?Amendment?) is entered into as of December 18, 2020 (the ?Amendment Date?), by and among OXFORD FINANCE LLC, a Delaware limited liability company with an office located at 133 North Fairfax Street, Alexandria, Virginia 22314 (?Oxford?), as collateral agent (in such capacity, ?Col

March 23, 2022 S-8

As filed with the Securities and Exchange Commission on March 23, 2022

As filed with the Securities and Exchange Commission on March 23, 2022 Registration No.

March 23, 2022 EX-21.1

Subsidiaries of Equillium, Inc.

Exhibit 21.1 SUBSIDIARIES OF EQUILLIUM, INC. Name of Subsidiary Jurisdiction of Incorporation Equillium AUS Pty Ltd. Australia Bioniz Therapeutics, Inc. Delaware

March 23, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 001-38692 EQUILLIUM, INC.

March 4, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 4, 2022 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Numb

March 4, 2022 EX-99.1

Equillium Announces Initiation of the Phase 3 EQUATOR Study of Itolizumab in First-line Acute Graft-Versus-Host Disease Pivotal study to enroll up to 200 patients Global study with sites expected in North America, Europe, Asia and Australia Primary e

Exhibit 99.1 Equillium Announces Initiation of the Phase 3 EQUATOR Study of Itolizumab in First-line Acute Graft-Versus-Host Disease Pivotal study to enroll up to 200 patients Global study with sites expected in North America, Europe, Asia and Australia Primary endpoint assessment of Complete Response at Day 29 LA JOLLA, California, March 4, 2022 - Equillium, Inc. (Nasdaq: EQ), a clinical-stage bi

March 2, 2022 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): February 24, 2022 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File

March 2, 2022 EX-99.1

Equillium Announces Appointment of Barbara Troupin to Board of Directors

Exhibit 99.1 Equillium Announces Appointment of Barbara Troupin to Board of Directors LA JOLLA, California, March 1, 2022 - Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company focused on developing novel therapeutics to treat severe autoimmune and inflammatory disorders with high unmet medical need, today announced the appointment of Barbara Troupin, M.D., to the Equillium Board o

February 16, 2022 EX-2.1

Agreement and Plan of Merger, dated February 14, 2022, by and among the Registrant, Bioniz Therapeutics, Inc., Project JetFuel Merger Sub, Inc. and Kevin Green, solely in his capacity as Securityholders’ Representative, incorporated by reference by Exhibit 2.1 of the Registrant’s Current Report on Form 8-K, filed with the Securities and Exchange Commission on February 16, 2022.

Exhibit 2.1 [***] = CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETED ASTERISKS, HAS BEEN OMITTED BECAUSE IT IS BOTH (I) NOT MATERIAL AND (II) WOULD LIKELY CAUSE COMPETITIVE HARM IF PUBLICLY DISCLOSED AGREEMENT AND PLAN OF MERGER by and among Equillium, Inc.; Project JetFuel Merger Sub, Inc.; Bioniz Therapeutics, Inc. and Kevin Green, as the Securityholders? Represen

February 16, 2022 EX-99.2

This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,” “objective,” “believe,” “estimate,” “potential,”

Equillium Acquisition of Bioniz Therapeutics 16 February 2022 Exhibit 99.2 This presentation contains forward-looking statements about Equillium, Inc. (the ?Company?). In some cases, you can identify forward-looking statements by the words ?will,? ?expect,? ?intend,? ?plan,? ?objective,? ?believe,? ?estimate,? ?potential,? ?continue? and ?ongoing,? or the negative of these terms, or other comparab

February 16, 2022 EX-99.1

Equillium Acquires Bioniz Therapeutics Significantly Expanding Pipeline of Novel Immunomodulatory Drug Candidates Acquisition includes two first-in-class clinical-stage assets and proprietary product discovery platform Creates a robust immunology pip

Exhibit 99.1 Equillium Acquires Bioniz Therapeutics Significantly Expanding Pipeline of Novel Immunomodulatory Drug Candidates Acquisition includes two first-in-class clinical-stage assets and proprietary product discovery platform Creates a robust immunology pipeline with significant value-creating milestones, and provides a strong clinical and research team with complementary expertise in immuno

February 16, 2022 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Completion of Acquisition or Disposition of Assets, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 February 11, 2022 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File N

February 14, 2022 SC 13G

EQ / Embarq Corp / Decheng Capital Management III (Cayman), LLC - SC 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Equillium Inc. (Name of Issuer) Common Stock, $0.0001 Par Value (Title of Class of Securities) 29446K106 (CUSIP Number) Laura Tse 3000 Sand Hill Road, Building 2, Suite 110 Menlo Park, CA 94025, USA 650-233-0688 (Name, Address and Telephone Number of Pers

February 1, 2022 SC 13G/A

EQ / Embarq Corp / VICTORY CAPITAL MANAGEMENT INC Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. 3)* Equillium, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 29446K106 (CUSIP Number) December 31, 2021 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedu

November 10, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUIL

November 10, 2021 EX-99.1

Equillium Reports Third Quarter 2021 Financial Results and Provides Clinical Development Updates Announced plans to initiate a pivotal study of itolizumab in first-line treatment of acute graft-versus-host disease Reported decrease in proteinuria obs

Exhibit 99.1 Equillium Reports Third Quarter 2021 Financial Results and Provides Clinical Development Updates Announced plans to initiate a pivotal study of itolizumab in first-line treatment of acute graft-versus-host disease Reported decrease in proteinuria observed in subgroup of patients with lupus following two doses of itolizumab Reported interim safety data from first cohort of asthma patie

November 10, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 10, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File

August 10, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM,

August 10, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): August 10, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Nu

August 10, 2021 EX-99.1

Equillium Reports Second Quarter 2021 Financial Results and Provides Clinical Development Update Announced positive topline results from the EQUATE study of itolizumab in first-line treatment of acute graft-versus-host disease Announced plans to init

Exhibit 99.1 Equillium Reports Second Quarter 2021 Financial Results and Provides Clinical Development Update Announced positive topline results from the EQUATE study of itolizumab in first-line treatment of acute graft-versus-host disease Announced plans to initiate a Phase 3 pivotal study of itolizumab in first-line treatment of acute graft-versus-host disease LA JOLLA, California, August 10, 20

July 12, 2021 EX-99.1

Equillium Announces Plans to Initiate Phase 3 Pivotal Study of Itolizumab in First-line Treatment of Acute Graft-Versus-Host Disease Following End-of-Phase 1 Meeting with the FDA Single pivotal Phase 3 study in acute graft-versus-host disease to supp

Exhibit 99.1 Equillium Announces Plans to Initiate Phase 3 Pivotal Study of Itolizumab in First-line Treatment of Acute Graft-Versus-Host Disease Following End-of-Phase 1 Meeting with the FDA Single pivotal Phase 3 study in acute graft-versus-host disease to support filing of biologics license application On track to initiate study in Q4 2021 LA JOLLA, California, July 12, 2021 - Equillium, Inc. (

July 12, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 12, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

June 14, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 09, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

June 11, 2021 EX-99.1

Equillium Announces Positive Topline Results from the EQUATE Study in First-line Treatment of Acute Graft-Versus-Host Disease Itolizumab continues to demonstrate favorable safety and efficacy profile Rapid and durable responses resulted in clinically

Exhibit 99.1 Equillium Announces Positive Topline Results from the EQUATE Study in First-line Treatment of Acute Graft-Versus-Host Disease Itolizumab continues to demonstrate favorable safety and efficacy profile Rapid and durable responses resulted in clinically meaningful reduction in corticosteroid use Data support clinical advancement of itolizumab in first-line treatment of aGVHD Conference c

June 11, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 11, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

June 10, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 10, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

June 10, 2021 EX-99.1

Equillium Presents Data on Target Engagement and Modulation of CD6 on T Cells with Itolizumab at the International Society for Advancement of Cytometry Whole blood and proteomic stabilized blood assay used to elicit clinical pharmacodynamic CD6 bioma

EX-99.1 2 eq-20210610ex991.htm EX-99.1 Exhibit 99.1 Equillium Presents Data on Target Engagement and Modulation of CD6 on T Cells with Itolizumab at the International Society for Advancement of Cytometry Whole blood and proteomic stabilized blood assay used to elicit clinical pharmacodynamic CD6 biomarker in autoimmune diseases LA JOLLA, California, June 10, 2021 – Equillium, Inc. (Nasdaq: EQ), a

June 7, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 07, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numb

June 7, 2021 EX-99.1

Equillium to Collaborate with Oxford University and Kennedy Institute of Rheumatology to Investigate Role of the CD6-ALCAM Pathway and Itolizumab in Rheumatic Diseases

Exhibit 99.1 Equillium to Collaborate with Oxford University and Kennedy Institute of Rheumatology to Investigate Role of the CD6-ALCAM Pathway and Itolizumab in Rheumatic Diseases LA JOLLA, California, June 7, 2021 ? Equillium, Inc. (Nasdaq: EQ) a clinical-stage biotechnology company developing itolizumab to treat severe autoimmune and inflammatory disorders, today announced a translational resea

May 28, 2021 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 26, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

May 13, 2021 EX-10.3

Fourth Amendment to Collaboration and License Agreement by and between Registrant and Biocon Limited, dated April 14, 2021, incorporated by referenced to Exhibit 10.3 of the Registrant’s Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on May 13, 2021.

Exhibit 10.3 FOURTH AMENDMENT TO COLLABORATION AND LICENSE AGREEMENT THIS FOURTH AMENDMENT TO COLLABORATION AND LICENSE AGREEMENT ("Amendment") is made and entered into effective as of April 14, 2021 (the "Amendment Date"), by and between EQUILLIUM, INC., a corporation organized under the laws of the State of Delaware, USA, with its principal office at 2223 Avenida de la Playa, Suite 108, La Jolla

May 13, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUILLIUM

May 13, 2021 EX-10.4

Second Amendment to Loan and Security Agreement by and between Registrant and Oxford Finance LLC, dated April 23, 2021, incorporated by reference to Exhibit 10.4 of the Registrant's Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on May 13, 2021.

Exhibit 10.4 SECOND AMENDMENT TO LOAN AND SECURITY AGREEMENT THIS SECOND AMENDMENT to Loan and Security Agreement (this ?Amendment?) is entered into as of April 23, 2021 (the ?Amendment Date?), by and among OXFORD FINANCE LLC, a Delaware limited liability company with an office located at 115 South Union Street, Suite 300, Alexandria, VA 22314 (?Oxford?), as collateral agent (in such capacity, ?Co

May 13, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 13, 2021 Equillium, Inc. (Exact name of Registrant as Specified in Its Charter) Delaware 001-38692 82-1554746 (State or Other Jurisdiction of Incorporation) (Commission File Numbe

May 13, 2021 EX-99.1

Equillium Reports First Quarter 2021 Financial Results and Provides Clinical Development Update Announced favorable data from Phase 1b EQUALISE study in patients with systemic lupus erythematosus Cash runway into the second half of 2023 Multiple data

Exhibit 99.1 Equillium Reports First Quarter 2021 Financial Results and Provides Clinical Development Update Announced favorable data from Phase 1b EQUALISE study in patients with systemic lupus erythematosus Cash runway into the second half of 2023 Multiple data and regulatory catalysts through the remainder of 2021 LA JOLLA, California, May 13, 2021 - Equillium, Inc. (Nasdaq: EQ), a clinical-sta

April 9, 2021 DEF 14A

- DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)

April 9, 2021 DEFA14A

- DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)

March 30, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 30, 2021 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Num

March 30, 2021 EX-99.1

Equillium Announces Favorable Data From Phase 1b EQUALISE Study in Systemic Lupus Erythematosus Patients Itolizumab administered subcutaneously was safe and well tolerated in patients with systemic lupus erythematosus Dose-dependent changes in pharma

Exhibit 99.1 Equillium Announces Favorable Data From Phase 1b EQUALISE Study in Systemic Lupus Erythematosus Patients Itolizumab administered subcutaneously was safe and well tolerated in patients with systemic lupus erythematosus Dose-dependent changes in pharmacodynamic markers observed with subcutaneous dosing were consistent with intravenous dosing of itolizumab LA JOLLA, California, March 30,

March 24, 2021 EX-99.1

Equillium Reports Fourth Quarter and Full Year 2020 Financial Results and Provides Clinical Development Update Cash runway into the second half of 2023 Announced positive interim data from EQUATE study in aGVHD Multiple data and regulatory catalysts

Exhibit 99.1 Equillium Reports Fourth Quarter and Full Year 2020 Financial Results and Provides Clinical Development Update Cash runway into the second half of 2023 Announced positive interim data from EQUATE study in aGVHD Multiple data and regulatory catalysts in 2021 LA JOLLA, California, March 24, 2021 - Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company developing itolizumab

March 24, 2021 S-8

- 2021 S-8 (EVERGREEN)

As filed with the Securities and Exchange Commission on March 24, 2021 Registration No.

March 24, 2021 EX-10.28

Amended and Restated Offer Letter, effective January 26, 2021, by and between the Registrant and Joel Rothman, incorporated by reference to Exhibit 10.28 of the Registrant’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on March 24, 2021.

Exhibit 10.28 Equillium, Inc. Original Offer Letter Date: August 31, 2018 First Amendment to Offer Letter Effective: January 1, 2020 Amended and Restated Effective: January 26, 2021 Joel Rothman PO Box 326 Moss Beach, CA 94038 Re:Amended and Restated Employment Terms Dear Joel: Equillium, Inc. (the ?Company?) is pleased to offer you the position of Chief Development Officer on the following terms.

March 24, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) March 24, 2021 Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Numb

March 24, 2021 EX-10.29

Equillium, Inc. Non-Employee Director Compensation Policy, as amended.

Exhibit 10.29 Equillium, Inc. Non-Employee Director Compensation Policy (amended and restated, effective as of March 4, 2021) Each member of the Board of Directors (the ?Board?) who is not also serving as an employee of or consultant to Equillium, Inc. (the ?Company?) or any of its subsidiaries (each such member, an ?Eligible Director?) will receive the compensation described in this Non-Employee

March 24, 2021 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission File Number 001-38692 EQUILLIUM, INC.

March 15, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 15, 2021 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Num

March 15, 2021 EX-99.1

Equillium Announces Positive Data for Itolizumab in Acute Graft-Versus-Host Disease in Two Presentations at the 47th Annual Meeting of the European Society for Blood and Marrow Transplantation EQUATE acute graft-versus host disease (aGVHD) study obse

Exhibit 99.1 Equillium Announces Positive Data for Itolizumab in Acute Graft-Versus-Host Disease in Two Presentations at the 47th Annual Meeting of the European Society for Blood and Marrow Transplantation EQUATE acute graft-versus host disease (aGVHD) study observed rapid response and durability through day 85 EQUATE aGVHD study reported a clinically meaningful reduction in corticosteroid use Tra

March 9, 2021 EX-99.1

Safe Harbor Statement This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,” “objective,” “believe,” “es

Harnessing Novel Immunobiology March 2021 www.equilliumbio.com Exhibit 99.1 Safe Harbor Statement This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,” “objective,” “believe,” “estimate,” “potential,” “continue” and “ongoing,” or the negative of these t

March 9, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): March 9, 2021 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Numb

February 16, 2021 SC 13D

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Equillium, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No.

February 12, 2021 EX-99.2

Equillium Presents Positive Interim Clinical Data of Itolizumab in First-line Treatment of Acute Graft-Versus-Host Disease at the 2021 Transplantation and Cellular Therapy Meetings Digital Experience Higher dose cohorts demonstrated 100% overall resp

EXHIBIT 99.2 Equillium Presents Positive Interim Clinical Data of Itolizumab in First-line Treatment of Acute Graft-Versus-Host Disease at the 2021 Transplantation and Cellular Therapy Meetings Digital Experience Higher dose cohorts demonstrated 100% overall response rate, resulting in substantial reduction in baseline corticosteroid use Dose-dependent reduction of CD6 expression on CD4+ and CD8+

February 12, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 February 12, 2021 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File N

February 12, 2021 EX-99.1

Research Support: BMS, Miltenyi, Clinigen, Amgen, Regeneron Advisory Board: Therakos, Cugene, Regeneron Consulting: EMD Serono/Merck, Biolojic Design, Gentibio, Moderna Therapeutics, Equillium, Inc Investigational use of Itolizumab (EQ001) for aGVHD

Exhibit 99.1 John Koreth, Alison W. Loren, Ryotaro Nakamura, Marco Mielcarek, Trent Wang, George L. Chen, Sarah Anand, Joseph A. Pidala, Edmund K. Waller, Gabrielle Meyers, Daanish Hoda, Mark Schroeder, Jeremy Pantin, Nosha Farhadfar, Cherie Ng, Lisette M. Acevedo, Maple Fung, Joel Rothman, Stephen Connelly, Krishna R. Polu, Corey Cutler Interim results from the EQUATE Study: Preliminary safety an

February 4, 2021 EX-10.1

Purchase Agreement between the Company and the Purchasers, dated February 3, 2021, incorporated by reference to Exhibit 10.1 of the Registrant's Current Report on Form 8-K, filed with the Securities and Exchange Commission on February 4, 2021.

EXHIBIT 10.1 SECURITIES PURCHASE AGREEMENT THIS SECURITIES PURCHASE AGREEMENT (the “Agreement”) is made as of the 3rd day of February, 2021, by and among Equillium, Inc., a Delaware corporation (the “Company”), and the investors set forth on the signature pages hereto (the “Investors”). THE PARTIES HEREBY AGREE AS FOLLOWS: 1. Purchase and Sale of Securities. 1.1Sale and Issuance. Subject to the te

February 4, 2021 EX-99.1

Equillium Announces Pricing of $30 Million Registered Direct Offering

EXHIBIT 99.1 Equillium Announces Pricing of $30 Million Registered Direct Offering LA JOLLA, Calif., February 4, 2021 – Equillium, Inc. (Nasdaq: EQ) a clinical-stage biotechnology company developing itolizumab to treat severe autoimmune and inflammatory disorders, today announced that it has entered into a securities purchase agreement with life science institutional investment funds managed by De

February 4, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 February 3, 2021 Date of Report (Date of earliest event reported) Equillium, Inc. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission File Nu

February 4, 2021 EX-4.1

Form of Warrant, issued February 5, 2021, incorporated by reference to Exhibit 4.1 of the Registrant’s Current Report on Form 8-K, filed with the Securities and Exchange Commission on February 4, 2021.

EXHIBIT 4.1 EQUILLIUM, INC. WARRANT TO PURCHASE COMMON STOCK Warrant No. 2021- Original Issue Date: February 5, 2021 Equillium, Inc., a Delaware corporation (the “Company”), hereby certifies that, for value received, or its permitted registered assigns (the “Holder”), is entitled to purchase from the Company up to a total of shares of common stock, $0.0001 par value per share (the “Common Stock”),

February 4, 2021 424B5

4,285,710 Shares of Common Stock Warrants to Purchase 1,285,713 Shares of Common Stock

424B5 Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No. 333-234683 PROSPECTUS SUPPLEMENT (To Prospectus dated November 25, 2019) 4,285,710 Shares of Common Stock Warrants to Purchase 1,285,713 Shares of Common Stock We are offering 4,285,710 units (each a “Unit” and collectively, the “Units”), with each Unit consisting of one share of our common stock, par value $0.0001 per share

February 3, 2021 SC 13G/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. )* Equillium, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) (CUSIP Number) December 31,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 ( Amendment No. )* Equillium, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 29446K106 (CUSIP Number) December 31, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedul

December 21, 2020 EX-10.1

Offer Letter, dated December 15, 2020, by and between Equillium, Inc. and Dolca Thomas, M.D.

EX-10.1 Exhibit 10.1 Equillium, Inc. December 15, 2020 Dolca Thomas, M.D. 2207 Sweeney Lane Alameda, CA 94501 Re: Offer of Employment Dear Dolca: Equillium, Inc. (the “Company”) is pleased to offer you the position of Executive Vice President of Research & Development & Chief Medical Officer on the following terms. You will report to the Chief Executive Officer (“CEO”), Bruce Steel. Your main offi

December 21, 2020 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): December 15, 2020 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission F

December 21, 2020 EX-99.1

Equillium Appoints Industry Veteran, Dolca Thomas, M.D. as Executive Vice President of Research & Development and Chief Medical Officer Equillium Further Strengthens Management Team with Additional Executive Hires

EX-99.1 Exhibit 99.1 Equillium Appoints Industry Veteran, Dolca Thomas, M.D. as Executive Vice President of Research & Development and Chief Medical Officer Equillium Further Strengthens Management Team with Additional Executive Hires LA JOLLA, Calif., Dec. 21, 2020 – Equillium, Inc. (Nasdaq: EQ) a clinical-stage biotechnology company developing itolizumab to treat severe autoimmune and inflammato

December 7, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits - 8-K

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): December 7, 2020 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission Fi

December 7, 2020 EX-99.1

Equillium Presents Translational Data Demonstrating Impact of Itolizumab on Effector T Cell Function at the 2020 American Society of Hematology Annual Meeting and Exposition Studies further support itolizumab’s potential as treatment for aGVHD patien

EX-99.1 Exhibit 99.1 Equillium Presents Translational Data Demonstrating Impact of Itolizumab on Effector T Cell Function at the 2020 American Society of Hematology Annual Meeting and Exposition Studies further support itolizumab’s potential as treatment for aGVHD patients LA JOLLA, Calif., Dec. 7, 2020 – Equillium, Inc. (Nasdaq: EQ) a clinical-stage biotechnology company developing itolizumab to

December 4, 2020 EX-99.1

Safe Harbor Statement This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,” “objective,” “believe,” “es

EX-99.1 Virtual Investor / Analyst Day December 4, 2020 www.equilliumbio.com Exhibit 99.1 Safe Harbor Statement This presentation contains forward-looking statements about Equillium, Inc. (the “Company”). In some cases, you can identify forward-looking statements by the words “will,” “expect,” “intend,” “plan,” “objective,” “believe,” “estimate,” “potential,” “continue”, “target”, “predict”, and “

December 4, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits - 8-K

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): December 4, 2020 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission Fi

November 30, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits - 8-K

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): November 30, 2020 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission F

November 30, 2020 EX-99.1

Equillium to Host Virtual Investor and Analyst Day on December 4, 2020 Review positive interim data from the study of itolizumab for the treatment of acute GVHD and pipeline programs in lupus / lupus nephritis and uncontrolled asthma Featured guest s

EX-99.1 Exhibit 99.1 Equillium to Host Virtual Investor and Analyst Day on December 4, 2020 Review positive interim data from the study of itolizumab for the treatment of acute GVHD and pipeline programs in lupus / lupus nephritis and uncontrolled asthma Featured guest speaker: John Koreth, M.D., D.Phil. of Dana-Farber Cancer Institute LA JOLLA, Calif, November 30, 2020 — Equillium, Inc. (Nasdaq:

November 25, 2020 EX-99.1

Equillium Provides Itolizumab COVID-19 Program Update Analyst Day scheduled for December 4, 2020

EX-99.1 Exhibit 99.1 Equillium Provides Itolizumab COVID-19 Program Update Analyst Day scheduled for December 4, 2020 LA JOLLA, Calif., Nov 25, 2020 - Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company developing itolizumab to treat severe autoimmune and inflammatory disorders, today announced that due to the rapidly evolving COVID-19 treatment landscape, the company will not ini

November 25, 2020 8-K

Regulation FD Disclosure, Financial Statements and Exhibits - 8-K

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): November 25, 2020 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission F

November 10, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - 8-K

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): November 10, 2020 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission F

November 10, 2020 EX-99.1

Equillium Reports Third Quarter 2020 Financial Results and Business Highlights

EX-99.1 Exhibit 99.1 Equillium Reports Third Quarter 2020 Financial Results and Business Highlights LA JOLLA, Calif., Nov 10, 2020 — Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company developing itolizumab to treat severe autoimmune and inflammatory disorders, today announced financial results for the third quarter 2020. “We continue to make significant progress towards our goal

November 10, 2020 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38692 EQUIL

October 29, 2020 8-K

Financial Statements and Exhibits, Other Events - FORM 8-K

Form 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): October 29, 2020 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commissi

October 29, 2020 EX-99.1

Equillium Receives FDA Clearance of COVID-19 IND for Phase 3 Trial Equillium plans to initiate global Phase 3 COVID-19 trial – EQUINOX – during Q4 2020 FDA indicates study could support BLA filing

EX-99.1 Exhibit 99.1 Equillium Receives FDA Clearance of COVID-19 IND for Phase 3 Trial Equillium plans to initiate global Phase 3 COVID-19 trial – EQUINOX – during Q4 2020 FDA indicates study could support BLA filing LA JOLLA, Calif., Oct. 29, 2020 – Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company developing itolizumab to treat severe autoimmune and inflammatory disorders, to

September 28, 2020 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits - 8-K

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (date of earliest event reported): September 22, 2020 EQUILLIUM, INC. (Exact name of registrant as specified in its charter) Delaware 001-38692 82-1554746 (State or other jurisdiction of incorporation) (Commission

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