PRIM / Primoris Services Corporation - Pemfailan SEC, Laporan Tahunan, Penyata Proksi

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

Table of Contents 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

Primoris Services Corporation Reports Second Quarter 2025 Results

Exhibit 99.1 Primoris Services Corporation Reports Second Quarter 2025 Results Dallas, TX – August 4, 2025 – Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its second quarter ended June 30, 2025 and provided comments on the Company’s operational performance and outlook for the remainder of 2025. For the second quarter of 2025, Primori

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 30, 2025 Date of Report (Date of earliest event reported) Primoris Services Co

19 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 30, 2025 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number

Moss Adams’ Commission Letter dated June 3, 2025

Exhibit 16.1 June 3, 2025 U.S. Securities and Exchange Commission 100 F Street, NE Washington, DC 20549 Ladies and Gentlemen: We have read the statements made by Primoris Services Corporation included under Item 4.01 of its Current Report on Form 8-K dated June 3, 2025, to be filed with the Securities and Exchange Commission. We agree with the statements concerning our Firm contained therein. Sinc

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 June 3, 2025 Date of Report (Date of earliest event reported) Primoris Services Cor

19 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 June 3, 2025 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

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

Table of Contents 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 numbe

Primoris Services Corporation Reports First Quarter 2025 Results

Exhibit 99.1 Primoris Services Corporation Reports First Quarter 2025 Results Dallas, TX – May 5, 2025 – Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its first quarter ended March 31, 2025 and provided comments on the Company’s operational performance and outlook for 2025. For the first quarter of 2025, Primoris reported the followi

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 30, 2025 Date of Report (Date of earliest event reported) Primoris Services C

19 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 30, 2025 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numbe

Offer Letter dated March 21, 2025, by and between Primoris Services Corporation and David King

Exhibit 10.1 March 21, 2025 David King (via email) Dear David: On behalf of Primoris Services Corporation, referred to as the "Company”, I am pleased to offer you the position of Interim President & Chief Executive Officer, effective as of March 21, 2025 (the “Start Date”), while we search for a permanent President & CEO. The intention of this letter is to outline the terms and conditions of the r

Offer Letter dated March 21, 2025, by and between Primoris Services Corporation and Jeremy Kinch

Exhibit 10.2 March 21, 2025 Jeremy Kinch Dear Jeremy: We are pleased to provide the following terms for your promotion to Executive Vice President and Chief Operating Officer with Primoris Services Corporation, (the “Company” and “Employer”). The intention of this letter is to complement your Employment Agreement which will outline additional terms and details. 1. Position: Executive Vice Presiden

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

19 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 21, 2025 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numbe

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

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

19 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 14, 2025 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numbe

Tom McCormick Separation and Release of Claims Agreement dated March 19, 2025

Exhibit 10.1 SEPARATION AND RELEASE OF CLAIMS AGREEMENT This Separation and Release of Claims Agreement (this “Agreement”) is made as of the Agreement Effective Date (as defined as defined in Section 11 below) by and between Primoris Services Corporation (the “Company”) and Thomas McCormick (“Executive”) (together, the “Parties”). WHEREAS, the Company and Executive are parties to an Amended and Re

Primoris Services Corporation Announces Leadership Changes

Exhibit 99.1 Primoris Services Corporation Announces Leadership Changes Dallas, TX – March 14, 2025 – Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced that David King, Chairman and our prior Chief Executive Officer, has been named Interim President and Chief Executive Officer. David will succeed Tom McCormick, who will be separating from the Company effectiv

Subsidiaries and equity investments of Primoris Services Corporation (*)

Exhibit 21.1 Subsidiaries and Equity Investments of the Registrant Subsidiary Jurisdiction of Organization ARB, Inc. California ARB Chile, Ltda. Chile B Comm Constructors, LLC Texas Cardinal Contractors, Inc. Florida Edison Power Constructors, Inc. Arizona Future Infrastructure, LLC Texas James Construction Group, LLC Texas OnQuest, Inc. California OnQuest Canada, ULC (formerly Born Heaters Canada

Insider Trading Policy (*)

Exhibit 19.1 Insider Trading Policy 1. Purpose Since Primoris Services Corporation (the “Company”) is a publicly traded company, restrictions under both state and federal law apply to the purchase and sale of the Company’s common stock by any director, officer, or employee of the Company (collectively referred to as “Insiders”). 2. Policy The Chief Financial Officer and General Counsel, with the a

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

Table of Contents 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: 001-34

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 19, 2025 Date of Report (Date of earliest event reported) Primoris Service

19 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 19, 2025 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Nu

Primoris Services Corporation Reports Fourth Quarter and Full Year 2024 Results

Exhibit 99.1 Primoris Services Corporation Reports Fourth Quarter and Full Year 2024 Results Dallas, TX – Feb. 24, 2025 – Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its fourth quarter and full year ended December 31, 2024, and provided the Company’s initial outlook for 2025. For the full year 2024, Primoris reported the following

Primoris Services Corporation Promotes Jeremy Kinch to Chief Operations Support Officer

Exhibit 99.1 Primoris Services Corporation Promotes Jeremy Kinch to Chief Operations Support Officer Dallas, TX – January 7, 2025 – Primoris Services Corporation (NYSE: PRIM) (“Primoris” or “the Company”), a premier specialty contractor providing critical infrastructure services, announced today that Jeremy Kinch, previously President of Energy, has been promoted to Chief Operations Support Office

Amended and Restated Employment Agreement dated January 7, 2025, by and among Primoris Services Corporation and Jeremy Kinch

Exhibit 10.1 AMENDED AND RESTATED EMPLOYMENT AGREEMENT BETWEEN Primoris Services Corporation AND Jeremy Kinch AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this “Agreement”) is made and entered into as of January 7, 2025, (the “Effective Date”), by and between Primoris Services Corporation, a Delaware corporation (the “Employer”), and Jeremy Kinch (the “

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

19 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 January 7, 2025 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numb

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

Table of Contents 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 n

Primoris Services Corporation Reports Third Quarter 2024 Results

Exhibit 99.1 Primoris Services Corporation Reports Third Quarter 2024 Results Dallas, TX – November 4, 2024– Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its third quarter ended September 30, 2024 and provided comments on the Company’s operational performance and outlook for 2024. For the third quarter of 2024, Primoris reported the

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

19 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) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Num

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

Table of Contents 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

Primoris Services Corporation Reports Second Quarter 2024 Results

Exhibit 99.1 Primoris Services Corporation Reports Second Quarter 2024 Results Dallas, TX – August 5, 2024– Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its second quarter ended June 30, 2024 and provided comments on the Company’s operational performance and outlook for 2024. For the second quarter of 2024, Primoris reported the fol

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

19 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 31, 2024 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number

PRIM / Primoris Services Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: Primoris Services Corp Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: June 28, 2024 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒

As filed with the Securities and Exchange Commission on May 9, 2024

TABLE OF CONTENTS As filed with the Securities and Exchange Commission on May 9, 2024 Registration No.

Primoris Services Corporation Reports First Quarter 2024 Results

Exhibit 99.1 Primoris Services Corporation Reports First Quarter 2024 Results Dallas, TX – May 8, 2024– Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its first quarter ended March 31, 2024 and provided comments on the Company’s operational performance and outlook for 2024. For the first quarter of 2024, Primoris reported the followin

Financial Statements and Exhibits, Results of Operations and Financial Condition, Submission of Matters to a Vote of Security Holders

19 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 8, 2024 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number

Calculation of Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-3 (Form Type) Primoris Services Corporation (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Filing Fee Previously Paid in Connection Fee with Proposed Carry Unsold Calculation Maximum Maximum Carry Carry Forward Securities Security or Carry Offering Aggregate Amount of Forward Forward

1

May 9, 2024 Office of Real Estate and Construction Division of Corporation Finance United States Securities and Exchange Commission 100 F Street, NE Washington, D.

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 May 8, 2024 Date of Report (Date of earliest event reported) Primoris Services Corp

19 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 May 8, 2024 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

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

Table of Contents 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 numbe

Primoris Services Corporation Reports First Quarter 2024 Results

Exhibit 99.1 Primoris Services Corporation Reports First Quarter 2024 Results Dallas, TX – May 8, 2024– Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its first quarter ended March 31, 2024 and provided comments on the Company’s operational performance and outlook for 2024. For the first quarter of 2024, Primoris reported the followin

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

19 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 May 1, 2024 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

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

Dodd-Frank Compensation Recovery Policy (*)

Exhibit 97 Primoris Services Corporation Dodd-Frank Compensation Recovery Policy This Compensation Recovery Policy (this “Policy”) is adopted by Primoris Services Corporation (the “Company”) in accordance with Section 303A.

Subsidiaries and equity investments of Primoris Services Corporation (*)

Exhibit 21.1 Subsidiaries and Equity Investments of the Registrant Subsidiary Jurisdiction of Organization ARB, Inc. California ARB Chile, Ltda. Chile B Comm Constructors, LLC Texas Cardinal Contractors, Inc. Florida Comtrac Services, LLC Delaware Edison Power Constructors, Inc. Arizona Future Infrastructure Holdings, LLC Delaware Future Infrastructure, LLC Texas Future Telecom Purchaser, LLC Dela

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

Table of Contents 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: 001-34

Primoris Services Corporation Reports Fourth Quarter and Full Year 2023 Results

Exhibit 99.1 Primoris Services Corporation Reports Fourth Quarter and Full Year 2023 Results Dallas, TX – Feb. 26, 2024 – Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its fourth quarter and full year ended December 31, 2023 and provided the Company’s initial outlook for 2024. For the full year 2023, Primoris reported the following h

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

19 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 21, 2024 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Nu

PRIM / Primoris Services Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01735-primorisservicescorp.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: Primoris Services Corp Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to

PRIM / Primoris Services Corporation / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Primoris Services Corp (Name of Issuer) Common Stock (Title of Class of Securities) 74164F103 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

PRIM / Primoris Services Corporation / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3 )* Primoris Services Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 74164F103 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropri

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

Table of Contents 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 n

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

19 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 November 2, 2023 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Num

Primoris Services Corporation Reports Third Quarter 2023 Results

Exhibit 99.1 Primoris Services Corporation Reports Third Quarter 2023 Results Dallas, TX – November 7, 2023– Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its third quarter ended September 30, 2023 and provided comments on the Company’s operational performance and outlook for 2023. For the third quarter of 2023, Primoris reported the

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

Table of Contents 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

Primoris Services Corporation Reports Second Quarter 2023 Results

Exhibit 99.1 Primoris Services Corporation Reports Second Quarter 2023 Results Dallas, TX – August 7, 2023– Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its second quarter ended June 30, 2023 and provided comments on the Company’s operational performance and outlook for 2023. For the second quarter of 2023, Primoris reported the fol

Financial Statements and Exhibits, Results of Operations and Financial Condition, Completion of Acquisition or Disposition of Assets, Other Events

19 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 August 2, 2023 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Num

Primoris Services Corporation Reports Second Quarter 2023 Results

Exhibit 99.1 Primoris Services Corporation Reports Second Quarter 2023 Results Dallas, TX – August 7, 2023– Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its second quarter ended June 30, 2023 and provided comments on the Company’s operational performance and outlook for 2023. For the second quarter of 2023, Primoris reported the fol

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 August 2, 2023 Date of Report (Date of earliest event reported) Primoris Services C

19 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 August 2, 2023 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numbe

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 May 22, 2023 Date of Report (Date of earliest event reported) Primoris Services Cor

19 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 May 22, 2023 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

John F. Moreno, Jr. Separation Agreement (incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K, as filed with the SEC on May 26, 2023).

Exhibit 10.1 MUTUAL AGREEMENT OF SEPARATION AND GENERAL RELEASE This Mutual Agreement of Separation and General Release (the “Agreement”) is entered into by and between Primoris Services Corporation (referred to throughout this Agreement as “Employer”) and John F. Moreno, Jr. (“Employee”). The term “Party” or “Parties” as used herein shall refer to Employer, Employee, or both, as may be appropriat

As filed with the Securities and Exchange Commission on May 10, 2023

As filed with the Securities and Exchange Commission on May 10, 2023 Registration No.

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-8 (Form Type) Primoris Services Corporation (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.

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

Table of Contents 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 numbe

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 May 3, 2023 Date of Report (Date of earliest event reported) Primoris Services Corp

19 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 May 3, 2023 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

Primoris Services Corporation Reports First Quarter 2023 Results

Exhibit 99.1 Primoris Services Corporation Reports First Quarter 2023 Results Dallas, TX – May 9, 2023– Primoris Services Corporation (NYSE: PRIM) (“Primoris” or the “Company”) today announced financial results for its first quarter ended March 31, 2023 and provided comments on the Company’s operational performance and outlook for 2023. For the first quarter of 2023, Primoris reported the followin

2023 Equity Incentive Plan (incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K, as filed with the SEC on May 9, 2023).

Exhibit 10.1 Primoris Services Corporation 2023 Equity Incentive Plan 1.ESTABLISHMENT, PURPOSE AND TERM OF PLAN. 1.1Establishment. The Primoris Services Corporation 2023 Equity Incentive Plan (the “Plan”) is effective as of May 3rd, 2023, the date of its approval by the stockholders of the Company (the “Effective Date”). Following the Effective Date: (i) no additional awards may be granted under t

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 25 NOTIFICATION OF REMOVAL FROM LISTING AND/OR REGISTRATION UNDER SECTION 12(b) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number 001-34145 Primoris Services Co

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 25 NOTIFICATION OF REMOVAL FROM LISTING AND/OR REGISTRATION UNDER SECTION 12(b) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File Number 001-34145 Primoris Services Corporation The Nasdaq Stock Market LLC (Exact name of Issuer as specified in its charter, and name of Exchange where security is listed and/or register

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 24, 2023 Date of Report (Date of earliest event reported) Primoris Services C

19 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 24, 2023 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numbe

Primoris Services Corporation Announces Transfer of Listing of Common Stock to the New York Stock Exchange

PRESS RELEASE Primoris Services Corporation Announces Transfer of Listing of Common Stock to the New York Stock Exchange Dallas, TX – March 24, 2023 – Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or the “Company”) announced today that it will transfer the listing of its common stock from The Nasdaq Stock Market LLC (“Nasdaq”) to the New York Stock Exchange (“NYSE”).

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

Form 8-A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 Primoris Services Corporation (Exact name of registrant as specified in its charter) Delaware 20-4743916 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identificati

Subsidiaries and equity investments of Primoris Services Corporation (*)

Exhibit 21.1 Subsidiaries and Equity Investments of the Registrant Subsidiary Jurisdiction of Organization ARB, Inc. California ARB Structures, Inc. California ARB Chile, Ltda. Chile Auger Services, Inc. Louisiana B Comm Constructors, LLC Texas Cardinal Contractors, Inc. Florida Comtrac Services, LLC Delaware Edison Power Constructors, Inc. Arizona Future Infrastructure Holdings, LLC Delaware Futu

Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934

Exhibit 4.2 Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 Primoris Services Corporation (“the Company”, “we”, “our”, or “us”) currently has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, (“the Exchange Act”) our common stock, par value $0.0001 per share. The following desc

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

Table of Contents 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: 001-34

Primoris Services Corporation Reports Fourth Quarter and Full Year 2022 Results

Exhibit 99.1 Primoris Services Corporation Reports Fourth Quarter and Full Year 2022 Results Dallas, TX – Feb. 27, 2023– Primoris Services Corporation (NASDAQ GS: PRIM) (“Primoris” or the “Company”) today announced financial results for its fourth quarter and full year ended December 31, 2022 and provided the Company’s initial outlook for 2023. For the full year 2022, Primoris reported the followi

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 22, 2023 Date of Report (Date of earliest event reported) Primoris Service

19 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 22, 2023 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Nu

PRIM / Primoris Services Corp / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Primoris Services Corp (Name of Issuer) Common Stock (Title of Class of Securities) 74164F103 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to

PRIM / Primoris Services Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01708-primorisservicescorp.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9)* Name of issuer: Primoris Services Corp. Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to

PRIM / Primoris Services Corp / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2 )* Primoris Services Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 74164F103 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

PRIM / Primoris Services Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8)* Name of issuer: Primoris Services Corp. Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: October 31, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule is filed

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

Table of Contents 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 n

Primoris Services Corporation Reports Third Quarter 2022 Results

? ? Exhibit 99.1 ? Primoris Services Corporation Reports Third Quarter 2022 Results ? Dallas, TX ? November 7, 2022? Primoris Services Corporation (NASDAQ GS: PRIM) (?Primoris? or the ?Company?) today announced financial results for its third quarter ended September 30, 2022 and confirmed the Company?s outlook. ? For the third quarter 2022, Primoris reported the following highlights(1): ? Revenue

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

? ? 19 ? 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 November 3, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (C

Page No.

Exhibit 99.1 ? ? PLH Group, Inc. and Subsidiaries Consolidated Financial Statements as of and for the Year Ended December 31, 2021 and Independent Auditor?s Report ? PLH Group, Inc. and Subsidiaries Table of Contents December 31, 2021 ? Page No. ? ? ? INDEPENDENT AUDITOR?S REPORT ? 1 ? ? ? CONSOLIDATED FINANCIAL STATEMENTS AS OF AND FOR THE YEAR ENDED DECEMBER 31, 2021: ? ? ? ? ? Consolidated Bala

UNAUDITED PRO FORMA CONSOLIDATED COMBINED FINANCIAL STATEMENTS

? ? Exhibit 99.3 ? UNAUDITED PRO FORMA CONSOLIDATED COMBINED FINANCIAL STATEMENTS ? Introduction ? On August 1, 2022, Primoris Services Corporation, a Delaware corporation (?Primoris?, ?we?, ?us?, ?our?), completed its previously announced acquisition of PLH Group, Inc. (?PLH?). Pursuant to the terms of that Agreement and Plan of Merger (the ?Merger Agreement?) dated as of June 27, 2022, Primoris

Page No.

Exhibit 99.2 ? ? PLH Group, Inc. and Subsidiaries Condensed Consolidated Financial Statements as of and for the Three Months Ended March 31, 2022 ? ? PLH Group, Inc. and Subsidiaries Table of Contents March 31, 2022 ? Page No. ? ? ? CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AS OF AND FOR THE THREE MONTHS ENDED MARCH 31, 2022 (UNAUDITED): ? ? ? ? ? Condensed Consolidated Balance Sheet ? 2 ? ? ? C

Financial Statements and Exhibits

19 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 August 1, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Num

Primoris Services Corporation Reports Second Quarter 2022 Results

? ? Exhibit 99.1 ? Primoris Services Corporation Reports Second Quarter 2022 Results ? Dallas, TX ? August 8, 2022? Primoris Services Corporation (NASDAQ GS: PRIM) (?Primoris? or the ?Company?) today announced financial results for its second quarter ended June 30, 2022 and provided the Company?s outlook for 2022. ? For the second quarter 2022, Primoris reported the following(1): ? Record revenue

Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Other Events

? ? 19 ? 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 August 3, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (Com

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

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Regulation FD Disclosure, Entry into a Material Definitive Agreement, 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

? ? 19 ? 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 August 1, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (Com

Primoris Services Corporation Completes PLH Group Acquisition

Exhibit 99.1 PRESS RELEASE Primoris Services Corporation Completes PLH Group Acquisition ? DALLAS, TX ? August 1, 2022 ? Primoris Services Corporation (NASDAQ Global Select: PRIM) (?Primoris? or ?Company?), a leading provider of specialty contracting services in North America, announced today that it has closed its acquisition of PLH Group, Inc. (?PLH Group? or ?PLH?) in an all-cash transaction va

Third Amended and Restated Credit Agreement by and among Primoris Services Corporation, CIBC Bank USA and the several other financial institutions party thereto. (incorporated by reference to Exhibit 10.1 to Primoris’ Current Report on Form 8-K filed on August 1, 2022)

Exhibit 10.1 ? ? THIRD AMENDED AND RESTATED CREDIT AGREEMENT dated as of August 1, 2022 Among PRIMORIS SERVICES CORPORATION as Borrower THE VARIOUS FINANCIAL INSTITUTIONS PARTY HERETO as Lenders and ? CIBC BANK USA as Agent, Joint Bookrunner, Joint Lead Arranger Collateral Agent and Issuing Lender ? Bank of the West as Joint Bookrunner, Joint Lead Arranger Co-Documentation Agent and Issuing Lender

Forward Looking Statements 1 This presentation contains forward - looking statements within the meaning of the federal securities laws. These statements give t he current expectations of the Company’s management. Words such as “could,” “will,” “may,”

Exhibit 99.2 Primoris to Acquire PLH Group Establishing a Leading Utilities Services Provider June 2022 Forward Looking Statements 1 This presentation contains forward - looking statements within the meaning of the federal securities laws. These statements give t he current expectations of the Company?s management. Words such as ?could,? ?will,? ?may,? ?assume,? ?forecast,? ?strategy,? ?guidance,?

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

? ? 19 ? 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 June 24, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (Comm

Agreement and Plan of Merger, dated June 24, 2022, among Primoris Services Corporation, PLH Group, Inc., Amp Merger Sub, Inc. and Shareholder Representative Services LLC, as Stockholder Representative. (incorporated by reference to Exhibit 2.1 to Primoris’ Current Report on Form 8-K filed on June 27, 2022)

AGREEMENT AND PLAN OF MERGER BY AND AMONG PLH GROUP, INC. AMP MERGER SUB, INC. PRIMORIS SERVICES CORPORATION AND SHAREHOLDER REPRESENTATIVE SERVICES LLC, as Stockholder Representative Dated as of June 24, 2022 ? ? 1 ? TABLE OF CONTENTS ? Article I Definitions 1 1.1 Certain Definitions 1 1.2 Terms Defined Elsewhere in this Agreement 16 1.3 Other Definitional and Interpretive Matters 19 Article II T

Primoris Services Corporation to Expand Utility Business through Acquisition of PLH Group, Inc.

Exhibit 99.1 PRESS RELEASE Primoris Services Corporation to Expand Utility Business through Acquisition of PLH Group, Inc. Dallas, Texas ? June 27, 2022 ? Primoris Services Corporation (NASDAQ Global Select: PRIM) (?Primoris? or the ?Company?) announced today that it has entered into a definitive merger agreement to acquire PLH Group, Inc. (?PLH Group? or ?PLH?) in an all-cash transaction valued a

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

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-8 (Form Type) Primoris Services Corporation (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.

As filed with the Securities and Exchange Commission on May 10, 2022

As filed with the Securities and Exchange Commission on May 10, 2022 Registration No.

2022 Primoris Services Corporation Employee Stock Purchase Plan (incorporated herein by reference to Exhibit 10.1 to the registrant’s Current Report on Form 8-K, as filed with the SEC on May 9, 2022)

2022 PRIMORIS SERVICES CORPORATION EMPLOYEE STOCK PURCHASE PLAN 1. Purpose The purpose of this 2022 Primoris Services Corporation Employee Stock Purchase Plan (the ?Plan?) is to provide employees of the Company and its Designated Subsidiaries with an opportunity to purchase Common Stock through one-time or accumulated Contributions. The Plan is not intended to qualify as an ?employee stock purchas

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events, Submission of Matters to a Vote of Security Holders

? ? 19 ? 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 May 4, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (Commis

Primoris Services Corporation Reports First Quarter 2022 Results

? ? Exhibit 99.1 ? Primoris Services Corporation Reports First Quarter 2022 Results ? Dallas, TX ? May 9, 2022? Primoris Services Corporation (NASDAQ GS: PRIM) (?Primoris? or the ?Company?) today announced financial results for its first quarter ended March 31, 2022 and provided the Company?s outlook for 2022. ? For the first quarter 2022, Primoris reported the following(1): ? Revenue of $784.4 mi

Employment Agreement dated April 1, 2022, by and between Primoris Services Corporation and John M. Perisich (incorporated by reference to Exhibit 10.4 to Primoris’ Current Report on Form 8-K filed on April 7, 2022)

Exhibit 10.4 AMENDED AND RESTATED EMPLOYMENT AGREEMENT BETWEEN Primoris Services Corporation AND John M. Perisich April 1, 2022 ? ? AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of April 1, 2022 (the ?Effective Date?) by and between Primoris Services Corporation, a Delaware corporation (the ?Employer?), and J

Employment Agreement dated April 1, 2022, by and between Primoris Services Corporation and

Exhibit 10.1 AMENDED AND RESTATED EMPLOYMENT AGREEMENT BETWEEN Primoris Services Corporation AND Thomas McCormick April 1, 2022 ? AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of April 1, 2022 (the ?Effective Date?), by and between Primoris Services Corporation, a Delaware corporation (the ?Employer?), and Th

Employment Agreement dated April 1, 2022, by and between Primoris Services Corporation and John F. Moreno, Jr. (incorporated by reference to Exhibit 10.2 to Primoris’ Current Report on Form 8-K filed on April 7, 2022)

Exhibit 10.2 ? AMENDED AND RESTATED EMPLOYMENT AGREEMENT BETWEEN Primoris Services Corporation AND John F. Moreno, Jr. April 1, 2022 ? ? AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of April 1, 2022 (the ?Effective Date?), by and between Primoris Services Corporation, a Delaware corporation (the ?Employer?),

Employment Agreement dated April 1, 2022, by and between Primoris Services Corporation and Ken M. Dodgen (incorporated by reference to Exhibit 10.3 to Primoris’ Current Report on Form 8-K filed on April 7, 2022)

Exhibit 10.3 AMENDED AND RESTATED EMPLOYMENT AGREEMENT BETWEEN Primoris Services Corporation AND Ken M. Dodgen April 1, 2022 ? AMENDED AND RESTATED EMPLOYMENT AGREEMENT THIS AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of April 1, 2022 (the ?Effective Date?), by and between Primoris Services Corporation, a Delaware corporation (the ?Employer?), and Ken M

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

? ? 19 ? 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 1, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (Comm

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 tm2130832-2def14a.htm DEF 14A 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 U

Results of Operations and Financial Condition

? ? 19 ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 February 24, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction

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

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

Description of Registrant’s Securities (incorporated by reference to Exhibit 4.2 to our Annual Report on Form 10-K, as filed with the SEC on March 1, 2022)

Exhibit 4.2 Description of the Registrant?s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 Primoris Services Corporation (?the Company?, ?we?, ?our?, or ?us?) currently has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, (?the Exchange Act?) our common stock, par value $0.0001 per share. The following desc

Subsidiaries and equity investments of Primoris Services Corporation (*)

Exhibit 21.1 ? Subsidiaries and Equity Investments of the Registrant ? ? ? ? Subsidiary Jurisdiction of Organization ? ? ? ARB, Inc. ? California ARB Structures, Inc. ? California ARB Chile, Ltda. ? Chile Cardinal Contractors, Inc. ? Florida Comtrac Services, LLC ? Delaware Future Infrastructure Holdings, LLC ? Delaware Future Infrastructure, LLC ? Texas Future Telecom Purchaser, LLC ? Delaware Ga

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

? ? 19 ? 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 24, 2022 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (

Primoris Services Corporation Reports Fourth Quarter and Full Year 2021 Results

? ? Exhibit 99 ? Primoris Services Corporation Reports Fourth Quarter and Full Year 2021 Results ? Dallas, TX ? Feb.

PRIM / Primoris Services Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 7)* Name of issuer: Primoris Services Corp. Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is file

PRIM / Primoris Services Corp / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Primoris Services Corp (Name of Issuer) Common Stock (Title of Class of Securities) 74164F103 (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

PRIM / Primoris Services Corp / WELLINGTON MANAGEMENT GROUP LLP - SEC SCHEDULE 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* Primoris Services Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 74164F103 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to whi

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

? ? 19 ? 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 15, 2021 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (

Amended and Restated Bylaws of Primoris Services Corporation, as amended December 15, 2021 (incorporated by reference to Exhibit 3.1 to our Current Report on Form 8-K, as filed with the SEC on December 21, 2021)

? ? Exhibit 3.1 ? AMENDED AND RESTATED BYLAWS OF PRIMORIS SERVICES CORPORATION a Delaware corporation ? PREAMBLE These bylaws are subject to, and governed by, the General Corporation Law of the State of Delaware (the ?Delaware General Corporation Law?) and the certificate of incorporation, as it may be amended from time to time, of PRIMORIS SERVICES CORPORATION, a Delaware corporation (the ?Corpor

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

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

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

? ? 19 ? 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 November 3, 2021 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (C

Primoris Services Corporation Reports Third Quarter 2021 Results

? ? Exhibit 99 ? Primoris Services Corporation Reports Third Quarter 2021 Results ? Dallas, TX ? Nov.

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

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Primoris Services Corporation Reports Second Quarter 2021 Results

? ? Exhibit 99.1 ? Primoris Services Corporation Reports Second Quarter 2021 Results ? Dallas, TX ? Aug. 3, 2021? Primoris Services Corporation (NASDAQ GS: PRIM) (?Primoris? or ?Company?) today announced financial results for its second quarter ended June 30, 2021 and updated the Company?s outlook. ? For the second quarter 2021, Primoris reported the following highlights: ? Revenue of $881.6 milli

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

? ? 19 ? 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 August 3, 2021 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (Com

PRIM / Primoris Services Corp / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: Primoris Services Corp. Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: June 30, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ?

Quarterly Report - 10-Q

Table of Contents ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Primoris Services Corporation Reports First Quarter 2021 Results

? ? Exhibit 99.1 ? Primoris Services Corporation Reports First Quarter 2021 Results ? Dallas, TX ? May 5, 2021? Primoris Services Corporation (NASDAQ GS: PRIM) (?Primoris? or ?Company?) today announced financial results for its first quarter ended March 31, 2021 and updated the Company?s outlook. ? For the first quarter 2021, Primoris reported the following highlights: ? Revenue of $818.3 million,

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events, Submission of Matters to a Vote of Security Holders

? ? 19 ? 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 May 4, 2021 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (Commis

- DEF 14A

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 permitte

Underwriting Agreement, dated March 17, 2021, among Primoris Services Corporation, Goldman Sachs & Co. LLC, Morgan Stanley & Co. LLC and UBS Securities LLC

Exhibit 1.1 EXECUTION VERSION Primoris Services Corporation 4,500,000 Shares of Common Stock Underwriting Agreement March 17, 2021 Goldman Sachs & Co. LLC, Morgan Stanley & Co. LLC, UBS Securities LLC As representatives (the ?Representatives?) of the several Underwriters named in Schedule I hereto, c/o Goldman Sachs & Co. LLC 200 West Street, New York, New York 10282 c/o Morgan Stanley & Co. LLC 1

Entry into a Material Definitive Agreement, 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 March 17, 2021 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as Specified in Its Charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

CALCULATION OF REGISTRATION FEE CHART Title of Securities to be Registered Amount to be Registered(1) Proposed Maximum Offering Price Per Share Proposed Maximume Aggregatee Offering Price Amount of Registration Fee(2) Common stock, par value $0.0001

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS 2 TABLE OF CONTENTS Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No.

Subject to completion, dated March 16, 2021

Use these links to rapidly review the document TABLE OF CONTENTS TABLE OF CONTENTS 2 TABLE OF CONTENTS Table of Contents Filed Pursuant to Rule 424(b)(5) Registration No.

Future Infrastructure Holdings, LLC and Subsidiaries NOTES TO CONSOLIDATED FINANCIAL STATEMENTS December 31, 2020 and 2019

Exhibit 99.1 Consolidated Financial Statements and Report of Independent Certified Public Accountants Future Infrastructure Holdings, LLC and Subsidiaries December 31, 2020 and 2019 Contents Page Report of Independent Certified Public Accountants 3 Consolidated Financial Statements Consolidated balance sheets 5 Consolidated statements of income 6 Consolidated statements of changes in members? equi

Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 11, 2021 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numb

UNAUDITED PRO FORMA CONSOLIDATED COMBINED FINANCIAL STATEMENTS

Exhibit 99.2 UNAUDITED PRO FORMA CONSOLIDATED COMBINED FINANCIAL STATEMENTS Introduction On January 15, 2021, Primoris Services Corporation, a Delaware corporation (?Primoris?, ?we?, ?us?, ?our?), completed its previously announced acquisition of Future Infrastructure Holdings, LLC, a Delaware limited liability company (?FIH?). Pursuant to the terms of that Agreement and Plan of Merger (the ?Merge

Subsidiaries and equity investments of Primoris Services Corporation (*)

Exhibit 21.1 ? Subsidiaries and Equity Investments of the Registrant ? ? ? ? Subsidiary Jurisdiction of Organization ? ? ? ARB, Inc. ? California ARB Structures, Inc. ? California ARB Chile, Ltda. ? Chile Cardinal Contractors, Inc. ? Florida James Construction Group, LLC ? Florida Juniper Rock Corporation ? California OnQuest, Inc. ? California OnQuest Canada, ULC (formerly Born Heaters Canada) ?

Annual Report - 10-K

Table of Contents ? ? UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.

Primoris Services Corporation Reports Fourth Quarter and Full Year 2020 Results

Exhibit 99.1 Primoris Services Corporation Reports Fourth Quarter and Full Year 2020 Results Dallas, TX – Feb. 22, 2021– Primoris Services Corporation (NASDAQ GS: PRIM) (“Primoris” or “Company”) today reported financial results for the fourth quarter and full year of 2020 and provided the Company’s financial outlook. For the full year 2020, Primoris reported the following highlights: ● Record reve

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

? ? 19 ? 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 19, 2021 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) ? ? ? ? ? ? Delaware 001-34145 20-4743916 (State or other jurisdiction (

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Primoris Services Corp (Name of Issuer) Common Stock (Title of Class of Securities) 74164F103 (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 S

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)* Name of issuer: Primoris Services Corp. Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is file

SCHEDULE 13G

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Primoris Services Corporation (Name of Issuer) Common Stock (Title of Class of Securities) 74164F103 (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

Amendment No 1. to Agreement and Plans of Merger, dated as of January 11, 2021 (incorporated by reference to Exhibit 2.2 to our Current Report on Form 8-K, as filed with the SEC on January 15, 2021)

Exhibit 2.2 AMENDMENT NO. 1 TO AGREEMENT AND PLAN OF MERGER This Amendment No. 1 (this "Amendment") to the Agreement and Plan of Merger (the "Merger Agreement"), dated December 14, 2020, by and among Future Infrastructure Holdings, LLC, Primoris Services Corporation, Primoris Merger Sub, LLC and Tower Arch Capital, L.P., solely in its capacity as representative as set forth in the Merger Agreement

Primoris Services Corporation Form of Inducement Award Restricted Stock Unit Agreement.

Exhibit 99.2 PRIMORIS SERVICES CORPORATION INDUCEMENT AWARD RESTRICTED STOCK UNIT AGREEMENT This Restricted Stock Unit Agreement (this “Agreement”) is made and entered into as of (the “Grant Date”) by and between Primoris Services Corporation, a Delaware corporation (the “Company”), and , an employee of the Company or its subsidiary (“Executive”). RECITALS A. The Company desires to recognize the c

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As filed with the Securities and Exchange Commission on January 15, 2021 Registration No.

Primoris Services Corporation Form of Inducement Award Stock Purchase Right Agreement.

Exhibit 99.1 PRIMORIS SERVICES CORPORATION INDUCEMENT AWARD STOCK PURCHASE RIGHT AGREEMENT This Stock Purchase Right Agreement (this “Agreement”) is made and entered into as of by and between Primoris Services Corporation, a Delaware corporation (the “Company”), and , an employee of the Company or its subsidiary (“Executive”). RECITALS A. The Company desires to recognize the contribution Executive

Second Amended and Restated Credit Agreement with CIBC Bank USA, as administrative agent, collateral agent and co-lead arranger, The Bank of the West, as co-lead arranger, and the financial institutions party thereto

Exhibit 10.1 SECOND AMENDED AND RESTATED CREDIT AGREEMENT dated as of January 15, 2021 among PRIMORIS SERVICES CORPORATION, as Borrower, THE VARIOUS FINANCIAL INSTITUTIONS PARTY HERETO, as Lenders, and CIBC BANK USA, as Administrative Agent, Joint Bookrunner, Joint Lead Arranger, Co-Documentation Agent and Collateral Agent Bank of the West as Joint Bookrunner, Joint Lead Arranger and Co-Documentat

Regulation FD Disclosure, Entry into a Material Definitive Agreement, 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 - 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 January 11, 2021 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number

Primoris Services Corporation Completes Future Infrastructure Acquisition

Exhibit 99.1 PRESS RELEASE Primoris Services Corporation Completes Future Infrastructure Acquisition DALLAS, TX – Jan. 15, 2021 – Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or “Company”), a leading provider of specialty contracting services in North America, announced today that it has closed its acquisition of Future Infrastructure Holdings, LLC (“Future Infrastructure

Agreement and Plan of Merger, dated December 14, 2020, among Primoris Services Corporation, Future Infrastructure Holdings, LLC, Primoris Merger Sub, LLC and Tower Arch Capital, L.P. (incorporated by reference to Exhibit 2.1 to our Current Report on Form 8-K, as filed with the SEC on December 15, 2020)

Exhibit 2.1 Execution Version Agreement and Plan of Merger by and among FUTURE INFRASTRUCTURE HOLDINGS, LLC, Primoris Services Corporation, Primoris Merger Sub, LLC, and the Representative named herein December 14, 2020 TABLE OF CONTENTS Page Article I THE MERGER 5 1.01 The Merger 5 1.02 Filing of Merger Certificate; Effective Time 5 1.03 Effect of the Merger; Further Assurances 6 1.04 Conversion

Investor Call Transcript

Exhibit 99.3 Corrected Transcript 15-Dec-2020 Primoris Services Corp.(PRIM) Acquisition of Future Infrastructure Holdings, LLC by Primoris Services Corporation Call CORPORATE PARTICIPANTS Brook Wootton Vice President-Investor Relations, Primoris Services Corp. Thomas E. McCormick Chief Executive Officer, President & Director, Primoris Services Corp. Ken M. Dodgen Chief Financial Officer & Executiv

Primoris to Acquire Future Infrastructure Holdings, LLC Establishing a Leading Telecom Services Platform December 14, 2020

Exhibit 99.2 Primoris to Acquire Future Infrastructure Holdings, LLC Establishing a Leading Telecom Services Platform December 14, 2020 Forward Looking Statements 1 Transaction Overview This presentation contains forward - looking statements within the meaning of the federal securities laws. These statements give the current expectations of the Company’s management. Words such as “could,” “will,”

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Other Events - 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 December 14, 2020 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numbe

Primoris Services Corporation to Acquire Future Infrastructure Holdings, LLC To Establish Leading Platform in Telecommunication Services

Exhibit 99.1 PRESS RELEASE Primoris Services Corporation to Acquire Future Infrastructure Holdings, LLC To Establish Leading Platform in Telecommunication Services DALLAS, TEXAS, December 14, 2020—Primoris Services Corporation (NASDAQ Global Select: PRIM), (“Primoris” or the “Company”), a leading provider of specialty contracting services in North America, today announced that it has entered into

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events - 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 November 5, 2020 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number

Quarterly Report - 10-Q

Table of Contents 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 n

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 1, 2020 Date of Report (Date of earliest event reported) Primoris Services C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 1, 2020 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

Form of Subordinated Indenture

Exhibit 4.5 PRIMORIS SERVICES CORPORATION and Trustee INDENTURE Dated as of , 20 SUBORDINATED DEBT SECURITIES CROSS-REFERENCE TABLE (1) Section of Trust Indenture Act of 1939, as amended Section of Indenture 310(a) 6.09 310(b) 6.08 6.10 310(c) Inapplicable 311(a) 6.13 311(b) 6.13 311(c) Inapplicable 312(a) 4.01 4.04 312(b) 4.04(c) 312(c) 4.04(c) 313(a) 4.03 313(b) 4.03 313(c) 4.03 313(d) 4.03 314(

Form of Senior Indenture

Exhibit 4.3 PRIMORIS SERVICES CORPORATION and , Trustee INDENTURE Dated as of , 20 SENIOR DEBT SECURITIES CROSS-REFERENCE TABLE(1) Section of Trust Indenture Act of 1939, as amended Section of Indenture 310(a) 6.09 310(b) 6.08 6.10 310(c) Inapplicable 311(a) 6.13 311(b) 6.13 311(c) Inapplicable 312(a) 4.01 4.04 312(b) 4.04(c) 312(c) 4.04(c) 313(a) 4.03 313(b) 4.03 313(c) 4.03 313(d) 4.03 314(a) 4.

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Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents As filed with the Securities and Exchange Commission on September 1, 2020 Registration No.

Amended and Restated Bylaws of Primoris Services Corporation, as amended August 2, 2019 (*)

Exhibit 3.1 AMENDED AND RESTATED BYLAWS OF RHAPSODY ACQUISITION CORP. a Delaware corporation PREAMBLE These bylaws are subject to, and governed by, the General Corporation Law of the State of Delaware (the “Delaware General Corporation Law”) and the certificate of incorporation, as it may be amended from time to time, of RHAPSODY ACQUISITION CORPORATION, a Delaware corporation (the “Corporation”).

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 July 31, 2020 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number) (

PRIMORIS SERVICES CORPORATION ANNOUNCES 2020 SECOND QUARTER FINANCIAL RESULTS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2020 SECOND QUARTER FINANCIAL RESULTS Ø Board of Directors Declares $0.06 Per Share Cash Dividend Financial Highlights ● 2020 Q2 revenue of $908.2 million, compared to $789.9 million in 2019 Q2 ● 2020 Q2 net income attributable to Primoris of $33.0 million, or $0.68 per fully diluted share, compared to $17.8 million, or $0.35 per fully diluted s

Quarterly Report - 10-Q

Table of Contents 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, 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

PRIM / Primoris Services Corp. / Pratt Brian - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 5)* PRIMORIS SERVICES CORPORATION (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 74164F103 (CUSIP Number) Brian Pratt 5950 Berkshire Ln, Ste. 800 Dallas, Texas 75225 Tel: (214) 220-3423 With a Copy to: Andrew Rosel

JOINT FILING AGREEMENT

EX-99.1 EXHIBIT 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the shares of Common Stock, $0.0001 par value per share, of Primoris Services Corporation, a Delaware corporation,

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 July 1, 2020 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number) (I

PRIMORIS SERVICES CORPORATION APPOINTS TWO NEW MEMBERS TO ITS BOARD OF DIRECTORS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION APPOINTS TWO NEW MEMBERS TO ITS BOARD OF DIRECTORS Dallas, TX – July 7, 2020 – Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or “Company”) today announced that its Board of Directors has appointed Patti Wagner and Terry McCallister as new directors, effective July 1, 2020. Ms. Wagner’s and Mr. McCallister’s appointed terms will ex

Quarterly Report - 10-Q

Table of Contents 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, 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 numbe

PRIMORIS SERVICES CORPORATION ANNOUNCES 2020 FIRST QUARTER FINANCIAL RESULTS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2020 FIRST QUARTER FINANCIAL RESULTS Ø Board of Directors Declares $0.06 Per Share Cash Dividend Financial Highlights · 2020 Q1 revenue of $743.2 million, compared to $661.6 million in 2019 Q1 · 2020 Q1 net loss attributable to Primoris of ($3.7 million), or ($0.08) per fully diluted share, compared to net income of $1.9 million, or $0.04 per fu

Financial Statements and Exhibits, Results of Operations and Financial Condition, 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 May 1, 2020 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number) (I.

PRIM / Primoris Services Corp. DEFA14A - - 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 x 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

definitive proxy statement for the 2020 Annual Meeting of Stockholders;

Use these links to rapidly review the document TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Annual Report - 10-K

Table of Contents 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, 2019 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: 001-34

the description of the Registrant's securities contained on Exhibit 4.2 to the Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2019, filed on February 25, 2020, including any amendments or reports filed for the purpose of updating such description.

Exhibit 4.2 Description of the Registrant’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 Primoris Services Corporation (“the Company”, “we”, “our”, or “us”) currently has one class of securities registered under Section 12 of the Securities Exchange Act of 1934, as amended, (“the Exchange Act”) our common stock, par value $0.0001 per share. The following desc

Subsidiaries and equity investments of Primoris Services Corporation (*)

Exhibit 21.1 Subsidiaries and Equity Investments of the Registrant Subsidiary Jurisdiction of Organization ARB, Inc. California ARB Structures, Inc. California ARB Chile, Ltda. Chile Cardinal Contractors, Inc. Florida James Construction Group, LLC Florida Juniper Rock Corporation California OnQuest, Inc. California OnQuest Canada, ULC (formerly Born Heaters Canada) Alberta OnQuest Heaters, Inc. De

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 February 21, 2020 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numbe

PRIMORIS SERVICES CORPORATION ANNOUNCES 2019 FOURTH QUARTER AND FULL YEAR FINANCIAL RESULTS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2019 FOURTH QUARTER AND FULL YEAR FINANCIAL RESULTS · Board of Directors Declares $0.06 Per Share Cash Dividend · Authorizes $25 Million Share Repurchase Program 2019 Full Year Financial Highlights · Record 2019 revenue of $3.1 billion, compared to $2.9 billion in 2018 · Record 2019 net income attributable to Primoris of $82.3 million, or $1.61

Agreement for Services, dated January 1, 2020, by and among Primoris Services Corporation and David King. (incorporated by reference to Exhibit 10.16 to our Annual Report on Form 10-K, as filed with the SEC on February 25, 2020) (#)

Exhibit 10.16 AGREEMENT FOR SERVICES This Agreement for Services (“Agreement”) is made and entered into as of January 1, 2020 between Primoris Services Corporation, a Delaware corporation (“PRIM”), and David King, an individual (hereinafter referred to as “COB/Advisor”). PRIM and COB/Advisor may be individually referred to as “Party” or collectively referred to herein as the “Parties.” A. INTRODUC

PRIM / Primoris Services Corp. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 4)* Name of issuer: Primoris Services Corp Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is filed

PRIM / Primoris Services Corp. / Pratt Brian - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A Under the Securities Exchange Act of 1934 (Amendment No. 4)* PRIMORIS SERVICES CORPORATION (Name of Issuer) Common Stock, $0.0001 par value (Title of Class of Securities) 74164F103 (CUSIP Number) Brian Pratt 5950 Berkshire Ln Dallas, Texas 75225 Tel: (214) 220-3423 With a Copy to: Andrew Rosell Winstead

Joint Filing Agreement, dated as of December 16, 2019 by and between the Reporting Persons.

EX-99.1 EXHIBIT 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a statement on Schedule 13D (including amendments thereto) with respect to the shares of Common Stock, $0.0001 par value per share, of Primoris Services Corporation, a Delaware corporation,

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

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 9, 2019 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number

PRIMORIS SERVICES CORPORATION ANNOUNCES REPURCHASE OF COMMON STOCK

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES REPURCHASE OF COMMON STOCK Dallas, TX – December 11, 2019– Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or “Company”) today announced that the Company has purchased 2,316,960 shares of common stock for an aggregate consideration of $50 million from Brian Pratt, a member of the Company’s Board of Directors (the “Board”).

Share Repurchase Agreement dated December 10, 2019

Exhibit 10.1 SHARE REPURCHASE AGREEMENT This Share Repurchase Agreement (this “Agreement”) is made as of December 10, 2019, by and among Primoris Services Corporation, a Delaware corporation (“Buyer”), and the shareholders of Buyer listed on Schedule A hereto (collectively, the “Sellers”). WITNESSETH: WHEREAS, the Sellers own shares of common stock, par value $0.0001 per share, of Buyer (“Common S

PRIMORIS SERVICES CORPORATION ANNOUNCES PENDING BOARD CHANGE

Exhibit 99.2 PRIMORIS SERVICES CORPORATION ANNOUNCES PENDING BOARD CHANGE Dallas, TX – December 9, 2019– Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or “Company”) today announced that Brian Pratt has informed the Board of Directors of his plan to step down as a Director of the Company at the adjournment of the next regularly scheduled Board meeting in February 2020. Mr.

PRIMORIS SERVICES CORPORATION ANNOUNCES EXECUTIVE TRANSITION

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES EXECUTIVE TRANSITION Dallas, TX – November 1, 2019– Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or “Company”) today announced its Board of Directors has approved an executive transition effective November 4, 2019. David King will transition out of his positon as Chief Executive Officer, while remaining as Chairman of t

Employment Agreement, dated November 4, 2019, by and among Primoris Services Corporation and Thomas McCormick. (incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K, as filed with the SEC on November 5, 2019) (#)

Exhibit 10.1 EMPLOYMENT AGREEMENT BETWEEN Primoris Services Corporation AND Thomas McCormick November 4, 2019 EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT (“Agreement”) is made and entered into and becomes effective as of November 4, 2019, by and between Primoris Services Corporation, a Delaware corporation (the “Employer”), and Thomas McCormick (the “Employee”). WHEREAS, the Employer desires to

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 November 1, 2019 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number

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 October 31, 2019 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number

PRIMORIS SERVICES CORPORATION ANNOUNCES 2019 THIRD QUARTER FINANCIAL RESULTS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2019 THIRD QUARTER FINANCIAL RESULTS Ø Board of Directors Declares $0.06 Per Share Cash Dividend Ø Authorizes $50 Million Share Repurchase Plan Financial Highlights · 2019 Q3 revenue of $865.1 million, compared to $908.9 million in 2018 Q3 · Record 2019 Q3 net income attributable to Primoris of $35.6 million, or $0.70 per fully diluted share o C

Quarterly Report - 10-Q

Table of Contents 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, 2019 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 n

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 August 2, 2019 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

PRIMORIS SERVICES CORPORATION ANNOUNCES 2019 SECOND QUARTER FINANCIAL RESULTS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2019 SECOND QUARTER FINANCIAL RESULTS Ø Board of Directors Declares $0.06 Per Share Cash Dividend Ø Tom McCormick appointed to Board of Directors Financial Highlights · 2019 Q2 revenue of $789.9 million, compared to $648.8 million in 2018 Q2, a 21.7% increase o 2019 Q2 MSA revenue of $348.3 million, a 46% increase over 2018 Q2 MSA revenue · 2019

Agreement for Services, dated July 1, 2019, by and among Primoris Services Corporation and Brian Pratt. (incorporated by reference to Exhibit 10.1 to our Quarterly Report on Form 10-Q, as filed with the SEC on August 6, 2019) (#)

Exhibit 10.1 AGREEMENT FOR SERVICES This Agreement for Services (“Agreement”) is made and entered into as of July 1, 2019 between Primoris Services Corporation, a Delaware corporation (“PRIM”), and Brian Pratt, an individual (hereinafter referred to as “Director/Advisor”) and supersedes, in its entirety, the agreement entered into between PRIM and Director/Advisor dated August 1, 2015. PRIM and Di

Quarterly Report - 10-Q

Table of Contents 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, 2019 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

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition, 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 May 7, 2019 (May 3, 2019) Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission Fi

PRIMORIS SERVICES CORPORATION ANNOUNCES 2019 FIRST QUARTER FINANCIAL RESULTS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2019 FIRST QUARTER FINANCIAL RESULTS Ø Board of Directors Declares $0.06 Per Share Cash Dividend Ø Chairman of the Board Transition Financial Highlights · 2019 Q1 revenue of $661.6 million, compared to $504.1 million in 2018 Q1 o 2019 Q1 MSA revenue of $292.9 million, a 100% increase over 2018 Q1 MSA revenue · 2019 Q1 net income attributable to

Quarterly Report - 10-Q

Table of Contents 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, 2019 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

Employment Agreement, dated April 1, 2019, by and among Primoris Services Corporation and John F. Moreno, Jr. (incorporated by reference to Exhibit 10.1 to our Quarterly Report on Form 10-Q, as filed with the SEC on May 7, 2019) (#)

Exhibit 10.1 EMPLOYMENT AGREEMENT BETWEEN John F. Moreno, Jr. AND Primoris Services Corporation April 1, 2019 EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT is made and entered into as of April 1, 2019, (“effective Date”) (as hereafter defined), by and among Primoris Services Corporation, a Delaware corporation (the “Employer”), and John F. Moreno, Jr. (the “Employee”). WHEREAS, the Employer desir

PRIM / Primoris Services Corp. DEF 14A

Use these links to rapidly review the document PROXY STATEMENT TABLE OF CONTENTS Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 April 3, 2019 (April 1, 2019) Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commissio

PRIMORIS SERVICES CORPORATION ANNOUNCES HIRING OF JOHN MORENO, JR AS CHIEF OPERATING OFFICER

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES HIRING OF JOHN MORENO, JR AS CHIEF OPERATING OFFICER Dallas, TX – April 1, 2019 – Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or “Company”) today announced that John F. Moreno, Jr. has been hired as its Chief Operating Officer. Mr. Moreno will take over the role from Tom McCormick, who has been promoted to President of

EMPLOYMENT AGREEMENT BETWEEN John F. Moreno, Jr. AND Primoris Services Corporation April 1, 2019

Exhibit 99.2 EMPLOYMENT AGREEMENT BETWEEN John F. Moreno, Jr. AND Primoris Services Corporation April 1, 2019 EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT is made and entered into as of April 1, 2019, (“effective Date”) (as hereafter defined), by and among Primoris Services Corporation, a Delaware corporation (the “Employer”), and John F. Moreno, Jr. (the “Employee”). WHEREAS, the Employer desir

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 March 27, 2019 (March 25, 2019) Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commiss

PRIMORIS SERVICES CORPORATION APPOINTS CARLA S. MASHINSKI AS A MEMBER OF ITS BOARD OF DIRECTORS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION APPOINTS CARLA S. MASHINSKI AS A MEMBER OF ITS BOARD OF DIRECTORS Dallas, TX – March 27, 2019 – Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or “Company”) today announced that its Board of Directors has appointed Carla S. Mashinski as a new director, effective March 25, 2019, filling a Board vacancy. Ms. Mashinski’s appointed ter

PRIMORIS SERVICES CORPORATION ANNOUNCES 2018 FOURTH QUARTER AND FULL YEAR FINANCIAL RESULTS

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2018 FOURTH QUARTER AND FULL YEAR FINANCIAL RESULTS Board of Directors Declares $0.06 Per Share Cash Dividend Financial Highlights · Record 2018 revenue of $2.9 billion, compared to $2.4 billion in 2017 · 2018 Q4 revenue of $877.7 million, compared to $579.0 million in 2017 Q4 · Record 2018 net income attributable to Primoris of $77.5 million, o

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 February 28, 2019 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Numbe

Subsidiaries and equity investments of Primoris Services Corporation (*)

Exhibit 21.1 Subsidiaries and Equity Investments of the Registrant Subsidiary Jurisdiction of Organization ARB, Inc. California ARB Structures, Inc. California ARB Chile, Ltda. Chile Cardinal Contractors, Inc. Florida GML Coatings, LLC Florida James Construction Group, LLC Florida Juniper Rock Corporation California OnQuest, Inc. California OnQuest Canada, ULC (formerly Born Heaters Canada) Albert

PRIM / Primoris Services Corp. 10-K (Annual Report)

Table of Contents 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, 2018 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: 001-34

PRIM / Primoris Services Corp. / VANGUARD GROUP INC Passive Investment

primorisservicescorp.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 3 )* Name of issuer: Primoris Services Corp Title of Class of Securities: Common Stock CUSIP Number: 74164F103 Date of Event Which Requires Filing of this Statement: December 31, 2018 Check the appropri

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 November 6, 2018 (November 2, 2018) Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Com

For the three months ended September 30,

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2018 THIRD QUARTER FINANCIAL RESULTS Board of Directors Declares $0.06 Per Share Cash Dividend Financial Highlights · 2018 Q3 revenues of $908.9 million, record level and a 49% increase over 2017 Q3 revenues · 2018 Q3 operating income of $51.1 million, a 83% increase over 2017 Q3 operating income · 2018 Q3 net income attributable to Primoris of

PRIM / Primoris Services Corp. 10-Q (Quarterly Report)

Table of Contents 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, 2018 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 num

Fifth Amended and Restated Certificate of Incorporation of Primoris Services Corporation, dated May 4, 2018 (incorporated by reference to Exhibit 3.1 to our Quarterly Report on Form 10-Q, as filed with the SEC on November 11, 2018)

Exhibit 3.1 FIFTH AMENDED AND RESTATED CERTIFICATE OF INCORPORATION OF PRIMORIS SERVICES CORPORATION. Pursuant to Sections 242 and 245 of the Delaware General Corporation Law Primoris Services Corporation, a corporation existing under the laws of the State of Delaware (the “Corporation”), by its Secretary, hereby certifies as follows: 1. The Corporation’s Certificate of Incorporation was filed in

PRIMORIS SERVICES CORPORATION ANNOUNCES CHIEF FINANCIAL OFFICER PLANNED TRANSITION

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES CHIEF FINANCIAL OFFICER PLANNED TRANSITION Dallas, TX – October 5, 2018– Primoris Services Corporation (NASDAQ Global Select: PRIM) (“Primoris” or “Company”) today announced the planned retirement of its Executive Vice President and Chief Financial Officer, Peter J. Moerbeek, after ten years of service to Primoris. Mr. Moerbeek will resign as a

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, 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 October 5, 2018 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

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 August 14, 2018 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number)

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 June 1, 2018 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commis

UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS

Exhibit 99.3 UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS Introduction On June 1, 2018, Primoris Services Corporation, a Delaware corporation (“Primoris”), completed its previously announced acquisition of Willbros Group, Inc., a Delaware corporation (“Willbros”). Pursuant to the terms of that Agreement and Plan of Merger (the “Merger Agreement”) dated as of March 27, 2018, Waco Acquisition V

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 August 7, 2018 (August 2, 2018) Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commiss

For the three months ended June 30,

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2018 SECOND QUARTER FINANCIAL RESULTS Board of Directors Declares $0.06 Per Share Cash Dividend Financial Highlights · 2018 Q2 revenues of $648.8 million · For month of June 2018, revenues were $61 million for acquired Willbros entities · 2018 Q2 operating income of $20.3 million · For month of June 2018, operating income, excluding merger and r

Second Amendment to Amended and Restated Credit Agreement by and among Primoris Services Corporation and CIBC Bank USA, Bank of the West, Capital One, N.A., Regions Bank, Branch Banking and Trust Company, IBERIABANK, Bank of America, and Simmons Bank (incorporated by reference to Exhibit 10.2 to our Quarterly Report on Form 10-Q, as filed with the SEC on August 7, 2018)

Exhibit 10.2 SECOND AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (THE “SECOND AMENDMENT”) DATED AS OF AUGUST 3, 2018 AND EFFECTIVE AS OF JULY 9, 2018 Reference is made to the AMENDED AND RESTATED CREDIT AGREEMENT, dated as of September 29, 2017, (as amended, restated, supplemented or otherwise modified to date, the “Credit Agreement”) among CIBC Bank USA, as Administrative Agent, Collateral

PRIM / Primoris Services Corp. 10-Q (Quarterly Report)

Table of Contents 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, 2018 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 0

First Amendment and Joinder to Amended and Restated Credit Agreement by and among Primoris Services Corporation and CIBC Bank USA, Bank of the West, Capital One, N.A., Regions Bank, Branch Banking and Trust Company, IBERIABANK, Bank of America, and Simmons Bank (incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K, as filed with the SEC on July 9, 2018)

Exhibit 10.1 FIRST AMENDMENT AND JOINDER TO AMENDED AND RESTATED CREDIT AGREEMENT (THE “FIRST AMENDMENT”) DATED AS OF JULY 9, 2018 Reference is made to the AMENDED AND RESTATED CREDIT AGREEMENT, dated as of September 29, 2017, (as amended, restated, supplemented or otherwise modified to date, the “Credit Agreement”) among CIBC Bank USA, as Administrative Agent, Collateral Agent, Joint Lead Arrange

Entry into a Material Definitive Agreement, 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 July 9, 2018 Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission File Number) (I

WG / Willbros Group, Inc. / Primoris Services Corp - SC 13D/A Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) Under the Securities and Exchange Act of 1934 (Amendment No. 1)* Willbros Group, Inc. (Name of Issuer) Common Stock, par value $0.05 per share (Title of Class of Securities) 969203108 (C

Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets

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 June 6, 2018 (June 1, 2018) Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission

For the three months ended March 31,

Exhibit 99.1 PRIMORIS SERVICES CORPORATION ANNOUNCES 2018 FIRST QUARTER FINANCIAL RESULTS Board of Directors Declares $0.06 Per Share Cash Dividend and Authorizes $5 Million Share Repurchase Plan Financial Highlights · 2018 Q1 revenue of $504.1 million · 2018 Q1 net income attributable to Primoris of $0.7 million, or $0.01 per fully diluted share · 2018 Q1 cash flow from operations of $3.7 million

Financial Statements and Exhibits, Results of Operations and Financial Condition, 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 May 8, 2018 (May 4, 2018) Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commission Fi

PRIM / Primoris Services Corp. 10-Q (Quarterly Report)

Table of Contents 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, 2018 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

VOTING AND SUPPORT AGREEMENT

Exhibit 10 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between Primoris Services Corporation, a Delaware corporation (“Parent”), and S.

VOTING AND SUPPORT AGREEMENT

Exhibit 11 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between Primoris Services Corporation, a Delaware corporation (“Parent”), and W.

VOTING AND SUPPORT AGREEMENT

Exhibit 5 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between PRIMORIS SERVICES CORPORATION, a Delaware corporation (“Parent”), and KKR CREDIT SELECT FUNDING LLC (“Stockholder”).

VOTING AND SUPPORT AGREEMENT

Exhibit 6 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between PRIMORIS SERVICES CORPORATION, a Delaware corporation (“Parent”), and KKR — VRS CREDIT PARTNERS L.

VOTING AND SUPPORT AGREEMENT

Exhibit 8 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between PRIMORIS SERVICES CORPORATION, a Delaware corporation (“Parent”), and LINCOLN INVESTMENT SOLUTIONS, INC.

VOTING AND SUPPORT AGREEMENT

Exhibit 3 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between PRIMORIS SERVICES CORPORATION, a Delaware corporation (“Parent”), and KKR LENDING PARTNERS II L.

VOTING AND SUPPORT AGREEMENT

Exhibit 7 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between PRIMORIS SERVICES CORPORATION, a Delaware corporation (“Parent”), and CORPORATE CAPITAL TRUST, INC.

VOTING AND SUPPORT AGREEMENT

Exhibit 4 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between PRIMORIS SERVICES CORPORATION, a Delaware corporation (“Parent”), and KKR LENDING PARTNERS FUNDING III LLC (“Stockholder”).

VOTING AND SUPPORT AGREEMENT

Exhibit 2 EXECUTION VERSION VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between PRIMORIS SERVICES CORPORATION, a Delaware corporation (“Parent”), and KKR LENDING PARTNERS FUNDING LLC (“Stockholder”).

VOTING AND SUPPORT AGREEMENT

Exhibit 9 VOTING AND SUPPORT AGREEMENT THIS VOTING AND SUPPORT AGREEMENT (“Agreement”) is entered into as of March 27, 2018, by and between Primoris Services Corporation, a Delaware corporation (“Parent”), and Michael J.

WG / Willbros Group, Inc. / Primoris Services Corp - SC 13D Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (RULE 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULE 13D-1(A) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(a) Under the Securities and Exchange Act of 1934 Willbros Group, Inc. (Name of Issuer) Common Stock, par value $0.05 per share (Title of Class of Securities) 969203108 (CUSIP Number) Primor

PRIM / Primoris Services Corp. DEF 14A

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 x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14

Agreement and Plan of Merger dated March 27, 2018, among Primoris Services Corporation, Waco Acquisition Vehicle, Inc., and Willbros Group, Inc. (incorporated by reference to Exhibit 2.1 to our Current Report on Form 8-K, as filed with the SEC on March 28, 2018)

Exhibit 2.1 AGREEMENT AND PLAN OF MERGER among PRIMORIS SERVICES CORPORATION, WACO ACQUISITION VEHICLE, INC., and WILLBROS GROUP, INC. Dated as of March 27, 2018 TABLE OF CONTENTS Page ARTICLE I DEFINITIONS; INTERPRETATION 1 1.1 Definitions 1 1.2 Interpretation 14 ARTICLE II THE MERGER; CLOSING; EFFECTIVE TIME 15 2.1 The Merger 15 2.2 Closing 15 2.3 Effective Time 15 ARTICLE III CERTIFICATE OF INC

Corrected Transcript 28-Mar-2018 Primoris Services Corp. (PRIM) Acquisition of Willbros Group, Inc. by Primoris Services Corp. Call Total Pages: 15 Copyright © 2001-2018 FactSet CallStreet, LLC 1-877-FACTSET www.callstreet.com

Exhibit 99.3 Corrected Transcript 28-Mar-2018 Primoris Services Corp. (PRIM) Acquisition of Willbros Group, Inc. by Primoris Services Corp. Call Total Pages: 15 Copyright © 2001-2018 FactSet CallStreet, LLC 1-877-FACTSET www.callstreet.com Primoris Services Corp. (PRIM) Acquisition of Willbros Group, Inc. by Primoris Services Corp. Call Corrected Transcript 28-Mar-2018 CORPORATE PARTICIPANTS Kate

Primoris Services Corporation to Acquire Willbros Group, Inc. March 28, 2018 Continued Diversification for Growth

Exhibit 99.2 Primoris Services Corporation to Acquire Willbros Group, Inc. March 28, 2018 Continued Diversification for Growth Forward-Looking Statements This communication contains forward-looking statements, including but not limited to those regarding the proposed acquisition by Primoris Services Corporation (“Primoris”) of Willbros Group, Inc. (“Willbros”) (the “Acquisition”) and the transacti

PRIMORIS SERVICES CORPORATION TO ACQUIRE WILLBROS GROUP, INC. Primoris Expects to Create New Electrical Utility Transmission and Distribution Segment Conference Call and Webcast Scheduled for 8:30 AM ET Today

Exhibit 99.1 PRIMORIS SERVICES CORPORATION TO ACQUIRE WILLBROS GROUP, INC. Primoris Expects to Create New Electrical Utility Transmission and Distribution Segment Conference Call and Webcast Scheduled for 8:30 AM ET Today DALLAS, TEXAS — March 28, 2018 — Primoris Services Corporation (NASDAQ:PRIM) (“Primoris”) today announced that it has entered into a definitive merger agreement to acquire Willbr

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 March 28, 2018 (March 27, 2018) Date of Report (Date of earliest event reported) Primoris Services Corporation (Exact name of Registrant as specified in its charter) Delaware 001-34145 20-4743916 (State or other jurisdiction (Commiss

Investor Presentation dated March 28, 2018

Exhibit 99.2 Primoris Services Corporation to Acquire Willbros Group, Inc. March 28, 2018 Continued Diversification for Growth Forward-Looking Statements This communication contains forward-looking statements, including but not limited to those regarding the proposed acquisition by Primoris Services Corporation (“Primoris”) of Willbros Group, Inc. (“Willbros”) (the “Acquisition”) and the transacti