NPWR / NET Power Inc. - Pemfailan SEC, Laporan Tahunan, Penyata Proksi

NET Power Inc.
US ˙ NYSE ˙ US64107A1051

Statistik Asas
CIK 1845437
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to NET Power Inc.
SEC Filings (Chronological Order)
Halaman ini menyediakan senarai kronologi lengkap bagi Pemfailan SEC, tidak termasuk pemfailan pemilikan yang kami sediakan di tempat lain.
August 11, 2025 10-Q

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x 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 o 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 001-40503 NET Power Inc. (Exact

August 11, 2025 EX-99.1

Net Power Reports Second Quarter 2025 Results and Provides Business Update

Net Power Reports Second Quarter 2025 Results and Provides Business Update DURHAM, N.

August 11, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 11, 2025 NET POWER INC. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 11, 2025 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Num

July 15, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 10, 2025 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Numbe

June 20, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 12, 2025 NET POWER INC. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 12, 2025 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Numbe

June 6, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 3, 2025 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Number

May 12, 2025 EX-99.1

Net Power Reports First Quarter 2025 Results and Provides Business Update

Net Power Reports First Quarter 2025 Results and Provides Business Update DURHAM, N.

May 12, 2025 10-Q

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x 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 o 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 001-40503 NET Power Inc. (Exact

May 12, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 12, 2025 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Number

April 24, 2025 DEF 14A

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

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

April 24, 2025 DEFA14A

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

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

April 15, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): April 14, 2025 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Numb

March 21, 2025 8-K

Financial Statements and Exhibits, Changes in Registrant's Certifying Accountant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 17, 2025 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Numb

March 21, 2025 EX-16.1

Letter from Grant Thornton LLP to the Securities and Exchange Commission dated March

March 17, 2025 U.S. Securities and Exchange Commission Office of the Chief Accountant 100 F Street, NE Washington, DC 20549 Re: NET Power Inc. File No. 001-40503 Dear Sir or Madam: We have read Item 4.01 of Form 8-K of NET Power Inc. dated March 17, 2025, and agree with the statements concerning our Firm contained therein. Very truly yours, /s/ GRANT THORNTON LLP

March 10, 2025 10-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ 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 001-40503 NET Power Inc. (Exact name

March 10, 2025 EX-99.1

Net Power Reports Fourth Quarter 2024 Results and Provides Business Update

Net Power Reports Fourth Quarter 2024 Results and Provides Business Update DURHAM, N.

March 10, 2025 EX-21.1

Subsidiaries of the Company

EX-21.1 4 a09np-202410xkxex211.htm EX-21.1 Exhibit 21.1 List of Subsidiaries of NET Power Inc. as of March 10, 2025 Name Jurisdiction of Incorporation or Organization NET Power Operations LLC DE NET Power Intermediate LLC DE NET Power, LLC DE NET Power Atlas, LLC DE NET Power Canaveral, LLC DE NET Power Europe LTD United Kingdom NET Power Friendship 7, LLC DE NET Power Services, LLC DE NET Power T

March 10, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 10, 2025 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Numb

March 10, 2025 EX-19.1

nsider Trading Policy

EX-19.1 3 a08np-202410xkxex191.htm EX-19.1 INSIDER TRADING POLICY Adopted June 13, 2023 PURPOSE This Insider Trading Policy (this “Policy”) provides guidelines with respect to transactions in the securities of NET Power Inc. (collectively with its subsidiaries, the “Company”) and the handling of confidential information about the Company and the companies with which the Company does business. The

March 10, 2025 EX-10.5

hird Amended and Restated Limited Liability Company Agreement of NET Power Operations LLC, dated as of January

Exhibit 10.5 EXECUTION VERSION THIRD AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF NET POWER OPERATIONS LLC DATED AS OF JANUARY 17, 2025 THE LIMITED LIABILITY COMPANY INTERESTS IN NET POWER OPERATIONS LLC HAVE NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED, THE SECURITIES LAWS OF ANY STATE, OR ANY OTHER APPLICABLE SECURITIES LAWS, AND HAVE BEEN OR ARE BEING ISS

November 26, 2024 SC 13D/A

NPWR / NET Power Inc. / 8 Rivers Capital, LLC - SC 13D/A Activist Investment

SC 13D/A 1 tm2429528d1sc13da.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 4)* NET Power Inc. (Name of Issuer) Class A Common Stock, par value $0.0001 (Title of Class of Securities) 64107A

November 19, 2024 CORRESP

NET Power Inc. 320 Roney Street, Suite 200 Durham, North Carolina 27701 November 19, 2024

NET Power Inc. 320 Roney Street, Suite 200 Durham, North Carolina 27701 November 19, 2024 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, NE Washington, D.C. 20549 Attention: Bradley Ecker Re: NET Power Inc. Registration Statement on Form S-3 File No. 333-283272 Ladies and Gentlemen: Pursuant to Rule 461 under the Sec

November 15, 2024 S-3

As filed with the Securities and Exchange Commission on November 15, 2024

As filed with the Securities and Exchange Commission on November 15, 2024 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 98-1580612 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identifica

November 15, 2024 EX-FILING FEES

Filing Fee Table.

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

November 12, 2024 EX-99.1

Net Power Reports Third Quarter 2024 Results and Provides Business Update

Exhibit 99.1 Net Power Reports Third Quarter 2024 Results and Provides Business Update •Commissioning first phase of Baker Hughes equipment validation at La Porte demonstration facility •Advanced Front-End Engineering and Design (FEED) work for Project Permian, the Company’s first utility-scale project in West Texas; FEED on track to conclude in Q4 2024 •Signed third Limited Notice to Proceed (LNT

November 12, 2024 10-Q

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x 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 o 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 001-40503 NET Power Inc. (E

November 12, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 11, 2024 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File N

November 12, 2024 EX-10.1

Regarding Letter of Limited Notice to Proceed for the Purchase of KPEP Long Lead Items

Exhibit 10.1 DATED September 30, 2024 Variation agreement No. 2 NET Power, LLC and Baker Hughes Energy Services LLC Regarding Letter of Limited Notice to Proceed for the Purchase of KPEP Long Lead Time Items This Variation Agreement No.2 is dated September 30, 2024 Parties 1.NET Power, LLC, 320 Roney Street, Suite 200 Durham, NC 27701 (NP) 2.Baker Hughes Energy Services LLC 575 N. Dairy Ashford Ho

October 21, 2024 SC 13D/A

NPWR / NET Power Inc. / 8 Rivers Capital, LLC - SC 13D/A Activist Investment

SC 13D/A 1 tm2426581d1sc13da.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 3)* NET Power Inc. (Name of Issuer) Class A Common Stock, par value $0.0001 (Title of Class of Securities) 64107A

October 4, 2024 8-K

Entry into a Material Definitive Agreement

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 30, 2024 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File

September 23, 2024 SC 13D/A

NPWR / NET Power Inc. / 8 Rivers Capital, LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 2)* NET Power Inc. (Name of Issuer) Class A Common Stock, par value $0.0001 (Title of Class of Securities) 64107A105 (CUSIP Number) Asheley Kinsey Chief Fi

September 18, 2024 CORRESP

September 18, 2024

September 18, 2024 Division of Corporation Finance Office of Manufacturing U. S. Securities and Exchange Commission 100 F Street, NE Washington DC 20549 Attention: Heather Clark Melissa Gilmore Re: NET Power Inc. Form 10-K for the Year Ended December 31, 2023 Filed March 11, 2024 File No. 001-40503 Dear Ms. Clark and Ms. Gilmore, NET Power Inc. (the “Company”) is in receipt of the letter dated Sep

September 10, 2024 EX-99.1

Investor Presentation September 2024 2 Cautionary Note Regarding Forward-Looking Statements and Projections. Certain statements in this presentation may constitute “forward-looking statements” within the meaning of Section 27A of the Securities Act o

investorday2024a Investor Presentation September 2024 2 Cautionary Note Regarding Forward-Looking Statements and Projections.

September 10, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 10, 2024 NET POWER INC.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): September 10, 2024 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File

August 27, 2024 CORRESP

NET Power Inc. 320 Roney St., Suite 200 Durham, North Carolina 27701

NET Power Inc. 320 Roney St., Suite 200 Durham, North Carolina 27701 August 27, 2024 VIA EDGAR Division of Corporation Finance Office of Manufacturing U.S. Securities and Exchange Commission 100 F Street, NE Washington DC 20549 Attention: Heather Clark Melissa Gilmore Re: NET Power Inc. Form 10-K for the Year Ended December 31, 2023 Filed March 11, 2024 File No. 001-40503 Dear Ms. Clark and Ms. Gi

August 12, 2024 10-Q

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x 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 o 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 001-40503 NET Power Inc. (Exact

August 12, 2024 EX-99.1

NET Power Reports Second Quarter 2024 Results and Provides Business Update

NET Power Reports Second Quarter 2024 Results and Provides Business Update •Continued site work at La Porte demonstration facility in preparation for upcoming equipment validation campaigns; Baker Hughes combustor test rig on schedule to ship to La Porte in Q3 2024; first phase of testing on schedule to begin in Q4 2024 •Advanced Front-End Engineering and Design (FEED) work for Project Permian, th

August 12, 2024 EX-10.2

Performance Stock

Exhibit 10.2 NET POWER INC. 2023 OMNIBUS INCENTIVE PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Pursuant to the terms and conditions of the NET Power Inc. 2023 Omnibus Incentive Plan, as amended from time to time (the “Plan”), NET Power Inc., a Delaware corporation (the “Company”), hereby grants to the individual listed below (“you” or the “Participant”) the number of performance stock units (the “PSU

August 12, 2024 EX-10.3

tock Option Grant Notice and

Exhibit 10.3 NET POWER, INC. 2023 OMNIBUS INCENTIVE PLAN STOCK OPTION GRANT NOTICE Pursuant to the terms and conditions of the NET Power, Inc. 2023 Omnibus Incentive Plan, as amended from time to time (the “Plan”), NET Power, Inc., a Delaware corporation (the “Company”), hereby grants to the individual listed below (“you” or the “Participant”) the right and option to purchase all or any part of th

August 12, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 12, 2024 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Num

July 8, 2024 424B3

NET POWER INC. 200,445,567 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK

Filed pursuant to Rule 424(b)(3) Registration No. 333-273183 NET POWER INC. 200,445,567 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK This prospectus relates to the resale from time to time of 200,445,567 shares of our Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), by the selling security holders named in this prospec

July 1, 2024 POS AM

As filed with the Securities and Exchange Commission on July 1, 2024

As filed with the Securities and Exchange Commission on July 1, 2024 No. 333-273183 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 3 TO FORM S-1 ON FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 98-1580612 (State or other jurisdiction of incorporati

June 10, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 4, 2024 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Number

May 28, 2024 SC 13D/A

NPWR / NET Power Inc. / 8 Rivers Capital, LLC - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. 1)* NET Power Inc. (Name of Issuer) Class A Common Stock, par value $0.0001 (Title of Class of Securities) 64107A105 (CUSIP Number) Chris Richardson Chief

May 24, 2024 424B3

NET POWER INC. 203,473,864 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK

Filed pursuant to Rule 424(b)(3) Registration No. 333-273183 NET POWER INC. 203,473,864 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK This prospectus relates to the resale from time to time of 203,473,864 shares of our Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), by the selling security holders named in this prospec

May 17, 2024 POS AM

As filed with the Securities and Exchange Commission on May 17, 2024

As filed with the Securities and Exchange Commission on May 17, 2024 No. 333-273183 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 2 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 3620 98-1580612 (State or other jurisdiction of incorporation or o

May 13, 2024 EX-10.2

Executive Form RSU

NET POWER INC. 2023 OMNIBUS INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT NOTICE Pursuant to the terms and conditions of the NET Power Inc. 2023 Omnibus Incentive Plan, as amended from time to time (the “Plan”), NET Power Inc., a Delaware corporation (the “Company”), hereby grants to the individual listed below (“you” or the “Participant”) the number of restricted stock units (the “RSUs”) set forth b

May 13, 2024 424B3

NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK

PROSPECTUS SUPPLEMENT NO. 4 Filed pursuant to Rule 424(b)(3) (To prospectus dated September 25, 2023) Registration No. 333-273183 NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK This prospectus supplement is being filed to update and supplement the information contained in the prospectus dated September 25, 2023 (the “Prospec

May 13, 2024 EX-99.1

NET Power Reports First Quarter 2024 Results and Provides Business Update

NET Power Reports First Quarter 2024 Results and Provides Business Update •Continued site work at La Porte demonstration facility in preparation for upcoming equipment validation campaigns with Baker Hughes •Progressed Front-End Engineering and Design (FEED) work for Project Permian, the Company’s first utility-scale project in West Texas •Filed interconnection application with Midcontinent Independent System Operator (MISO) for OP1, the Company’s first originated project Durham, NC – NET Power Inc.

May 13, 2024 10-Q

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q x 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 o 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 001-40503 NET Power Inc. (Exact

May 13, 2024 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): May 13, 2024 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Number

April 29, 2024 424B3

NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK

PROSPECTUS SUPPLEMENT NO. 3 Filed pursuant to Rule 424(b)(3) (To prospectus dated September 25, 2023) Registration No. 333-273183 NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK This prospectus supplement is being filed to update and supplement the information contained in the prospectus dated September 25, 2023 (the “Prospec

April 26, 2024 DEF 14A

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

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

March 13, 2024 POS EX

As filed with the Securities and Exchange Commission on March 13, 2024

As filed with the Securities and Exchange Commission on March 13, 2024 No. 333-273183 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 3620 98-1580612 (State or other jurisdiction of incorporation or

March 13, 2024 424B3

NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK

PROSPECTUS SUPPLEMENT NO. 2 Filed pursuant to Rule 424(b)(3) (To prospectus dated September 25, 2023) Registration No. 333-273183 NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK This prospectus supplement is being filed to update and supplement the information contained in the prospectus dated September 25, 2023 (the “Prospec

March 11, 2024 EX-4.2

Description of Securities.

DESCRIPTION OF SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following summary describes the Class A common stock, par value $0.

March 11, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): March 11, 2024 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Numb

March 11, 2024 10-K

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 ☒ 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 001-40503 NET Powe

March 11, 2024 EX-10.1

NET Power Inc. Amended and Restated Executive Severance Plan

NET POWER INC. FIRST AMENDED & RESTATED EXECUTIVE SEVERANCE PLAN 1.Purpose. NET Power Inc. (the “Company”) has adopted the NET Power Inc. First Amended & Restated Executive Severance Plan (the “Plan”) to provide severance pay and benefits to eligible officers and management employees who are Eligible Executives (as defined below) and whose employment is terminated on or after March 7, 2024 (the “E

March 11, 2024 EX-99.1

NET Power Reports Fourth Quarter and Year End 2023 Results and Provides Business Update

NET Power Reports Fourth Quarter and Year End 2023 Results and Provides Business Update •Progressed Front-End Engineering and Design (FEED) for Project Permian, the Company’s first utility-scale project in West Texas; signed Limited Notice to Proceed (LNTP) with Baker Hughes to release long-lead material for the first utility-scale turboexpander •Signed Strategic Supplier Agreement with Lummus Technology to design and supply recuperative heat exchangers (“HXRs”) for NET Power’s near-zero emissions power generation cycle Durham, NC – NET Power Inc.

March 11, 2024 EX-10.8

ctor Form RSU Grant Notice and Award Agreement

NET POWER INC. 2023 Omnibus Incentive Plan NON-EMPLOYEE DIRECTOR RESTRICTED STOCK UNIT GRANT NOTICE Pursuant to the terms and conditions of the NET Power Inc. 2023 Omnibus Incentive Plan, as amended from time to time (the “Plan”), NET Power Inc., a Delaware corporation (the “Company”), hereby grants to the individual listed below (“you” or the “Participant”) the number of restricted stock units (t

March 11, 2024 EX-97.1

Clawback Policy.

CLAWBACK POLICY NET POWER INC. PURPOSE NET Power Inc. (the “Company”) believes that it is in the best interests of the Company and its shareholders to create and maintain a culture that emphasizes integrity and accountability and that reinforces the Company’s pay-for-performance compensation philosophy. The Company’s Board of Directors (the “Board”) has therefore adopted this policy, which provide

March 11, 2024 EX-21.1

Subsidiaries of the Company.

Exhibit 21.1 List of Subsidiaries of NET Power Inc. as of March 11, 2024 Name Jurisdiction of Incorporation or Organization NET Power Operations LLC DE NET Power Intermediate LLC DE NET Power, LLC DE NET Power Atlas, LLC DE NET Power Canaveral, LLC DE NET Power Europe LTD United Kingdom NET Power Friendship 7, LLC DE NET Power Services, LLC DE NET Power Technology, LLC DE NET Power Management Hold

February 14, 2024 SC 13G/A

NPWR / NET Power Inc. / KENSICO CAPITAL MANAGEMENT CORP - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 s13ga123123-netpower.htm SCHEDULE 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b),(c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 2) * NET Power Inc. (Name of Issuer) Class A Common St

February 14, 2024 SC 13G/A

NPWR / NET Power Inc. / Rice Acquisition Sponsor II LLC - AMENDMENT NO. 1 TO 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)* NET Power Inc. (Name of Issuer) Class A common stock, par value $0.0001 per share (Title of Class of Securities) 64107A 105 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate th

February 12, 2024 SC 13G/A

NPWR / NET Power Inc. / ARISTEIA CAPITAL LLC Passive Investment

SC 13G/A 1 formnetpowersc13ga.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G (Rule 13d-102) Under the Securities Exchange Act of 1934 (Amendment No. 1) NET Power Inc. (Name of Issuer) Class A Common Stock (Title of Class of Securities) 64107A105 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate b

February 7, 2024 SC 13G/A

NPWR / NET Power Inc. / ADAGE CAPITAL PARTNERS GP, L.L.C. - NET POWER INC. Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 1)* NET Power Inc. (f/k/a Rice Acquisition Corp. II) (Name of Issuer) Class A Common Stock, par value $0.0001 per share (Title of Class of Securities) 64107A105 (CUSIP Number) December 31, 2023 (Date of Event Which Requires Filing of This Statement) Check the appropriat

November 14, 2023 10-Q

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) x 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 o 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

November 14, 2023 EX-99.1

NET Power Reports Third Quarter 2023 Results and Provides Business Update

NET Power Reports Third Quarter 2023 Results and Provides Business Update •Progressed Project Permian, the Company’s first Texas-based project located near Midland-Odessa •Continued site preparation and modifications at La Porte test facility ahead of multiple equipment testing campaigns with Baker Hughes Durham, NC – NET Power Inc.

November 14, 2023 424B3

NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK

PROSPECTUS SUPPLEMENT NO. 1 Filed pursuant to Rule 424(b)(3) (To prospectus dated September 25, 2023) Registration No. 333-273183 NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK This prospectus supplement is being filed to update and supplement the information contained in the prospectus dated September 25, 2023 (the “Prospec

November 14, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): November 14, 2023 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File N

September 25, 2023 424B3

NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK

Filed pursuant to Rule 424(b)(3) Registration No. 333-273183 NET POWER INC. 204,903,904 SHARES OF CLASS A COMMON STOCK 10,900,000 WARRANTS TO PURCHASE SHARES OF CLASS A COMMON STOCK This prospectus relates to the resale from time to time of 204,903,904 shares of our Class A common stock, par value $0.0001 per share (the “Class A Common Stock”), by the selling security holders named in this prospec

September 21, 2023 CORRESP

NET Power Inc. 404 Hunt Street, Suite 410 Durham, North Carolina 27701 September 21, 2023

NET Power Inc. 404 Hunt Street, Suite 410 Durham, North Carolina 27701 September 21, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, NE Washington, D.C. 20549 Attention: Alex King Erin Purnell Re: NET Power Inc. Registration Statement on Form S-1, as amended File No. 333-273183 Ladies and Gentlemen: Pursuant to R

September 15, 2023 CORRESP

NET Power Inc. 404 Hunt Street, Suite 410 Durham, North Carolina 27701 September 15, 2023

NET Power Inc. 404 Hunt Street, Suite 410 Durham, North Carolina 27701 September 15, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, NE Washington, D.C. 20549 Attention: Alex King Erin Purnell Re: NET Power Inc. Registration Statement on Form S-1 Filed on July 7, 2023 File No. 333-273183 Ladies and Gentlemen: Set

September 15, 2023 EX-21.1

Subsidiaries of the Company.

Exhibit 21.1 List of Subsidiaries of NET Power Inc. as of September 15, 2023 Name Jurisdiction of Incorporation or Organization NET Power Operations LLC (F/k/a Rice Acquisition Holdings II LLC) DE NET Power Intermediate LLC (F/k/a Topo Buyer Co, LLC) DE NET Power, LLC DE NET Power Atlas, LLC DE NET Power Canaveral, LLC DE NET Power Europe LTD United Kingdom NET Power Friendship 7, LLC DE NET Power

September 15, 2023 S-1/A

As filed with the Securities and Exchange Commission on September 15, 2023

As filed with the Securities and Exchange Commission on September 15, 2023 No. 333-273183 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 3620 98-1580612 (State or other jurisdiction of incorporation or organizati

September 15, 2023 EX-FILING FEES

Filing Fee Table.

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

August 25, 2023 EX-10.1

NET Power Inc. Executive Severance Plan (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed with the SEC on August 25, 2023)

NET POWER INC. EXECUTIVE SEVERANCE PLAN 1.Purpose. NET Power Inc. (the “Company”) has adopted the NET Power Inc. Executive Severance Plan (the “Plan”) to provide severance pay and benefits to eligible officers and management employees who are Eligible Executives (as defined below) and whose employment is terminated on or after August 21, 2023 (the “Effective Date”). The Plan is intended to be main

August 25, 2023 EX-10.2

Form of Executive Plan Participation Agreement (incorporated by reference to Exhibit 10.2 to the Company's Current Report on Form 8-K filed with the SEC on August 25, 2023)

[NET Power Inc. Letterhead] [Date] Re: Participation Agreement – NET Power Inc. Executive Severance Plan Dear []: We are pleased to inform you that you have been designated as eligible to participate in the NET Power Inc. Executive Severance Plan (as it may be amended from time to time, the “Plan”). Your participation in the Plan is subject to the terms and conditions of the Plan and your executio

August 25, 2023 8-K

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 Date of report (Date of earliest event reported): August 21, 2023 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Num

August 22, 2023 EX-FILING FEES

Filing Fee Table.

Exhibit 107 Calculation of Filing Fee Table Form S-8 (Form Type) NET Power Inc. (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Class A Common Stock, par value $0

August 22, 2023 S-8

As filed with the Securities and Exchange Commission on August 22, 2023

As filed with the Securities and Exchange Commission on August 22, 2023 Registration No.

August 14, 2023 EX-99.1

NET Power Reports Second Quarter 2023 Results and Provides Business Update

NET Power Reports Second Quarter 2023 Results and Provides Business Update •Completed business combination with Rice Acquisition Corp.

August 14, 2023 10-Q

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) x 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 o 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

August 14, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 14, 2023 NET POWER INC. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): August 14, 2023 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Num

July 11, 2023 DEL AM

NET Power Inc. 410 Hunt Street, Suite 410 Durham, North Carolina 27701 July 11, 2023

NET Power Inc. 410 Hunt Street, Suite 410 Durham, North Carolina 27701 July 11, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance 100 F Street, NE Washington, D.C. 20549 Re: NET Power Inc. Registration Statement on Form S-1 File No. 333-273183 Ladies and Gentlemen: Reference is made to the Registration Statement on Form S-1 (File No. 333-273183) filed

July 7, 2023 S-1

As filed with the Securities and Exchange Commission on July 7, 2023

As filed with the Securities and Exchange Commission on July 7, 2023 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 3620 98-1580612 (State or other jurisdiction of incorporation or organization) (Primary Standard Industria

July 7, 2023 EX-FILING FEES

Filing Fee Table.

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

June 30, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 29, 2023 NET POWER INC. (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 29, 2023 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Numbe

June 30, 2023 SC 13G/A

NPWR / NET Power Inc - Class A / Daniel J. Rice, IV 2018 Irrevocable Trust - AMENDMENT NO. 1 TO 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)* NET Power Inc. (Name of Issuer) Class A common stock, par value $0.0001 per share (Title of Class of Securities) 64107A 105 (CUSIP Number) June 30, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the ru

June 30, 2023 EX-16.1

Letter from WithumSmith + Brown, PC.

Exhibit 16.1 June 30, 2023 Office of the Chief Accountant Securities and Exchange Commission 100 F Street, NE Washington, D.C. 20549 Ladies and Gentlemen: We have read Net Power Inc’s (f/k/a Rice Acquisition Corp. II) statements included under Item 4.01 of its Form 8-K dated June 29, 2023. We agree with the statements concerning our Firm under Item 4.01(a), in which we were informed of our dismiss

June 20, 2023 EX-99.12

Joint Filing Agreement

Exhibit 12 Joint Filing Agreement In accordance with Rule 13d-1(k)(1)(iii) 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 Class A Common Stock, par value $0.

June 20, 2023 EX-7.1

Joint Filing Agreement

Exhibit 7.1 Joint Filing Agreement Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the “Exchange Act”), the undersigned hereby agree to the joint filing on behalf of each of them of any filing required by such party under Section 13 of the Exchange Act or any rule or regulation thereunder (including any amendment, restat

June 20, 2023 SC 13G

NPWR / NET Power Inc - Class A / Daniel J. Rice, IV 2018 Irrevocable Trust - 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. )* NET Power Inc. (Name of Issuer) Class A common stock, par value $0.0001 per share (Title of Class of Securities) 64107A 105 (CUSIP Number) June 8, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule

June 20, 2023 SC 13D

NPWR / NET Power Inc - Class A / OCCIDENTAL PETROLEUM CORP /DE/ - SC 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 NET Power Inc. (Name of Issuer) Class A common stock, par value $0.0001 (Title of Class of Securities) 64107A 105 (CUSIP Number) OLCV Net Power, LLC c/o Occidental Petroleum Corp. 5 Greenway Plaza, Suite 110 Houston, TX 77046 With copies to: A.J. Ericksen Emery Choi Scott

June 20, 2023 EX-1

Joint Filing Agreement dated as of June 20, 2023 by and among the Reporting Persons (filed herewith).

Exhibit 1 Joint Filing Agreement In accordance with Rule 13d-1(k) 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 common stock of NET Power Inc.

June 20, 2023 SC 13D

RONI / Rice Acquisition Corp II - Class A / CONSTELLATION ENERGY GENERATION LLC - SC 13D Activist Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D (Amendment No. )* NET Power Inc. (Name of Issuer) Class A Common Stock, Par Value $0.0001 per share (Title of Class of Securities) G75529100 (CUSIP Number) Constellation Energy Corporation 1310 Point Street Baltimore, Maryland 21231-3380 (833) 883-0162 Attn: Daniel L. Eggers and Constellation Energy Generation, LLC 200 Exelon W

June 20, 2023 SC 13D

NPWR / NET Power Inc - Class A / 8 Rivers Capital, LLC - SCHEDULE 13D Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D (Rule 13d-101) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO § 240.13d-2(a) (Amendment No. )* NET Power Inc. (Name of Issuer) Class A Common Stock, par value $0.0001 (Title of Class of Securities) 64107A105 (CUSIP Number) Cameron Hosie Chief Exec

June 14, 2023 EX-99.1

NET Power, LLC Consolidated Financial Statements As of and for the Three Months Ended March 31, 2023 and 2022 and as of the Year Ended December 31, 2022 NET Power, LLC Table of Contents

Exhibit 99.1 NET Power, LLC Consolidated Financial Statements As of and for the Three Months Ended March 31, 2023 and 2022 and as of the Year Ended December 31, 2022 NET Power, LLC Table of Contents Pages Consolidated Financial Statements: Consolidated Balance Sheets F-2 Consolidated Statements of Operations and Comprehensive Income (Loss) F-3 Consolidated Statements of Members’ Equity F-4 Consoli

June 14, 2023 EX-10.3

Tax Receivable Agreement, dated as of June 8, 2023, by and among NET Power Inc., NET Power Operations LLC, certain equityholders of NET Power Operations LLC and the Agent (as defined therein) (incorporated by reference to Exhibit 10.3 to the Company’s Current Report on Form 8-K filed with the SEC on June 14, 2023).

Exhibit 10.3 Execution Version TAX RECEIVABLE AGREEMENT by and among NET POWER INC., NET POWER OPERATIONS LLC, CERTAIN COMPANY UNITHOLDERS and THE AGENT DATED AS OF JUNE 8, 2023 Table of Contents Page Article I DEFINITIONS 2 Section 1.1 Definitions 2 Section 1.2 Other Definitional and Interpretative Provisions 10 Article II DETERMINATION OF CERTAIN REALIZED TAX BENEFITS 11 Section 2.1 Exchange Sch

June 14, 2023 EX-99.3

Management’s Discussion and Analysis of Financial Condition and Results of Operations of NET Power, LLC

Exhibit 99.3 Management’s Discussion and Analysis of Financial Condition and Results of Operations of NET Power, LLC The following discussion of our financial condition and results of operations should be read in conjunction with NET Power’s audited consolidated financial statements as of and for the years ended December 31, 2022 and 2021 included in the proxy statement/prospectus of NET Power Inc

June 14, 2023 EX-21.1

Subsidiaries of the Company.

Exhibit 21.1 List of Subsidiaries of NET Power Inc. as of June 8, 2023 Name Jurisdiction of Incorporation or Formation NET Power Operations LLC (F/k/a Rice Acquisition Holdings II LLC) DE NET Power Intermediate LLC (F/k/a Topo Buyer Co, LLC) DE NET Power, LLC DE NET Power Europe LTD United Kingdom NET Power Technology, LLC DE NET Power Atlas, LLC DE NET Power Canaveral, LLC DE NET Power Friendship

June 14, 2023 8-K

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

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): June 8, 2023 NET POWER INC. (Exact name of registrant as specified in its charter) Delaware 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commission File Number

June 14, 2023 EX-10.2

Second Amended and Restated Limited Liability Company Agreement of NET Power Operations LLC, dated as of June 8, 2023 (incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed with the SEC on June 14, 2023).

Exhibit 10.2 Execution Version SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF NET POWER OPERATIONS LLC DATED AS OF JUNE 8, 2023 THE LIMITED LIABILITY COMPANY INTERESTS IN NET POWER OPERATIONS LLC HAVE NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED, THE SECURITIES LAWS OF ANY STATE, OR ANY OTHER APPLICABLE SECURITIES LAWS, AND HAVE BEEN OR ARE BEING ISSUED

June 14, 2023 EX-10.4

Form of Indemnification Agreement for directors and executive officers of NET Power Inc. (incorporated by reference to Exhibit 10.4 to the Company’s Current Report on Form 8-K filed with the SEC on June 14, 2023)

Exhibit 10.4 Execution Version INDEMNIFICATION AGREEMENT THIS INDEMNIFICATION AGREEMENT (this “Agreement”) is made as of June 8, 2023, by and between NET POWER INC., a Delaware corporation (the “Company”), and the undersigned (“Indemnitee”). RECITALS WHEREAS, highly competent persons have become more reluctant to serve publicly held corporations as directors or officers unless they are provided wi

June 14, 2023 EX-3.1

Certificate of Incorporation of NET Power Inc. (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed with the SEC on June 14, 2023).

Exhibit 3.1 Execution Version CERTIFICATE OF INCORPORATION OF NET POWER INC. June 8, 2023 ARTICLE I NAME The name of the corporation is NET Power Inc. (the “Corporation”). ARTICLE II PURPOSE The purpose of the Corporation is to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the “DGCL”). The Corporation is bei

June 14, 2023 EX-99.2

UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.2 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION Defined terms included below have the same meaning as terms defined and included elsewhere in the Current Report on Form 8-K to which these financial statements are an exhibit (the “Form 8-K”) . The following unaudited pro forma condensed combined financial information is provided to aid you in your analysis of the financial

June 14, 2023 EX-3.2

Bylaws of NET Power Inc. (incorporated by reference to Exhibit 3.2 to the Company’s Current Report on Form 8-K filed with the SEC on June 14, 2023).

Exhibit 3.2 Final BYLAWS OF NET POWER INC. (THE “CORPORATION”) ARTICLE I OFFICES Section 1.1 Registered Office. The registered office of the Corporation within the State of Delaware shall be located at such place as shall be stated in the Certificate of Incorporation of the Corporation (as amended and/or restated, the “Certificate of Incorporation”) from time to time. Section 1.2 Additional Office

June 14, 2023 EX-10.1

Stockholders’ Agreement, dated as of June 8, 2023, by and among Rice Acquisition Corp. II, Rice Acquisition Holdings II LLC, Rice Acquisition Sponsor II LLC and the NET Power Holders (as defined therein) (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on June 14, 2023).

Exhibit 10.1 Execution Version STOCKHOLDERS’ AGREEMENT This Stockholders’ Agreement (this “Agreement”) is made as of June 8, 2023, by and among (a) the Stockholders listed on Schedule I hereto under “Initial NET Power Holders” (together with their respective Permitted Transferees (as defined below), the “NET Power Holders”); (b) Rice Acquisition Holdings II LLC, to be renamed as NET Power Operatio

June 14, 2023 EX-10.5

NET Power Inc. 2023 Omnibus Incentive Plan (incorporated by reference to Exhibit 10.5 to the Company’s Current Report on Form 8-K filed with the SEC on June 14, 2023)

Exhibit 10.5 Final NET POWER INC. 2023 OMNIBUS INCENTIVE PLAN ARTICLE I PURPOSE The purpose of this NET Power Inc. 2023 Omnibus Incentive Plan (this “Plan”) is to promote the success of the Company’s business for the benefit of its stockholders by enabling the Company to offer Eligible Individuals cash and stock-based incentives in order to attract, retain, and reward such individuals and strength

June 9, 2023 EX-99.25

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange hereby notifies the SEC of its intention to remove the entire class of the stated securities from listing and registration on the Exchange at the opening of business on June 20, 2023, pursuant to the provisions of Rule 12d2-2 (a).

June 7, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 6, 2023 RICE ACQUISI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 6, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation

June 5, 2023 425

* * * * * NET Power and Rice Acquisition Corp. II Announce Gross Proceeds of At Least $670 million and Expect to Close Business Combination on June 8, 2023

Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) On June 5, 2023, Rice Acquisition Corp. II (“RONI”) and NET Power, LLC (“NET Power”) issued the press release set forth below, and RONI pos

May 30, 2023 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): May 25, 2023 RICE ACQUISITION COR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): May 25, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commi

May 30, 2023 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): May 25, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commi

May 26, 2023 424B3

The date of this Supplement is May 26, 2023.

Filed Pursuant to Rule 424(b)(3) Registration Statement No. 333-268975 SUPPLEMENT NO. 1 (To the Proxy Statement/Prospectus dated May 10, 2023) This Supplement No. 1 (this “Supplement”) supplements the proxy statement/prospectus dated May 10, 2023 (the “Proxy Statement/Prospectus”) that was mailed by Rice Acquisition Corp. II, an exempted company incorporated in the Cayman Islands (“RONI”), to its

May 24, 2023 8-K

Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): May 18, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commi

May 24, 2023 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): May 18, 2023 RICE ACQUISITION COR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): May 18, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Commi

May 24, 2023 EX-10.1

SK PIPE Subscription Agreement

Exhibit 10.1 SUBSCRIPTION AGREEMENT Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 Ladies and Gentlemen: This Subscription Agreement (this “Subscription Agreement”) is being entered into as of the date set forth on the signature page hereto, by and between Rice Acquisition Corp. II, a Cayman Islands exempted company (“RONI”), which shall be domesticated a

May 24, 2023 EX-10.1

Subscription Agreement, dated as of May 18, 2023, by and between Rice Acquisition Corp. II and Tillandsia, Inc. (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on May 24, 2023).

Exhibit 10.1 SUBSCRIPTION AGREEMENT Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 Ladies and Gentlemen: This Subscription Agreement (this “Subscription Agreement”) is being entered into as of the date set forth on the signature page hereto, by and between Rice Acquisition Corp. II, a Cayman Islands exempted company (“RONI”), which shall be domesticated a

May 19, 2023 425

* * * * * NET Power and Rice Acquisition Corp. II Secure $50 Million PIPE Commitment from SK Group and Announce Intent to Form Joint Venture to Accelerate Deployment of NET Power Plants in Asia

Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) On May 19, 2023, Rice Acquisition Corp. II (“RONI”) and NET Power, LLC (“NET Power”) issued the press release set forth below, and RONI pos

May 12, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ 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 RICE ACQUISITION CORP. II (Exact name of registrant as

May 10, 2023 424B3

PROXY STATEMENT FOR EXTRAORDINARY GENERAL MEETING OF RICE ACQUISITION CORP. II PROSPECTUS FOR UP TO 199,845,063 SHARES OF COMMON STOCK AND 19,525,000 WARRANTS TO PURCHASE SHARES OF COMMON STOCK OF RICE ACQUISITION CORP. II (TO BE RENAMED “NET Power I

Filed Pursuant to Rule 424(b)(3) Registration Statement No. 333-268975 PROXY STATEMENT FOR EXTRAORDINARY GENERAL MEETING OF RICE ACQUISITION CORP. II PROSPECTUS FOR UP TO 199,845,063 SHARES OF COMMON STOCK AND 19,525,000 WARRANTS TO PURCHASE SHARES OF COMMON STOCK OF RICE ACQUISITION CORP. II (TO BE RENAMED “NET Power Inc.” FOLLOWING DOMESTICATION IN THE STATE OF DELAWARE AND IN CONNECTION WITH TH

May 9, 2023 S-4/A

As filed with the Securities and Exchange Commission on May 8, 2023

As filed with the Securities and Exchange Commission on May 8, 2023 No. 333-268975 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 5 to FORM S-4 UNDER THE SECURITIES ACT OF 1933 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands* 6770 98-1580612 (State or other jurisdiction of incorporation or organization) (Primary

May 8, 2023 CORRESP

Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 May 8, 2023

Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 May 8, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, NE Washington, D.C. 20549-3561 Attention: Erin Donahue and Evan Ewing Re: Rice Acquisition Corp. II Registration Statement on Form S-4, as amended File No. 333-268975 La

May 4, 2023 EX-99.1

Proxy Card for Extraordinary General Meeting.

Exhibit 99.1

May 4, 2023 S-4/A

As filed with the Securities and Exchange Commission on May 3, 2023

As filed with the Securities and Exchange Commission on May 3, 2023 No. 333-268975 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 4 to FORM S-4 UNDER THE SECURITIES ACT OF 1933 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands* 6770 98-1580612 (State or other jurisdiction of incorporation or organization) (Primary

May 4, 2023 EX-99.6

Consent of Eunkyung Sung to be named as a Director.

Exhibit 99.6 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquisi

April 24, 2023 EX-10.16

Ground Lease, dated as of April 14, 2015, by and between Air Liquide Large Industries U.S. LP and NET Power, LLC and Amendments No. One, Two, Three and Four thereto (incorporated by reference to Exhibit 10.16 to the Company’s Form S-4/A filed with the SEC on April 24, 2023).

Exhibit 10.16 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION IS BOTH (1) NOT MATERIAL AND (2) THE TYPE THAT THE REGISTRANT CUSTOMARILY TREATS AS PRIVATE OR CONFIDENTIAL Execution Copy GROUND LEASE Between AIR LIQUIDE LARGE INDUSTRIES U.S. LP As Landlord, and NET POWER, LLC As Tenant TABLE OF CONTENTS Page ARTICLE 1. DEFINIT

April 24, 2023 EX-2.1

BCA Amendment

Exhibit 2.1 Execution Version FIRST AMENDMENT TO THE BUSINESS COMBINATION AGREEMENT This First Amendment to the Business Combination Agreement (this “Amendment”), dated as of April 23, 2023 (the “Effective Date”), is by and among (i) Topo Buyer Co, LLC, a Delaware limited liability company, and (ii) NET Power, LLC, a Delaware limited liability company (collectively, the “Parties” and each, a “Part

April 24, 2023 S-4/A

Business Combination Agreement, dated as of December 13, 2022, by and among RONI, RONI Opco, Buyer, Merger Sub and NET Power (included as Annex A-1 to the proxy statement/prospectus forming a part of this Registration Statement).

As filed with the Securities and Exchange Commission on April 24, 2023 No. 333-268975 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 3 to FORM S-4 UNDER THE SECURITIES ACT OF 1933 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands* 6770 98-1580612 (State or other jurisdiction of incorporation or organization) (Prim

April 24, 2023 EX-10.1

Form of Stockholders Agreement

Exhibit 10.1 STOCKHOLDERS’ AGREEMENT This Stockholders’ Agreement (this “Agreement”) is made as of [●], 2023, by and among (a) the Stockholders listed on Schedule I hereto under “Initial NET Power Holders” (together with their respective Permitted Transferees (as defined below), the “NET Power Holders”); (b) Rice Acquisition Holdings II LLC, to be renamed as NET Power Operations LLC on the date he

April 24, 2023 CORRESP

Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 April 24, 2023

Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 April 24, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, NE Washington, D.C. 20549 Attention: Beverly Singleton Ernest Greene Erin Donahue Evan Ewing Re: Rice Acquisition Corp. II Amendment No. 2 to Registration Statement o

April 24, 2023 EX-10.2

Support Agreement Amendment

Exhibit 10.2 Execution Version FIRST AMENDMENT TO THE SUPPORT AGREEMENT This First Amendment to the Support Agreement (this “Amendment”), dated as of April 23, 2023 (the “Effective Date”), is by and among Rice Acquisition Corp. II, a Cayman Islands exempted company, Rice Acquisition Sponsor II LLC, a Delaware limited liability company, NET Power, LLC, a Delaware limited liability company, and the

April 24, 2023 EX-99.1

NET Power and Rice Acquisition Corp. II Announce Upsized PIPE Commitments from Occidental and Rice Family

Exhibit 99.1 NET Power and Rice Acquisition Corp. II Announce Upsized PIPE Commitments from Occidental and Rice Family Occidental and Rice family increase their PIPE investments by $275 million combined, bringing total committed capital to $510 million for the proposed transaction April 24, 2023 – NET Power, LLC (“NET Power”) and Rice Acquisition Corp. II (NYSE: RONI) (“RONI”) today announced an a

April 24, 2023 EX-99.6

Consent of Damian Beauchamp to be named as a Director.

Exhibit 99.6 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquisi

April 24, 2023 EX-99.8

Consent of Carol Peterson to be named as a Director.

Exhibit 99.8 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquisi

April 24, 2023 EX-99.9

Consent of Brad Pollack to be named as a Director.

Exhibit 99.9 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquisi

April 24, 2023 EX-10.2

First Amendment to the Support Agreement, dated April 23, 2023, by and among Rice Acquisition Corp. II, Rice Acquisition Sponsor II LLC, NET Power, LLC and the other persons whose names appear on the signature pages thereto (incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed with the SEC on April 24, 2023).

Exhibit 10.2 Execution Version FIRST AMENDMENT TO THE SUPPORT AGREEMENT This First Amendment to the Support Agreement (this “Amendment”), dated as of April 23, 2023 (the “Effective Date”), is by and among Rice Acquisition Corp. II, a Cayman Islands exempted company, Rice Acquisition Sponsor II LLC, a Delaware limited liability company, NET Power, LLC, a Delaware limited liability company, and the

April 24, 2023 EX-FILING FEES

Filing fee table.

Exhibit 107 Calculation of Filing Fee Tables Form S-4 (Form Type) Rice Acquisition Corp.

April 24, 2023 EX-99.2

Updated Illustrative Transaction Summary April 2023 Disclaimer (1/2) This presentation of Rice Acquisition Corp . II ("RONI") and NET Power, LLC ("NET Power") is for informational purposes only . This presentation does not constitute (i) a solicitati

Exhibit 99.2 Updated Illustrative Transaction Summary April 2023 Disclaimer (1/2) This presentation of Rice Acquisition Corp . II ("RONI") and NET Power, LLC ("NET Power") is for informational purposes only . This presentation does not constitute (i) a solicitation of a proxy, consent or authorization with respect to any securities or in respect of the business combination between RONI and NET Pow

April 24, 2023 EX-99.11

Consent of Frederick A. Forthuber to be named as a Director.

Exhibit 99.11 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquis

April 24, 2023 EX-10.1

Form of Stockholders Agreement

Exhibit 10.1 STOCKHOLDERS’ AGREEMENT This Stockholders’ Agreement (this “Agreement”) is made as of [●], 2023, by and among (a) the Stockholders listed on Schedule I hereto under “Initial NET Power Holders” (together with their respective Permitted Transferees (as defined below), the “NET Power Holders”); (b) Rice Acquisition Holdings II LLC, to be renamed as NET Power Operations LLC on the date he

April 24, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): April 23, 2023 RICE ACQUISITION C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): April 23, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Com

April 24, 2023 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): April 23, 2023 RICE ACQUISITION C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): April 23, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Com

April 24, 2023 EX-99.1

Proxy Card for Extraordinary General Meeting.

Exhibit 99.1 1

April 24, 2023 EX-10.17

Product Supply and Sales Agreement, dated as of July 1, 2015, by and between Air Liquide Large Industries U.S. LP and NET Power, LLC and Amendments No. One, Two and Three thereto (incorporated by reference to Exhibit 10.17 to the Company’s Form S-4/A filed with the SEC on April 24, 2023).

Exhibit 10.17 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION IS BOTH (1) NOT MATERIAL AND (2) THE TYPE THAT THE REGISTRANT CUSTOMARILY TREATS AS PRIVATE OR CONFIDENTIAL Execution Copy PRODUCT SUPPLY AND SALES AGREEMENT This Agreement is effective as of July 1, 2015 (“Effective Date”), and is by and between Air Liquide Large

April 24, 2023 EX-99.5

Consent of Peter J. (Jeff) Bennett to be named as a Director.

Exhibit 99.5 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquisi

April 24, 2023 EX-99.7

Consent of Joseph T. Kelliher to be named as a Director.

Exhibit 99.7 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquisi

April 24, 2023 EX-99.10

Consent of Alejandra Veltmann to be named as a Director.

Exhibit 99.10 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquis

April 24, 2023 EX-99.1

NET Power and Rice Acquisition Corp. II Announce Upsized PIPE Commitments from Occidental and Rice Family

Exhibit 99.1 NET Power and Rice Acquisition Corp. II Announce Upsized PIPE Commitments from Occidental and Rice Family Occidental and Rice family increase their PIPE investments by $275 million combined, bringing total committed capital to $510 million for the proposed transaction April 24, 2023 – NET Power, LLC (“NET Power”) and Rice Acquisition Corp. II (NYSE: RONI) (“RONI”) today announced an a

April 24, 2023 EX-4.4

Form of Certificate of Corporate Domestication of RONI, to be filed with the Secretary of the State of Delaware.

Exhibit 4.4 FORM OF CERTIFICATE OF CORPORATE DOMESTICATION OF rice acquisition Corp. ii Pursuant to Section 388 of the General Corporation Law of the State of Delaware (the “DGCL”) Rice Acquisition Corp. II, presently incorporated as a Cayman Islands exempted company, (the “Company”), DOES HEREBY CERTIFY: 1. The Company was first incorporated on February 2, 2021 under the laws of the Cayman Island

April 24, 2023 EX-99.4

Consent of Ralph Alexander to be named as a Director.

Exhibit 99.4 Consent to be Named as a Director Nominee In connection with the filing by Rice Acquisition Corp. II of the Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”), I hereby consent, pursuant to Rule 438 of the Securities Act, to being named as a nominee to the board of directors of Rice Acquisi

April 24, 2023 EX-99.2

Updated Illustrative Transaction Summary April 2023 Disclaimer (1/2) This presentation of Rice Acquisition Corp . II ("RONI") and NET Power, LLC ("NET Power") is for informational purposes only . This presentation does not constitute (i) a solicitati

Exhibit 99.2 Updated Illustrative Transaction Summary April 2023 Disclaimer (1/2) This presentation of Rice Acquisition Corp . II ("RONI") and NET Power, LLC ("NET Power") is for informational purposes only . This presentation does not constitute (i) a solicitation of a proxy, consent or authorization with respect to any securities or in respect of the business combination between RONI and NET Pow

April 24, 2023 EX-2.1

First Amendment to the Business Combination Agreement, dated as of April 23, 2023, by and among Topo Buyer Co, LLC and NET Power, LLC (incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K filed with the SEC on April 24, 2023).

Exhibit 2.1 Execution Version FIRST AMENDMENT TO THE BUSINESS COMBINATION AGREEMENT This First Amendment to the Business Combination Agreement (this “Amendment”), dated as of April 23, 2023 (the “Effective Date”), is by and among (i) Topo Buyer Co, LLC, a Delaware limited liability company, and (ii) NET Power, LLC, a Delaware limited liability company (collectively, the “Parties” and each, a “Part

March 21, 2023 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): March 21, 2023 RICE ACQUISITION C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): March 21, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Com

March 21, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): March 21, 2023 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Com

March 21, 2023 EX-99.1

NET Power Analyst Day March 2023 Disclaimer (1/2) This presentation is being delivered by Rice Acquisition Corp . II ("RONI") and NET Power, LLC ("NET Power") for informational purposes only . This presentation does not constitute (i) a solicitation

Exhibit 99.1 NET Power Analyst Day March 2023 Disclaimer (1/2) This presentation is being delivered by Rice Acquisition Corp . II ("RONI") and NET Power, LLC ("NET Power") for informational purposes only . This presentation does not constitute (i) a solicitation of a proxy, consent or authorization with respect to any securities or in respect of the business combination between RONI and NET Power

March 21, 2023 EX-99.1

NET Power Analyst Day March 2023 Disclaimer (1/2) This presentation is being delivered by Rice Acquisition Corp . II ("RONI") and NET Power, LLC ("NET Power") for informational purposes only . This presentation does not constitute (i) a solicitation

Exhibit 99.1 NET Power Analyst Day March 2023 Disclaimer (1/2) This presentation is being delivered by Rice Acquisition Corp . II ("RONI") and NET Power, LLC ("NET Power") for informational purposes only . This presentation does not constitute (i) a solicitation of a proxy, consent or authorization with respect to any securities or in respect of the business combination between RONI and NET Power

March 7, 2023 S-4/A

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

As filed with the Securities and Exchange Commission on March 6, 2023 No. 333-268975 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 2 to FORM S-4 UNDER THE SECURITIES ACT OF 1933 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands* 6770 98-1580612 (State or other jurisdiction of incorporation or organization) (Prima

March 7, 2023 EX-FILING FEES

Filing fee table.

Exhibit 107 Calculation of Filing Fee Tables Form S-4 (Form Type) Rice Acquisition Corp.

March 6, 2023 CORRESP

Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 March 6, 2023

Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 March 6, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, NE Washington, D.C. 20549 Attention: Beverly Singleton Ernest Greene Erin Donahue Evan Ewing Re: Rice Acquisition Corp. II Amendment No. 1 to Registration Statement on

March 2, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUA

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 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to RICE ACQUISITION CORP. II (Exact name of registrant

February 27, 2023 425

Episode Transcript

Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) On February 27, 2023, an interview with Daniel Joseph Rice, IV, a current director of Rice Acquisition Corp. II (“RONI”), was published on

February 14, 2023 EX-99.1

JOINT FILING AGREEMENT February 14, 2023

EXHIBIT 99.1 JOINT FILING AGREEMENT February 14, 2023 Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the rules and regulations thereunder, each party hereto hereby agrees to the joint filing, on behalf of each of them, of any filing required by such party under Section 13 or Section 16 of the Exchange Act or any rule or regulation there

February 14, 2023 SC 13G/A

RONI / Rice Acquisition Corp. II / RP Investment Advisors LP - AMENDMENT NO. 1 TO 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)* Rice Acquisition Corp. II (Name of Issuer) Class A ordinary shares, $0.0001 par value (Title of Class of Securities) G75529100 (CUSIP Number) December 31, 2022 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate

February 14, 2023 SC 13G/A

RONI / Rice Acquisition Corp. II / KENSICO CAPITAL MANAGEMENT CORP - SC 13G/A Passive Investment

SC 13G/A 1 s13g123122-riceacqii.htm SC 13G/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b),(c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. 1) * Rice Acquisition Corp. II (Name of Issuer) Class A Ordi

February 14, 2023 SC 13G

RONI / Rice Acquisition Corp. II / ARISTEIA CAPITAL LLC Passive Investment

SC 13G 1 sc13griceacquisitioncorp.htm UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. *) Rice Acquisition Corp. II (Name of Issuer) Class A ordinary shares, par value $0.0001 per share (Title of Class of Securities) G75529100 (CUSIP Number) December 31, 2022 (Date of Event Which Requires Filing of this Stat

February 2, 2023 EX-10.12

Amended and Restated License Agreement, dated as of August 7, 2014, by and between NET Power, LLC and 8 Rivers Capital, LLC (incorporated by reference to Exhibit 10.12 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.12 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION IS BOTH (1) NOT MATERIAL AND (2) THE TYPE THAT THE REGISTRANT CUSTOMARILY TREATS AS PRIVATE OR CONFIDENTIAL. FINAL AMENDED AND RESTATED LICENSE AGREEMENT by and between NET POWER, LLC and 8 RIVERS CAPITAL, LLC AUGUST 7, 2014 TABLE OF CONTENTS Page 1. DEFINITIONS.

February 2, 2023 EX-10.21

Side Letter, dated as of December 2, 2022, by and between NET Power, LLC and Ron DeGregorio (incorporated by reference to Exhibit 10.21 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.21 December 2, 2022 Mr. Ron DeGregorio 9096 SE Harbor Island Way Hobe Sound FL 33455 RONI Transaction – Market Adjustment Payment Dear Ron: Reference is made to that certain Amended and Restated Profits Interest Share Award Agreement dated on or about the date hereof between NET Power, LLC (the “Company”) and you (the “Profits Interest Agreement”). Capitalized terms used herein have the

February 2, 2023 EX-10.13

Amended and Restated Joint Development Agreement, dated as of December 13, 2022, by and among NET Power, LLC, Nuovo Pignone International, S.r.l., Nuovo Pignone Tecnologie S.r.l., Rice Acquisition Holdings II LLC and Rice Acquisition Corp. II (incorporated by reference to Exhibit 10.13 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.13 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION IS BOTH (1) NOT MATERIAL AND (2) THE TYPE THAT THE REGISTRANT CUSTOMARILY TREATS AS PRIVATE OR CONFIDENTIAL. Confidential – Subject to the confidentiality provisions of this Joint Development Agreement AMENDED AND RESTATED JOINT DEVELOPMENT AGREEMENT This AMENDED

February 2, 2023 EX-10.25

Service Provider Agreement, dated as of March 31, 2022, by and between NET Power, LLC and Brian Allen (incorporated by reference to Exhibit 10.25 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.25 - Confidential - Service Provider Agreement This Service Provider Agreement (the “Agreement”) is made and entered into as of the Effective Date, by and between the identified Service Provider and NET Power, LLC, a Delaware limited liability company (the “Company”). Service Provider and the Company may be referred to individual as a “party” or collectively as the “parties.” “Service P

February 2, 2023 EX-10.22

Service Provider Agreement, dated as of October 4, 2021, by and between NET Power, LLC and Akash Patel (incorporated by reference to Exhibit 10.22 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.22 Service Provider Agreement This Service Provider Agreement (the “Agreement”) is made and entered into as of the Effective Date, by and between the identified Service Provider and NET Power, LLC, a Delaware limited liability company (the “Company”). Service Provider and the Company may be referred to individual as a “party” or collectively as the “parties.” “Service Provider” Service

February 2, 2023 EX-10.17

Service Provider Agreement, dated as of October 1, 2021, by and between NET Power, LLC and Ron DeGregorio (incorporated by reference to Exhibit 10.17 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.17 Service Provider Agreement This Service Provider Agreement (the “Agreement”) is made and entered into as of the Effective Date, by and between the identified Service Provider and NET Power, LLC, a Delaware limited liability company (the “Company”). Service Provider and the Company may be referred to individual as a “party” or collectively as the “parties.” “Service Provider” Service

February 2, 2023 S-4/A

As filed with the Securities and Exchange Commission on February 2, 2023

As filed with the Securities and Exchange Commission on February 2, 2023 No. 333-268975 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to FORM S-4 UNDER THE SECURITIES ACT OF 1933 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands* 6770 98-1580612 (State or other jurisdiction of incorporation or organization) (Pr

February 2, 2023 EX-10.18

Profits Interest Share Award Agreement, dated as of October 1, 2021, by and between NET Power, LLC and Ron DeGregorio (incorporated by reference to Exhibit 10.18 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.18 NET Power, LLC 406 Blackwell Street 4th Floor, Crowe Building Durham, NC 27701 +1 919 667-1800 NET Power, LLC Profits Interest Share Award Agreement This Profits Interest Share Award Agreement (the “Agreement”), made effective as of the Sept. 30, 2021 (the “Effective Date”), between NET Power, LLC, a limited liability company organized pursuant to the Delaware Limited Liability Compa

February 2, 2023 EX-10.26

Profits Interest Share Award Agreement, dated as of March 31, 2022, by and between NET Power, LLC and Brian Allen (incorporated by reference to Exhibit 10.26 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.26 NET Power, LLC 406 Blackwell Street 4th Floor, Crowe Building Durham, NC 27701 +1 919 667-1800 NET Power, LLC Profits Interest Share Award Agreement This Profits Interest Share Award Agreement (the “Agreement”), made effective as of the April 18, 2022 (the “Effective Date”), between NET Power, LLC, a limited liability company organized pursuant to the Delaware Limited Liability Compa

February 2, 2023 EX-10.19

Amendment to the Service Provider Agreement and Profits Interest Share Agreement, dated as of April 28, 2022, by and between NET Power, LLC and Ron DeGregorio (incorporated by reference to Exhibit 10.19 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.19 NET Power, LLC 406 Blackwell Street 4th Floor, Crowe Building Durham, NC 27701 +1 919 667-1800 NET Power, LLC Amendments to Service Provider Agreement and to the Profits Interest Share Award Agreement of Ron DeGregorio This Amendment to (1) the Service Provider Agreement, and (2) to the Profits Interest Share Award Agreement of Ron DeGregorio (the “Amendment”), made effective as of t

February 2, 2023 EX-10.14

License Agreement, dated as of February 3, 2022, by and between NET Power, LLC and Nuovo Pignone Tecnologie S.r.l., as amended to date (incorporated by reference to Exhibit 10.14 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.14 CERTAIN CONFIDENTIAL INFORMATION CONTAINED IN THIS DOCUMENT, MARKED BY BRACKETS, HAS BEEN OMITTED BECAUSE THE INFORMATION IS BOTH (1) NOT MATERIAL AND (2) THE TYPE THAT THE REGISTRANT CUSTOMARILY TREATS AS PRIVATE OR CONFIDENTIAL. Execution Copy License Agreement This License Agreement (including as it may be amended or modified in accordance with its terms, the “Agreement”), is ente

February 2, 2023 CORRESP

Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 February 2, 2023

Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 February 2, 2023 VIA EDGAR United States Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, NE Washington, D.C. 20549 Attention: Beverly Singleton Ernest Greene Erin Donahue Evan Ewing Re: Rice Acquisition Corp. II Registration Statement on Form S-4 Filed

February 2, 2023 EX-10.24

Amendment to the Service Provider Agreement and Profits Interest Share Agreement, dated as of April 27, 2022, by and between NET Power, LLC and Akash Patel (incorporated by reference to Exhibit 10.24 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.24 NET Power, LLC 406 Blackwell Street 4th Floor, Crowe Building Durham, NC 27701 +1 919 667-1800 NET Power, LLC Amendments to Service Provider Agreement and to the Consolidated Profits Interest Share Award Agreement of Akash Patel This Amendment to (1) the Service Provider Agreement, and (2) to the Consolidated Profits Interest Share Award Agreement of Akash Patel (the “Amendment”), ma

February 2, 2023 EX-10.20

Second Amendment to the Service Provider Agreement and Profits Interest Share Agreement, dated as of December 5, 2022, by and between NET Power, LLC and Ron DeGregorio (incorporated by reference to Exhibit 10.20 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.20 EXECUTION COPY NET Power, LLC Second Amendment to Service Provider Agreement and to the Profits Interest Share Award Agreement of Ron DeGregorio This Second Amendment to (1) the Service Provider Agreement, and (2) to the Profits Interest Share Award Agreement of Ron DeGregorio (the “Second Amendment”), made effective as of the date of completion of signing, below (the “Effective Date

February 2, 2023 EX-10.23

Profits Interest Share Award Agreement, dated as of October 4, 2021, by and between NET Power, LLC and Akash Patel (incorporated by reference to Exhibit 10.23 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.23 NET Power, LLC 406 Blackwell Street 4th Floor, Crowe Building Durham, NC 27701 +1 919 667-1800 NET Power, LLC Consolidated Profits Interest Share Award Agreement of Akash Patel This Consolidated Profits Interest Share Award Agreement (the “Agreement”), made effective as of the Sept. 30, 2021 (the “Effective Date”), between NET Power, LLC, a limited liability company organized pursuan

February 2, 2023 EX-10.27

Amendment to the Service Provider Agreement and Profits Interest Share Agreement, dated as of May 2, 2022, by and between NET Power, LLC and Brian Allen (incorporated by reference to Exhibit 10.27 to the Company’s Form S-4/A filed with the SEC on February 2, 2023).

Exhibit 10.27 NET Power, LLC 406 Blackwell Street 4th Floor, Crowe Building Durham, NC 27701 +1 919 667-1800 NET Power, LLC Amendments to Service Provider Agreement and to the Consolidated Profits Interest Share Award Agreement of Brian Allen This Amendment to (1) the Service Provider Agreement, and (2) to the Profits Interest Share Award Agreement of Brian Allen (the “Amendment”), made effective

January 27, 2023 425

“Net Power Brings The World Clean, Cost Effective, Reliable, And Dispatchable Utility-Scale Energy” – CEO Ron DeGregorio

Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) On January 26, 2023, an interview with Ron DeGregorio, current Chief Executive Officer of NET Power, LLC (“NET Power”), was published on Ca

January 17, 2023 425

****

Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) In connection with the proposed business combination involving Rice Acquisition Corp. II (“RONI”) and NET Power, LLC (“NET Power”), on Janu

January 4, 2023 425

Episode Transcription

425 1 ea171223-425riceacq2.htm FORM 425 Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) On January 4, 2023, an interview with Daniel Joseph Rice, IV, a current director of Rice Acquisitio

December 23, 2022 S-4

As filed with the Securities and Exchange Commission on December 22, 2022

As filed with the Securities and Exchange Commission on December 22, 2022 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-4 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands* 6770 98-1580612 (State or other jurisdiction of incorporation or organization) (Pri

December 23, 2022 EX-FILING FEES

Filing fee table.

Exhibit 107 Calculation of Filing Fee Tables Form S-4 ????.. (Form Type) Rice Acquisition Corp. II ????????????????????..? (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fe

December 23, 2022 EX-21.1

List of Subsidiaries of RONI.

Exhibit 21.1 Subsidiaries of Rice Acquisition Corp. II Set forth below is a list of subsidiaries of Rice Acquisition Corp. II and their respective place of incorporation. Name of Subsidiary Place of Incorporation Rice Acquisition Holdings II LLC Cayman Islands

December 23, 2022 EX-99.2

Consent of Daniel Joseph Rice, IV to be named as a Director.

Exhibit 99.2 DIRECTOR CONSENT I hereby consent to serve as a director of Rice Acquisition Corp. II (the ?Company?), if elected as such, and to be named as a nominee or potential nominee for director of the Company in any registration statement filed by the Company under the Securities Act of 1933, as amended, including all amendments and post-effective amendments or supplements thereto and any pro

December 23, 2022 EX-99.3 VOTING TRUST

Consent of J. Kyle Derham to be named as a Director.

Exhibit 99.3 DIRECTOR CONSENT I hereby consent to serve as a director of Rice Acquisition Corp. II (the ?Company?), if elected as such, and to be named as a nominee or potential nominee for director of the Company in any registration statement filed by the Company under the Securities Act of 1933, as amended, including all amendments and post-effective amendments or supplements thereto and any pro

December 20, 2022 425

* * * * *

Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) On December 20, 2022, Rice Acquisition Corp. II (?RONI?) posted the following articles on its corporate website. Rice Acquisition Corp. II

December 15, 2022 425

2

Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) The following is an article which was originally published by Forbes on December 14, 2022, which contains quotes from Daniel Rice, a curren

December 14, 2022 EX-10.1

Sponsor Letter Agreement

Exhibit 10.1 SPONSOR LETTER AGREEMENT This SPONSOR LETTER AGREEMENT (this ?Agreement?), dated as of December 13, 2022, is made by and among Rice Acquisition Sponsor II LLC, a Delaware limited liability company (?Sponsor?), Rice Acquisition Corp. II (?RONI? and, following the Closing, the ?Public Company?), Rice Acquisition Holdings II, LLC (?RONI Holdings?), NET Power, LLC, a Delaware limited liab

December 14, 2022 EX-99.3

Rice Acquisition Corp II (NYSE: RONI) Business Combination with NET Power Investor Call Transcript December 14, 2022

Exhibit 99.3 Rice Acquisition Corp II (NYSE: RONI) Business Combination with NET Power Investor Call Transcript December 14, 2022 Legend: RONI = Rice Acquisition Corp II NPWR = NET Power LLC Speakers: Daniel Rice IV: Board Member, RONI and incoming Chief Executive Officer, NPWR Ron DeGregorio: current Chief Executive Officer, NPWR Kyle Derham: Chief Executive Officer, RONI and incoming Board Membe

December 14, 2022 EX-10.5

Form of Tax Receivables Agreement

Exhibit 10.5 FORM OF TAX RECEIVABLE AGREEMENT by and among [RICE ACQUISITION CORP. II], [RICE ACQUISITION HOLDINGS II LLC], [CERTAIN COMPANY UNITHOLDERS]1 and THE AGENT DATED AS OF [?], 2023 1 Note to Draft: Names to be updated based on renaming conventions for entities prior to Closing. Table of Contents Page Article I DEFINITIONS 2 Section 1.1 Definitions 2 Section 1.2 Other Definitional and Int

December 14, 2022 EX-10.2

Support Agreement, dated December 13, 2022, between Rice Acquisition Corp. II, Rice Acquisition Sponsor II LLC, NET Power, LLC and the other persons whose names appear on the signature pages thereto (incorporated by reference to Exhibit 10.2 to the Company’s Current Report on Form 8-K filed with the SEC on December 14, 2022).

Exhibit 10.2 Execution Version SUPPORT AGREEMENT This Support Agreement (this ?Agreement?) is made and entered into as of December 13, 2022, by and among Rice Acquisition Corp. II, a Cayman Islands exempted company (?RONI?), Rice Acquisition Sponsor II LLC, a Delaware limited liability company (?Sponsor?), NET Power, LLC, a Delaware limited liability company (the ?Company?), and the other Persons

December 14, 2022 EX-99.3

Rice Acquisition Corp II (NYSE: RONI) Business Combination with NET Power Investor Call Transcript December 14, 2022

Exhibit 99.3 Rice Acquisition Corp II (NYSE: RONI) Business Combination with NET Power Investor Call Transcript December 14, 2022 Legend: RONI = Rice Acquisition Corp II NPWR = NET Power LLC Speakers: Daniel Rice IV: Board Member, RONI and incoming Chief Executive Officer, NPWR Ron DeGregorio: current Chief Executive Officer, NPWR Kyle Derham: Chief Executive Officer, RONI and incoming Board Membe

December 14, 2022 425

Gas Mogul Daniel Rice to Invest in Clean-Energy Firm NET

Filed by Rice Acquisition Corp. II pursuant to Rule 425 under the Securities Act of 1933, as amended, and deemed filed pursuant to Rule 14a-12 under the Securities Exchange Act of 1934, as amended Subject Company: Rice Acquisition Corp. II (File No. 001-40503) The following is an article which was originally published by Bloomberg News on December 14, 2022, which contains quotes from Daniel Rice,

December 14, 2022 EX-10.5

Form of Tax Receivables Agreement

Exhibit 10.5 FORM OF TAX RECEIVABLE AGREEMENT by and among [RICE ACQUISITION CORP. II], [RICE ACQUISITION HOLDINGS II LLC], [CERTAIN COMPANY UNITHOLDERS]1 and THE AGENT DATED AS OF [?], 2023 1 Note to Draft: Names to be updated based on renaming conventions for entities prior to Closing. Table of Contents Page Article I DEFINITIONS 2 Section 1.1 Definitions 2 Section 1.2 Other Definitional and Int

December 14, 2022 EX-10.2

Support Agreement

Exhibit 10.2 Execution Version SUPPORT AGREEMENT This Support Agreement (this ?Agreement?) is made and entered into as of December 13, 2022, by and among Rice Acquisition Corp. II, a Cayman Islands exempted company (?RONI?), Rice Acquisition Sponsor II LLC, a Delaware limited liability company (?Sponsor?), NET Power, LLC, a Delaware limited liability company (the ?Company?), and the other Persons

December 14, 2022 EX-10.3

Form of Subscription Agreement

Exhibit 10.3 FORM OF SUBSCRIPTION AGREEMENT Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 Ladies and Gentlemen: This Subscription Agreement (this ?Subscription Agreement?) is being entered into as of the date set forth on the signature page hereto, by and between Rice Acquisition Corp. II, a Cayman Islands exempted company (?RONI?), which shall be domest

December 14, 2022 EX-10.1

Sponsor Letter Agreement, dated as of December 13, 2022, by and among Rice Acquisition Corp. II, Rice Acquisition Sponsor II LLC, Rice Acquisition Holdings II LLC, NET Power, LLC and the members of the board of directors or management of Rice Acquisition Corp. II (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on December 14, 2022).

Exhibit 10.1 SPONSOR LETTER AGREEMENT This SPONSOR LETTER AGREEMENT (this ?Agreement?), dated as of December 13, 2022, is made by and among Rice Acquisition Sponsor II LLC, a Delaware limited liability company (?Sponsor?), Rice Acquisition Corp. II (?RONI? and, following the Closing, the ?Public Company?), Rice Acquisition Holdings II, LLC (?RONI Holdings?), NET Power, LLC, a Delaware limited liab

December 14, 2022 EX-10.6

Form of Amended & Restated LLC Agreement

Exhibit 10.6 Final Form FORM OF SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF [RICE ACQUISITION HOLDINGS II LLC]1 DATED AS OF [?], 2023 THE LIMITED LIABILITY COMPANY INTERESTS IN [RICE ACQUISITION HOLDINGS II LLC] HAVE NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED, THE SECURITIES LAWS OF ANY STATE, OR ANY OTHER APPLICABLE SECURITIES LAWS, AND HAVE BEEN

December 14, 2022 EX-2.1

Business Combination Agreement

Exhibit 2.1 Execution Version Business Combination AGREEMENT by and among RICE ACQUISITION CORP. II, RICE ACQUISITION HOLDINGS II LLC, TOPO Buyer Co, LLC, TOPO Merger Sub, LLC and NET POWER, LLC, Dated as of DECEMBER 13, 2022 TABLE OF CONTENTS Page Article I CERTAIN DEFINITIONS 4 Section 1.1 Certain Definitions 4 Article II THE MERGER; CLOSING 25 Section 2.1 Closing Transactions; Merger 25 Section

December 14, 2022 EX-99.1

NET Power to Combine with Rice Acquisition Corp. II to Accelerate Decarbonization of Natural Gas Power Generation

Exhibit 99.1 NET Power to Combine with Rice Acquisition Corp. II to Accelerate Decarbonization of Natural Gas Power Generation ? NET Power?s proven technology generates near zero-emissions utility-scale power, delivering the world?s first scalable solution that achieves the energy trifecta: clean, reliable, low-cost power. ? Implied pro forma enterprise value of $1.459 billion and will be publicly

December 14, 2022 425

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): December 13, 2022 RICE ACQUISITIO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): December 13, 2022 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (

December 14, 2022 8-K

Regulation FD Disclosure, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): December 13, 2022 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (

December 14, 2022 EX-99.2

NET Power PIPE Presentation December 2022 Disclaimer (1/2) This presentation is being furnished solely for the purpose of considering a potential transaction involving Rice Acquisition Corp. II (“RONI”) and NET Power, LLC (“NET Power”). By accepting

Exhibit 99.2 NET Power PIPE Presentation December 2022 Disclaimer (1/2) This presentation is being furnished solely for the purpose of considering a potential transaction involving Rice Acquisition Corp. II (?RONI?) and NET Power, LLC (?NET Power?). By accepting this presentation, the recipient acknowledges and agrees that all of the information contained herein is confidential, that the recipient

December 14, 2022 EX-2.1

Business Combination Agreement, dated as of December 13, 2022, by and among Rice Acquisition Corp. II, Rice Acquisition Holdings II LLC, Topo Buyer Co, LLC, Topo Merger Sub, LLC and NET Power, LLC (incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K filed with the SEC on December 14, 2022).

Exhibit 2.1 Execution Version Business Combination AGREEMENT by and among RICE ACQUISITION CORP. II, RICE ACQUISITION HOLDINGS II LLC, TOPO Buyer Co, LLC, TOPO Merger Sub, LLC and NET POWER, LLC, Dated as of DECEMBER 13, 2022 TABLE OF CONTENTS Page Article I CERTAIN DEFINITIONS 4 Section 1.1 Certain Definitions 4 Article II THE MERGER; CLOSING 25 Section 2.1 Closing Transactions; Merger 25 Section

December 14, 2022 EX-99.1

NET Power to Combine with Rice Acquisition Corp. II to Accelerate Decarbonization of Natural Gas Power Generation

Exhibit 99.1 NET Power to Combine with Rice Acquisition Corp. II to Accelerate Decarbonization of Natural Gas Power Generation ? NET Power?s proven technology generates near zero-emissions utility-scale power, delivering the world?s first scalable solution that achieves the energy trifecta: clean, reliable, low-cost power. ? Implied pro forma enterprise value of $1.459 billion and will be publicly

December 14, 2022 EX-10.6

Form of Amended & Restated LLC Agreement

Exhibit 10.6 Final Form FORM OF SECOND AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF [RICE ACQUISITION HOLDINGS II LLC]1 DATED AS OF [?], 2023 THE LIMITED LIABILITY COMPANY INTERESTS IN [RICE ACQUISITION HOLDINGS II LLC] HAVE NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED, THE SECURITIES LAWS OF ANY STATE, OR ANY OTHER APPLICABLE SECURITIES LAWS, AND HAVE BEEN

December 14, 2022 EX-10.3

Form of Subscription Agreement, dated as of December 13, 2022, by and between Rice Acquisition Corp. II and the subscriber named therein (incorporated by reference to Exhibit 10.3 to the Company’s Current Report on Form 8-K filed with the SEC on December 14, 2022).

Exhibit 10.3 FORM OF SUBSCRIPTION AGREEMENT Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 Ladies and Gentlemen: This Subscription Agreement (this ?Subscription Agreement?) is being entered into as of the date set forth on the signature page hereto, by and between Rice Acquisition Corp. II, a Cayman Islands exempted company (?RONI?), which shall be domest

December 14, 2022 EX-99.2

NET Power PIPE Presentation December 2022 Disclaimer (1/2) This presentation is being furnished solely for the purpose of considering a potential transaction involving Rice Acquisition Corp. II (“RONI”) and NET Power, LLC (“NET Power”). By accepting

Exhibit 99.2 NET Power PIPE Presentation December 2022 Disclaimer (1/2) This presentation is being furnished solely for the purpose of considering a potential transaction involving Rice Acquisition Corp. II (?RONI?) and NET Power, LLC (?NET Power?). By accepting this presentation, the recipient acknowledges and agrees that all of the information contained herein is confidential, that the recipient

December 14, 2022 EX-10.4

Form of Stockholders Agreement

Exhibit 10.4 FORM OF STOCKHOLDERS? AGREEMENT This Stockholders? Agreement (this ?Agreement?) is made as of [?], 2023, by and among (a) the Stockholders listed on Schedule I hereto under ?Initial NET Power Holders? (together with their respective Permitted Transferees (as defined below), the ?NET Power Holders?); (b) Rice Acquisition Holdings II LLC, to be renamed as [?] on the date hereof (?OpCo?)

December 14, 2022 EX-10.4

Form of Stockholders Agreement

Exhibit 10.4 FORM OF STOCKHOLDERS? AGREEMENT This Stockholders? Agreement (this ?Agreement?) is made as of [?], 2023, by and among (a) the Stockholders listed on Schedule I hereto under ?Initial NET Power Holders? (together with their respective Permitted Transferees (as defined below), the ?NET Power Holders?); (b) Rice Acquisition Holdings II LLC, to be renamed as [?] on the date hereof (?OpCo?)

November 10, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? 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 RICE ACQUISITION CORP. II (Exact name of registran

August 15, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to RICE ACQUISITION CORP. II (Exact name of registrant as

June 22, 2022 SC 13G

RONI / Rice Acquisition Corp. II / RP Investment Advisors LP - 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. )* Rice Acquisition Corp. II (Name of Issuer) Class A ordinary shares, $0.0001 par value (Title of Class of Securities) G75529100 (CUSIP Number) June 13, 2022 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the

June 22, 2022 EX-99.1

JOINT FILING AGREEMENT June 22, 2022

EXHIBIT 99.1 JOINT FILING AGREEMENT June 22, 2022 Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended (the ?Exchange Act?), and the rules and regulations thereunder, each party hereto hereby agrees to the joint filing, on behalf of each of them, of any filing required by such party under Section 13 or Section 16 of the Exchange Act or any rule or regulation thereunde

May 11, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to RICE ACQUISITION CORP. II (Exact name of registrant as

March 30, 2022 EX-4.5

Description of Registrant’s Securities.*

Exhibit 4.5 DESCRIPTION OF SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following summary of the material terms of the securities of Rice Acquisition Corp. II (?we,? ?us,? ?our? or the ?company?) is not intended to be a complete summary of the rights and preferences of such securities and is subject to and qualified by reference to our amended and restate

March 30, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ☐ TRANSITION REPORT PURSUA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to RICE ACQUISITION CORP. II (Exact name of registrant

March 3, 2022 10-Q/A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A Amendment No. 1 ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 ☐ TRANSITI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q/A Amendment No. 1 ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to RICE ACQUISITION CORP. II (Exact

February 24, 2022 8-K

Non-Reliance on Previously Issued Financial Statements or a Related Audit Report or Completed Interim Review

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): February 24, 2022 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (

February 22, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K Current Report Pursuant to Section 13 or 15(d) of the securities exchange act of 1934 Date of Report (Date of earliest event reported): February 21, 2022 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (

February 14, 2022 SC 13G

RONI / Rice Acquisition Corp. II / KENSICO CAPITAL MANAGEMENT CORP - SCH 13G Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1(b),(c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. ) * Rice Acquisition Corp. II (Name of Issuer) Class A Ordinary Shares, $.0001 par value (Title of Class

February 11, 2022 SC 13G

RONI / Rice Acquisition Corp. II / Rice Acquisition Sponsor II LLC - 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. )* Rice Acquisition Corp. II (Name of Issuer) Class A ordinary shares, par value $0.0001 per share (Title of Class of Securities) G75529 100 (CUSIP Number) December 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to

November 12, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to RICE ACQUISITION CORP. II (Exact name of registran

August 12, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 ☐ TRANSITION REPORT PURSUANT TO S

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to RICE ACQUISITION CORP. II (Exact name of registrant as

August 6, 2021 8-K

Other Events, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 6, 2021 RICE ACQUISITION CORP. II (Exact Name of Registrant as Specified in its Charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction of incorporation) (Com

August 6, 2021 EX-99.1

Rice Acquisition Corp. II Announces the Separate Trading of its Class A Ordinary Shares and Warrants, Commencing August 6, 2021

Exhibit 99.1 Rice Acquisition Corp. II Announces the Separate Trading of its Class A Ordinary Shares and Warrants, Commencing August 6, 2021 CARNEGIE, Pennsylvania, August 6, 2021 ? Rice Acquisition Corp. II (NYSE: RONI U) (the ?Company?) announced that, commencing August 6, 2021, holders of the units sold in the Company?s initial public offering may elect to separately trade the Class A ordinary

July 30, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 ☐ TRANSITION REPORT PURSUANT TO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to RICE ACQUISITION CORP. II (Exact name of registrant as

June 28, 2021 SC 13G

RONI / Rice Acquisition Corp. II / ADAGE CAPITAL PARTNERS GP, L.L.C. - RICE ACQUISITION CORP. II Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* Rice Acquisition Corp. II (Name of Issuer) Class A Ordinary Shares, par value $0.0001 per share (Title of Class of Securities) G75529118** (CUSIP Number) June 18, 2021 (Date of Event Which Requires Filing of This Statement) Check the appropriate box to designate the ru

June 24, 2021 EX-99.1

RICE ACQUISITION CORP. II

Exhibit 99.1 RICE ACQUISITION CORP. II Report of Independent Registered Public Accounting Firm F-2 Consolidated Balance Sheet as of June 18, 2021 F-3 Notes to Consolidated Financial Statement F-4 Report of Independent Registered Public Accounting Firm To the Shareholders and the Board of Directors of Rice Acquisition Corp. II Opinion on the Consolidated Financial Statement We have audited the acco

June 24, 2021 8-K

Other Events, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 18, 2021 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction (Commission File Number

June 21, 2021 EX-10.4

Administrative Services Agreement, dated as of June 15, 2021, between RONI, RONI Opco and Sponsor (incorporated by reference to Exhibit 10.4 to the Current Report on Form 8-K filed by the Registrant on June 21, 2021).

Exhibit 10.4 RICE ACQUISITION CORP. II RICE ACQUISITION HOLDINGS II LLC 102 East Main Street, Second Story Carnegie, PA 15106 June 15, 2021 Rice Acquisition Sponsor II LLC 102 East Main Street, Second Story Carnegie, PA 15106 Re: Administrative Services Agreement Gentlemen: This letter agreement by and between Rice Acquisition Corp. II (the ?Company?), Rice Acquisition Holdings II LLC (?Opco?) and

June 21, 2021 EX-3.1

Amended and Restated Memorandum and Articles of Association, dated June 15, 2021, of the Company (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K (File No. 001-40503) filed with the SEC on June 21, 2021).

Exhibit 3.1 THE COMPANIES ACT (As Revised) OF THE CAYMAN ISLANDS COMPANY LIMITED BY SHARES AMENDED AND RESTATED MEMORANDUM AND ARTICLES OF ASSOCIATION OF RICE ACQUISITION CORP. II (adopted by special resolution dated June 15, 2021 and effective on June 15, 2021) THE COMPANIES ACT (As Revised) OF THE CAYMAN ISLANDS COMPANY LIMITED BY SHARES AMENDED AND RESTATED MEMORANDUM OF ASSOCIATION OF RICE ACQ

June 21, 2021 EX-10.1

Letter Agreement, dated June 15, 2021, among RONI, its officers and directors and Sponsor (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed by the Registrant on June 21, 2021).

Exhibit 10.1 June 15, 2021 Rice Acquisition Corp. II 102 East Main Street, Second Story Carnegie, Pennsylvania 15106 Re: Initial Public Offering Ladies and Gentlemen: This letter (this ?Letter Agreement?) is being delivered to you in accordance with the Underwriting Agreement (the ?Underwriting Agreement?) entered into by and among Rice Acquisition Corp. II, a Cayman Islands exempted company (the

June 21, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Material Modification to Rights of Security Holders, Entry into a Material Definitive Agreement, Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Other Events, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 18, 2021 RICE ACQUISITION CORP. II (Exact name of registrant as specified in its charter) Cayman Islands 001-40503 98-1580612 (State or other jurisdiction (Commission File Number

June 21, 2021 EX-10.2

Investment Management Trust Agreement, dated as of June 15, 2021, between RONI, RONI Opco and Continental Stock Transfer & Trust Company (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed by the Registrant on June 21, 2021).

Exhibit 10.2 INVESTMENT MANAGEMENT TRUST AGREEMENT This Investment Management Trust Agreement (this ?Agreement?) is made effective as of June 15, 2021, by and among Rice Acquisition Corp. II, a Cayman Islands exempted company (the ?Company?), Rice Acquisition Holdings II LLC, a Cayman Islands limited liability company (?Opco? and together with the Company, the ?SPAC Parties?), and Continental Stoc

June 21, 2021 EX-10.6

Letter Agreement, dated June 15, 2021, among Rice Acquisition Corp. II, its officers and directors and Rice Acquisition Sponsor II LLC (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on June 21, 2021).

Exhibit 10.6 AMENDED AND RESTATED LIMITED LIABILITY COMPANY AGREEMENT OF RICE ACQUISITION HOLDINGS II LLC DATED June 15, 2021 THE LIMITED LIABILITY COMPANY INTERESTS IN RICE ACQUISITION HOLDINGS II LLC HAVE NOT BEEN REGISTERED UNDER THE U.S. SECURITIES ACT OF 1933, AS AMENDED, THE SECURITIES LAWS OF ANY STATE, OR ANY OTHER APPLICABLE SECURITIES LAWS, AND HAVE BEEN OR ARE BEING ISSUED IN RELIANCE U

June 21, 2021 EX-10.5

Private Placement Warrants Purchase Agreement, dated as of June 15, 2021, between RONI, RONI Opco and Sponsor (incorporated by reference to Exhibit 10.5 to the Current Report on Form 8-K filed by the Registrant on June 21, 2021).

Exhibit 10.5 PRIVATE PLACEMENT WARRANTS AND WARRANT RIGHTS PURCHASE AGREEMENT THIS PRIVATE PLACEMENT WARRANTS AND WARRANT RIGHTS PURCHASE AGREEMENT, dated as of June 15, 2021 (as it may from time to time be amended, this ?Agreement?), is entered into by and among Rice Acquisition Corp. II, a Cayman Islands exempted company (the ?Company?), Rice Acquisition Holdings II LLC, a Cayman Islands limited

June 21, 2021 EX-1.1

Underwriting Agreement, dated as of June 15, 2021, by and between the Company, Opco and Citigroup Global Markets Inc. and Barclays Capital Inc., as representatives of the several underwriters named therein.

Exhibit 1.1 30,000,000 Units RICE ACQUISITION CORP. II ($10.00 per Unit) UNDERWRITING AGREEMENT June 15, 2021 Citigroup Global Markets Inc. Barclays Capital Inc. As the Representative of the several Underwriters named in Schedule I attached hereto, c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 c/o Barclays Capital Inc. 745 Seventh Avenue New York, New York 10019 L

June 21, 2021 EX-4.1

Warrant Agreement between Continental Stock Transfer & Trust RONI and RONI Opco, dated June 15, 2021 (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed by the Registrant on June 21, 2021).

Exhibit 4.1 WARRANT AGREEMENT by and among RICE ACQUISITION CORP. II, RICE ACQUISITION HOLDINGS II LLC and CONTINENTAL STOCK TRANSFER & TRUST COMPANY Dated as of June 15, 2021 THIS WARRANT AGREEMENT (this ?Agreement?), dated as of June 15, 2021, is by and among Rice Acquisition Corp. II, a Cayman Islands exempted company (the ?Company?), Rice Acquisition Holdings II LLC, a Cayman Islands limited l

June 21, 2021 EX-10.3

Registration Rights Agreement, dated June 15, 2021, among Rice Acquisition Corp. II, Rice Acquisition Sponsor II LLC and certain other security holders named therein (incorporated by reference to Exhibit 10.3 to the Current Report on Form 8-K filed by the Registrant on June 21, 2021).

Exhibit 10.3 REGISTRATION RIGHTS AGREEMENT THIS REGISTRATION RIGHTS AGREEMENT (this ?Agreement?), dated as of June 15, 2021, is made and entered into by and among Rice Acquisition Corp. II, a Cayman Islands exempted company (the ?Company?), Rice Acquisition Sponsor II LLC, a Delaware limited liability company (the ?Sponsor?), and the undersigned parties listed under Holder on the signature page he

June 17, 2021 424B4

Rice Acquisition Corp. II $300,000,000 30,000,000 Units

424B4 1 f424b40621riceacqcorp2.htm PROSPECTUS Filed pursuant to Rule 424(b)(4) Registration Nos. 333-254080 and 333-257127 P R O S P E C T U S Rice Acquisition Corp. II $300,000,000 30,000,000 Units Rice Acquisition Corp. II is a blank check company incorporated as a Cayman Islands exempted company for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, recapitali

June 15, 2021 8-A12B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 Rice Acquisition Corp. II (Exact Name Of Regist

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 Rice Acquisition Corp.

June 15, 2021 S-1MEF

As filed with the U.S. Securities and Exchange Commission on June 15, 2021

S-1MEF 1 ea142791-s1mefriceacq2.htm REGISTRATION STATEMENT As filed with the U.S. Securities and Exchange Commission on June 15, 2021 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Rice Acquisition Corp. II (Exact name of registrant as specified in its charter) Cayman Islands 6770 98-1580612 (State o

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