PATEL AKASH S.

SEC source: 0001845437-25-000016 · wk-form4_1743818266.xml · nonDerivative · entry 2

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · shares: The Reporting Person was issued 7,359 net shares of Class A Common Stock upon the vesting of 11,151 restricted stock units on April 2, 2025. The sale of such shares was effected pursuant to a Rule 10b5-1 trading plan.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $2.25 to $2.39, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

SEC source: 0001845437-25-000016 · wk-form4_1743818266.xml · derivative · entry 3

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 151,208

Underlying: Class A Common Stock · 117,757 shares

Expires not disclosed

F4 · derivative.exercise_price: The Reporting Person will receive a number of shares of Class A common stock equal to 50% of the number of PSUs upon attainment of a 10% compound annual growth rate ("CAGR") of the 30-day volume weighted average price ("VWAP") of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025. The Reporting Person will receive a number of shares of Class A common stock equal to 100% of the number of PSUs upon attainment of a 12% CAGR of the VWAP of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025. The Reporting Person will receive a number of shares of Class A common stock equal to 200% of the number of PSUs upon attainment of a 15% CAGR of the VWAP of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025.

F4 · derivative.exercise_date: The Reporting Person will receive a number of shares of Class A common stock equal to 50% of the number of PSUs upon attainment of a 10% compound annual growth rate ("CAGR") of the 30-day volume weighted average price ("VWAP") of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025. The Reporting Person will receive a number of shares of Class A common stock equal to 100% of the number of PSUs upon attainment of a 12% CAGR of the VWAP of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025. The Reporting Person will receive a number of shares of Class A common stock equal to 200% of the number of PSUs upon attainment of a 15% CAGR of the VWAP of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025.

F4 · derivative.expiration_date: The Reporting Person will receive a number of shares of Class A common stock equal to 50% of the number of PSUs upon attainment of a 10% compound annual growth rate ("CAGR") of the 30-day volume weighted average price ("VWAP") of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025. The Reporting Person will receive a number of shares of Class A common stock equal to 100% of the number of PSUs upon attainment of a 12% CAGR of the VWAP of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025. The Reporting Person will receive a number of shares of Class A common stock equal to 200% of the number of PSUs upon attainment of a 15% CAGR of the VWAP of a share of Class A common stock on April 2, 2028 as compared to the VWAP of a share of Class A common stock on April 2, 2025.

SEC source: 0001845437-25-000016 · wk-form4_1743818266.xml · nonDerivative · entry 1

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 457,790

F1 · shares: Restricted stock units that vest in three equal installments on each anniversary of April 2, 2025, subject to continued employment.

SEC source: 0001845437-24-000066 · wk-form4_1732654844.xml · derivative · entry 4

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 640,448

Underlying: Class A Common Stock · 150,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: On November 22, 2024, 150,000 Class A Units of NET Power Operations LLC (a subsidiary of the issuer) held by the reporting person were redeemed in exchange for an equal number of shares of the issuer's Class A Common Stock pursuant to a redemption notice from the reporting person dated November 22, 2024, and upon such redemption, 150,000 shares of the issuer's Class B Common Stock held by the reporting person were surrendered to the issuer and canceled.

F1 · derivative.exercise_date: On November 22, 2024, 150,000 Class A Units of NET Power Operations LLC (a subsidiary of the issuer) held by the reporting person were redeemed in exchange for an equal number of shares of the issuer's Class A Common Stock pursuant to a redemption notice from the reporting person dated November 22, 2024, and upon such redemption, 150,000 shares of the issuer's Class B Common Stock held by the reporting person were surrendered to the issuer and canceled.

F1 · derivative.expiration_date: On November 22, 2024, 150,000 Class A Units of NET Power Operations LLC (a subsidiary of the issuer) held by the reporting person were redeemed in exchange for an equal number of shares of the issuer's Class A Common Stock pursuant to a redemption notice from the reporting person dated November 22, 2024, and upon such redemption, 150,000 shares of the issuer's Class B Common Stock held by the reporting person were surrendered to the issuer and canceled.

SEC source: 0001845437-24-000066 · wk-form4_1732654844.xml · nonDerivative · entry 3

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

F2 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $12.35 to $13.41, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.

SEC source: 0001845437-24-000066 · wk-form4_1732654844.xml · nonDerivative · entry 2

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 150,000

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: On November 22, 2024, 150,000 Class A Units of NET Power Operations LLC (a subsidiary of the issuer) held by the reporting person were redeemed in exchange for an equal number of shares of the issuer's Class A Common Stock pursuant to a redemption notice from the reporting person dated November 22, 2024, and upon such redemption, 150,000 shares of the issuer's Class B Common Stock held by the reporting person were surrendered to the issuer and canceled.

SEC source: 0001845437-24-000066 · wk-form4_1732654844.xml · nonDerivative · entry 1

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 640,448

F1 · kind: On November 22, 2024, 150,000 Class A Units of NET Power Operations LLC (a subsidiary of the issuer) held by the reporting person were redeemed in exchange for an equal number of shares of the issuer's Class A Common Stock pursuant to a redemption notice from the reporting person dated November 22, 2024, and upon such redemption, 150,000 shares of the issuer's Class B Common Stock held by the reporting person were surrendered to the issuer and canceled.

SEC source: 0001845437-24-000012 · wk-form4_1712261508.xml · derivative · entry 3

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,451

Underlying: Class A Common Stock · 33,451 shares

Expires not disclosed

F3 · derivative.exercise_price: The Reporting Person will receive a number of shares of Class A common stock equal to 50% of the number of PSUs upon attainment of a 10% compound annual growth rate ("CAGR") of the 30-day volume weighted average price ("VWAP") of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024. The Reporting Person will receive a number of shares of Class A common stock equal to 100% of the number of PSUs upon attainment of a 12% CAGR of the VWAP of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024. The Reporting Person will receive a number of shares of Class A common stock equal to 200% of the number of PSUs upon attainment of a 15% CAGR of the VWAP of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024.

F3 · derivative.exercise_date: The Reporting Person will receive a number of shares of Class A common stock equal to 50% of the number of PSUs upon attainment of a 10% compound annual growth rate ("CAGR") of the 30-day volume weighted average price ("VWAP") of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024. The Reporting Person will receive a number of shares of Class A common stock equal to 100% of the number of PSUs upon attainment of a 12% CAGR of the VWAP of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024. The Reporting Person will receive a number of shares of Class A common stock equal to 200% of the number of PSUs upon attainment of a 15% CAGR of the VWAP of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024.

F3 · derivative.expiration_date: The Reporting Person will receive a number of shares of Class A common stock equal to 50% of the number of PSUs upon attainment of a 10% compound annual growth rate ("CAGR") of the 30-day volume weighted average price ("VWAP") of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024. The Reporting Person will receive a number of shares of Class A common stock equal to 100% of the number of PSUs upon attainment of a 12% CAGR of the VWAP of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024. The Reporting Person will receive a number of shares of Class A common stock equal to 200% of the number of PSUs upon attainment of a 15% CAGR of the VWAP of a share of Class A common stock on April 2, 2027 as compared to the VWAP of a share of Class A common stock on April 2, 2024.

SEC source: 0001845437-24-000012 · wk-form4_1712261508.xml · nonDerivative · entry 2

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 351,184

F2 · shares: Restricted stock units that vest upon the latest to occur of the following three events: (1) The date that is 12 months after the date on which natural gas is first ignited at NET Power's first utility-scale plant; (2) The date of execution by all parties to an agreement related to the first sale by NET Power and its subsidiaries of a license to construct, operate, and maintain a second power plant utilizing the "NET Power Cycle" (the "License Agreement"); and (3) The date of documentation of a final investment decision by the licensee under the above-referenced License Agreement to proceed with constructing the second power plant utilizing the "NET Power Cycle."

SEC source: 0001845437-24-000012 · wk-form4_1712261508.xml · nonDerivative · entry 1

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,451

F1 · shares: Restricted stock units that vest in three equal installments on each anniversary of April 2, 2024, subject to continued employment.

SEC source: 0001213900-23-048269 · ownership.xml · derivative · entry 2

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 790,448

Underlying: Class A common stock · 790,448 shares

Expires not disclosed

F2 · derivative.exercise_price: The Opco Units (together with the corresponding shares of the issuer's Class B common stock) are exchangeable into cash or shares of the issuer's Class A common stock, at the issuer's election, on a one-for-one basis and have no expiration date.

F1 · kind: On June 8, 2023, as a result of the consummation of the transactions (the "Business Combination") contemplated by that certain Business Combination Agreement, dated December 13, 2022 and subsequently amended on April 23, 2023, by and among the issuer, NET Power Operations LLC (f/k/a Rice Acquisition Holdings II LLC) ("Opco"), Topo Buyer Co, LLC, Topo Merger Sub, LLC and NET Power, LLC ("Old NET Power"), in exchange for the equity interests of Old NET Power, which were cancelled, Mr. Patel received Class A units of Opco (the "Opco Units") and a corresponding number of shares of the issuer's Class B common stock (which together are exchangeable into shares of the issuer's Class A Common Stock on a one-for-one basis).

F1 · price: On June 8, 2023, as a result of the consummation of the transactions (the "Business Combination") contemplated by that certain Business Combination Agreement, dated December 13, 2022 and subsequently amended on April 23, 2023, by and among the issuer, NET Power Operations LLC (f/k/a Rice Acquisition Holdings II LLC) ("Opco"), Topo Buyer Co, LLC, Topo Merger Sub, LLC and NET Power, LLC ("Old NET Power"), in exchange for the equity interests of Old NET Power, which were cancelled, Mr. Patel received Class A units of Opco (the "Opco Units") and a corresponding number of shares of the issuer's Class B common stock (which together are exchangeable into shares of the issuer's Class A Common Stock on a one-for-one basis).

F2 · derivative.exercise_date: The Opco Units (together with the corresponding shares of the issuer's Class B common stock) are exchangeable into cash or shares of the issuer's Class A common stock, at the issuer's election, on a one-for-one basis and have no expiration date.

F2 · derivative.expiration_date: The Opco Units (together with the corresponding shares of the issuer's Class B common stock) are exchangeable into cash or shares of the issuer's Class A common stock, at the issuer's election, on a one-for-one basis and have no expiration date.

SEC source: 0001213900-23-048269 · ownership.xml · nonDerivative · entry 1

PATEL AKASH S. · CIK 0001979780 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 790,448

F1 · kind: On June 8, 2023, as a result of the consummation of the transactions (the "Business Combination") contemplated by that certain Business Combination Agreement, dated December 13, 2022 and subsequently amended on April 23, 2023, by and among the issuer, NET Power Operations LLC (f/k/a Rice Acquisition Holdings II LLC) ("Opco"), Topo Buyer Co, LLC, Topo Merger Sub, LLC and NET Power, LLC ("Old NET Power"), in exchange for the equity interests of Old NET Power, which were cancelled, Mr. Patel received Class A units of Opco (the "Opco Units") and a corresponding number of shares of the issuer's Class B common stock (which together are exchangeable into shares of the issuer's Class A Common Stock on a one-for-one basis).

F1 · price: On June 8, 2023, as a result of the consummation of the transactions (the "Business Combination") contemplated by that certain Business Combination Agreement, dated December 13, 2022 and subsequently amended on April 23, 2023, by and among the issuer, NET Power Operations LLC (f/k/a Rice Acquisition Holdings II LLC) ("Opco"), Topo Buyer Co, LLC, Topo Merger Sub, LLC and NET Power, LLC ("Old NET Power"), in exchange for the equity interests of Old NET Power, which were cancelled, Mr. Patel received Class A units of Opco (the "Opco Units") and a corresponding number of shares of the issuer's Class B common stock (which together are exchangeable into shares of the issuer's Class A Common Stock on a one-for-one basis).