X0508 4 2025-10-31 1 0001845437 NET Power Inc. NPWR 0002079418 Beauchamp Cynda 8 THE GREEN STE B DOVER DE 19901 0 0 1 0 0 Class A Common Stock 2025-10-31 4 S 0 18116 4.0527 D 1847130 I See Footnote Class A Common Stock 2025-11-02 4 J 0 1847130 D 0 I See Footnotes Class B Common Stock 2025-11-02 4 J 0 22729880 D 0 I See Footnotes Class A Units of NET Power Operations LLC 2025-11-02 4 J 0 22729880 D Class A Common Stock 22729880 0 I See Footnotes The price reported reflects the weighted average sales price. The shares of Class A Common Stock were sold in multiple trades at prices ranging from $4.05 to $4.06. NPEH, LLC ("NPEH") will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price. The securities reported in this Form 4 are directly held by NPEH, a limited liability company of which the Reporting Person was the indirect majority owner. On November 2, 2025, the Reporting Person sold 100% of the equity interests of 8RCH, LLC, which holds 50% of the equity interests of each of Tillandsia, Inc. ("Tillandsia"), Areca, Inc. ("Areca") and Chamaedorea, Inc. ("Chamaedoria"). Tillandsia, Areca and Chamaedorea own approximately 18.6%, 25.77% and 24.11%, respectively, of the voting units of 8 Rivers Capital, LLC ("8 Rivers"). 8 Rivers is the manager and owns approximately 91.4% of NPEH. For each Class A Unit of Net Power Operations LLC, NPEH owns one corresponding share of Class B Common Stock of the Issuer. The Class A Units of NET Power Operations LLC are exchangeable (together with the cancellation of a corresponding number of shares of the Issuer's Class B Common Stock) into shares of the Issuer's Class A Common Stock on a one-for-one basis or, at the Issuer's election, cash, and have no expiration date. /s/ Cynda Beauchamp 2025-11-04