NET Power Inc. — Director's Dealing 2025

Jun 5, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: NET Power Inc. (NPWR)
CIK: 0001845437
Period of Report: 2025-06-02

Reporting Person: Horstman Marc (Chief Operating Officer)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-06-02	Stock Options	$2.13	A	240000	Acquired	2030-06-02	Class A Common Stock (240000)	Direct
2025-06-02	Performance Stock Units	$	A	74766	Acquired		Class A Common Stock (74766)	Direct

Footnotes

F1: Stock options vest on June 2, 2026, subject to continued employment.

F2: 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.