NET Power Inc. (NPWR) Institutional Ownership

Ownership Summary

A total of 107 institutions have reported a stake in NET Power Inc. (NYSE:NPWR) as of December 2025, according to recent 13F filings with the SEC.

• The percentage of NET Power owned by institutions changed from 14.5% in September 2025 to 14.9% in December 2025, marking a slight up trend.
• On a quarter-over-quarter basis, institutional holdings shifted by 6.07%, with a year-over-year a decrease of 4.46% in the count of filers.
• A review of institutional activity for NET Power shows 50 of 107 filers increasing their positions, while 36 reduced their stake, and 21 remained unchanged.
• The total number of shares held by institutions in NET Power increased to 33.38Mn as of December 2025, a net change of up by 1.91Mn shares quarter on quarter, and up 1.90Mn shares year over year.
• As of December 31, 2025, Share Andrew L. held NET Power's largest shareholding position with over 9.77Mn shares, representing 4.36% of total outstanding shares.
• Among the most significant buyers of NET Power during December 2025 were Sourcerock Group LLC (1.50Mn), PEAK6 LLC (1.35Mn), CenterBook Partners LP (599.73K), JANE STREET GROUP, LLC (466.17K), BOOTHBAY FUND MANAGEMENT, LLC (300.55K).
• Leading sellers of NET Power stock in December 2025 included ADAGE CAPITAL PARTNERS GP, L.L.C. (969.87K), MORGAN STANLEY (632.67K), UBS Group AG (365.96K), Caption Management, LLC (259.24K), WELLINGTON MANAGEMENT GROUP LLP (242.18K).
• The top 10 institutional holders of NET Power for the quarter ending December 2025 included Share Andrew L. (9.77Mn), MILLENNIUM MANAGEMENT LLC (2.28Mn), VANGUARD GROUP INC (2.02Mn), BlackRock, Inc. (2.00Mn), CenterBook Partners LP (1.85Mn), ADAGE CAPITAL PARTNERS GP, L.L.C. (1.54Mn), Sourcerock Group LLC (1.50Mn), PEAK6 LLC (1.35Mn), COHEN & STEERS, INC. (944.59K), GEODE CAPITAL MANAGEMENT, LLC (831.55K).