129 institutions reported holding $56.2M of NET POWER INC (NPWR) in SEC 13F filings for 2026-03-31. Largest institutional holders: Share Andrew L. ($15.2M), HITE Hedge Asset Management LLC ($4.3M), PEAK6 LLC ($3.6M), BlackRock, Inc. ($3.3M), VANGUARD CAPITAL MANAGEMENT LLC ($2.6M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | Share Andrew L. | $15.2M | 9.8M | Hold |
| 2 | HITE Hedge Asset Management LLC | $4.3M | 2.8M | Added |
| 3 | PEAK6 LLC | $3.6M | 2.3M | Trimmed |
| 4 | BlackRock, Inc. | $3.3M | 2.1M | Added |
| 5 | VANGUARD CAPITAL MANAGEMENT LLC | $2.6M | 1.6M | New |
| 6 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $2.4M | 1.5M | Hold |
| 7 | Sourcerock Group LLC | $2.3M | 1.5M | Added |
| 8 | TWO SIGMA INVESTMENTS, LP | $1.7M | 1.1M | Added |
| 9 | COHEN & STEERS, INC. | $1.4M | 892,140 | Trimmed |
| 10 | GEODE CAPITAL MANAGEMENT, LLC | $1.3M | 860,386 | Added |
| 11 | Argentarii, LLC | $1.2M | 748,649 | Added |
| 12 | Nuveen, LLC | $1.1M | 713,760 | Added |
| 13 | RENAISSANCE TECHNOLOGIES LLC | $1.1M | 703,800 | Added |
| 14 | MILLENNIUM MANAGEMENT LLC | $1.1M | 682,705 | Trimmed |
| 15 | STATE STREET CORP | $957,113 | 613,534 | Added |
| 16 | Tidal Investments LLC | $831,875 | 533,253 | Added |
| 17 | Defiance ETFs, LLC | $831,875 | 533,253 | New |
| 18 | CenterBook Partners LP | $682,923 | 437,771 | Trimmed |
| 19 | TUDOR INVESTMENT CORP ET AL | $672,599 | 431,153 | Added |
| 20 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $671,305 | 430,324 | Trimmed |
| 21 | CITADEL ADVISORS LLC | $582,786 | 373,581 | Added |
| 22 | UBS Group AG | $577,002 | 369,873 | Added |
| 23 | BOOTHBAY FUND MANAGEMENT, LLC | $461,684 | 295,951 | Trimmed |
| 24 | NORTHERN TRUST CORP | $455,558 | 292,024 | Added |
| 25 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $420,448 | 269,518 | Added |
Source: SEC Form 13F filings · as of 2026-03-31