NPWR Institutional Ownership & Shareholders
NET POWER INC (NPWR) is currently held by 120 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $94.48M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Greenlight Capital is currently the largest disclosed institutional shareholder of NPWR tracked by InsiderSet, reporting ownership valued at approximately $30.22M in its December 31, 2023 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $2.49M, representing an estimated loss of -91.74% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 78% of the total disclosed NPWR value among the investors covered in this analysis. Major shareholders include Greenlight Capital, Share Andrew L., Hite Hedge Asset Management Llc, and several other long-term asset managers with concentrated positions in NET POWER INC (NPWR).
This page ranks the largest institutional NPWR shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
120
Total Reported Value
$94.48M
Largest Holder
Greenlight Capital
Largest Position
$30.22M
Insider Transactions (90d)
23
Latest Filing Quarter
Q2 2026
New Institutional Positions
146
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Greenlight Capital | David Einhorn | 1.48% | 2,992,110 | $30,220,311 | $2,494,821 | -$27,725,490 | -91.74% |
| Share Andrew L. | 8.43% | 9,767,500 | $16,311,725 | $8,144,142 | -$8,167,584 | -50.07% | |
| Hite Hedge Asset Management Llc | 0.26% | 2,852,670 | $4,763,959 | $2,378,556 | -$2,385,403 | -50.07% | |
| Adage Capital Partners Gp, L.L.C. | 0.01% | 2,840,000 | $4,742,800 | $2,367,992 | -$2,374,808 | -50.07% | |
| Blackrock, Inc. | 0.00% | 2,416,294 | $4,035,211 | $2,014,706 | -$2,020,505 | -50.07% | |
| Peak6 Llc | 0.08% | 1,985,754 | $3,316,209 | $1,655,722 | -$1,660,487 | -50.07% | |
| Vanguard Capital Management Llc | 0.00% | 1,802,372 | $3,009,961 | $1,502,818 | -$1,507,143 | -50.07% | |
| Defiance Etfs, Llc | 0.04% | 1,555,837 | $2,598,248 | $1,297,257 | -$1,300,991 | -50.07% | |
| Tidal Investments Llc | 0.01% | 1,546,562 | $2,582,759 | $1,289,523 | -$1,293,236 | -50.07% | |
| Sourcerock Group Llc | 0.12% | 1,400,110 | $2,338,184 | $1,167,412 | -$1,170,772 | -50.07% | |
| Geode Capital Management, Llc | 0.00% | 1,006,014 | $1,680,463 | $838,814 | -$841,649 | -50.08% | |
| Cohen & Steers, Inc. | 0.00% | 888,954 | $1,485,000 | $741,210 | -$743,790 | -50.09% | |
| Gsa Capital Partners Llp | 0.09% | 851,296 | $1,422,000 | $709,811 | -$712,189 | -50.08% | |
| Argentarii, Llc | 0.34% | 746,799 | $1,112,731 | $622,681 | -$490,050 | -44.04% | |
| Two Sigma Investments, Lp | 0.00% | 660,570 | $1,103,152 | $550,783 | -$552,369 | -50.07% | |
| State Street Corp | 0.00% | 624,238 | $1,042,477 | $520,490 | -$521,987 | -50.07% | |
| Ubs Group Ag | 0.00% | 610,961 | $1,020,305 | $509,419 | -$510,886 | -50.07% | |
| D. E. Shaw & Co., Inc. | 0.00% | 412,502 | $688,878 | $343,944 | -$344,934 | -50.07% | |
| Tudor Investment Corp Et Al | 0.00% | 397,515 | $663,850 | $331,448 | -$332,402 | -50.07% | |
| Aqr Capital Management Llc | 0.00% | 385,283 | $643,422 | $321,249 | -$322,173 | -50.07% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 354,206 | $591,524 | $295,337 | -$296,187 | -50.07% |
| Northern Trust Corp | 0.00% | 334,814 | $559,139 | $279,168 | -$279,971 | -50.07% | |
| Vanguard Portfolio Management Llc | 0.00% | 324,611 | $542,100 | $270,661 | -$271,439 | -50.07% | |
| Nuveen, Llc | 0.00% | 288,876 | $482,423 | $240,865 | -$241,558 | -50.07% | |
| Charles Schwab Investment Management Inc | 0.00% | 288,276 | $481,421 | $240,365 | -$241,056 | -50.07% | |
| Vanguard Fiduciary Trust Co | 0.00% | 282,441 | $471,676 | $235,499 | -$236,177 | -50.07% | |
| Morgan Stanley | 0.00% | 270,736 | $452,128 | $225,740 | -$226,388 | -50.07% | |
| Boothbay Fund Management, Llc | 0.01% | 263,298 | $439,708 | $219,538 | -$220,170 | -50.07% | |
| Susquehanna International Group, Llp | 0.00% | 261,027 | $435,915 | $217,644 | -$218,271 | -50.07% | |
| Federated Hermes, Inc. | 0.00% | 248,208 | $414,507 | $206,956 | -$207,551 | -50.07% | |
| Shelton Capital Management | 0.01% | 200,300 | $334,501 | $167,010 | -$167,491 | -50.07% | |
| Mra Advisory Group | 0.12% | 214,893 | $320,191 | $179,178 | -$141,013 | -44.04% | |
| Dimensional Fund Advisors Lp | 0.00% | 163,443 | $272,950 | $136,279 | -$136,671 | -50.07% | |
| Goldman Sachs Group Inc | 0.00% | 151,365 | $252,780 | $126,208 | -$126,572 | -50.07% | |
| Susquehanna Fundamental Investments, Llc | 0.00% | 141,882 | $236,943 | $118,301 | -$118,642 | -50.07% | |
| Janney Montgomery Scott Llc | 0.00% | 133,000 | $222,000 | $110,895 | -$111,105 | -50.05% | |
| Caption Management, Llc | 0.01% | 122,452 | $204,495 | $102,100 | -$102,395 | -50.07% | |
| Alliancebernstein L.P. | 0.00% | 117,680 | $183,581 | $98,122 | -$85,459 | -46.55% | |
| Sir Capital Management, L.P. | 0.02% | 109,651 | $183,117 | $91,427 | -$91,690 | -50.07% | |
| Los Angeles Capital Management Llc | 0.00% | 96,430 | $161,038 | $80,403 | -$80,635 | -50.07% | |
| Moore Capital Management, Lp | 0.00% | 85,000 | $141,950 | $70,873 | -$71,077 | -50.07% | |
| Bank Of New York Mellon Corp | 0.00% | 83,821 | $139,982 | $69,890 | -$70,092 | -50.07% | |
| Simplex Trading, Llc | 0.00% | 77,604 | $129,598 | $64,706 | -$64,892 | -50.07% | |
| Xtx Topco Ltd | 0.00% | 73,944 | $123,486 | $61,655 | -$61,831 | -50.07% | |
| Hrt Financial Lp | 0.00% | 60,620 | $101,000 | $50,545 | -$50,455 | -49.96% | |
| Lpl Financial Llc | 0.00% | 57,074 | $95,314 | $47,588 | -$47,726 | -50.07% | |
| Deutsche Bank Ag\ | 0.00% | 56,064 | $93,627 | $46,746 | -$46,881 | -50.07% | |
| Qube Research & Technologies Ltd | 0.00% | 55,825 | $93,228 | $46,547 | -$46,681 | -50.07% | |
| Rhumbline Advisers | 0.00% | 53,919 | $90,036 | $44,958 | -$45,078 | -50.07% | |
| Imc-Chicago, Llc | 0.00% | 41,449 | $69,220 | $34,560 | -$34,660 | -50.07% |
Frequently asked questions about NPWR
Who are the largest institutional holders of NPWR?
The largest institutional holders of NPWR reported in the latest SEC Form 13F filings include Greenlight Capital, Share Andrew L., Hite Hedge Asset Management Llc, Adage Capital Partners Gp, L.L.C., and Blackrock, Inc.. InsiderSet ranks institutional holders by their latest reported NPWR position.
What is NPWR institutional ownership?
This page tracks NPWR positions reported by institutional investment managers through SEC Form 13F. NET POWER INC (NPWR) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own NPWR?
InsiderSet currently tracks 120 institutional managers reporting NPWR holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of NPWR shareholders.
How much NPWR stock do institutions own?
Institutional investment managers disclosed approximately $94.48M in NPWR holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was NPWR institutional ownership last updated?
The latest NPWR institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional NPWR holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its NPWR position after the reporting date.
Are institutions buying or selling NPWR?
Institutional buying and selling can be analyzed by comparing NPWR positions across consecutive 13F reporting periods. InsiderSet's NPWR Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View NPWR ownership changes.
How has NPWR institutional ownership changed over time?
InsiderSet tracks NPWR institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.