NET POWER INC (NPWR) Institutional Shareholders
NET POWER INC (NPWR) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $94.28M in NPWR holdings during the latest filing period.
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 $5.48M, representing an estimated loss of -81.88% 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
$94.28M
Largest Holder
Greenlight Capital
Largest Position
$30.22M
Insider Transactions (90d)
35
Latest Filing Quarter
Q2 2026
New Institutional Positions
148
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 | $5,475,561 | -$24,744,750 | -81.88% |
| Share Andrew L. | 8.43% | 9,767,500 | $16,311,725 | $17,874,525 | +$1,562,800 | +9.58% | |
| Hite Hedge Asset Management Llc | 0.26% | 2,852,670 | $4,763,959 | $5,220,386 | +$456,427 | +9.58% | |
| Adage Capital Partners Gp, L.L.C. | 0.01% | 2,840,000 | $4,742,800 | $5,197,200 | +$454,400 | +9.58% | |
| Blackrock, Inc. | 0.00% | 2,416,294 | $4,035,211 | $4,421,818 | +$386,607 | +9.58% | |
| Peak6 Llc | 0.08% | 1,985,754 | $3,316,209 | $3,633,930 | +$317,721 | +9.58% | |
| Vanguard Capital Management Llc | 0.00% | 1,802,372 | $3,009,961 | $3,298,341 | +$288,380 | +9.58% | |
| Defiance Etfs, Llc | 0.04% | 1,555,837 | $2,598,248 | $2,847,182 | +$248,934 | +9.58% | |
| Tidal Investments Llc | 0.01% | 1,546,562 | $2,582,759 | $2,830,208 | +$247,449 | +9.58% | |
| Sourcerock Group Llc | 0.12% | 1,400,110 | $2,338,184 | $2,562,201 | +$224,017 | +9.58% | |
| Geode Capital Management, Llc | 0.00% | 1,006,014 | $1,680,463 | $1,841,006 | +$160,543 | +9.55% | |
| Cohen & Steers, Inc. | 0.00% | 888,954 | $1,485,000 | $1,626,786 | +$141,786 | +9.55% | |
| Gsa Capital Partners Llp | 0.09% | 851,296 | $1,422,000 | $1,557,872 | +$135,872 | +9.55% | |
| Argentarii, Llc | 0.36% | 746,799 | $1,209,814 | $1,366,642 | +$156,828 | +12.96% | |
| Two Sigma Investments, Lp | 0.00% | 660,570 | $1,103,152 | $1,208,843 | +$105,691 | +9.58% | |
| State Street Corp | 0.00% | 624,238 | $1,042,477 | $1,142,356 | +$99,879 | +9.58% | |
| Ubs Group Ag | 0.00% | 610,961 | $1,020,305 | $1,118,059 | +$97,754 | +9.58% | |
| D. E. Shaw & Co., Inc. | 0.00% | 412,502 | $688,878 | $754,879 | +$66,001 | +9.58% | |
| Tudor Investment Corp Et Al | 0.00% | 397,515 | $663,850 | $727,452 | +$63,602 | +9.58% | |
| Aqr Capital Management Llc | 0.00% | 385,283 | $643,422 | $705,068 | +$61,646 | +9.58% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 354,206 | $591,524 | $648,197 | +$56,673 | +9.58% |
| Northern Trust Corp | 0.00% | 334,814 | $559,139 | $612,710 | +$53,571 | +9.58% | |
| Vanguard Portfolio Management Llc | 0.00% | 324,611 | $542,100 | $594,038 | +$51,938 | +9.58% | |
| Nuveen, Llc | 0.00% | 288,876 | $482,423 | $528,643 | +$46,220 | +9.58% | |
| Charles Schwab Investment Management Inc | 0.00% | 288,276 | $481,421 | $527,545 | +$46,124 | +9.58% | |
| Vanguard Fiduciary Trust Co | 0.00% | 282,441 | $471,676 | $516,867 | +$45,191 | +9.58% | |
| Morgan Stanley | 0.00% | 270,736 | $452,128 | $495,447 | +$43,319 | +9.58% | |
| Boothbay Fund Management, Llc | 0.01% | 263,298 | $439,708 | $481,835 | +$42,127 | +9.58% | |
| Susquehanna International Group, Llp | 0.00% | 261,027 | $435,915 | $477,679 | +$41,764 | +9.58% | |
| Federated Hermes, Inc. | 0.00% | 248,208 | $414,507 | $454,221 | +$39,714 | +9.58% | |
| Shelton Capital Management | 0.01% | 200,300 | $334,501 | $366,549 | +$32,048 | +9.58% | |
| Dimensional Fund Advisors Lp | 0.00% | 163,443 | $272,950 | $299,101 | +$26,151 | +9.58% | |
| Goldman Sachs Group Inc | 0.00% | 151,365 | $252,780 | $276,998 | +$24,218 | +9.58% | |
| Susquehanna Fundamental Investments, Llc | 0.00% | 141,882 | $236,943 | $259,644 | +$22,701 | +9.58% | |
| Janney Montgomery Scott Llc | 0.00% | 133,000 | $222,000 | $243,390 | +$21,390 | +9.64% | |
| Caption Management, Llc | 0.01% | 122,452 | $204,495 | $224,087 | +$19,592 | +9.58% | |
| Alliancebernstein L.P. | 0.00% | 117,680 | $183,581 | $215,354 | +$31,773 | +17.31% | |
| Sir Capital Management, L.P. | 0.02% | 109,651 | $183,117 | $200,661 | +$17,544 | +9.58% | |
| Los Angeles Capital Management Llc | 0.00% | 96,430 | $161,038 | $176,467 | +$15,429 | +9.58% | |
| Moore Capital Management, Lp | 0.00% | 85,000 | $141,950 | $155,550 | +$13,600 | +9.58% | |
| Bank Of New York Mellon Corp | 0.00% | 83,821 | $139,982 | $153,392 | +$13,410 | +9.58% | |
| Simplex Trading, Llc | 0.00% | 77,604 | $129,598 | $142,015 | +$12,417 | +9.58% | |
| Xtx Topco Ltd | 0.00% | 73,944 | $123,486 | $135,318 | +$11,832 | +9.58% | |
| Hrt Financial Lp | 0.00% | 60,620 | $101,000 | $110,935 | +$9,935 | +9.84% | |
| Lpl Financial Llc | 0.00% | 57,074 | $95,314 | $104,445 | +$9,131 | +9.58% | |
| Deutsche Bank Ag\ | 0.00% | 56,064 | $93,627 | $102,597 | +$8,970 | +9.58% | |
| Qube Research & Technologies Ltd | 0.00% | 55,825 | $93,228 | $102,160 | +$8,932 | +9.58% | |
| Rhumbline Advisers | 0.00% | 53,919 | $90,036 | $98,672 | +$8,636 | +9.59% | |
| Imc-Chicago, Llc | 0.00% | 41,449 | $69,220 | $75,852 | +$6,632 | +9.58% | |
| Osaic Holdings, Inc. | 0.00% | 40,785 | $68,106 | $74,637 | +$6,531 | +9.59% |
Frequently asked questions about NPWR
Who owns the most NPWR stock?
The largest holders of NPWR are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for NET POWER INC (NPWR).
Is NPWR widely held by superinvestors?
Many widely followed stocks like NPWR appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly NPWR is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.