NET Power Inc.
NET Power Inc. (NPWR) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · NPWR · as of Sep 30, 2025
Ownership Breakdown
109
Institutional Holders
▲ 7 vs Q2
$97.82M
Total Inst. Value
▲ $23.25M vs Q2
88.38M
Shares Outstanding
freeFloat 47.83%
32.50M
13F Shares Held
▲ 2.31M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
NPWR largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
SHARE ANDREW L. blank checks | 9.94M | 12.79% | 12.79% | $29.91B | Nov 5, 2025 | — held |
ADAGE CAPITAL PARTNERS GP, L.L.C. blank checks | 2.51M | 3.23% | 3.23% | $7.55B | Nov 14, 2025 | ▼ 330.1K |
MILLENNIUM MANAGEMENT LLC blank checks | 2.37M | 3.04% | 3.04% | $7.12B | Nov 14, 2025 | ▲ 1.21M |
BLACKROCK, INC. blank checks | 2.05M | 2.64% | 2.64% | $6.16B | Nov 12, 2025 | ▲ 45.7K |
VANGUARD GROUP INC blank checks | 1.79M | 2.30% | 2.30% | $5.37B | Nov 7, 2025 | ▼ 580.6K |
PEAK6 LLC blank checks | 1.46M | 1.88% | 1.88% | $4.40B | Mar 31, 2026 | ▼ 23.3K |
CENTERBOOK PARTNERS LP blank checks | 1.25M | 1.61% | 1.61% | $3.76B | Nov 7, 2025 | ▲ 550.3K |
HITE HEDGE ASSET MANAGEMENT LLC blank checks | 976.4K | 1.26% | 1.26% | $2.94B | Nov 13, 2025 | ▼ 701.7K |
COHEN & STEERS, INC. blank checks | 950.7K | 1.22% | 1.22% | $2.86B | Nov 14, 2025 | ▼ 4.9K |
MORGAN STANLEY blank checks | 936.4K | 1.21% | 1.21% | $2.82B | May 27, 2026 | ▲ 613.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
24
Increased
+4.31M shares6
New Positions
first time holders15
Decreased
−2.19M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.12M
+4.31M / −2.19M
Net new holders
+15
6 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
NPWR insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
0
Buy transactions
4
Sell transactions
0.00
Buy/Sell ratio
$1M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
NPEH, LLC 10 percent owner | May 12, 2026 | Sale | 400,000 | $2.44 | $975.6K | 3.00M | Form 4 ↗ |
NPEH, LLC 10 percent owner | May 13, 2026 | Sale | 35,000 | $2.43 | $85.2K | 2.96M | Form 4 ↗ |
8 Rivers Capital, LLC 10 percent owner | May 12, 2026 | Sale | 400,000 | $2.44 | $975.6K | 3.00M | Form 4 ↗ |
8 Rivers Capital, LLC 10 percent owner | May 13, 2026 | Sale | 35,000 | $2.43 | $85.2K | 2.96M | Form 4 ↗ |
NPEH, LLC 10 percent owner | Mar 6, 2026 | C-Conversion | 3,000,000 | — | — | 17.73M | Form 4 ↗ |
8 Rivers Capital, LLC 10 percent owner | Mar 6, 2026 | C-Conversion | 3,000,000 | — | — | 17.73M | Form 4 ↗ |
8 Rivers Capital, LLC 10 percent owner | Mar 6, 2026 | J-Other | 3,000,000 | — | — | 17.73M | Form 4 ↗ |
8 Rivers Capital, LLC 10 percent owner | Mar 6, 2026 | C-Conversion | 3,000,000 | — | — | 3.40M | Form 4 ↗ |
NPEH, LLC 10 percent owner | Mar 6, 2026 | J-Other | 3,000,000 | — | — | 17.73M | Form 4 ↗ |
NPEH, LLC 10 percent owner | Mar 6, 2026 | C-Conversion | 3,000,000 | — | — | 3.40M | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
NET Power Inc. (NPWR) is primarily owned by institutional investors, who hold approximately 36.8% of total shares outstanding. Company insiders own approximately 52.17%, while retail and public investors account for the remaining 11.06%.
The largest institutional shareholder of NET Power Inc. is SHARE ANDREW L., holding approximately 9.94 million shares — equal to 12.79% of outstanding shares — as of September 30, 2025.
A total of 109 institutional investors currently hold NPWR stock, with a combined institutional value of approximately $97,819,839 as of the most recent 13F filing period.
Frequently asked questions
NPWR ownershipNET Power Inc. (NPWR) is primarily owned by institutional investors, who hold approximately 36.8% of shares. The largest shareholder is SHARE ANDREW L. with a 12.79% stake. Company insiders hold 52.17%. Data sourced from SEC Form 13F as of September 30, 2025.