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 Mar 31, 2025
Ownership Breakdown
117
Institutional Holders
▼ 5 vs Q4
$81.42M
Total Inst. Value
▼ $254.34M vs Q4
88.38M
Shares Outstanding
freeFloat 47.83%
30.94M
13F Shares Held
▼ 771,272 vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
SHARE ANDREW L. blank checks | 9.94M | 13.54% | 13.54% | $26.14B | Apr 17, 2025 | — held |
VANGUARD GROUP INC blank checks | 2.86M | 3.90% | 3.90% | $7.53B | May 9, 2025 | ▼ 3.4K |
ADAGE CAPITAL PARTNERS GP, L.L.C. blank checks | 2.44M | 3.32% | 3.32% | $6.42B | May 15, 2025 | ▲ 2.04M |
CENTERBOOK PARTNERS LP blank checks | 1.74M | 2.38% | 2.38% | $4.59B | May 9, 2025 | ▲ 1.65M |
KENSICO CAPITAL MANAGEMENT CORP blank checks | 1.69M | 2.30% | 2.30% | $4.44B | May 15, 2025 | ▼ 55.4K |
BLACKROCK, INC. blank checks | 1.53M | 2.09% | 2.09% | $4.03B | May 2, 2025 | ▼ 41.3K |
KHROM CAPITAL MANAGEMENT LLC blank checks | 1.08M | 1.48% | 1.48% | $2.85B | May 15, 2025 | — held |
COHEN & STEERS, INC. blank checks | 958.0K | 1.31% | 1.31% | $2.52B | May 15, 2025 | ▲ 22.0K |
HITE HEDGE ASSET MANAGEMENT LLC blank checks | 743.2K | 1.01% | 1.01% | $1.95B | May 14, 2025 | ▲ 331.7K |
MARSHALL WACE, LLP blank checks | 738.0K | 1.01% | 1.01% | $1.94B | May 15, 2025 | ▲ 289.4K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
23
Increased
+5.69M shares8
New Positions
first time holders16
Decreased
−1.51M shares0
Sold Out
fully exitedNet shares change (top 50)
+4.18M
+5.69M / −1.51M
Net new holders
+15
8 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 35.0% of total shares outstanding. Company insiders own approximately 52.17%, while retail and public investors account for the remaining 12.83%.
The largest institutional shareholder of NET Power Inc. is SHARE ANDREW L., holding approximately 9.94 million shares — equal to 13.54% of outstanding shares — as of March 31, 2025.
A total of 117 institutional investors currently hold NPWR stock, with a combined institutional value of approximately $81,416,849 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 35.0% of shares. The largest shareholder is SHARE ANDREW L. with a 13.54% stake. Company insiders hold 52.17%. Data sourced from SEC Form 13F as of March 31, 2025.