NET Power Inc. - Class A Common Stock, par value $0.0001 (NPWR) Institutional Ownership

13F Institutional Holders and Ownership History from Q2 2023 to Q4 2025

Type / Class
Equity / Class A Common Stock, par value $0.0001
Symbol
NPWR on NYSE
Underlying class
Class A Common Stock
Shares outstanding
104,628,674
Price per share
$2.28
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
32,472,478
Total reported value
$97,731,144
% of total 13F portfolios
0%
Share change
+2,282,317
Value change
+$7,235,551
Number of holders
100
Price from insider filings
$2.28
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of NET Power Inc. - Class A Common Stock, par value $0.0001 (NPWR) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
SK INC. 26% 0% $51,588,668 26,729,880 0% 8 RIVERS CAPITAL, LLC 30 Jul 2025
8 Rivers Capital, LLC 22% -5.4% $66,347,658 -$3,672,661 23,279,880 -5.2% 8 RIVERS CAPITAL, LLC 05 Dec 2025

As of 30 Sep 2025, 100 institutional investors reported holding 32,472,478 shares of NET Power Inc. - Class A Common Stock, par value $0.0001 (NPWR). This represents 31% of the company’s total 104,628,674 outstanding shares.

Top 25 Institutional Shareholders

The largest institutional shareholders of NET Power Inc. - Class A Common Stock, par value $0.0001 (NPWR) together control 28% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.

Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
Share Andrew L. 9.5% 9,937,500 0% 21% $29,911,875
ADAGE CAPITAL PARTNERS GP, L.L.C. 2.4% 2,509,868 -12% 0.01% $7,554,703
MILLENNIUM MANAGEMENT LLC 2.3% 2,365,246 +104% 0.01% $7,119,390
BlackRock, Inc. 2% 2,047,780 +2.3% 0% $6,163,817
VANGUARD GROUP INC 1.7% 1,785,594 -25% 0% $5,374,639
CenterBook Partners LP 1.2% 1,248,348 +79% 0.19% $3,757,527
HITE Hedge Asset Management LLC 0.93% 976,428 -42% 0.16% $2,939,048
COHEN & STEERS, INC. 0.91% 950,711 -0.51% 0.01% $2,862,000
MORGAN STANLEY 0.89% 936,368 +190% 0% $2,818,467
GEODE CAPITAL MANAGEMENT, LLC 0.84% 874,519 +4% 0% $2,632,730
TWO SIGMA INVESTMENTS, LP 0.79% 821,793 +37% 0% $2,473,597
Nuveen, LLC 0.67% 702,391 0% 0% $2,114,197
STATE STREET CORP 0.57% 594,693 +3.9% 0% $1,790,026
WELLINGTON MANAGEMENT GROUP LLP 0.49% 516,508 +4.5% 0% $1,554,689
UBS Group AG 0.41% 430,452 +183% 0% $1,295,661
SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.4% 423,357 -20% 0% $1,274,305
Caption Management, LLC 0.33% 345,472 -14% 0.06% $1,039,871
DIMENSIONAL FUND ADVISORS LP 0.32% 336,832 -12% 0% $1,014,409
Walleye Capital LLC 0.27% 284,932 0.01% $857,645
GOLDMAN SACHS GROUP INC 0.27% 278,425 +1017% 0% $838,059
JANE STREET GROUP, LLC 0.26% 268,795 0% $809,073
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.26% 268,291 -2.1% 0% $807,556
NORTHERN TRUST CORP 0.24% 255,917 -7.7% 0% $770,311
TWO SIGMA ADVISERS, LP 0.23% 241,900 +54% 0% $728,119
Empowered Funds, LLC 0.21% 223,204 0.01% $671,844

Institutional Holders of NET Power Inc. - Class A Common Stock, par value $0.0001 (NPWR) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2025 Q4 281,941 $642,826 +$420,406 $2.28 4
2025 Q3 32,472,478 $97,731,144 +$7,235,551 $3.01 100
2025 Q2 30,187,661 $74,563,817 -$2,557,393 $2.47 94
2025 Q1 30,912,137 $81,297,889 -$45,619,097 $2.63 105
2024 Q4 31,694,051 $335,609,802 +$23,180,587 $10.59 110
2024 Q3 30,684,984 $215,102,693 +$2,065,398 $7.01 89
2024 Q2 29,745,406 $292,378,368 +$23,316,157 $9.83 92
2024 Q1 26,549,973 $302,402,674 -$60,786,165 $11.39 74
2023 Q4 35,614 $359,701 +$359,701 $10.10 2
2023 Q3 32,213,098 $486,417,055 +$210,002,815 $15.10 57
2023 Q2 18,323,204 $238,201,720 +$237,966,618 $13.00 41