Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Net Power Inc.

CIK 0001845437NPWRNPWR-WT· quarter ending 2026-06-30

Shares outstanding

224,858,561

as of 2026-08-11 · 10-Q cover page, filed 2026-08-13

Held by 13F filers

10,515,313

selection includes debt or preferreds — no % of shares outstanding

Holders

-3 vs 2026-03-31 · 0 new, 3 exited

Value

$3.2M

shares -13.9% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-13, as of 2026-08-11)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common Class A	NPWR · NYSE	88,480,681	38,420,554	43.4%	120	64107A105
Common Class B	not listed	136,377,880	—	—

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	64107A105	COM CL A	120	38,420,554	88,480,681	43.4%	$64.1M	4 call / 3 put	13DG	holders →
	64107A113	*W EXP 06/08/202not common	22	10,515,313	—	—	$3.2M	1 call / 0 put	prefix	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (22 of 22 · 64107A113)

change vs 2026-03-31

#	Filer	Shares / principal	% of class	Value	Change
1	Share Andrew L.	5,342,547	—	$1.5M	—
2	LMR Partners LLP	1,705,116	—	$494K	+13,400 (+0.8%)
3	ZAZOVE ASSOCIATES LLC	1,533,692	—	$475K	-1,543,532 (-50.2%)
4	KENSICO CAPITAL MANAGEMENT CORP	453,800	—	$132K	-1,400 (-0.3%)
5	TORONTO DOMINION BANK	278,099	—	$81K	-100 (-0.0%)
6	COHEN & STEERS, INC.	182,834	—	$53K	-10,772 (-5.6%)
7	Saba Capital Management, L.P.	180,984	—	$56K	—
8	WOLVERINE ASSET MANAGEMENT LLC	168,890	—	$49K	+43,973 (+35.2%)
9	Caption Management, LLC	114,375	—	$33K	—
10	ARISTEIA CAPITAL, L.L.C.	111,888	—	$35K	—
11	Arosa Capital Management LP	106,249	—	$31K	—
12	MOORE CAPITAL MANAGEMENT, LP	100,000	—	$29K	—
13	BOOTHBAY FUND MANAGEMENT, LLC	77,370	—	$129K	—
14	K2 PRINCIPAL FUND, L.P.	46,181	—	$13K	—
15	Thomas J. Herzfeld Advisors, Inc.	32,771	—	$10K	—
16	Ionic Capital Management LLC	29,036	—	$8K	-140,167 (-82.8%)
17	Teilinger Capital Ltd.	25,000	—	$7K	—
18	D. E. Shaw & Co., Inc.	15,032	—	$4K	—
19	Dynamic Advisor Solutions LLC	10,400	—	$3K	—
20	UBS Group AG	474	—	$137	-8,835 (-94.9%)
21	NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO	375	—	$109	—
22	Clear Street Group Inc.	200	—	$58	—

Exited since 2026-03-31 (3 filers; largest 3 shown)

BLUEFIN CAPITAL MANAGEMENT, LLC	−26,537
Hunting Hill Global Capital, LLC	−16,583
SUSQUEHANNA INTERNATIONAL GROUP, LLP	−11,795

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
8RCH, LLC	SCHEDULE 13D/A	2026-08-17	2026-08-13	0	0%
8 RIVERS CAPITAL, LLC	SCHEDULE 13D/A	2026-08-17	2026-08-13	18,972,780	17.86%
DAMIAN BEAUCHAMP	SCHEDULE 13D/A	2026-08-17	2026-08-13	18,972,780	17.86%
NPEH, LLC	SCHEDULE 13D/A	2026-08-17	2026-08-13	18,972,780	17.86%
Cynda Beauchamp	SCHEDULE 13D/A	2025-11-04	2025-11-02	0	0%
ARECA, INC.	SCHEDULE 13D/A	2025-10-29	2025-10-27	0	0%
CHAMAEDOREA, INC.	SCHEDULE 13D/A	2025-10-29	2025-10-27	0	0%
TILLANDSIA, INC.	SCHEDULE 13D/A	2025-10-29	2025-10-27	0	0%
SK INC.	SCHEDULE 13D/A	2025-08-01	2025-07-30	0	0%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.