Net Power Inc.
NPWR- Exchange
- NYSE
- Industry
- Electrical Industrial Apparatus
- SEC CIK
- 0001845437
In the last 90 days, Net Power Inc. insiders filed 0 open-market purchases and 7 sales; 120 institutions reported holding it in 13F filings for Q2 2026, worth $64.1M in total; no superinvestor holds it.
Other share classesNPWR.WT
Holders of 5% or more of NPWR
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Net Power Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| SK Inc. | 13D/A | 25.60%26.7M shares | 0.00 ppfrom 25.60% | Jul 17, 20252 filings | Aug 1, 2025 | SEC |
| 8 Rivers Capital, LLC | 13D/A | 17.86%19.0M shares | −1.64 ppfrom 19.50% | Oct 29, 20256 filings | Aug 17, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
11 Schedule 13D and 13G filings on Net Power Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 17, 20266:00 PM ET | 8 Rivers Capital, LLCand 3 others | 13D/A | 17.86%19.0M shares | −1.64 ppfrom 19.50% | Aug 13, 2026 | SEC |
| May 14, 20266:00 PM ET | 8 Rivers Capital, LLCand 3 others | 13D/A | 19.50%20.7M shares | −1.51 ppfrom 21.01% | May 12, 2026 | SEC |
| Jan 28, 20266:14 PM ET | 8 Rivers Capital, LLCand 3 others | 13D/A | 21.01%22.0M shares | −1.24 ppfrom 22.25% | Jan 26, 2026 | SEC |
| Dec 9, 20255:49 PM ET | 8 Rivers Capital, LLCand 3 others | 13D/A | 22.25%23.3M shares | −1.24 ppfrom 23.49% | Dec 5, 2025 | SEC |
| Nov 4, 20259:47 PM ET | 8 Rivers Capital, LLCand 4 others | 13D/A | 23.49%24.6M shares | −0.12 ppfrom 23.61% | Nov 2, 2025 | SEC |
| Oct 29, 20258:40 PM ET | 8 Rivers Capital, LLCand 7 others | 13D/A | 23.61%24.7M shares | – | Oct 27, 2025 | SEC |
| Aug 1, 20256:00 PM ET | SK Inc.and 8 others | 13D/A | 25.60%26.7M shares | 0.00 ppfrom 25.60% | Jul 30, 2025 | SEC |
| Jul 17, 20256:04 AM ET | SK Inc.and 5 others | 13D/A | 25.60%26.7M shares | – | Jul 15, 2025 | SEC |
| Feb 14, 2022 | Kensico Capital Management Corp | 13GOld format | – | New | – | SEC |
| Feb 11, 2022 | Rice Acquisition Sponsor II LLC | 13GOld format | – | New | – | SEC |
| Jun 28, 2021 | Adage Capital Partners GP, L.L.C. | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Net Power Inc. shares.
No Form 144 notices for Net Power Inc. are on file.