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 2 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% | Jun 20, 202311 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
29 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 |
| Nov 26, 2024 | 8 Rivers Capital, LLC | 13D/AOld format | – | – | – | SEC |
| Oct 21, 2024 | 8 Rivers Capital, LLC | 13D/AOld format | – | – | – | SEC |
| Sep 23, 2024 | 8 Rivers Capital, LLC | 13D/AOld format | – | – | – | SEC |
| May 28, 2024 | 8 Rivers Capital, LLC | 13D/AOld format | – | – | – | SEC |
| Feb 14, 2024 | Rice Acquisition Sponsor II LLC | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2024 | Kensico Capital Management Corp | 13G/AOld format | – | – | – | SEC |
| Feb 12, 2024 | Aristeia Capital LLC | 13G/AOld format | – | – | – | SEC |
| Feb 7, 2024 | Adage Capital Partners GP, L.L.C. | 13G/AOld format | – | – | – | SEC |
| Jun 30, 2023 | Daniel J. Rice, IV 2018 Irrevocable Trust | 13G/AOld format | – | – | – | SEC |
| Jun 20, 20235:00 PM ET | Occidental Petroleum Corp | 13DOld format | – | New | – | SEC |
| Jun 20, 20234:49 PM ET | Constellation Energy Generation LLC | 13DOld format | – | New | – | SEC |
| Jun 20, 2023 | Daniel J. Rice, IV 2018 Irrevocable Trust | 13GOld format | – | New | – | SEC |
| Jun 20, 2023 | 8 Rivers Capital, LLC | 13DOld format | – | New | – | SEC |
| Feb 14, 2023 | J. Goldman & Co LP | 13GOld format | – | New | – | SEC |
| Feb 14, 2023 | Aristeia Capital LLC | 13GOld format | – | New | – | SEC |
| Feb 14, 2023 | RP Investment Advisors LP | 13G/AOld format | – | – | – | SEC |
| Feb 14, 2023 | Kensico Capital Management Corp | 13G/AOld format | – | – | – | SEC |
| Jun 22, 2022 | RP Investment Advisors LP | 13GOld format | – | New | – | 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
5 notices from officers, directors and other affiliates planning to sell Net Power Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| May 30, 20254:09 PM ET | Akash PatelFormer affiliate | 35.5K | $82.1K | May 30, 2025 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Apr 3, 20254:25 PM ET | Akash PatelOfficer | 7.36K | $18.4K | Apr 3, 202510b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 22, 20244:27 PM ET | Akash PatelOfficer | 150.0K | $1.88M | Nov 22, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 19, 20248:59 PM ET | 8 Rivers Capital, LLC10% Stockholder Filer has designee on Issuer board | 1.26M | $11.5M | Nov 19, 2024 | Santander US Capital Markets LLC | SEC |
| Jul 26, 20244:51 PM ET | 8 Rivers Capital, LLC10% Stockholder Filer has designee on Issuer board | 2.52M | $24.0M | Jul 26, 2024 | Santander US Capital Markets LLC | SEC |