As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of NET Power Inc. The largest reported stake is Sk Inc.'s, at 25.6%. 8 filings are on record since July 17, 2025 (Schedule 13D/A, August 1, 2025).
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Key facts
- · Reporting person: 8 Rivers Capital, LLC · Sole voting: 0 · Shared voting: 18,972,780 · Sole dispositive: 0 · Shared dispositive: 18,972,780 · SCHEDULE 13D/A, 2026-08-17
- · Holder: 8 Rivers Capital, LLC · Percent: 19.5% · SCHEDULE 13D/A
- · Holder: 8 Rivers Capital, LLC · Percent: 21.01% · SCHEDULE 13D/A
- · Holder: 8 Rivers Capital, LLC · Percent: 22.25% · SCHEDULE 13D/A
- · Holder: 8 Rivers Capital, LLC · Percent: 23.49% · SCHEDULE 13D/A
NET Power Inc. has 8 Schedule 13D or 13G filings on record since 2025-07-17. 2 holders' latest filing reports 5% or more of class a common stock, par value $0.0001. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Sk Inc. | 25.6% | 0 | SCHEDULE 13D/A, 2025-08-01 | 2025-07-30 |
| 8 Rivers Capital, LLC | 17.86% | 18,972,780 | SCHEDULE 13D/A, 2026-08-17 | 2026-08-13 |
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| 8 Rivers Capital, LLC | 0 | 18,972,780 | 0 | 18,972,780 | SCHEDULE 13D/A, 2026-08-17 |
| Npeh, LLC | 0 | 18,972,780 | 0 | 18,972,780 | SCHEDULE 13D/A, 2026-08-17 |
| Damian Beauchamp | 0 | 18,972,780 | 0 | 18,972,780 | SCHEDULE 13D/A, 2026-08-17 |
| 8rch, LLC | 0 | 0 | 0 | 0 | SCHEDULE 13D/A, 2026-08-17 |
The latest filing identifies NET Power Inc. by CUSIP 64107A105 and gives its principal executive office as 11700 Katy Freeway, Suite 700, Houston, TX 77079 (SCHEDULE 13D/A, 2026-08-17).
Purpose of Transaction (Item 4)
Sk Inc.
The information contained in Item 4 of Schedule 13D is hereby amended and supplemented by adding the following information: On July 30, 2025, SK, which directly owned 100% of each of Tillandsia, Areca and Chamaedorea, sold its interests in each of Tillandsia, Areca and Chamaedorea to Mr. Beauchamp and 8RCH. Following the Sale, Mr. Beauchamp directly owns 50% of each of Tillandsia, Areca and Chamaedorea and 8RCH directly owns 50% of Tillandsia, Areca and Chamaedorea. Following the Sale, SK no longer beneficially owns 5% or greater of the Issuer's Class A Common Stock, and is therefore no longer a Reporting Person.Item 4 of the SCHEDULE 13D/A filed 2025-08-01
8 Rivers Capital, LLC
The information contained in Item 4 of Schedule 13D is hereby amended and supplemented by adding the following information: Between May 14, 2026, and August 17, 2026, NPEH sold 1,722,100 shares of Class A Common Stock held by it.Item 4 of the SCHEDULE 13D/A filed 2026-08-17
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-17 | Sk Inc. | 25.6% | SCHEDULE 13D/A |
| 2025-08-01 | Sk Inc. | 25.6% | SCHEDULE 13D/A |
| 2025-10-29 | 8 Rivers Capital, LLC | 23.61% | SCHEDULE 13D/A |
| 2025-11-04 | 8 Rivers Capital, LLC | 23.49% | SCHEDULE 13D/A |
| 2025-12-09 | 8 Rivers Capital, LLC | 22.25% | SCHEDULE 13D/A |
| 2026-01-28 | 8 Rivers Capital, LLC | 21.01% | SCHEDULE 13D/A |
| 2026-05-14 | 8 Rivers Capital, LLC | 19.5% | SCHEDULE 13D/A |
| 2026-08-17 | 8 Rivers Capital, LLC | 17.86% | SCHEDULE 13D/A |
Questions about who owns NET Power Inc.
Who owns NET Power Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of NET Power Inc.: Sk Inc. (25.6%, Schedule 13D/A, filed 2025-08-01) and 8 Rivers Capital, LLC (17.86%, Schedule 13D/A, filed 2026-08-17).
Who are the largest shareholders of NET Power Inc.?
By the share each holder's latest filing reports, the largest holders of NET Power Inc. on this page are Sk Inc. (25.6%) and 8 Rivers Capital, LLC (17.86%).
When did Sk Inc. buy into NET Power Inc.?
The filings give report dates, not purchase dates. The earliest filing from Sk Inc. on this page is the Schedule 13D/A, filed 2025-07-17, reporting 25.6%; its latest, Schedule 13D/A filed 2025-08-01, reports 25.6%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for NET Power Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| April 13, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.