8 Rivers Capital, LLC - 06 Mar 2026 Form 4/A - Amendment Insider Report for NET Power Inc. (NPWR)

Reporting relationship: 10%+ Owner
Issuer ticker: NPWR
Reported as of: 06 Mar 2026
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 13 May 2026, 16:22:18 UTC
Original report date: 10 Mar 2026
Prior SEC filing: 05 Mar 2026
Next SEC filing: 14 May 2026
Source filing: View source filing
Reporting owner signature: By: /s/ Min Lee, General Counsel of 8 Rivers Capital, LLC

Key filing fact

8 Rivers Capital, LLC filed Form 4/A - Amendment for NET Power Inc. (NPWR) on 13 May 2026.

Key facts

This page summarizes 8 Rivers Capital, LLC's Form 4/A - Amendment filing for NET Power Inc. (NPWR).
3 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 13 May 2026, 16:22.

Change

Previous filing in this sequence was filed on 05 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4/A - Amendment disclosures.

View source filing

Reporting Owners (2)

CIK 0001981100 Primary reporting owner

8 Rivers Capital, LLC

Relationship: 10%+ Owner
Address: 406 BLACKWELL STREET, 4TH FLOOR, DURHAM
Signature: By: /s/ Min Lee, General Counsel of 8 Rivers Capital, LLC
Signature date: 13 May 2026

CIK 0001973442

BEAUCHAMP DAMIAN R.

Relationship: 10%+ Owner
Address: 406 BLACKWELL STREET, 4TH FLOOR, DURHAM
Signature: By: /s/ Damian R. Beauchamp
Signature date: 13 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

NPWR transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,000,000
Change %: +750%
Price
Shares after: 3,400,000
Date: 06 Mar 2026
Ownership: By: NPEH, LLC
Footnotes: F1, F3, F4

NPWR transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares: +3,000,000
Change %: +750%
Price
Shares after: 3,400,000
Date: 06 Mar 2026
Ownership: By: NPEH, LLC
Footnotes: F1, F3, F4

NPWR transaction

Class B Common Stock

Other

Transaction value
Shares: -3,000,000
Change %: -14%
Price
Shares after: 17,729,880
Date: 06 Mar 2026
Ownership: By: NPEH, LLC
Footnotes: F2, F3, F4

NPWR transaction

Class B Common Stock

Other

Transaction value
Shares: -3,000,000
Change %: -14%
Price
Shares after: 17,729,880
Date: 06 Mar 2026
Ownership: By: NPEH, LLC
Footnotes: F2, F3, F4

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

NPWR transaction Derivative

Class A Units of NET Power Operations LLC

Conversion of derivative security

Transaction value
Shares: -3,000,000
Change %: -14%
Price
Shares after: 17,729,880
Date: 06 Mar 2026
Ownership: By: NPEH, LLC
Underlying class: Class A Common Stock
Underlying amount: 3,000,000
Exercise price
Footnotes: F1, F3, F4, F5

NPWR transaction Derivative

Class A Units of NET Power Operations LLC

Conversion of derivative security

Transaction value
Shares: -3,000,000
Change %: -14%
Price
Shares after: 17,729,880
Date: 06 Mar 2026
Ownership: By: NPEH, LLC
Underlying class: Class A Common Stock
Underlying amount: 3,000,000
Exercise price
Footnotes: F1, F3, F4, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

The Class A Units of NET Power Operations LLC are exchangeable into shares of the Issuer's Class A Common Stock or, at the Issuer's election, cash, on a one-for-one basis and have no expiration date. On March 6, 2026, NPEH exchanged 3,000,000 Class A Units of NET Power Operations LLC for 3,000,000 shares of the Issuer's Class A Common Stock.

Footnote F2

For each Class A Unit of Net Power Operations LLC, NPEH owns a corresponding share of Class B Common Stock of the Issuer. Upon the exchange of 3,000,000 Class A Units of Net Power Operations LLC, an equal number of shares of Class B Common Stock of the Issuer held by NPEH, which have no economic value, were cancelled.

Footnote F3

As manager and holder of approximately 90.9% of the outstanding equity in NPEH, 8 Rivers Capital, LLC ("8 Rivers") may be deemed to be a beneficial owner of the securities directly owned by NPEH. 8 Rivers disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein, if any, and this report shall not be deemed an admission that 8 Rivers is the beneficial owner of such securities for purposes of Section 16 or otherwise.

Footnote F4

Damian R. Beauchamp ("Mr. Beauchamp") independently indirectly owns approximately 63.72% of 8 Rivers, and Mr. Beauchamp directly owns approximately 3.83% of 8 Rivers. Accordingly, Mr. Beauchamp may be deemed the indirect beneficial owner of the securities owned by NPEH to the extent of his pecuniary interest therein. Mr. Beauchamp disclaims beneficial ownership of any such securities, except to the extent of his or her pecuniary interest therein, if any, and this report shall not be deemed an admission that Mr. Beauchamp is the beneficial owner of such securities for purposes of Section 16 or otherwise.

Footnote F5

This amendment is being filed to correct an administrative error in the Form 4 filed on March 10, 2026 (the "Original Form 4") and report the 3,000,000 Class A Units of NET Power Operations LLC that were converted into an equal number of shares of the Issuer's Class A Common Stock as being disposed of by the Reporting Person. The Original Form 4 inadvertently omitted such Class A Units from Table II.