If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




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SCHEDULE 13D




Comment for Type of Reporting Person:
Row 8, 10 and 11. Beneficial ownership of shares of Class A common stock, par value $0.0001 per share ("Class A Common Stock"), of NET Power Inc. (the "Issuer") is being reported hereunder solely because the reporting person may be deemed to have beneficial ownership of such shares as a result of the relationships described under Item 2 and Item 3 and the matters described in Item 3, Item 4 and Item 5 of Schedule 13D (as defined below), as amended by this Amendment No. 12 (as defined below). Represents (i) 1,242,900 shares of Class A Common Stock held directly by NPEH and (ii) 17,729,880 Class A Units of NET Power Operations LLC ("Opco Units") held directly by NPEH, LLC ("NPEH"), that are exchangeable for shares of Class A Common Stock on a one-for-one basis as described herein. At the time of any such exchange, an equal number of shares of Class B common stock, par value $0.0001 per share ("Class B Common Stock"), of the Issuer held directly by NPEH, which have no economic value, will be cancelled. Row 13. Based upon (i) 88,480,681 shares of Class A Common Stock issued and outstanding as of August 11, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on August 13, 2026 (the "Issuer Form 10-Q"), and (ii) 1,242,900 shares of Class A Common Stock held directly by NPEH and 17,729,880 shares of Class A Common Stock issuable to NPEH upon the redemption and exchange of an equal number of Opco Units (and the cancellation of an equal number of shares of Class B Common Stock) held by NPEH.


SCHEDULE 13D




Comment for Type of Reporting Person:
Row 8, 10 and 11. Represents 1,242,900 shares of Class A Common Stock and 17,729,880 Opco Units held directly by NPEH that are exchangeable for shares of Class A Common Stock on a one-for-one basis as described herein. At the time of any such exchange, an equal number of shares of Class B Common Stock held directly by NPEH, which have no economic value, will be cancelled. Row 13. Based upon (i) 88,480,681 shares of Class A Common Stock issued and outstanding as of August 11, 2026, as reported in the Issuer Form 10-Q and (ii) 1,242,900 shares of Class A Common Stock held directly by NPEH and 17,729,880 shares of Class A Common Stock issuable to NPEH upon the redemption and exchange of an equal number of Opco Units (and the cancellation of an equal number of shares of Class B Common Stock) held by NPEH.


SCHEDULE 13D




Comment for Type of Reporting Person:
Rows 8, 10 and 11: Mr. Beauchamp directly owns 100% of the outstanding equity of each of Tillandsia, Inc. ("Tillandsia"), Areca, Inc. ("Areca"), and Chamaedorea, Inc. ("Chamaedorea"). Each of Tillandsia, Areca and Chamaedorea directly owns approximately 17.30%, 23.97% and 22.42%, respectively, or an aggregate of approximately 63.70% of the voting units of 8 Rivers Capital, LLC ("8 Rivers"), and Mr. Beauchamp directly owns approximately 3.83% of the voting units of 8 Rivers. 8 Rivers owns approximately 90.8% of the outstanding equity of NPEH and is the manager of NPEH and may be deemed to beneficially own the shares of Class A Common Stock issuable to NPEH upon the redemption and exchange of an equal number of Opco Units (and the cancellation of an equal number of shares of Class B Common Stock) held by NPEH. Because of the foregoing relationships, Mr. Beauchamp may be deemed to beneficially own the shares of Class A Common Stock that may be beneficially owned by 8 Rivers. Row 13: Based upon (i) 88,480,681 shares of Class A Common Stock issued and outstanding as of August 11, 2026, as reported in the Issuer Form 10-Q and (ii) 1,242,900 shares of Class A Common Stock held directly by NPEH and 17,729,880 shares of Class A Common Stock issuable to NPEH upon the redemption and exchange of an equal number of Opco Units (and the cancellation of an equal number of shares of Class B Common Stock) held by NPEH.


SCHEDULE 13D




Comment for Type of Reporting Person:
Rows 8, 10, 11 and 13: As of August 17, 2026, Mr. Beauchamp directly owns 100% of the outstanding equity of each of Tillandsia, Areca, and Chamaedorea, pursuant to an assignment of 50% the outstanding equity of each of Tillandsia, Areca, and Chamaedorea by 8RCH, LLC ("8RCH") to Mr. Beauchamp (the "Assignment"). Following the Assignment, 8RCH no longer beneficially owns 5% or greater of the Issuer's Class A Common Stock, and is therefore no longer a Reporting Person.


SCHEDULE 13D


 
8 RIVERS CAPITAL, LLC
 
Signature:/s/ Min Lee
Name/Title:Min Lee, General Counsel
Date:08/17/2026
 
NPEH, LLC
 
Signature:/s/ Min Lee
Name/Title:Min Lee, General Counsel / By: 8 Rivers Capital, LLC, its Manager
Date:08/17/2026
 
DAMIAN BEAUCHAMP
 
Signature:/s/ Damian Beauchamp
Name/Title:Damian Beauchamp
Date:08/17/2026
 
8RCH, LLC
 
Signature:/s/ Damian Beauchamp
Name/Title:Damian Beauchamp, Authorized Person
Date:08/17/2026