NET Power holder 8 Rivers sells 349,255 shares

NET Power Inc. major shareholder 8 Rivers Capital, LLC, together with Damian R. Beauchamp as an indirect reporting person, reported three indirect sales of Class A Common Stock held by NPEH, LLC.

Rhea-AI Filing Summary

NET Power Inc. major shareholder 8 Rivers Capital, LLC, together with Damian R. Beauchamp as an indirect reporting person, reported three indirect sales of Class A Common Stock held by NPEH, LLC. Between August 4 and 6, 2026, NPEH sold a total of 349,255 shares at weighted average prices of $1.5394, $1.5104 and $1.5062 per share, with underlying trades ranging from $1.50 to $1.55 on August 4–5 and $1.50 to $1.52 on August 6. 8 Rivers and Mr. Beauchamp may be deemed beneficial owners through their interests in NPEH but each disclaims beneficial ownership beyond their pecuniary interests.

Insider Trade Summary

Net Seller: 349,255 shares

Net Sell 3 txns

Insider 8 Rivers Capital, LLC, BEAUCHAMP DAMIAN R.

Role 10% Owner | 10% Owner

Sold 349,255 shs ($531K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F3, F4, F5	89,255	$1.5062	$134K
Sale	Class A Common Stock F2, F4, F5	140,000	$1.5104	$211K
Sale	Class A Common Stock F1, F4, F5	120,000	$1.5394	$185K

Holdings After Transaction: Class A Common Stock — 2,150,745 shares (Indirect, By: NPEH, LLC)

Footnotes (5)

1. F1. The price reported reflects the weighted average sales price. The shares of Class A Common Stock were sold in multiple trades at prices ranging from $1.50 to $1.55. NPEH, LLC ("NPEH"), will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.
2. F2. The price reported reflects the weighted average sales price. The shares of Class A Common Stock were sold in multiple trades at prices ranging from $1.50 to $1.55. NPEH will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.
3. F3. The price reported reflects the weighted average sales price. The shares of Class A Common Stock were sold in multiple trades at prices ranging from $1.50 to $1.52. NPEH will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.
4. F4. 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.
5. F5. Damian R. Beauchamp ("Mr. Beauchamp") independently indirectly owns approximately 63.70% 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.

Key Figures

Total shares sold: 349,255 shares Shares sold on 2026-08-04: 120,000 shares Shares sold on 2026-08-05: 140,000 shares +3 more

6 metrics

Total shares sold 349,255 shares Aggregate Class A Common Stock sold indirectly by NPEH, LLC across August 4–6, 2026

Shares sold on 2026-08-04 120,000 shares Indirect sale of Class A Common Stock by NPEH, LLC at $1.5394 weighted average price

Shares sold on 2026-08-05 140,000 shares Indirect sale of Class A Common Stock by NPEH, LLC at $1.5104 weighted average price

Shares sold on 2026-08-06 89,255 shares Indirect sale of Class A Common Stock by NPEH, LLC at $1.5062 weighted average price

Price range 2026-08-04 and 2026-08-05 $1.50 to $1.55 per share Range of multiple trade prices underlying weighted averages on August 4 and 5, 2026

Price range 2026-08-06 $1.50 to $1.52 per share Range of multiple trade prices underlying weighted average on August 6, 2026

Key Terms

weighted average sales price, beneficial owner, pecuniary interest, indirect beneficial owner

4 terms

weighted average sales price financial

"The price reported reflects the weighted average sales price."

beneficial owner regulatory

"8 Rivers may be deemed to be a beneficial owner of the securities"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

pecuniary interest regulatory

"disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest"

indirect beneficial owner regulatory

"Mr. Beauchamp may be deemed the indirect beneficial owner of the securities owned by NPEH"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did NET Power (NPWR) report on this Form 4?

NET Power reported that NPEH, LLC, an entity associated with 8 Rivers Capital, sold a total of 349,255 shares of Class A Common Stock over three days in August 2026, in open-market or private transactions at weighted average prices of $1.5394, $1.5104 and $1.5062 per share.

Who executed the NET Power (NPWR) share sales reported in this filing?

The sales were of shares owned by NPEH, LLC. 8 Rivers Capital, LLC manages NPEH and holds about 90.9% of its equity, so it may be deemed a beneficial owner. Damian R. Beauchamp indirectly and directly owns stakes in 8 Rivers and may also be deemed an indirect beneficial owner.

At what prices were NET Power (NPWR) shares sold in these insider transactions?

On August 4, 2026, 120,000 shares sold at a weighted average of $1.5394, with trades from $1.50 to $1.55. On August 5, 140,000 shares sold at $1.5104 within the same range. On August 6, 89,255 shares sold at $1.5062, with trades from $1.50 to $1.52.

How are 8 Rivers Capital and Damian R. Beauchamp linked to NET Power (NPWR) shares?

8 Rivers Capital is manager and holder of approximately 90.9% of NPEH, LLC’s equity, so it may be deemed a beneficial owner of NPEH’s NET Power shares. Damian R. Beauchamp independently indirectly owns about 63.70% and directly owns about 3.83% of 8 Rivers, giving him an economic interest in NPEH’s holdings.

Were the NET Power (NPWR) insider sales reported under a Rule 10b5-1 trading plan?

The transactions are reported as open-market or private sales of Class A Common Stock. The Rule 10b5‑1 trading plan checkbox is not marked, and the footnotes do not state that the sales were executed under any pre-arranged trading plan.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/06/2026 - 06:02 PM Accepted by SEC EDGAR 08/06/2026 - 06:02 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

8 Rivers Capital, LLC

(Last) (First) (Middle)

406 BLACKWELL STREET, 4TH FLOOR

(Street)

DURHAM NORTH CAROLINA 27701

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
NET Power Inc. [ NPWR ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	08/04/2026		S		120,000	D	$1.5394(1)	2,380,000	I	By: NPEH, LLC(4)(5)
Class A Common Stock	08/05/2026		S		140,000	D	$1.5104(2)	2,240,000	I	By: NPEH, LLC(4)(5)
Class A Common Stock	08/06/2026		S		89,255	D	$1.5062(3)	2,150,745	I	By: NPEH, LLC(4)(5)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

8 Rivers Capital, LLC

(Last) (First) (Middle)

406 BLACKWELL STREET, 4TH FLOOR

(Street)

DURHAM NORTH CAROLINA 27701

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

BEAUCHAMP DAMIAN R.

(Last) (First) (Middle)

406 BLACKWELL STREET, 4TH FLOOR

(Street)

DURHAM NORTH CAROLINA 27701

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. The price reported reflects the weighted average sales price. The shares of Class A Common Stock were sold in multiple trades at prices ranging from $1.50 to $1.55. NPEH, LLC ("NPEH"), will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

2. The price reported reflects the weighted average sales price. The shares of Class A Common Stock were sold in multiple trades at prices ranging from $1.50 to $1.55. NPEH will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

3. The price reported reflects the weighted average sales price. The shares of Class A Common Stock were sold in multiple trades at prices ranging from $1.50 to $1.52. NPEH will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

4. 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.

5. Damian R. Beauchamp ("Mr. Beauchamp") independently indirectly owns approximately 63.70% 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.

	By: /s/ Min Lee, General Counsel of 8 Rivers Capital, LLC	08/06/2026
	By: /s/ Damian R. Beauchamp	08/06/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)