Net Power (NPWR) major holder sells 242,900 shares over two days

Rhea-AI Filing Summary

Net Power Inc. (NPWR) reported that major shareholder NPEH, LLC, a ten percent owner, sold an aggregate of 242,900 shares of Class A Common Stock in open-market or private transactions. On August 25, 2026, NPEH sold 201,550 shares at a weighted average price of $1.9065 per share, with individual trade prices ranging from $1.84 to $2.0091. On August 26, 2026, it sold an additional 41,350 shares at a weighted average price of $1.9124 per share, with trade prices ranging from $1.82 to $1.985. The filing notes that NPEH will provide full trade-by-trade price details to the SEC, the issuer, or any security holder upon request.

Insider Trade Summary

Net Seller: 242,900 shares

Net Sell 2 txns

Insider NPEH, LLC

Role 10% Owner

Sold 242,900 shs ($463K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F2	41,350	$1.9124	$79K
Sale	Class A Common Stock F1	201,550	$1.9065	$384K

Holdings After Transaction: Class A Common Stock — 1,000,000 shares (Direct)

Footnotes (2)

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 $1.84 to $2.0091. 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 $1.82 to $1.985. 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.

Key Figures

Shares sold on 2026-08-25: 201,550 shares of Class A Common Stock Weighted average sale price on 2026-08-25: $1.9065 per share Shares sold on 2026-08-26: 41,350 shares of Class A Common Stock +2 more

5 metrics

Shares sold on 2026-08-25 201,550 shares of Class A Common Stock Open-market or private sale by NPEH, LLC on August 25, 2026

Weighted average sale price on 2026-08-25 $1.9065 per share Average across multiple trades from $1.84 to $2.0091

Shares sold on 2026-08-26 41,350 shares of Class A Common Stock Open-market or private sale by NPEH, LLC on August 26, 2026

Weighted average sale price on 2026-08-26 $1.9124 per share Average across multiple trades from $1.82 to $1.985

Total shares sold across reported transactions 242,900 shares Combined sales by NPEH, LLC on August 25–26, 2026

Key Terms

Class A Common Stock, weighted average sales price, ten percent owner

3 terms

Class A Common Stock financial

"The shares of Class A Common Stock were sold in multiple trades"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

weighted average sales price financial

"The price reported reflects the weighted average sales price"

ten percent owner regulatory

"NPEH, LLC is marked as a ten percent owner"

FAQ

What insider transactions did NPEH, LLC report for Net Power Inc. (NPWR)?

NPEH, LLC reported selling 242,900 shares of Net Power Inc. Class A Common Stock in two transactions on August 25–26, 2026, in open-market or private sales at weighted average prices around $1.91 per share.

How many NPWR shares did NPEH, LLC sell on August 25, 2026, and at what prices?

On August 25, 2026, NPEH, LLC sold 201,550 NPWR shares at a weighted average price of $1.9065 per share. The filing states that individual trades occurred at prices ranging from $1.84 to $2.0091.

What NPWR share sale did NPEH, LLC report on August 26, 2026?

On August 26, 2026, NPEH, LLC sold 41,350 NPWR Class A Common shares at a weighted average price of $1.9124 per share, with individual trades executed between $1.82 and $1.985.

Is NPEH, LLC considered a major shareholder of Net Power Inc. (NPWR)?

Yes. NPEH, LLC is identified in the filing as a ten percent owner of Net Power Inc., meaning it is a significant shareholder for Section 16 reporting purposes.

Were the NPWR insider sales by NPEH, LLC under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5-1 checkbox is marked false, and the footnotes do not describe a trading plan, so the transactions are not reported as being made under a Rule 10b5-1 plan.

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

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Available on EDGAR 08/27/2026 - 06:03 PM Accepted by SEC EDGAR 08/27/2026 - 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^*

NPEH, 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)
08/25/2026

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

X	Form filed by One Reporting Person
	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	08/25/2026		S		201,550	D	$1.9065(1)	1,041,350	D
Class A Common Stock	08/26/2026		S		41,350	D	$1.9124(2)	1,000,000	D

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

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 $1.84 to $2.0091. 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 $1.82 to $1.985. 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.

	By: /s/ Min Lee, General Counsel of 8 Rivers Capital, LLC, its Manager	08/27/2026
	** 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)