NPEH, LLC trims Net Power (NPWR) stake with 757,100-share open-market sales

Rhea-AI Filing Summary

NPEH, LLC, a ten percent owner of Net Power Inc., reported three open-market sales of Class A Common Stock. On August 12, 2026 it sold 50,000 shares at a weighted average price of $1.6315 (trades from $1.62–$1.665); on August 13 it sold 200,000 shares at $1.6192 (from $1.585–$1.65); and on August 14 it sold 507,100 shares at $1.9533 (from $1.85–$2.06). Each price reflects a weighted average across multiple trades.

Insider Trade Summary

Net Seller: 757,100 shares

Net Sell 3 txns

Insider NPEH, LLC

Role 10% Owner

Sold 757,100 shs ($1.40M)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F3	507,100	$1.9533	$991K
Sale	Class A Common Stock F2	200,000	$1.6192	$324K
Sale	Class A Common Stock F1	50,000	$1.6315	$82K

Holdings After Transaction: Class A Common Stock — 1,242,900 shares (Direct)

Footnotes (3)

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 $1.62 to $1.665. 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 $1.585 to $1.65. 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 $1.85 to $2.06. 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

Total shares sold: 757,100 shares Shares sold on 2026-08-12: 50,000 shares Weighted average price 2026-08-12: $1.6315 per share +4 more

7 metrics

Total shares sold 757,100 shares Aggregate of three sales by NPEH, LLC between August 12–14, 2026

Shares sold on 2026-08-12 50,000 shares Class A Common Stock sold by NPEH, LLC at $1.6315 weighted average

Weighted average price 2026-08-12 $1.6315 per share Multiple trades in range $1.62–$1.665

Shares sold on 2026-08-13 200,000 shares Class A Common Stock sold by NPEH, LLC at $1.6192 weighted average

Price range 2026-08-13 $1.585–$1.65 Multiple trades underlying weighted average price

Shares sold on 2026-08-14 507,100 shares Class A Common Stock sold by NPEH, LLC at $1.9533 weighted average

Price range 2026-08-14 $1.85–$2.06 Multiple trades underlying weighted average price

Key Terms

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

3 terms

weighted average sales price financial

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

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.

ten percent owner regulatory

"NPEH, LLC is identified as a ten percent owner of Net Power"

FAQ

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

NPEH, LLC reported three open-market sales of Net Power Class A Common Stock totaling 757,100 shares between August 12–14, 2026, at weighted average prices between $1.62 and $1.95, each executed across multiple trades within stated price ranges.

How many Net Power (NPWR) shares did NPEH, LLC sell on each date?

NPEH, LLC sold 50,000 shares on August 12, 200,000 shares on August 13, and 507,100 shares on August 14, 2026. All transactions involved Net Power’s Class A Common Stock in open-market or private transactions.

At what prices did NPEH, LLC sell Net Power (NPWR) shares?

The reported prices are weighted average sales prices: $1.6315 on August 12, $1.6192 on August 13, and $1.9533 on August 14, 2026. Footnotes state actual trades ranged between $1.585 and $2.06, depending on the date.

Were NPEH, LLC’s Net Power (NPWR) sales executed in multiple trades?

Yes. Footnotes state each day’s Net Power Class A Common Stock sales were completed in multiple trades within specified price ranges. The reported per-share prices are weighted averages, and NPEH, LLC will provide detailed trade breakdowns upon request.

Does the Form 4 show NPEH, LLC’s remaining Net Power (NPWR) holdings?

The Form 4 reports the shares sold by NPEH, LLC but does not state a post-transaction share balance in the data provided. The filing focuses on the three reported sales and their weighted average prices and ranges.

Is NPEH, LLC an insider or large holder of Net Power (NPWR)?

Yes. NPEH, LLC is identified as a ten percent owner of Net Power Inc. This status requires it to file Form 4 reports when it conducts transactions in the company’s securities, such as the reported August 2026 stock sales.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/14/2026 - 06:02 PM Accepted by SEC EDGAR 08/14/2026 - 06:01 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)
08/12/2026

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	08/12/2026		S		50,000	D	$1.6315(1)	1,950,000	D
Class A Common Stock	08/13/2026		S		200,000	D	$1.6192(2)	1,750,000	D
Class A Common Stock	08/14/2026		S		507,100	D	$1.9533(3)	1,242,900	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 $1.62 to $1.665. 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 $1.585 to $1.65. 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 $1.85 to $2.06. 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	08/14/2026
	** 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)