NPEH LLC sells 209,142 NET Power Class A shares

NPEH, LLC, a ten percent owner of NET Power Inc., reported sales totaling 209,142 shares of Class A Common Stock on July 21–23, 2026.

Rhea-AI Filing Summary

NPEH, LLC, a ten percent owner of NET Power Inc., reported sales totaling 209,142 shares of Class A Common Stock on July 21–23, 2026. The trades used weighted-average prices of $1.53, $1.5258, and $1.5066 per share, with individual trades between $1.50 and $1.56.

Insider Trade Summary

Net Seller: 209,142 shares

Net Sell 3 txns

Insider NPEH, LLC

Role 10% Owner

Sold 209,142 shs ($319K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F3	39,142	$1.5066	$59K
Sale	Class A Common Stock F2	90,000	$1.5258	$137K
Sale	Class A Common Stock F1	80,000	$1.53	$122K

Holdings After Transaction: Class A Common Stock — 2,755,858 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 $1.50 to $1.555. 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 $1.56. 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.

Key Figures

Shares sold 2026-07-21: 80,000 shares Shares sold 2026-07-22: 90,000 shares Shares sold 2026-07-23: 39,142 shares +4 more

7 metrics

Shares sold 2026-07-21 80,000 shares Class A Common Stock sale on July 21, 2026 at weighted-average $1.53 per share

Shares sold 2026-07-22 90,000 shares Class A Common Stock sale on July 22, 2026 at weighted-average $1.5258 per share

Shares sold 2026-07-23 39,142 shares Class A Common Stock sale on July 23, 2026 at weighted-average $1.5066 per share

Total shares sold 209,142 shares Aggregate NET Power Inc. Class A Common Stock sold July 21–23, 2026

Price range July 21 trades $1.50–$1.555 per share Range of individual trade prices for July 21, 2026 sales

Price range July 22 trades $1.50–$1.56 per share Range of individual trade prices for July 22, 2026 sales

Price range July 23 trades $1.50–$1.52 per share Range of individual trade prices for July 23, 2026 sales

Key Terms

weighted average sales price, ten percent owner, open market or private transaction, Rule 10b5-1

4 terms

weighted average sales price financial

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

ten percent owner regulatory

"NPEH, LLC is identified as a ten percent owner of NET Power Inc."

open market or private transaction financial

"Transaction code S is described as a sale in open market or private transaction."

Rule 10b5-1 regulatory

"The Rule 10b5-1 checkbox was not marked as affirming a trading plan."

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

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

What insider sales did NPEH, LLC report for NET Power Inc. (NPWR)?

NPEH, LLC reported selling a total of 209,142 shares of NET Power Inc. Class A Common Stock over three days. The transactions occurred on July 21, 22 and 23, 2026, as reflected in the Form 4 insider trading report.

On which dates did NPEH, LLC sell NET Power (NPWR) shares and how many each day?

NPEH, LLC sold 80,000 shares on July 21, 90,000 shares on July 22, and 39,142 shares on July 23, 2026. All transactions involved NET Power Inc. Class A Common Stock held directly by NPEH, LLC.

What prices did NPEH, LLC receive for its NET Power (NPWR) share sales?

The reported prices are weighted averages of multiple trades: $1.53 per share on July 21, $1.5258 on July 22, and $1.5066 on July 23, 2026. Individual trades ranged between $1.50 and $1.56 per share.

How is NPEH, LLC related to NET Power Inc. (NPWR) in this insider report?

NPEH, LLC is identified as a ten percent owner of NET Power Inc. in the insider report. The entity, rather than an individual officer or director, is the reporting person for these Class A Common Stock sale transactions.

Were NPEH, LLC’s NET Power (NPWR) sales under a Rule 10b5-1 trading plan?

The Rule 10b5-1 checkbox was not marked as affirming a trading plan for these transactions. Footnotes instead highlight that reported prices are weighted averages based on multiple trades within stated price ranges.

What do the weighted-average price footnotes mean in the NPEH, LLC NET Power (NPWR) filing?

Each reported price is a weighted average sales price across multiple trades. Footnotes state that trades occurred within specified ranges, roughly $1.50–$1.56, and NPEH, LLC will provide exact per-trade details to interested parties upon request.

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

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Accepted by SEC EDGAR 07/23/2026 - 07:37 PM EDT 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)
07/21/2026

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	07/21/2026		S		80,000	D	$1.53(1)	2,885,000	D
Class A Common Stock	07/22/2026		S		90,000	D	$1.5258(2)	2,795,000	D
Class A Common Stock	07/23/2026		S		39,142	D	$1.5066(3)	2,755,858	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 $1.50 to $1.555. 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 $1.56. 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.

	By: /s/ Min Lee, General Counsel of 8 Rivers Capital, LLC, its Manager	07/23/2026
	** 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)