NET Power holder NPEH sells 255,858 shares

NPEH, LLC, a ten percent owner of NET Power Inc., reported selling an aggregate 255,858 shares of Class A Common Stock in open-market or private transactions on July 28–30, 2026.

Rhea-AI Filing Summary

NPEH, LLC, a ten percent owner of NET Power Inc., reported selling an aggregate 255,858 shares of Class A Common Stock in open-market or private transactions on July 28–30, 2026. The sales were executed at weighted-average prices of $1.4721, $1.4073 and $1.4284 per share across multiple trades within stated price ranges. The prices reported are weighted averages, and detailed trade-level prices are available from NPEH on request.

Insider Trade Summary

Net Seller: 255,858 shares

Net Sell 3 txns

Insider NPEH, LLC

Role 10% Owner

Sold 255,858 shs ($367K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F3	155,000	$1.4284	$221K
Sale	Class A Common Stock F2	45,000	$1.4073	$63K
Sale	Class A Common Stock F1	55,858	$1.4721	$82K

Holdings After Transaction: Class A Common Stock — 2,500,000 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 $1.415 to $1.495. 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 $1.40 to $1.41. 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 $1.40 to $1.47. 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 2026-07-28: 55,858 shares Shares sold 2026-07-29: 45,000 shares Shares sold 2026-07-30: 155,000 shares +1 more

4 metrics

Shares sold 2026-07-28 55,858 shares Class A Common Stock sale at weighted-average $1.4721 per share

Shares sold 2026-07-29 45,000 shares Class A Common Stock sale at weighted-average $1.4073 per share

Shares sold 2026-07-30 155,000 shares Class A Common Stock sale at weighted-average $1.4284 per share

Total shares sold 255,858 shares Aggregate Class A Common Stock sales July 28–30, 2026 by NPEH, LLC

Key Terms

weighted average sales price, ten percent owner, open market or private transaction

3 terms

weighted average sales price financial

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

ten percent owner regulatory

"NPEH, LLC is indicated as a ten percent owner of the issuer."

open market or private transaction financial

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

FAQ

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

Who sold NET Power (NPWR) shares in this insider transaction?

NPEH, LLC, identified as a ten percent owner of NET Power Inc., reported the sales. The entity disclosed open-market or private transactions in the company’s Class A Common Stock over several days, rather than trades by an individual executive.

How many NET Power (NPWR) shares did NPEH, LLC sell and over what dates?

NPEH, LLC reported selling 255,858 shares of NET Power Class A Common Stock. The transactions occurred over three consecutive days: 55,858 shares on July 28, 45,000 shares on July 29, and 155,000 shares on July 30, 2026.

At what prices were the NET Power (NPWR) shares sold by NPEH, LLC?

The reported weighted-average prices per share were $1.4721 on July 28, $1.4073 on July 29, and $1.4284 on July 30, 2026. Each day’s sales were executed through multiple trades within specified price ranges, as described in the footnotes.

What do the weighted-average prices in NPEH, LLC’s NET Power (NPWR) sales represent?

The weighted-average sales prices reflect multiple individual trades combined into a single average figure for reporting. Footnotes explain that trades occurred within stated price ranges, and NPEH, LLC will provide full trade-by-trade pricing details to regulators, the issuer or its security holders upon request.

What type of transactions did NPEH, LLC report for NET Power (NPWR) shares?

NPEH, LLC reported sales of Class A Common Stock coded as “S,” described as sales in open market or private transactions. All three entries in the report involve non-derivative common stock rather than options or other derivative securities.

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

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Available on EDGAR 07/30/2026 - 06:01 PM Accepted by SEC EDGAR 07/30/2026 - 06:00 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)
07/28/2026

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	07/28/2026		S		55,858	D	$1.4721(1)	2,700,000	D
Class A Common Stock	07/29/2026		S		45,000	D	$1.4073(2)	2,655,000	D
Class A Common Stock	07/30/2026		S		155,000	D	$1.4284(3)	2,500,000	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 $1.415 to $1.495. 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 $1.40 to $1.41. 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 $1.40 to $1.47. 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	07/30/2026
	** 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)