NPWR Files 4 with SEC

Q: What insider transaction did NET Power (NPWR) disclose in this Form 4?

The filing discloses that a reporting person who is a director of NET Power Inc. sold shares of the company’s Class A common stock in three separate transactions in December 2025.

Q: How many NET Power (NPWR) shares were sold in each reported transaction?

The reporting person sold 100,000 shares on 12/19/2025 , 100,000 shares on 12/22/2025 , and 130,000 shares on 12/23/2025 .

Q: At what prices were the NET Power (NPWR) shares sold in this Form 4?

The weighted average sales prices were $2.3431 on 12/19/2025, $2.2646 on 12/22/2025, and $2.1666 on 12/23/2025, each based on multiple trades within stated price ranges.

Q: How were the sale prices for the NET Power (NPWR) insider transactions calculated?

Each reported price is a weighted average sale price across multiple trades in a price range, and the reporting person has stated it will provide detailed trade-level information upon request.

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

NET Power Inc. reported insider share sales by a director-level reporting person on a Form 4. The reporting entity sold a total of 100,000 shares of Class A common stock on 12/19/2025 at a weighted average price of $2.3431, another 100,000 shares on 12/22/2025 at a weighted average price of $2.2646, and 130,000 shares on 12/23/2025 at a weighted average price of $2.1666. After these sales, the reporting person beneficially owned 2,220,000 shares of Class A common stock directly. Each price reported is a weighted average for multiple trades within stated price ranges, and the reporting person has agreed to provide full trade details upon request.

Insider Trade Summary

Net Seller: 330,000 shares ($742,428)

Net Sell 3 txns

Insider NPEH, LLC

Role 10% Owner

Sold 330,000 shs ($742K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	130,000	$2.1666	$282K
Sale	Class A Common Stock	100,000	$2.2646	$226K
Sale	Class A Common Stock	100,000	$2.3431	$234K

Holdings After Transaction: Class A Common Stock — 2,220,000 shares (Direct)

Footnotes (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 $2.305 to $2.425. 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. 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 $2.21 to $2.35. 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. 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 $2.13 to $2.235. 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.

Form 4 Insider Transactions: What Each Field Means →

12/23/2025 - 05:19 PM

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

27701

(City)

(State)

(Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
12/19/2025

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock	12/19/2025		S		100,000	D	$2.3431⁽¹⁾	2,450,000	D
Class A Common Stock	12/22/2025		S		100,000	D	$2.2646⁽²⁾	2,350,000	D
Class A Common Stock	12/23/2025		S		130,000	D	$2.1666⁽³⁾	2,220,000	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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 $2.305 to $2.425. 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 $2.21 to $2.35. 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 $2.13 to $2.235. 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	12/23/2025
	** 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.

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did NET Power (NPWR) disclose in this Form 4?

The filing discloses that a reporting person who is a director of NET Power Inc. sold shares of the company’s Class A common stock in three separate transactions in December 2025.

How many NET Power (NPWR) shares were sold in each reported transaction?

The reporting person sold 100,000 shares on 12/19/2025, 100,000 shares on 12/22/2025, and 130,000 shares on 12/23/2025.

At what prices were the NET Power (NPWR) shares sold in this Form 4?

The weighted average sales prices were $2.3431 on 12/19/2025, $2.2646 on 12/22/2025, and $2.1666 on 12/23/2025, each based on multiple trades within stated price ranges.

How many NET Power (NPWR) shares does the reporting person own after these sales?

Following the reported transactions, the reporting person beneficially owned 2,220,000 shares of NET Power Inc. Class A common stock, held directly.

Does this NET Power (NPWR) Form 4 involve any derivative securities?

No derivative securities are reported as acquired, disposed of, or beneficially owned; the derivative securities table shows no entries.

How were the sale prices for the NET Power (NPWR) insider transactions calculated?

Each reported price is a weighted average sale price across multiple trades in a price range, and the reporting person has stated it will provide detailed trade-level information upon request.