Net Power holder sells 250K shares below $2

A ten percent owner of Net Power Inc. reported open‑market sales totaling 250,000 Class A shares over two days.

Rhea-AI Filing Summary

Net Power Inc. (NPWR) had shares of its Class A Common Stock sold by major shareholder NPEH, LLC, a ten percent owner. NPEH sold 100,000 shares on September 8, 2026 at a weighted average price of $1.9352 per share and 150,000 shares on September 9, 2026 at a weighted average price of $1.8405 per share, in multiple trades within the stated price ranges. The filing indicates these transactions were not made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Seller: 250,000 shares

Net Sell 2 txns

Insider NPEH, LLC

Role 10% Owner

Sold 250,000 shs ($470K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F2	150,000	$1.8405	$276K
Sale	Class A Common Stock F1	100,000	$1.9352	$194K

Holdings After Transaction: Class A Common Stock — 750,000 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 $1.87 to $2.00. 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 $1.77 to $1.885. 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 September 8, 2026: 100,000 shares Weighted average price September 8, 2026: $1.9352 per share Shares sold September 9, 2026: 150,000 shares +3 more

6 metrics

Shares sold September 8, 2026 100,000 shares Class A Common Stock sold by NPEH, LLC

Weighted average price September 8, 2026 $1.9352 per share Sales of NPWR Class A Common Stock in multiple trades from $1.87 to $2.00

Shares sold September 9, 2026 150,000 shares Class A Common Stock sold by NPEH, LLC

Weighted average price September 9, 2026 $1.8405 per share Sales of NPWR Class A Common Stock in multiple trades from $1.77 to $1.885

Total shares sold 250,000 shares Aggregate of reported Class A Common Stock sales by NPEH, LLC

Insider status Ten percent owner NPEH, LLC’s relationship to Net Power Inc.

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 the issuer"

FAQ

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

What insider activity did NPWR report in this Form 4?

Net Power Inc. reported that NPEH, LLC, a ten percent owner, sold 250,000 shares of Class A Common Stock in open-market style transactions on September 8–9, 2026 at weighted average prices of $1.9352 and $1.8405 per share, respectively.

Who is the reporting person in Net Power Inc. (NPWR)'s latest Form 4?

The reporting person is NPEH, LLC, identified as a ten percent owner of Net Power Inc. It reported sales of the company’s Class A Common Stock and is treated as a major shareholder under SEC ownership rules.

How many NPWR shares did NPEH, LLC sell on September 8, 2026 and at what price?

On September 8, 2026, NPEH, LLC sold 100,000 shares of Net Power Inc. Class A Common Stock at a weighted average price of $1.9352 per share, with individual trade prices ranging from $1.87 to $2.00.

What were the details of NPEH, LLC's NPWR share sale on September 9, 2026?

On September 9, 2026, NPEH, LLC sold 150,000 shares of Net Power Inc. Class A Common Stock at a weighted average price of $1.8405 per share, with individual trades priced between $1.77 and $1.885.

Were the reported NPWR insider sales made under a Rule 10b5-1 trading plan?

No. The Form 4 indicates the Rule 10b5‑1 checkbox is not marked, so these sales by NPEH, LLC are not reported as being made under a Rule 10b5‑1 trading plan.

Can investors get the exact trade breakdown for NPEH, LLC's NPWR sales?

Yes. The filing states that NPEH, LLC will provide the SEC, Net Power Inc., or any security holder, upon request, with full information on the number of shares sold at each separate price within the reported price ranges.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 09/10/2026 - 06:00 PM EDT Accepted by SEC EDGAR 09/10/2026 - 06:00 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)
09/08/2026

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	09/08/2026		S		100,000	D	$1.9352(1)	900,000	D
Class A Common Stock	09/09/2026		S		150,000	D	$1.8405(2)	750,000	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 $1.87 to $2.00. 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 $1.77 to $1.885. 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	09/10/2026
	** 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)