NET Power (NPWR) 10% owner NPEH offloads 349,255 Class A shares

Rhea-AI Filing Summary

NPEH, LLC, a 10% owner of NET Power Inc., reported selling 349,255 shares of Class A Common Stock over three days in August 2026 in open market or private transactions. The weighted average prices were $1.5394, $1.5104 and $1.5062, with individual trades between $1.50–$1.55 and $1.50–$1.52.

Insider Trade Summary

Net Seller: 349,255 shares

Net Sell 3 txns

Insider NPEH, LLC

Role 10% Owner

Sold 349,255 shs ($531K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock F3	89,255	$1.5062	$134K
Sale	Class A Common Stock F2	140,000	$1.5104	$211K
Sale	Class A Common Stock F1	120,000	$1.5394	$185K

Holdings After Transaction: Class A Common Stock — 2,150,745 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 $1.55. 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 $1.55. 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

Total shares sold: 349255 shares Sale on 2026-08-04: 120000 shares at $1.5394 per share Sale on 2026-08-05: 140000 shares at $1.5104 per share +1 more

4 metrics

Total shares sold 349255 shares Net shares sold by NPEH, LLC across the reported transactions

Sale on 2026-08-04 120000 shares at $1.5394 per share Weighted average price; trades ranged from $1.50 to $1.55 as noted in footnote F1

Sale on 2026-08-05 140000 shares at $1.5104 per share Weighted average price; trades ranged from $1.50 to $1.55 as noted in footnote F2

Sale on 2026-08-06 89255 shares at $1.5062 per share Weighted average price; trades ranged from $1.50 to $1.52 as noted in footnote F3

Key Terms

Class A Common Stock, weighted average sales price, open market or private transaction

3 terms

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.

weighted average sales price financial

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

open market or private transaction financial

"Sale in open market or private transaction"

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 08/06/2026 - 06:01 PM Accepted by SEC EDGAR 08/06/2026 - 06:01 PM Learn about SEC filing dates

FAQ

What did NPEH, LLC report in its Form 4 filing for NET Power (NPWR)?

NPEH, LLC reported selling 349,255 shares of NET Power Class A Common Stock over three days in August 2026. The sales were reported as open market or private transactions at weighted average prices around $1.51 per share, with detailed price ranges disclosed.

How many NPWR shares did NPEH, LLC sell on each reported date?

NPEH, LLC sold 120,000 shares on 2026-08-04, 140,000 shares on 2026-08-05, and 89,255 shares on 2026-08-06. Each day’s sales are reported with a specific weighted average price and footnotes describing the underlying trade price ranges.

At what prices were the NPWR shares sold by NPEH, LLC?

The reported weighted average prices were $1.5394 (2026-08-04), $1.5104 (2026-08-05) and $1.5062 (2026-08-06). Footnotes explain that individual trades ranged from $1.50–$1.55 on two days and $1.50–$1.52 on the other day.

Is NPEH, LLC a major shareholder of NET Power (NPWR)?

Yes. NPEH, LLC is identified in the data as a ten percent owner of NET Power Inc. This status makes NPEH, LLC a reporting person for Section 16 purposes, requiring disclosure of its trades in NPWR equity securities on Form 4.

Were NPEH, LLC’s NPWR share sales made under a Rule 10b5-1 trading plan?

The Form 4 data indicate the Rule 10b5-1 checkbox is not marked as affirmative, and the footnotes describe pricing details but do not reference any trading plan. The filing therefore does not state that these transactions were executed under a Rule 10b5-1 plan.

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)
08/04/2026

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	08/04/2026		S		120,000	D	$1.5394(1)	2,380,000	D
Class A Common Stock	08/05/2026		S		140,000	D	$1.5104(2)	2,240,000	D
Class A Common Stock	08/06/2026		S		89,255	D	$1.5062(3)	2,150,745	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 $1.55. 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 $1.55. 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	08/06/2026
	** 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)