NPEH, LLC sells 435,000 NET Power shares

NPEH, LLC, a 10% owner of NET Power Inc., reported open-market sales of Class A Common Stock.

Rhea-AI Filing Summary

NPEH, LLC, a 10% owner of NET Power Inc., reported open-market sales of Class A Common Stock. It sold 400,000 shares on May 12, 2026 at a weighted average price of $2.4389 per share and 35,000 shares on May 13, 2026 at a weighted average price of $2.4329 per share. After these transactions, NPEH, LLC holds 2,965,000 Class A shares directly.

Insider Trade Summary

Net Seller: 435,000 shares

Net Sell 2 txns

Insider NPEH, LLC

Role 10% Owner

Sold 435,000 shs ($1.06M)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	35,000	$2.4329	$85K
Sale	Class A Common Stock	400,000	$2.4389	$976K

Holdings After Transaction: Class A Common Stock — 2,965,000 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 $2.35 to $2.51. 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 $2.405 to $2.46. 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.

Key Figures

Total shares sold: 435,000 shares Shares sold on May 12, 2026: 400,000 shares Weighted avg price May 12, 2026: $2.4389/share +3 more

6 metrics

Total shares sold 435,000 shares Net open-market sales reported in this Form 4

Shares sold on May 12, 2026 400,000 shares Class A Common Stock, open-market sale

Weighted avg price May 12, 2026 $2.4389/share Open-market sale weighted average price

Shares sold on May 13, 2026 35,000 shares Class A Common Stock, open-market sale

Weighted avg price May 13, 2026 $2.4329/share Open-market sale weighted average price

Shares held after transactions 2,965,000 shares Direct ownership of Class A Common Stock following sales

Key Terms

Class A Common Stock, open-market sale, weighted average sales price, 10% owner

4 terms

Class A Common Stock financial

"It sold 400,000 shares on May 12, 2026 at a weighted average price of $2.4389 per share"

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.

open-market sale financial

"reported open-market sales of Class A Common Stock"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

weighted average sales price financial

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

10% owner financial

"NPEH, LLC, a 10% owner of NET Power Inc., reported open-market sales"

FAQ

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

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

NPEH, LLC reported selling a total of 435,000 NET Power Inc. Class A shares in open-market transactions on May 12 and May 13, 2026. These were routine sales of existing holdings, not option exercises or derivative conversions disclosed in this filing.

How many NET Power (NPWR) shares does NPEH, LLC still own after these sales?

After the reported sales, NPEH, LLC directly holds 2,965,000 shares of NET Power Class A Common Stock. This post-transaction balance reflects the remaining position disclosed in the Form 4 and shows that the entity continues to be a significant shareholder.

At what prices did NPEH, LLC sell its NET Power (NPWR) shares?

NPEH, LLC reported weighted average sale prices of $2.4389 per share on May 12, 2026 and $2.4329 per share on May 13, 2026. Footnotes state individual trades occurred within narrow ranges around these averages during each trading day.

Were NPEH, LLC’s NET Power (NPWR) transactions open-market sales or private transfers?

The filing describes both transactions as open-market sales of non-derivative Class A Common Stock. This means the shares were sold on the market (or in similar transactions), rather than being gifts, tax withholdings, restructurings, or exercises of options or other derivatives.

Does NPEH, LLC hold any NET Power (NPWR) derivative securities in this Form 4?

The Form 4 derivative summary is empty, indicating no derivative securities, such as options or warrants, are reported in this filing. The reported activity covers only non-derivative Class A Common Stock transactions and the resulting direct share ownership position.

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

The footnotes explain that reported prices are weighted averages across multiple trades in each day’s sale range. NPEH, LLC notes it can provide the exact number of shares sold at each individual price level to regulators, the issuer, or security holders on request.

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

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Accepted by SEC EDGAR 05/14/2026 - 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)
05/12/2026

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	05/12/2026		S		400,000	D	$2.4389(1)	3,000,000	D
Class A Common Stock	05/13/2026		S		35,000	D	$2.4329(2)	2,965,000	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 $2.35 to $2.51. 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 $2.405 to $2.46. 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.

	By: /s/ Min Lee, General Counsel of 8 Rivers Capital, LLC, its Manager	05/14/2026
	** 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)