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Form 8-K

sec.gov

8-K — NET Power Inc.

Accession: 0001845437-26-000023

Filed: 2026-06-05

Period: 2026-06-03

CIK: 0001845437

SIC: 3620 (ELECTRICAL INDUSTRIAL APPARATUS)

Item: Submission of Matters to a Vote of Security Holders

Documents

8-K — npwr-20260603.htm (Primary)

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8-K

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of report (Date of earliest event reported): June 3, 2026

NET POWER INC.

(Exact name of registrant as specified in its charter)

Delaware

001-40503 98-1580612

(State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.)

320 Roney St., Suite 200

Durham, North Carolina

27701

(Address of principal executive offices) (Zip Code)

(919) 287-4750

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Class A Common Stock, par value $0.0001 per share NPWR The New York Stock Exchange

Warrants, each exercisable for one share of Class A Common Stock at a price of $11.50

NPWR WS The New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Item 5.07 Submission of Matters to a Vote of Security Holders.

NET Power Inc. (the “Company”) held its annual meeting of stockholders on June 3, 2026. For more information on the following proposals submitted to stockholders, see the Company’s definitive proxy statement dated April 23, 2026. Below are the final voting results.

Proposal No. 1 - Election of Directors

The following three individuals were elected to the Company’s Board of Directors to serve as Class III directors until the Company’s 2029 annual meeting of stockholders and until their successors have been duly elected and qualified.

Name Votes For Votes Withheld Broker Non-Votes

Joseph Kelliher 169,556,764 4,166,153 17,096,817

Brad Pollack 173,335,018 387,899 17,096,817

Daniel J. Rice IV 173,561,348 161,569 17,096,817

Proposal No. 2 - Ratification of Independent Registered Public Accounting Firm

The appointment of KPMG LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026 was ratified.

Votes For Votes Against Votes Abstained

190,733,676 53,520 32,538

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: June 5, 2026 NET POWER INC.

By: /s/ Daniel J. Rice IV

Name: Daniel J. Rice IV

Title: Chief Executive Officer

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Document Period End Date

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Entity Registrant Name

NET POWER INC.

Entity Incorporation, State or Country Code

DE

Entity File Number

001-40503

Entity Tax Identification Number

98-1580612

Entity Address, Postal Zip Code

27701

City Area Code

(919)

Local Phone Number

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Trading Symbol

NPWR

Security Exchange Name

NYSE

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Entity Address, Address Line One

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