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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

\n \n \n \n \n \n

Date of Report (Date of earliest event reported): October 26, 2026

ASP Isotopes Inc.

(Exact name of Registrant as Specified in Its Charter)

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n	\n	\n
Delaware	001-41555	87-2618235
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

2200 Ross Avenue Suite 4575E
Dallas, Texas		75201
(Address of Principal Executive Offices)		(Zip Code)

\n \n \n \n \n \n

Registrant’s Telephone Number, Including Area Code: (214) 432-8219

\n \n \n \n \n \n

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:

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

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

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

☐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:

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n	\n	\n
Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, par value $0.01		ASPI		The Nasdaq Stock Market LLC

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 ☒

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. ☐

Item 7.01 Regulation FD Disclosure.

On October 26, 2026, ASP Isotopes Inc. (the “Company”) issued a press release announcing that Tetra4 Proprietary Limited, a subsidiary of Renergen Limited, has completed commissioning and achieved stable production of liquid helium.

The information in this Item 7.01 and in the Press Release shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, and shall not be incorporated by reference into any filing with the U.S. Securities and Exchange Commission, whether made by the Company before or after the date hereof, regardless of any general incorporation language in such filing.

The Press Release includes “safe harbor” language pursuant to the Private Securities Litigation Reform Act of 1995, as amended, indicating that certain statements contained therein are “forward-looking” rather than historical.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n
Exhibit No.	Description
99.1	Press Release dated October 26, 2026.
104	Cover Page Interactive Date File (embedded within the Inline XBRL document)

SIGNATURES

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.

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

\n	\n	\n	\n
			ASP ISOTOPES INC.

Date:	October 26, 2026	By:	/s/ Donald G. Ainscow
		Name: Title:	Donald G. Ainscow Executive Vice President, General Counsel and Secretary

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