ASP Isotopes (NASDAQ: ASPI) shares Sept. 2, 2025 shareholder letter

Rhea-AI Filing Summary

ASP Isotopes Inc. filed a current report to disclose that it issued a letter to shareholders dated September 2, 2025. The company is furnishing this shareholder letter as Exhibit 99.1 under a Regulation FD disclosure item, meaning it is intended to provide broadly available information to the market. The filing specifies that the information in Item 7.01 and Exhibit 99.1 is being furnished, not filed, so it is not subject to certain Exchange Act liabilities and will only be incorporated into other SEC documents if specifically referenced.

8-K Event Classification

2 items: 7.01, 9.01

2 items

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

Understanding 8-K Material Events →

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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): September 2, 2025

ASP Isotopes Inc.

(Exact name of registrant as specified in its charter)

Delaware		001-41555		87-2618235
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

601 Pennsylvania Avenue NW, South Building, Suite 900 Washington, DC		20004
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (202) 756-2245

 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:

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 September 2, 2025, ASP Isotopes Inc. (the “Company”) issued a letter to shareholders. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by reference.

The information in this Item 7.01, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01. Financial Statements and Exhibits.

Exhibit No.		Description
99.1		ASP Isotopes Inc. Letter to Shareholders, dated September 2, 2025.
104		Cover Page Interactive Date File (embedded within the Inline XBRL document)

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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.

	ASP ISOTOPES INC.
Date: September 2, 2025	By:	/s/ Donald G. Ainscow
	Name:	Donald G. Ainscow
	Title:	Executive Vice President, General Counsel and Secretary

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FAQ

What did ASP Isotopes Inc. (ASPI) report in this Form 8-K?

ASP Isotopes Inc. reported that it issued a shareholder letter dated September 2, 2025 and furnished it as Exhibit 99.1 under a Regulation FD disclosure item.

What is Exhibit 99.1 in ASP Isotopes Inc. (ASPI)'s Form 8-K?

Exhibit 99.1 is the ASP Isotopes Inc. letter to shareholders dated September 2, 2025, which is incorporated by reference into the Form 8-K as a furnished exhibit.

Is the ASP Isotopes Inc. (ASPI) shareholder letter considered 'filed' with the SEC?

No. The company states that the information in Item 7.01 and Exhibit 99.1 is being furnished, not filed, and is not subject to Section 18 of the Exchange Act.

Does this ASP Isotopes Inc. (ASPI) Form 8-K include financial statements?

Under Item 9.01, the Form 8-K lists only Exhibit 99.1, the shareholder letter, and Exhibit 104, the cover page interactive data file; no separate financial statements are listed.

Which Nasdaq-listed security of ASP Isotopes Inc. (ASPI) is referenced in the filing?

The filing lists ASP Isotopes Inc.'s common stock, par value $0.01 per share, traded on The Nasdaq Stock Market LLC under the symbol ASPI.

Who signed the ASP Isotopes Inc. (ASPI) Form 8-K related to the shareholder letter?

The Form 8-K was signed on behalf of ASP Isotopes Inc. by Donald G. Ainscow, Executive Vice President, General Counsel and Secretary.