ASP Isotopes holder plans 50K-share stock sale

A proposed Rule 144 sale by J.P. Morgan for Donald George Ainscow would put 50,000 ASPI shares on the market for about $194,391.

Rhea-AI Filing Summary

ASP Isotopes Inc. (ASPI) has a notice of proposed sale under Rule 144 for common stock held for the account of Donald George Ainscow. J.P. Morgan Securities LLC, acting as agent and attorney-in-fact, plans to sell 50,000 shares of ASP Isotopes common stock. The proposed sale has an aggregate market value of $194,390.65, with ASP Isotopes reporting 125,903,447 shares outstanding as of September 2, 2026, which is a baseline figure, not the amount being sold. Ainscow previously acquired 400,000 shares on August 1, 2025 as a restricted stock award and sold 100,000 shares on June 30, 2026 for $614,000.

Key Figures

Shares proposed to be sold: 50,000 shares Aggregate market value of proposed sale: $194,390.65 Shares outstanding: 125,903,447 shares +3 more

6 metrics

Shares proposed to be sold 50,000 shares Common stock sale for account of Donald George Ainscow under Rule 144

Aggregate market value of proposed sale $194,390.65 Value of 50,000 ASP Isotopes shares covered by the Form 144 notice

Shares outstanding 125,903,447 shares ASP Isotopes common stock outstanding as of September 2, 2026

Shares acquired as Restricted Stock Award 400,000 shares Common stock acquired as compensation on August 1, 2025

Shares sold in past three months 100,000 shares Common stock sold on June 30, 2026 by Donald Ainscow

Proceeds from prior sale $614,000 Total consideration for 100,000 shares sold on June 30, 2026

Key Terms

Rule 144, Restricted Stock Award, affiliate, aggregate market value

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Award financial

"Acquired as compensation - Restricted Stock Award"

A restricted stock award is company shares given to an employee or executive that cannot be sold or fully owned until certain conditions—like staying with the company for a set time or hitting performance targets—are met. Think of it as a gift that only becomes yours after you fulfill specific obligations; for investors, these awards matter because they can increase the total shares outstanding when they vest, reveal how management is being paid and motivated, and create potential selling pressure when restrictions lift.

affiliate regulatory

"Affiliate 144: Securities Information"

aggregate market value financial

"Common Stock | J.P. Morgan Securities LLC ... | 50000 | 194390.65"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

What does the Form 144 filing disclose for ASP Isotopes Inc. (ASPI)?

The filing discloses that 50,000 shares of ASP Isotopes common stock held for Donald George Ainscow may be sold under Rule 144, with J.P. Morgan Securities LLC acting as agent and attorney-in-fact for the transaction.

How many ASP Isotopes (ASPI) shares is Donald George Ainscow proposing to sell?

The notice covers a proposed sale of 50,000 shares of ASP Isotopes common stock for the account of Donald George Ainscow, with the transaction to be handled by J.P. Morgan Securities LLC.

What is the aggregate market value of the ASP Isotopes (ASPI) shares in this Form 144?

The proposed 50,000-share sale has an aggregate market value of $194,390.65, as stated in the Form 144. This reflects the value used for Rule 144 notice purposes for the contemplated sale.

How many ASP Isotopes (ASPI) shares were sold by Donald Ainscow in the past three months?

The filing reports that Donald Ainscow sold 100,000 shares of ASP Isotopes common stock on June 30, 2026 for total proceeds of $614,000 during the prior three-month period.

How many ASP Isotopes (ASPI) shares did Donald Ainscow acquire as compensation?

Donald Ainscow acquired 400,000 shares of ASP Isotopes common stock on August 1, 2025 as compensation through a Restricted Stock Award, according to the Form 144 disclosure.

What is the reported ASP Isotopes (ASPI) share count in the Form 144?

The Form 144 reports that ASP Isotopes had 125,903,447 shares outstanding as of September 2, 2026. This is provided as a context figure for the Rule 144 sale notice, not as the amount being sold.

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

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Available on EDGAR 09/02/2026 - 12:45 PM Accepted by SEC EDGAR 09/02/2026 - 12:44 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0002079961
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	ASP Isotopes, Inc.
SEC File Number	001-41555
Address of Issuer	2200 Ross Avenue Suite 4575E Dallas TEXAS 75201
Phone	214-432-8219
Name of Person for Whose Account the Securities are To Be Sold	Donald George Ainscow
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Affiliate

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common Stock	J.P. Morgan Securities LLC 270 Park Ave 10th Floor New York NY 10017	50000	194390.65	125903447	09/02/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common Stock	08/01/2025	Acquired as compensation - Restricted Stock Award	ASP Isotopes, Inc. (Issuer)			400000	08/01/2025	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Donald Ainscow 9029 Broken Arrow Lane Dallas TX 75209	Common Stock	06/30/2026	100000	614000

144: Remarks and Signature

Remarks
Date of Notice	09/02/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	J.P. Morgan Securities LLC, Workplace Solutions, as Agent and Attorney in Fact for Donald Ainscow, ASP Isotopes Inc.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)