ASP Isotopes officer plans 25K, 8,438 sales

An officer of ASP Isotopes Inc. filed a Rule 144 notice to sell shares, partly to cover tax liabilities from a 300,000-share restricted stock award.

Rhea-AI Filing Summary

ASP Isotopes Inc. (ASPI) reports that officer Robert Ainscow has filed a notice under Rule 144 to sell common stock through Independent Trading Group. The notice covers planned sales of 25,000 and 8,438 shares on NASDAQ, with an aggregate market value based on a $3.78 closing price on September 1, 2026. The shares relate to a previously granted 300,000-share restricted stock award under an issuer equity incentive plan, and the filing states that part of the sale is to satisfy income tax liabilities from quarterly vesting.

Key Figures

Planned sale 1: 25,000 shares Planned sale 1 value: $94,500.00 Planned sale 2: 8,438 shares +5 more

8 metrics

Planned sale 1 25,000 shares Common stock to be sold through Independent Trading Group on NASDAQ

Planned sale 1 value $94,500.00 Aggregate market value for 25,000 shares listed in the notice

Planned sale 2 8,438 shares Additional common stock block to be sold through Independent Trading Group

Planned sale 2 value $31,895.64 Aggregate market value for 8,438 shares listed in the notice

Restricted stock award size 300,000 shares Previously granted restricted stock award under issuer equity incentive plan

Reference price $3.78 per share Closing market price on September 1, 2026 used to compute aggregate value

Shares outstanding 153,309,380 shares Common shares outstanding referenced in Rule 144 calculations

Recent sale proceeds $59,057.56 Proceeds from sale of 8,438 shares on June 8, 2026 in past three months

Key Terms

Rule 144, restricted stock award, equity incentive plan, Aggregate Market Value, +1 more

5 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

"quarterly vesting of a previously granted restricted stock award for 300,000 shares"

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.

equity incentive plan financial

"300,000 shares pursuant to an issuer equity incentive plan."

An equity incentive plan is a program that gives employees, executives or directors the right to receive company stock or options to buy stock as part of their pay. Think of it as offering slices of future company profit to motivate people to boost long‑term performance; for investors it matters because it can align employee goals with shareholder value but also increases the number of shares outstanding, which can dilute existing ownership.

Aggregate Market Value financial

"The Aggregate Market Value of the shares to be sold is based on"

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.

quarterly vesting financial

"resulting from the quarterly vesting of a previously granted restricted stock award"

FAQ

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

What does ASP Isotopes Inc. (ASPI) disclose in this Form 144?

ASP Isotopes Inc. discloses that officer Robert Ainscow filed a Rule 144 notice to sell common stock, tied to a 300,000-share restricted stock award granted as equity compensation under the company’s equity incentive plan.

How many ASPI shares are proposed to be sold under this Rule 144 filing?

The filing lists planned sales of 25,000 and 8,438 ASP Isotopes Inc. common shares on NASDAQ. The underlying restricted stock award comprises 300,000 shares, which vest quarterly under an issuer equity incentive plan.

What is the estimated market value of the ASPI shares to be sold?

The aggregate market value of ASP Isotopes Inc. shares to be sold is calculated using a $3.78 closing market price on September 1, 2026. One block is valued at $94,500.00 and another at $31,895.64, based on the disclosed share counts.

Why is officer Robert Ainscow selling ASPI shares according to the filing?

The filing states that the sale of shares includes an amount to satisfy income tax liabilities arising from the quarterly vesting of a previously granted 300,000-share restricted stock award under ASP Isotopes Inc.’s equity incentive plan.

How many ASP Isotopes Inc. shares are outstanding as referenced in this filing?

The Form 144 references 153,309,380 ASP Isotopes Inc. common shares as the number of shares outstanding, used in connection with the calculation of the amount of securities that may be sold under Rule 144.

Has Robert Ainscow sold ASPI shares in the past three months?

Yes. The filing reports that 8,438 ASP Isotopes Inc. common shares were sold on June 8, 2026 for total proceeds of $59,057.56, and this transaction is disclosed under securities sold during the past three months.

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

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Available on EDGAR 09/02/2026 - 09:30 PM EDT Accepted by SEC EDGAR 09/02/2026 - 09:30 PM EDT 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	0001951275
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	2144328219
Name of Person for Whose Account the Securities are To Be Sold	Ainscow Robert
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	OFFICER

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	Independent Trading Group (ITG) Inc. 33 Yonge Street Suite 420 Toronto A6 M5E 1G4	25000	94500.00	153309380	09/02/2026	NASDAQ
Common Stock	Independent Trading Group (ITG) Inc. 33 Yonge Street Suite 420 Toronto A6 M5E 1G4	8438	31895.64	153309380	09/08/2026	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	09/06/2024	Acquired as compensation --Restricted Stock Award	Issuer			300000	09/06/2024	Equity Compensation

* 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
Ainscow Robert c/o ASP Isotopes Inc. 2200 Ross Avenue, Suite 4575E Dallas TX 75201	Common Stock	06/08/2026	8438	59057.56

144: Remarks and Signature

Remarks	The sale of shares reported in this Form 144 includes an amount for the purpose of satisfying the Reporting Person's income tax liabilities resulting from the quarterly vesting of a previously granted restricted stock award for 300,000 shares pursuant to an issuer equity incentive plan. The Aggregate Market Value of the shares to be sold is based on the closing market price of $3.78 on September 1, 2026.
Date of Notice	09/02/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/09/2025
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	/s/ Robert Ainscow
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)