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    SEC Form 144 filed by ASP Isotopes Inc.

    8/29/25 6:46:28 PM ET
    $ASPI
    Major Chemicals
    Industrials
    Get the next $ASPI alert in real time by email
    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
    0001888265
    Filer CCC
    XXXXXXXX
    Is this a LIVE or TEST Filing? Radio button checked LIVE Radio button not checked 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
    601 PENNSYLVANIA AVENUE NW
    SOUTH BUILDING, SUITE 900
    WASHINGTON
    DISTRICT OF COLUMBIA
    20004
    Phone
    202-756-2245
    Name of Person for Whose Account the Securities are To Be Sold
    Moore Duncan
    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
    Director

    144: Securities Information

    Title of the Class of Securities To Be SoldName and Address of the BrokerNumber of Shares or Other Units To Be SoldAggregate Market ValueNumber of Shares or Other Units OutstandingApproximate Date of SaleName the Securities Exchange
    Common Stock
    Independent Trading Group (ITG) Inc.
    33 Yonge Street, Suite 420
    Toronto � A6 � M5E 1G4
    75000789750.009191310908/29/2025
    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 ClassDate you AcquiredNature of Acquisition TransactionName of Person from Whom AcquiredIs this a Gift?Date Donor AcquiredAmount of Securities AcquiredDate of PaymentNature of Payment *
    Common Stock08/16/2023Acquired as compensation -- Restricted Stock AwardIssuerCheckbox not checked20000008/16/2023Equity 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

    Nothing to ReportCheckbox checked

    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 vesting of a previously granted restricted stock award for 200,000 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 $10.53 on August 28, 2025.
    Date of Notice
    08/29/2025

    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/ Duncan Moore

    ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

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