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    SEC Form 144 filed by Disc Medicine Inc.

    10/15/25 5:00:20 PM ET
    $IRON
    Biotechnology: Pharmaceutical Preparations
    Health Care
    Get the next $IRON 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
    0001628098
    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
    Disc Medicine, Inc.
    SEC File Number
    001-39438
    Address of Issuer
    321 ARSENAL STREET
    SUITE 101
    WATERTOWN
    MASSACHUSETTS
    02472
    Phone
    617-674-9274
    Name of Person for Whose Account the Securities are To Be Sold
    Atlas Venture Fund X, LP
    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
    Shareholder

    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
    Merrill Lynch
    One Bryant Park
    New York � NY � 10036
    2216016176803476558110/15/2025
    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 Stock05/01/2020Private PlacementIssuerCheckbox not checked2216005/01/2020Cash

    * 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 SellerTitle of Securities SoldDate of SaleAmount of Securities SoldGross Proceeds
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock07/18/202566440588.79
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock07/23/2025298371819239.47
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock07/24/202513033797188.21
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock07/30/20258492518329.6
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock08/05/202539524075.25
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock08/13/2025249621526501.19
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock08/14/20257212439848.34
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock08/22/20252287139584.07
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock10/07/2025180391233536.76
    Atlas Venture Opportunity Fund I, LP.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock10/08/2025719615078963.7
    Atlas Venture Fund X, L.P.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock07/18/2025118472375.2
    Atlas Venture Fund X, L.P.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock07/23/2025532153244656.91
    Atlas Venture Fund X, L.P.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock07/24/2025232451421824.59
    Atlas Venture Fund X, L.P.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock07/30/202515146924472.46
    Atlas Venture Fund X, L.P.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock08/05/202570542969.75
    Atlas Venture Fund X, L.P.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock08/13/2025445202722531.56
    Atlas Venture Fund X, L.P.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock08/14/202512862784432.8
    Atlas Venture Fund X, L.P.
    300 Technology Sq Ste 8
    Cambridge � MA � 02139
    Common Stock08/22/20254080249017.5

    144: Remarks and Signature

    Remarks
    Date of Notice
    10/15/2025

    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
    Ommer Chohan

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

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