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    New insider Ecor1 Capital, Llc claimed ownership of 5,730,000 shares (SEC Form 3)

    5/13/25 7:09:14 PM ET
    $ITOS
    Biotechnology: Biological Products (No Diagnostic Substances)
    Health Care
    Get the next $ITOS alert in real time by email
    SEC FORM 3 SEC Form 3
    FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549

    INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
    or Section 30(h) of the Investment Company Act of 1940
    OMB APPROVAL
    OMB Number: 3235-0104
    Estimated average burden
    hours per response: 0.5
    1. Name and Address of Reporting Person*
    EcoR1 Capital, LLC

    (Last) (First) (Middle)
    357 TEHAMA STREET #3

    (Street)
    SAN FRANCISCO CA 94103

    (City) (State) (Zip)
    2. Date of Event Requiring Statement (Month/Day/Year)
    05/13/2025
    3. Issuer Name and Ticker or Trading Symbol
    iTeos Therapeutics, Inc. [ ITOS ]
    4. Relationship of Reporting Person(s) to Issuer
    (Check all applicable)
    Director X 10% Owner
    Officer (give title below) Other (specify below)
    5. If Amendment, Date of Original Filed (Month/Day/Year)
    6. Individual or Joint/Group Filing (Check Applicable Line)
    X Form filed by One Reporting Person
    Form filed by More than One Reporting Person
    Table I - Non-Derivative Securities Beneficially Owned
    1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
    Common Stock 5,730,000(2) I See Note(1)
    Table II - Derivative Securities Beneficially Owned
    (e.g., puts, calls, warrants, options, convertible securities)
    1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
    Date Exercisable Expiration Date Title Amount or Number of Shares
    Explanation of Responses:
    1. The reporting persons are EcoR1 Capital, LLC ("EcoR1"), EcoR1 Capital Fund Qualified L.P. ("Qualified Fund") and Oleg Nodelman. EcoR1 is the general partner and investment adviser of private funds, including Qualified Fund (the "Funds"). Mr. Nodelman is the manager and controlling owner of EcoR1. EcoR1 is filing this Form 3 for itself Mr. Nodelman and Qualified Fund. The reporting persons are filng this Form 3 jointly, but not as a group, and each expressly disclaims membership in a group within the meaning of Rule 3d-5(b) under the Securities Exchange Act of 1934. The Funds hold these securities directly for the benefit of their investors. EcoR1 may be deemed to indirectly beneficially own them as the investment adviser to the Funds. Mr. Nodelman may be deemed to indirectly beneficially own them as the control person of EcoR1. The reporting persons disclaim beneficial ownership of such securities except to the extent of their respective pecuniary interests therein.
    2. Qualified Fund beneficially owns 5,371,661 shares of Common Stock.
    /s/ Oleg Nodelman, Manager of EcoR1 Capital, LLC 05/13/2025
    ** Signature of Reporting Person Date
    Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
    * If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
    ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
    Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
    Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
    Get the next $ITOS alert in real time by email

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