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    Director Posner Brian S was granted 2,071 shares, increasing direct ownership by 2% to 122,175 units (SEC Form 4)

    5/7/26 4:50:06 PM ET
    $ACGL
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    Get the next $ACGL alert in real time by email
    SEC FORM 4SEC Form 4
    FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549

    STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

    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:3235-0287
    Estimated average burden
    hours per response:0.5
      
    Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
      
    Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
    1. Name and Address of Reporting Person*
    Posner Brian S

    (Last)(First)(Middle)
    WATERLOO HOUSE, GROUND FLOOR
    100 PITTS BAY ROAD

    (Street)
    PEMBROKEHM 08

    (City)(State)(Zip)

    BERMUDA

    (Country)
    2. Issuer Name and Ticker or Trading Symbol
    ARCH CAPITAL GROUP LTD. [ ACGL ]
    5. Relationship of Reporting Person(s) to Issuer
    (Check all applicable)
    XDirector10% Owner
    Officer (give title below)Other (specify below)
    2a. Foreign Trading Symbol
    3. Date of Earliest Transaction (Month/Day/Year)
    05/05/2026
    6. Individual or Joint/Group Filing (Check Applicable Line)
    XForm filed by One Reporting Person
    Form filed by More than One Reporting Person
    4. If Amendment, Date of Original Filed (Month/Day/Year)

    Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
    1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
    CodeVAmount(A) or (D)Price
    Common Shares, $.0011 par value per share05/05/2026A2,071A(1)122,175D
    Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
    (e.g., puts, calls, warrants, options, convertible securities)
    1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
    CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
    Explanation of Responses:
    1. Subject to the terms of the restricted share agreement, represents restricted shares that will become vested on the date that is the earlier of 1) one year following the grant date or 2) Arch Capital Group Ltd.'s next Annual General Meeting of Shareholders.
    Remarks:
    /s/ Brian S. Posner05/07/2026
    ** Signature of Reporting PersonDate
    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 4 (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.
    * Form 4: SEC 1474 (03-26)
    Get the next $ACGL alert in real time by email

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