Sec Form 3 Filing - ACKMAN WILLIAM A @ PERSHING SQUARE INC. - 2026-04-29

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED 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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person ACKMAN WILLIAM A 2. Issuer Name and Ticker or Trading Symbol PERSHING SQUARE INC. [ PS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) CEO & Chairman (Last) (First) (Middle) C/O PERSHING SQUARE INC., 787, ELEVENTH AVENUE, 9TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 04/29/2026 (Street) NEW YORK, NY10019 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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) Code V Amount (A) or (D) Price Common Stock 83,700,000 I See footnote ( 1 ) Common Stock 16,000,000 I See footnote ( 2 ) Common Stock 300,000 I See footnote ( 3 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares M Units of Pershing Square Partner Group, LLC ( 4 ) ( 5 ) ( 4 )( 5 ) ( 4 )( 5 ) Common Stock 92,430,722 I See footnote ( 1 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other ACKMAN WILLIAM A C/O PERSHING SQUARE INC., 787 ELEVENTH AVENUE, 9TH FLOOR NEW YORK, NY10019 X X CEO & Chairman WAA Management LLC 787 11TH AVENUE FLOOR 9 NEW YORK, NY10019 X Signatures By: /s/ William A. Ackman 04/29/2026 Signature of Reporting Person Date By: WAA Management LLC, By: /s/ William A. Ackman, Manager 04/29/2026 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Reflects shares directly held by WAA Management LLC, of which the Reporting Person is the sole manager. ( 2 )Reflects shares directly held a grantor retained annuity trust, of which the Reporting Person is the trustee. ( 3 )Reflects shares directly held by a trust whose beneficiaries include the Reporting Person's family members. The Reporting Person may be deemed to be the beneficial owner of these shares for purposes of Rule 16a-1(a) under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). The Reporting Person disclaims beneficial ownership of these shares, except to the extent of any pecuniary interest therein. ( 4 )These M Units ("M Units") of Pershing Square Partner Group, LLC ("PSPG") were granted to the Reporting Person pursuant to an amendment of PSPG's governing document on a pro rata basis of the Reporting Person's prior interest in PSPG on April 28, 2026. These M Units are fully vested. The grant was approved by the board of directors of the Issuer in accordance with Rule 16b-3 under the Exchange Act. ( 5 )Upon vesting, each M Unit may be redeemed by the holder, subject to certain conditions, for shares of Issuer common stock held by PSPG on a one-for-one basis, subject to certain adjustments pursuant to the terms approved by the board of directors of the Issuer. These redemption rights do not expire.

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).

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