Sec Form 4 Filing - Murray Thomas J III @ HEIDRICK & STRUGGLES INTERNATIONAL INC - 2025-12-10

FORM 4 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 Murray Thomas J III 2. Issuer Name and Ticker or Trading Symbol HEIDRICK & STRUGGLES INTERNATIONAL INC [ HSII] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President (Last) (First) (Middle) C/O HEIDRICK & STRUGGLES INT'L, INC., 233 S. WACKER DR. SUITE 4900 3. Date of Earliest Transaction (MM/DD/YY) 12/10/2025 (Street) CHICAGO, IL60606 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ 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 12/10/2025 D 17,269 D $ 59 ( 1 ) 64,767 D Common Stock (Restricted Stock Unit) 12/10/2025 D 40,479 ( 2 ) D 24,288 D Common Stock (Performance Share Unit) 12/10/2025 D 24,288 ( 3 ) D 0 D Common Stock (Performance Share Unit) 12/10/2025 D 83,712 ( 4 ) D 0 D

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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Murray Thomas J III C/O HEIDRICK & STRUGGLES INT'L, INC. 233 S. WACKER DR. SUITE 4900 CHICAGO, IL60606 President Signatures /s/ Antony Gabriel, Attorney-In-Fact 12/10/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the Agreement and Plan of Merger, dated as of October 5, 2025 (the "Merger Agreement"), by and among the Company, Heron BidCo, LLC ("Parent"), and Heron Merger Sub, Inc., a direct wholly owned subsidiary of Parent ("Merger Sub"), on December 10, 2025, Merger Sub merged with and into the Company (the "Merger"), and each share of Company common stock ("Share") issued and outstanding immediately prior to the effective time of the Merger (the "Effective Time") was automatically canceled and converted into the right to receive $59.00 in cash, without interest (the "Merger Consideration"). ( 2 )Immediately prior to the Effective Time, each outstanding restricted stock unit award was canceled and converted, in accordance with the terms of the Merger Agreement, into the right to receive the Merger Consideration in cash, without interest, plus any accrued but unpaid dividends thereon. ( 3 )Immediately prior to the Effective Time, each outstanding performance share unit award subject to vesting conditions based upon the achievement of specified stock prices was canceled and converted, in accordance with the terms of the Merger Agreement, into the right to receive, for each Share underlying such award at 100% of target, the Merger Consideration in cash, without interest, plus any accrued but unpaid dividends thereon. ( 4 )Immediately prior to the Effective Time, each outstanding performance share unit award subject to vesting conditions based upon the achievement of business performance metrics, was canceled and converted, in accordance with the terms of the Merger Agreement, for each Share underlying such award at 200% of target, into the right to receive the Merger Consideration in cash, without interest, plus any accrued but unpaid dividends thereon.

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).

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