Sec Form 4 Filing - STEPAN F QUINN JR @ STEPAN CO - 2025-03-06

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 STEPAN F QUINN JR 2. Issuer Name and Ticker or Trading Symbol STEPAN CO [ SCL] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 1101 SKOKIE BOULEVARD, SUITE 500 3. Date of Earliest Transaction (MM/DD/YY) 03/06/2025 (Street) NORTHBROOK, IL60062 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 03/10/2025 G 339.292 A $ 0 102,945.738 D Common Stock 172,423 D ( 1 ) Common Stock 0.002 I By Esop II Trust Common Stock 160,000 I By Family LLC ( 2 ) Common Stock 87,500 I By Family Trust IV ( 2 ) Common Stock 100 I By Father ( 2 ) ( 3 ) Common Stock 1,017 I By Spouse Common Stock 67.214 I By Father's ESOP ( 2 ) ( 3 ) Common Stock 19,052 I By Family Trust V ( 2 ) Common Stock 161,869 I By Mother's Estate ( 2 ) ( 3 ) Common Stock 600 I By Family Trust VI ( 2 ) ( 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 Share Units ( 4 ) ( 5 ) ( 6 ) ( 6 ) Common Stock 63,404.923 63,404.923 D Share Units ( 4 ) ( 5 ) 03/06/2025 M 49,154.253 ( 6 ) ( 6 ) Common Stock 49,154.253 ( 7 ) 45,544.19 I By Father's Deferred MIP ( 3 ) Share Units ( 4 ) ( 5 ) 03/10/2025 M 2,375.041 ( 6 ) ( 6 ) Common Stock 2,375.041 ( 8 ) 43,169.149 I By Father's Deferred MIP ( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other STEPAN F QUINN JR 1101 SKOKIE BOULEVARD, SUITE 500 NORTHBROOK, IL60062 X Signatures /s/ Stephanie J. Pacitti, Attorney-in-Fact for F. Quinn Stepan, Jr. 03/10/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Joint Tenancy with Spouse. ( 2 )The reporting person disclaims beneficial ownership of these securities, except to extent of any pecuniary interest in the shares. ( 3 )Shares held by an estate of which the reporting person serves as executor. ( 4 )Share Units are acquired under the Management Incentive Plan ("MIP"), a nonqualified deferred compensation plan that allows participants to defer all or a portion of their annual incentive awards. ( 5 )Share Units convert on a one-for-one basis into Common Stock. ( 6 )Share Units are generally payable at end of employment, unless otherwise elected. ( 7 )Each share unit was the economic equivalent of one share of Stepan Company common stock. On March 6, 2025, 49,154.253 share units were settled in cash. ( 8 )Each share unit was the economic equivalent of one share of Stepan Company common stock. On March 10, 2025, 2,375.041 share units were settled for an equal number of shares of Stepan Company common stock and distributed to beneficiaries, including 339.292 shares distributed to the reporting person.

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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