Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 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 that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN 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

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1. Name and Address of Reporting Person * GOTTWALD THOMAS E 2. Issuer Name and Ticker or Trading Symbol NEWMARKET CORP [NEU] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Chairman, President & CEO (Last) (First) (Middle) 330 SOUTH FOURTH STREET 3. Date of Earliest Transaction (Month/Day/Year) 08/25/2025 (Street) RICHMOND, VA 23219 4. If Amendment, Date 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 (City) (State) (Zip) 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) Code V Amount (A) or (D) Price Common Stock 08/25/2025 G 315 D $ 0 20,612 D Common Stock 2,316 I Shares held as trustee for grandchild (trust 1) Common Stock 1,868 I Shares held as trustee for grandchild (trust 2) Common Stock 1,680 I Shares held as trustee for grandchild (trust 3) Common Stock 1,558 I Shares held as trustee for grandchild (trust 4) Common Stock 1,286 I Shares held as trustee for grandchild (trust 5) Common Stock 955 I Shares held as trustee for grandchild (trust 6) Common Stock 984 I Shares held as trustee for grandchild (trust 7) Common Stock 576 I Shares held as trustee for grandchild (trust 8) Common Stock 438 I Shares held as trustee for grandchild (trust 9) Common Stock 402 I Shares held as trustee for grandchild (trust 10) Common Stock 132 I Shares held as trustee for grandchild (trust 11) Common Stock 198 I Shares held as trustee for grandchild (trust 12) Common Stock 132 I Shares held as trustee for grandchild (trust 13) Common Stock 39,593.43(1) I NewMarket Savings Plan Common Stock 5,087 I Shares held by reporting person's wife Common Stock 46,407 I Shares held as co-trustee fbo (among others reporting Floyd D. Gottwald) Common Stock 6,889 I Shares held as co-trustee fbo children dtd. 12/16/1991 Common Stock 63,607 I 2022 GRAT Common Stock 225,000 I 2025 GRAT

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 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
GOTTWALD THOMAS E 330 SOUTH FOURTH STREET RICHMOND, VA 23219	X		Chairman, President & CEO

Signatures

/s/ Anne-Marie Anderson (by Power of Attorney for Thomas E. Gottwald)		09/03/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	The increase in shares is due to periodic purchases by the Plan Trustee pursuant to the Plan.

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