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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Name of Issuer)

(Title of Class of Securities)

(CUSIP Number)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13D/A 0000919561 XXXXXXXX LIVE 9 COMMON STOCK 12/09/2025 false 0001282637 651587107 NEWMARKET CORPORATION 330 SOUTH FOURTH STREET RICHMOND VA 23219 BRUCE C. GOTTWALD 804-788-5000 330 SOUTH FOURTH STREET RICHMOND VA 23219 0000919561 N BRUCE C. GOTTWALD b N X1 910741 37988 910741 37988 948729 Y 10.1 IN COMMON STOCK NEWMARKET CORPORATION 330 SOUTH FOURTH STREET RICHMOND VA 23219 Explanatory Note: This Amendment No.9 amends and supplements the statement on Schedule 13D initially filed with the Securities and Exchange Commission (the "SEC") on February 14, 2006 by Bruce C. Gottwald (the "Reporting Person"), as previously amended by Amendment No. 1 thereto filed with the SEC on August 18, 2006, by Amendment No. 2 thereto filed with the SEC on February 16, 2007, by Amendment No. 3 thereto filed with the SEC on May 27, 2008, by Amendment No. 4 thereto filed with the SEC on August 27, 2008, by Amendment No. 5 thereto filed with the SEC on July 8, 2010, by Amendment No. 6 filed with the SEC on July 15, 2014, by Amendment No. 7 filed with the SEC on October 29, 2021 and by Amendment No. 8 filed with the SEC on November 27, 2024, with respect to shares of common stock, without par value (the "Common Stock"), of NewMarket Corporation (the "Issuer"). Item 2(c) is hereby amended and restated as follows: Mr. Gottwald is retired. Prior to his retirement, Mr. Gottwald served as a director of the Issuer. Item 4 is hereby amended and restated as follows: The Reporting Person intends to hold for investment the shares of Common Stock that he beneficially owns and, aside from routine estate planning and family gift transactions, has no present plans to acquire or dispose of, or to cause any other person to acquire or dispose of, shares of Common Stock. The Reporting Person does, however, reserve the right to buy or sell shares of Common Stock from time to time. Except as indicated above, the Reporting Person has no present plans or proposals which relate to, or would result in, any one or more of the matters described in subparagraphs (a) through (j) of Item 4 to Schedule 13D. Item 5(a) is hereby amended and restated as follows: As of December 9, 2025, the Reporting Person beneficially owns 948,729 shares of Common Stock, which represents approximately 10.1% of the outstanding shares of Common Stock. This percentage calculation is based on a total number of outstanding shares of Common Stock of 9,397,122 as of November 30, 2025, which number was provided to the Reporting Person by the Issuer. The number of shares reported as beneficially owned above does not include an aggregate of 944,454 (10.1%) shares of Common Stock beneficially owned by the adult sons of the Reporting Person or an aggregate of 272,835 (2.9%) shares of Common Stock beneficially owned by three separate trusts of which each of the adult sons of the Reporting Person and his wife are co-trustees. The Reporting Person and his adult sons have no agreement with respect to the acquisition, retention, disposition or voting of shares of Common Stock. Item 5(b) is hereby amended and restated as follows: The Reporting Person has sole voting and dispositive power with respect to 910,741 of the shares of Common Stock described in Item 5(a) above. The Reporting Person has shared voting and dispositive power with respect to 37,988 of the shares of Common Stock described in Item 5(a) above, which includes 18,731 shares of Common Stock held by the Reporting Person's wife and 19,257 shares held by a charitable foundation for which the Reporting Person serves as a director. The Reporting Person disclaims beneficial ownership of the shares held by his wife and the charitable foundation. Item 5(c) is hereby amended and restated as follows: The Reporting Person has not engaged in any transactions in the Common Stock in the past 60 days. Item 5(d) is hereby amended and restated as follows: Other persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, all 37,988 shares for which the Reporting Person shares voting and dispositive power as reported under Item 5(b) above. None of these persons, however, have any such interest that relates to more than 5% of the outstanding Common Stock. BRUCE C. GOTTWALD /S/ BRUCE C. GOTTWALD BRUCE C. GOTTWALD 01/07/2026