FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2026 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO Commission file number 001-13795 AMERICAN VANGUARD CORPORATION (State or other jurisdiction of Incorporation or organization) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware 95-2588080 (I.R.S. Employer Identi ...