Innospec(IOSP) - 2025 Q4 - Annual Report

Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 or ☐ 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 1-13879 INNOSPEC INC. (Exact name of registrant as specified in its charter) DELAWARE 98-0181725 State or other jurisdiction of incorporation or organization (I.R.S. Employer Identification No.) 83 ...