Exhibit 99.1 PRESS RELEASE INNOSPEC REPORTS THIRD QUARTER 2024 FINANCIAL RESULTS Performance Chemicals and Fuel Specialties operating income up double digits with margin expansion As expected, Oilfield Services results remain impacted by lower production chemical activity $73.5 million cash generated from operations; Net cash improves to $303.8 million GAAP EPS $1.33 and adjusted non-GAAP EPS $1.35 Dividend for full year increased by 10 percent Englewood, CO – November 5, 2024 – Innospec Inc. (NASDAQ: IOSP) ...