X0508 4 2026-02-23 false 0001054905 INNOSPEC INC. IOSP 0001233480 MCROBBIE IAN MALCOLM 8310 SOUTH VALLEY HIGHWAY SUITE 350 ENGLEWOOD CO 80112 false true false false Senior VP R&T false Phantom Stock 2026-02-23 4 A false 2228 0 A 2029-02-23 2029-02-23 Common Stock 2228 2228 D Each share of phantom stock is the economic equivalent of one share of Innospec common stock. The award is scheduled to automatically settle in cash on the Expiration Date based on the closing price of Innospec common stock on that date. Ian Malcolm McRobbie 2026-02-25