X0306 4/A 2019-03-12 2019-03-14 0 0001054905 INNOSPEC INC. IOSP 0001338883 Williams Patrick 8310 SOUTH VALLEY HIGHWAY SUITE 350 ENGLEWOOD CO CO80112 0 1 0 0 PRESIDENT & CEO Common Stock 2019-03-12 4 S 0 6813 84.1312 D 188654 D Common Stock 2019-03-12 4 S 0 217 84.9449 D 188437 D The amount of shares sold formed part of a single order placed with the broker for the sale of 35,000 shares. 28,187 shares are still to be sold. The shares of Common Stock sold by the Reporting Person and reported herein were sold at a range of between $83.69 and $84.53 per share. The sale price reported above represents the weighted average sale price for the reported transaction and has been rounded to the nearest cent.The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such price range. The amount of shares sold formed part of a single order placed with the broker for the sale of 35,000 shares. 27,970 shares are still to be sold. The shares of Common Stock sold by the Reporting Person and reported herein were sold at a range of between $84.88 and $85.15 per share. The sale price reported above represents the weighted average sale price for the reported transaction and has been rounded to the nearest cent.The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within such price range. Patrick S Williams 2019-03-15