X0306 4 2021-10-29 0 0001745041 IAA, Inc. IAA 0001669069 Carlson Christopher TWO WESTBROOK CORPORATE CENTER, SUITE 500 WESTCHESTER IL 60154 0 1 0 0 VP and Corporate Controller Common Stock 2021-10-29 4 F 0 47 59.65 D 3240.277 D Represents shares of common stock withheld by the Issuer to pay tax withholding obligations of the Reporting Person upon the vesting of restricted stock units previously granted to the Reporting Person. Includes 32.5530 shares of the Issuer's common stock that were purchased by the Reporting Person under the Issuer's employee stock purchase plan since the last filing of a Form 4 by the Reporting Person. Christopher Carlson, /s/ Sidney Peryar as attorney-in-fact 2021-11-01