X0306 4 2018-02-16 0 0000861878 STERICYCLE INC SRCL 0001605708 Arnold Brent 28161 N. KEITH DRIVE LAKE FOREST IL 60045 0 1 0 0 EVP & Chief Operating Officer Common Stock 2018-02-16 4 M 0 999 A 4254 D Common Stock 2018-02-16 4 F 0 346 76.02 D 3908 D Common Stock 15 I by Son Restricted Stock Units 0.0 2018-02-16 4 M 0 999 D Common Stock 999 3999 D Each restricted stock unit (RSU) represents the right to receive, at settlement, one share of common stock. This transaction represents the settlement of RSUs in shares of common stock on their scheduled vesting date. No shares were sold. 346 shares were withheld by the Issuer to satisfy the minimum statutory tax withholding requirements on vesting of RSUs. This award was granted on February 16, 2017 for 4,998 shares. 999 shares vested on February 16, 2018 and the remaining unvested RSUs will continue to vest in equal annual installments on the next 4 anniversaries of the grant date. All unvested RSUs are subject to continued employment through the applicable vesting date. /s/ Joseph Arnold 2018-02-20