X0306 4 2018-02-05 0 0000861878 STERICYCLE INC SRCL 0001697373 Abdulmassih Ruth-Ellen 28161 N. KEITH DRIVE LAKE FOREST IL 60045 0 1 0 0 Executive Vice President Common Stock 2018-02-05 4 M 0 140 A 1467 D Common Stock 2018-02-05 4 F 0 58 70.72 D 1409 D Common Stock 79 I by Daughter Restricted Stock Units 0.0 2018-02-05 4 M 0 140 D 2021-02-05 Common Stock 140 562 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. 58 shares were withheld by the Issuer to satisfy the minimum statutory tax withholding requirements on vesting of RSUs. This award was granted on February 5, 2016 for 702 shares. 140 shares vested on February 5, 2018 and the remaining unvested RSUs will continue to vest in equal annual installments on the next 3 anniversaries of the grant date. All unvested RSUs are subject to continued employment through the applicable vesting date. /s/ Ruth E. Abdulmassih 2018-02-06