X0306 4 2020-03-12 0 0000911177 CASELLA WASTE SYSTEMS INC CWST 0001392991 Johnson Edwin D 25 GREENS HILL LANE C/O CASELLA WASTE SYSTEMS, INC. RUTLAND VT 05701 0 1 0 0 President & COO Class A Common Stock 2020-03-12 4 A 0 4029 0 A 374365 D Class A Common Stock 2020-03-13 4 S 0 2132 42.7722 D 372233 D Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal installments beginning on March 12, 2021. Represents the automatic sale of shares of stock for tax withholding purposes pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 3, 2019, in connection with the vesting of RSUs on March 12, 2020. Represents the weighted average sales price for shares sold in multiple transactions, ranging from $42.25 to $43.31. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price. /s/ Edwin D. Johnson 2020-03-16