X0306 4 2015-06-10 0 0000911177 CASELLA WASTE SYSTEMS INC CWST 0001055352 CASELLA JOHN W C/O CASELLA WASTE SYSTEMS 25 GREENS HILL LANE RUTLAND VT 05701 1 1 0 0 Chief Executive Officer Class A Common Stock 2015-06-10 4 S 0 2928 5.6618 D 495461 D Class B Common Stock 494100 D Class A Common Stock 91246 I See Footnote Class A Common Stock 694 I See Footnote Held by Mr. Casella's spouse. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities. Held in trust for the benefit of Mr. Casella's children. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities. Represents shares of stock sold for tax purposes in relation to the vesting of RSU's on May 30, 2015. /s/ John W. Casella 2015-06-11