X0306 5 2020-12-31 0 0 0 0000822818 CLEAN HARBORS INC CLH 0001756568 Gabriel Sharon M. 42 LONGWATER DRIVE NORWELL MA 02061 0 1 0 0 EVP/CIO (CHESI) Common Stock 23046 D Item 5, Amount of Securities Beneficially Owned at end of Issuer's Fiscal Year, (i) increased by 26 shares to correct Form 3 filed in 2018, and (ii) reduced by 1,000 shares due to error on a Form 4 filed on 12/17/2019." Sharon M. Gabriel 2021-02-16