CLEAN HARBORS INC

On December 5, 2023, the Board of Directors of Clean Harbors authorized a $500.0 million expansion of the Company’s current share repurchase program resulting in $554.1 million available at December 31, 2023. The repurchase program authorizes the Company to purchase the Company's common stock on the open market or in privately negotiated transactions periodically in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases have depended and will depend on a number of factors including share price, cash required for future business plans, trading volume and other conditions. The Company has no obligation to repurchase stock under this program and may suspend or terminate the repurchase program at any time.

During the years ended December 31, 2023, 2022 and 2021, the Company repurchased and retired a total of 0.3 million,0.5 million and 0.6 million shares, respectively, of the Company's common stock for total costs of $51.2 million, $50.2 million and $54.4 million, respectively.