CLEAN HARBORS INC

Ticker: CLH CUSIP: 184496107 Class: EQTY

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 339,351 Value ($000) $79,571 Avg Close $228.49 Range $201.34 - $248.07

Q3 2025

Shares 384,358 Value ($000) $89,256 Avg Close $236.75 Range $218.46 - $251.43

Q2 2025

Shares 411,432 Value ($000) $95,115 Avg Close $218.92 Range $178.29 - $235.43

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	339,351	$79,571	$228.49	$201.34 - $248.07
Q3 2025	384,358	$89,256	$236.75	$218.46 - $251.43
Q2 2025	411,432	$95,115	$218.92	$178.29 - $235.43