CECO ENVIRONMENTAL CORP

Ticker: CECO CUSIP: 125141101 Class: Common Stock

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

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

Q4 2025

Shares 706,273 Value ($000) $42,270 Avg Close $53.49 Range $42.82 - $63.98

Q3 2025

Shares 685,742 Value ($000) $35,110 Avg Close $42.33 Range $28.26 - $52.46

Q2 2025

Shares 945,897 Value ($000) $26,778 Avg Close $24.90 Range $17.57 - $30.56

Q1 2025

Shares 901,587 Value ($000) $20,556 Avg Close $26.66 Range $22.33 - $33.42

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	706,273	$42,270	$53.49	$42.82 - $63.98
Q3 2025	685,742	$35,110	$42.33	$28.26 - $52.46
Q2 2025	945,897	$26,778	$24.90	$17.57 - $30.56
Q1 2025	901,587	$20,556	$26.66	$22.33 - $33.42