ATMUS FILTRATION TECHNOLOGIE

Ticker: ATMU CUSIP: 04956D107 Class: Common Stock

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

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

Q4 2025

Shares 681,972 Value ($000) $35,401 Avg Close $48.33 Range $42.52 - $54.79

Q3 2025

Shares 751,757 Value ($000) $33,897 Avg Close $41.84 Range $35.97 - $47.01

Q2 2025

Shares 797,283 Value ($000) $29,037 Avg Close $35.53 Range $30.80 - $38.98

Q1 2025

Shares 860,091 Value ($000) $31,591 Avg Close $39.25 Range $35.50 - $43.83

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	681,972	$35,401	$48.33	$42.52 - $54.79
Q3 2025	751,757	$33,897	$41.84	$35.97 - $47.01
Q2 2025	797,283	$29,037	$35.53	$30.80 - $38.98
Q1 2025	860,091	$31,591	$39.25	$35.50 - $43.83