Question 1

How many shares of ATMU does FRONTIER CAPITAL MANAGEMENT CO LLC own?

Accepted Answer

As of 2026-Q2, FRONTIER CAPITAL MANAGEMENT CO LLC holds 1.2M shares of ATMU (ATMUS FILTRATION TECHNOLOGIE).

Question 2

What is FRONTIER CAPITAL MANAGEMENT CO LLC's ATMU position worth?

Accepted Answer

As of 2026-Q2, FRONTIER CAPITAL MANAGEMENT CO LLC's ATMU position is worth $59M.

Question 3

Is FRONTIER CAPITAL MANAGEMENT CO LLC buying or selling ATMU?

Accepted Answer

In 2026-Q2, FRONTIER CAPITAL MANAGEMENT CO LLC increased their ATMU position (+56.0% change in shares).

Question 4

When did FRONTIER CAPITAL MANAGEMENT CO LLC first buy ATMU?

Accepted Answer

Based on available 13F filings, FRONTIER CAPITAL MANAGEMENT CO LLC first reported a position in ATMU in 2024-Q3. They have held the position across 8 quarters.

Quarter	Action	Shares	Change	Value	Weight	Price	Conviction
2026-Q2 Latest	Increased	1.2M	+56.0%	$59M	0.6%	$50.99	59
2026-Q1	Increased	742,221	+13.6%	$42.1M	0.4%	$62.85	39
2025-Q4	Increased	653,554	+77.3%	$33.9M	0.4%	$52.33	53
2025-Q3	Increased	368,626	+8.6%	$16.6M	0.1%	$45.18	37
2025-Q2	Increased	339,303	+34.8%	$12.4M	0.1%	$35.74	43
2025-Q1	Decreased	251,770	-28.6%	$9.2M	0.1%	$37.42	0
2024-Q4	Increased	352,526	+69.5%	$13.8M	0.1%	$38.53	50
2024-Q3	New	207,983	-	$7.8M	0.1%	$37.14	38

ATMU8 quarters

ATMU
8 quarters