WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in ATMU — Atmus Filtration Technologies Inc.
CIK 1644956
CHICAGO, IL
Position in ATMU
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$20,659,516
-$3,528,591 QoQ
Shares Held
405,168
-4.9% QoQ
Ownership
0.497%
of shares outstanding
% of Portfolio
0.06%
of 13F equity value
Holder Rank
#42
of 333 holders
Holding Since
Mar 2025
6 quarters on record
Voting authority
Sole 62%
Shared 0%
None 38%
Common Shares in ATMU Over Time
Shares Held
Position Value (USD)
Position in Auto Parts
Consumer Cyclical · as of Jun 30, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $632,812,810 across 7 Auto Parts names. ATMU ranks #5 (3.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | BWA |
Borgwarner Inc
|
3,784,707 | $251,304,544 | |
| 2 | ORLY |
O Reilly Automotive Inc
|
1,855,002 | $170,827,134 | |
| 3 | GTX |
Garrett Motion Inc.
|
3,232,883 | $117,127,351 | |
| 4 | MOD |
Modine Manufacturing Co
|
213,929 | $57,123,321 | |
| 5 | ATMU |
Atmus Filtration Technologies Inc.
This page
|
405,168 | $20,659,516 | |
| 6 | XPEL |
XPEL, Inc.
|
307,175 | $15,235,880 | |
| 7 | ALSN |
Allison Transmission Holdings Inc
|
4,746 | $535,064 |
All Filings in ATMU
Export CSV
6 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $20,659,516 | 405,168 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | $24,188,107 | 426,072 | Shares | Sole | 2026-05-08 | |
| 2025-12-31 | $35,401,166 | 681,972 | Shares | Sole | 2026-02-09 | |
| 2025-09-30 | $33,896,723 | 751,757 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $29,037,046 | 797,283 | Shares | Sole | 2025-07-29 | |
| 2025-03-31 | $31,591,142 | 860,091 | Shares | Sole | 2025-05-09 | |
| No filing history on record for this holder in this stock. | ||||||