WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in ATMU — Atmus Filtration Technologies Inc.
CIK 1644956
CHICAGO, IL
Position in ATMU
as of Mar 31, 2026
· filed May 8, 2026
Position Value
$24,188,107
-$11,213,059 QoQ
Shares Held
426,072
-37.5% QoQ
Ownership
0.522%
of shares outstanding
% of Portfolio
0.08%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2025
5 quarters on record
Voting authority
Sole 69%
Shared 0%
None 31%
Common Shares in ATMU Over Time
Shares Held
Position Value (USD)
Position in Auto Parts
Consumer Cyclical · as of Mar 31, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $542,681,839 across 6 Auto Parts names. ATMU ranks #5 (4.5% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ORLY |
O Reilly Automotive Inc
|
2,210,034 | $204,008,238 | |
| 2 | BWA |
Borgwarner Inc
|
2,884,062 | $156,489,204 | |
| 3 | GTX |
Garrett Motion Inc.
|
5,762,697 | $104,708,204 | |
| 4 | MOD |
Modine Manufacturing Co
|
243,343 | $52,734,861 | |
| 5 | ATMU |
Atmus Filtration Technologies Inc.
This page
|
426,072 | $24,188,107 | |
| 6 | ALSN |
Allison Transmission Holdings Inc
|
4,726 | $553,225 |
All Filings in ATMU
Export CSV
5 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 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. | ||||||