Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in ATMU held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 6.8M | $386.7M | +0.6% | 8.339% | 0.01% |
| 2 | FMR LLC | 4.9M | $280.3M | +11.7% | 6.046% | 0.02% |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 3.7M | $209.5M | β | 4.517% | 0.01% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 3.6M | $202.5M | β | 4.367% | 0.01% |
| 5 | Invesco Ltd. | 3.3M | $189.8M | +22.6% | 4.094% | 0.03% |
| 6 | GOLDMAN SACHS GROUP INC | 3.3M | $186.8M | +2.8% | 4.029% | 0.02% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 2.6M | $150.2M | +8.9% | 3.239% | 0.01% |
| 8 | FIRST TRUST ADVISORS LP | 2.2M | $125.1M | +3.3% | 2.697% | 0.09% |
| 9 | STATE STREET CORP | 1.9M | $107.6M | -0.4% | 2.320% | 0.00% |
| 10 | MORGAN STANLEY | 1.7M | $98.6M | -18.2% | 2.127% | 0.01% |
| 11 | D. E. Shaw & Co., Inc. | 1.6M | $92.0M | +12.2% | 1.985% | 0.09% |
| 12 | JANUS HENDERSON GROUP PLC | 1.6M | $88.1M | +13.3% | 1.899% | 0.04% |
| 13 | Nuveen, LLC | 1.4M | $82.0M | +10.3% | 1.769% | 0.02% |
| 14 | WELLINGTON MANAGEMENT GROUP LLP | 1.4M | $78.7M | -13.5% | 1.698% | 0.01% |
| 15 | Channing Capital Management, LLC | 1.4M | $78.7M | -14.9% | 1.697% | 2.01% |
| 16 | MANGROVE PARTNERS | 1.3M | $74.7M | 0.0% | 1.610% | 6.04% |
| 17 | DIMENSIONAL FUND ADVISORS LP | 1.3M | $74.0M | +3.6% | 1.595% | 0.02% |
| 18 | EMINENCE CAPITAL, LP | 1.3M | $72.8M | -66.5% | 1.570% | 1.67% |
| 19 | WESTWOOD HOLDINGS GROUP INC | 1.2M | $70.3M | -10.3% | 1.517% | 0.51% |
| 20 | Neuberger Berman Group LLC | 1.2M | $66.7M | +21648.7% | 1.438% | 0.05% |
| 21 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1000K | $56.7M | +193.8% | 1.224% | 0.03% |
| 22 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 941K | $53.4M | +0.5% | 1.152% | 0.01% |
| 23 | Port Capital LLC | 909K | $51.6M | +3.6% | 1.113% | 2.29% |
| 24 | BANK OF AMERICA CORP /DE/ | 894K | $50.7M | +33.8% | 1.094% | 0.00% |
| 25 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 819K | $50.3M | -6.7% | 1.003% | 0.02% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in ATMU β a direct measure of their conviction.
Filings activity in ATMU during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new ATMU position in Q1 2026
Institutions that fully closed their ATMU position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 342 | +12% | 105.04% | +8.75 pp | $4.27B | +9.1% |
| Q4 2025 | 305 | +7.8% | 96.29% | +12.41 pp | $3.92B | +15% |
| Q3 2025 | 283 | +2.5% | 83.88% | +14.62 pp | $3.41B | +21% |
| Q2 2025 | 276 | +2.6% | 69.26% | +0.80 pp | $2.82B | +1.2% |
| Q1 2025 | 269 | 4.3% | 68.46% | 3.74 pp | $2.78B | 5.2% |
| Q4 2024 | 281 | +1.8% | 72.20% | +1.15 pp | $2.94B | +1.6% |
| Q3 2024 | 276 | +18% | 71.05% | +12.46 pp | $2.89B | +21% |
| Q2 2024 | 234 | β | 58.59% | β | $2.38B | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying ATMU stock.
Based on Q1 2026 13F filings, institutional ownership of Atmus Filtration Technologies Inc. stands at 105.0%, held across 342 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of ATMU, with approximately 6,810,861 shares worth $0.39B as of Q1 2026.
No marquee "smart money" managers (Berkshire, Burry, ARK, Tiger Global, Pershing Square, Baupost, etc.) currently appear among the top 25 institutional holders of ATMU.
Our composite Smart Money Score for ATMU is 56 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
76 institutions opened new positions in ATMU during Q1 2026, while 39 fully exited. 197 added to existing positions and 68 trimmed.
ATMU institutional ownership rose by 8.75 percentage points quarter-over-quarter, with a net change of +37 holders.
The top 10 institutions account for 45.3% of all reported 13F value in ATMU, and the top 25 account for 69.7%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Atmus Filtration Technologies Inc. (ATMU) Institutional Ownership