Who owns Atmus Filtration Technologies (ATMU)
Which tracked institutional funds hold ATMU, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See ATMU company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
61 tracked funds added or opened ATMU while 126 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
ATMU’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes ATMU more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in ATMU divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 311 tracked filers holding ATMU, 165 increased or opened the position and 195 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in ATMU between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 16
- Jupiter Topco LLC$83M
- Boston Partners$25M
- Public Sector Pension Investment Board$17M
- Verition Fund Management LLC$4M
- Illinois Municipal Retirement Fund$2M
- Louisiana State Employees Retirement System$2M
Full exits 49
- T. Rowe Price Investment Management, Inc.$90M
- JANUS HENDERSON GROUP PLC$88M
- EMINENCE CAPITAL, LP$73M
- Parsifal Capital Management, LP$45M
- Qube Research & Technologies Ltd$42M
- ALGERT GLOBAL LLC$29M
Largest adds
- BlackRock, Inc.$315M
- STATE STREET CORP$58M
- NEUBERGER BERMAN GROUP LLC$57M
- Invesco Ltd.$46M
- VANGUARD PORTFOLIO MANAGEMENT LLC$25M
- MARSHALL WACE, LLP$23M
Largest trims
- D. E. Shaw & Co., Inc.$67M
- FIRST TRUST ADVISORS LP$44M
- GOLDMAN SACHS GROUP INC$39M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$37M
- Nuveen, LLC$35M
- PRICE T ROWE ASSOCIATES INC /MD/$31M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 12,387,072 | $632M | 14.9% | 2026-Q2 |
| FMR LLC added | 5,316,383 | $271M | 6.4% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 4,604,869 | $235M | 5.5% | 2026-Q2 |
| Invesco Ltd. added | 4,457,550 | $227M | 5.4% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ trimmed | 4,388,256 | $224M | 5.3% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,609,746 | $184M | 4.3% | 2026-Q2 |
| STATE STREET CORP added | 3,256,278 | $166M | 3.9% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 2,903,771 | $148M | 3.5% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 2,868,271 | $146M | 3.4% | 2026-Q2 |
| NEUBERGER BERMAN GROUP LLC added | 2,420,647 | $123M | 2.9% | 2026-Q2 |
| Channing Capital Management, LLC added | 1,725,956 | $88M | 2.1% | 2026-Q2 |
| Jupiter Topco LLC new | 1,631,709 | $83M | 2.0% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,618,166 | $83M | 1.9% | 2026-Q2 |
| FIRST TRUST ADVISORS LP trimmed | 1,586,834 | $81M | 1.9% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 1,460,934 | $74M | 1.8% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 1,445,763 | $74M | 1.7% | 2026-Q2 |
| WESTWOOD HOLDINGS GROUP INC added | 1,397,165 | $71M | 1.7% | 2026-Q2 |
| MANGROVE PARTNERS IM, LLC trimmed | 1,211,236 | $62M | 1.5% | 2026-Q2 |
| FRONTIER CAPITAL MANAGEMENT CO LLC added | 1,157,930 | $59M | 1.4% | 2026-Q2 |
| Port Capital LLC added | 1,034,293 | $53M | 1.2% | 2026-Q2 |
| ROYCE & ASSOCIATES LP added | 995,247 | $51M | 1.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 957,068 | $49M | 1.1% | 2026-Q2 |
| Nuveen, LLC trimmed | 930,518 | $47M | 1.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 915,569 | $47M | 1.1% | 2026-Q2 |
| NORTHERN TRUST CORP added | 852,441 | $43M | 1.0% | 2026-Q2 |
| MARSHALL WACE, LLP added | 806,251 | $41M | 1.0% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 767,841 | $39M | 0.9% | 2026-Q2 |
| Boston Trust Walden Corp trimmed | 709,764 | $36M | 0.9% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 702,658 | $36M | 0.8% | 2026-Q2 |
| Woodline Partners LP added | 607,471 | $31M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 583,865 | $30M | 0.7% | 2026-Q2 |
| Bank of New York Mellon Corp added | 578,864 | $30M | 0.7% | 2026-Q2 |
| TEACHER RETIREMENT SYSTEM OF TEXAS added | 533,685 | $27M | 0.6% | 2026-Q2 |
| Aberdeen Group plc added | 521,724 | $27M | 0.6% | 2026-Q2 |
| Boston Partners trimmed | 494,688 | $25M | 0.6% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ trimmed | 484,705 | $25M | 0.6% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 482,392 | $25M | 0.6% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 482,029 | $25M | 0.6% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 478,265 | $24M | 0.6% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 457,331 | $23M | 0.5% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 405,168 | $21M | 0.5% | 2026-Q2 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ trimmed | 403,485 | $21M | 0.5% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 401,126 | $20M | 0.5% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 395,982 | $20M | 0.5% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 387,641 | $20M | 0.5% | 2026-Q2 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 383,637 | $20M | 0.5% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 378,117 | $19M | 0.5% | 2026-Q2 |
| UBS Group AG trimmed | 372,005 | $19M | 0.4% | 2026-Q2 |
| Allspring Global Investments Holdings, LLC added | 370,081 | $18M | 0.4% | 2026-Q2 |
| Public Sector Pension Investment Board new | 326,823 | $17M | 0.4% | 2026-Q2 |
| Medina Value Partners, LLC added | 318,986 | $16M | 0.4% | 2026-Q2 |
| ALTRINSIC GLOBAL ADVISORS LLC added | 296,885 | $15M | 0.4% | 2026-Q2 |
| LOOMIS SAYLES & CO L P trimmed | 288,585 | $15M | 0.3% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND trimmed | 262,643 | $13M | 0.3% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 198,836 | $10M | 0.2% | 2026-Q2 |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC added | 197,796 | $10M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 196,800 | $10M | 0.2% | 2026-Q2 |
| Legal & General Group Plc added | 186,323 | $10M | 0.2% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 176,263 | $9M | 0.2% | 2026-Q2 |
| Swiss National Bank added | 163,849 | $8M | 0.2% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 155,476 | $8M | 0.2% | 2026-Q2 |
| Ancora Advisors LLC trimmed | 138,859 | $7M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 130,054 | $7M | 0.2% | 2026-Q2 |
| Tidal Investments LLC added | 123,691 | $6M | 0.1% | 2026-Q2 |
| PRENTISS SMITH & CO INC added | 120,486 | $6M | 0.1% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC trimmed | 119,435 | $6M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 116,783 | $7M | 0.2% | 2026-Q2 |
| Tema ETFs LLC added | 105,917 | $5M | 0.1% | 2026-Q2 |
| Vest Financial, LLC trimmed | 103,353 | $5M | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM trimmed | 94,700 | $5M | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 94,020 | $5M | 0.1% | 2026-Q2 |
| FIFTH THIRD BANCORP added | 93,503 | $5M | 0.1% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC trimmed | 92,175 | $5M | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 91,098 | $5M | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 90,521 | $5M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 89,324 | $5M | 0.1% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 87,448 | $4M | 0.1% | 2026-Q2 |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC added | 85,218 | $4M | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 80,334 | $4M | 0.1% | 2026-Q2 |
| AXIOM INVESTORS LLC /DE trimmed | 80,165 | $4M | 0.1% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC trimmed | 79,063 | $4M | 0.1% | 2026-Q2 |
| Marathon Partners Equity Management, LLC added | 77,000 | $4M | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC trimmed | 74,959 | $4M | 0.1% | 2026-Q2 |
| Verition Fund Management LLC added | 74,880 | $4M | 0.1% | 2026-Q2 |
| Moody Aldrich Partners LLC trimmed | 72,398 | $4M | 0.1% | 2026-Q2 |
| EFG International AG added | 72,274 | $4M | 0.1% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 66,915 | $3M | 0.1% | 2026-Q2 |
| Connor, Clark & Lunn Investment Management Ltd. added | 63,099 | $3M | 0.1% | 2026-Q2 |
| Emerald Investment Advisers, LLC added | 62,996 | $3M | 0.1% | 2026-Q2 |
| Livforsakringsbolaget Skandia, Omsesidigt trimmed | 61,600 | $3M | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 61,410 | $3M | 0.1% | 2026-Q2 |
| Jain Global LLC added | 60,343 | $3M | 0.1% | 2026-Q2 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO added | 59,984 | $3M | 0.1% | 2026-Q2 |
| NORGES BANK trimmed | 53,213 | $3M | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 53,096 | $3M | 0.1% | 2026-Q2 |
| TD Asset Management Inc trimmed | 52,972 | $3M | 0.1% | 2026-Q2 |
| CAPITAL FUND MANAGEMENT S.A. trimmed | 50,802 | $3M | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 48,721 | $2M | 0.1% | 2026-Q2 |
| WESBANCO BANK INC | 48,400 | $2M | 0.1% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC added | 47,970 | $2M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.