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Of the 10 tracked institutions holding ATMU, 3 have a 3-year clone track record — 3 of them beat the S&P. Average holder's clone alpha: +3.7pt. It's a gauge of who owns the name, not just how many.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
Among the 10 tracked institutional investors we monitor, ATMU (ATMUS FILTRATION TECHNOLOGIE) is held with a combined value of $1.78B across 34,841,350 shares. The largest holder is BlackRock, Inc. with a position worth $631.62M. ARMISTICE CAPITAL, LLC opened a new position in the most recent quarter. 4 funds increased their holdings. 5 funds reduced their position.
Total Institutional Value
$1.78B
Total Shares Held
34,841,350
Institutional Holders
10
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $631.62M | 0.01% | +81.9% |
| 2 | VANGUARD GROUP INC | $407.09M | 0.01% | -1.7% |
| 3 | FMR LLC | $271.08M | 0.01% | +7.7% |
| 4 | PRICE T ROWE ASSOCIATES INC /MD/ | $223.76M | 0.02% | -2.2% |
| 5 | STATE STREET CORP | $166.04M | 0.00% | +71.8% |
| 6 | WELLINGTON MANAGEMENT GROUP LLP | $73.72M | 0.01% | +4.3% |
| 7 | AQR CAPITAL MANAGEMENT LLC | $4.55M | 0.00% | -18.9% |
| 8 | CITADEL ADVISORS LLC | $4.46M | 0.00% | -62.1% |
| 9 | TWO SIGMA ADVISERS, LP | $1.22M | 0.00% | -86.8% |
| 10 | ARMISTICE CAPITAL, LLC | $262.14K | 0.01% | New |
As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of ATMU with a position worth $631.62M, representing 0.01% of their portfolio. In total, 10 institutional investors hold ATMU with a combined value of $1.78B.
In the most recent quarter, 1 fund opened a new position in ATMU. Additionally, 4 increased their holdings and 5 reduced their positions.
Institutional investors hold $1.78B worth of ATMU stock across 10 positions. The largest institutional holder is BlackRock, Inc. with $631.62M in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For ATMU, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their ATMU positions.
| 2026-08-06 |
| 5.7% | 2026-07-31 |
SEC Schedule 13D (activist) and 13G (passive) filings for ATMU. Filed when an investor acquires 5%+ ownership.
Last Close
$45.70
2026-10-02
YTD
-12.8%
13% of 52-week range