ATMUS FILTRATION (ATMU): Ownership & Insider Activity
Hedge funds and institutional managers reporting a position in ATMU · Industrials. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.
Reported Holders
13
13F filers
Aggregate Value
$142.8M
Across holders
Last Price
$44.34
2026-10-19
Sector
Industrials
GICS
Quarterly fund activity4 increased9 reduced9 exited
| Manager⇅ | Type⇅ | Shares⇅ | Market Value▼ | % of Total⇅ | % of Portfolio⇅ | Action⇅ | QoQ Change⇅ | Quarter⇅ |
|---|---|---|---|---|---|---|---|---|
| MARSHALL WACE, LLP CIK 0001318757 | Hedge Fund | 806K | $41.1M | 28.8% | 0.0% | Added | +$20.0M | Q2 2026 |
| Woodline Partners LP CIK 0001784547 | Hedge Fund | 607K | $31.0M | 21.7% | 0.1% | Added | +$12.8M | Q2 2026 |
| SHAW D E & CO INC CIK 0001009207 | Hedge Fund | 482K | $24.6M | 17.2% | 0.0% | Reduced | +$18.0M | Q2 2026 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP CIK 0001164508 | Hedge Fund | 384K | $19.6M | 13.7% | 0.0% | Reduced | $-31.4M | Q2 2026 |
| Ancora Advisors, LLC CIK 0001446114 | Hedge Fund | 139K | $7.1M | 5.0% | 0.1% | Reduced | $-13.4M | Q2 2026 |
| AQR CAPITAL MANAGEMENT LLC CIK 0001167557 | Hedge Fund | 89K | $4.6M | 3.2% | 0.0% | Reduced | +$4.5M | Q2 2026 |
| CITADEL ADVISORS LLC CIK 0001423053 | Hedge Fund | 87K | $4.5M | 3.1% | 0.0% | Reduced | +$3.8M | Q2 2026 |
| AXIOM INVESTORS LLC /DE CIK 0001109147 | Hedge Fund | 80K | $4.1M | 2.9% | 0.0% | Reduced | $-6.3M | Q2 2026 |
| Verition Fund Management LLC CIK 0001454027 | Hedge Fund | 75K | $3.8M | 2.7% | 0.0% | Added | — | Q2 2026 |
| TWO SIGMA INVESTMENTS, LP CIK 0001179392 | Hedge Fund | 30K | $1.5M | 1.1% | 0.0% | Reduced | $-2.8M | Q2 2026 |
Added
Hedge Fund
$41.1M· 28.8% of total· 0.0% port· 806K sh· +$20.0M QoQ· Q2 2026
Added
Hedge Fund
$31.0M· 21.7% of total· 0.1% port· 607K sh· +$12.8M QoQ· Q2 2026
Reduced
Hedge Fund
$24.6M· 17.2% of total· 0.0% port· 482K sh· +$18.0M QoQ· Q2 2026
Reduced
Hedge Fund
$19.6M· 13.7% of total· 0.0% port· 384K sh· $-31.4M QoQ· Q2 2026
Reduced
Hedge Fund
$7.1M· 5.0% of total· 0.1% port· 139K sh· $-13.4M QoQ· Q2 2026
Reduced
Hedge Fund
$4.6M· 3.2% of total· 0.0% port· 89K sh· +$4.5M QoQ· Q2 2026
Reduced
Hedge Fund
$4.5M· 3.1% of total· 0.0% port· 87K sh· +$3.8M QoQ· Q2 2026
Reduced
Hedge Fund
$4.1M· 2.9% of total· 0.0% port· 80K sh· $-6.3M QoQ· Q2 2026
Added
Hedge Fund
$3.8M· 2.7% of total· 0.0% port· 75K sh· — QoQ· Q2 2026
Reduced
Hedge Fund
$1.5M· 1.1% of total· 0.0% port· 30K sh· $-2.8M QoQ· Q2 2026
Reduced
Hedge Fund
$701K· 0.5% of total· 0.0% port· 14K sh· $-3.2M QoQ· Q2 2026
Reduced
Hedge Fund
$205K· 0.1% of total· 0.0% port· 4K sh· $-3.0M QoQ· Q2 2026
Added
Hedge Fund
$102K· 0.1% of total· 0.0% port· 2K sh· $-90K QoQ· Q2 2026
1–10 of 13
1 / 2
Recent insider activity
Form 4 purchases and sales · 24 Jul 2026 – 21 Oct 20261 buyers · $100K1 sellers · $197K2 transactions
| Insider ⇅ | Trades ⇅ | Bought ⇅ | Sold ⇅ | Largest ⇅ | Latest ▼ | |
|---|---|---|---|---|---|---|
| Swan Renee Chief People Officer | 1 0 buy · 1 sell | — | $197K | $197K | 17 Aug 2026SEC ↗ | |
| Macadam Stephen E. Director | 1 1 buy · 0 sell | $100K | — | $100K | 12 Aug 2026SEC ↗ |
Distinct buyers and sellers may overlap. “Largest” is the largest reported transaction value in this window. Expand a row to see up to five recent filings.