ATMU (Atmus Filtration Technologies Inc.)
Insider Trading Activity
Every open-market purchase and sale reported by ATMU officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-18 | Renee Swan | Chief People Officer | Sell | — | — |
| 2026-08-13 | Stephen E. Macadam | Director | Buy | — | — |
| 2026-06-02 | Renee Swan | Chief People Officer | Sell | — | — |
| 2026-06-02 | Charles Masters | Senior Vice President | Sell | — | — |
| 2026-06-02 | Stephanie Disher | Chief Executive Officer | Sell | — | — |
| 2026-06-02 | Jack Kienzler | Chief Financial Officer | Sell | — | — |
| 2026-05-13 | Roy Edwin Bennett | Director | A | — | — |
| 2026-05-13 | Stephen E. Macadam | Director | A | — | — |
| 2026-05-13 | Kevin N Carpenter | SVP-Chief Supply Chain Officer | A | — | — |
| 2026-05-13 | Jane A Leipold | Director | A | — | — |
| 2026-05-13 | GRETCHEN R HAGGERTY | Director | MIXED | — | — |
| 2026-05-13 | Heath Sharp | Director | A | — | — |
| 2026-05-13 | Diego Donoso | Director | A | — | — |
| 2026-05-13 | STUART A TAYLOR II | Director | A | — | — |
| 2026-04-02 | Jack Kienzler | Chief Financial Officer | A | — | — |
| 2026-04-02 | Stephanie Disher | Chief Executive Officer | A | — | — |
| 2026-04-02 | Laura Heltebran | CLO & Corp Sec | A | — | — |
| 2026-04-02 | Charles Masters | Senior Vice President | A | — | — |
| 2026-04-02 | Renee Swan | Chief People Officer | A | — | — |
| 2026-03-03 | Jack Kienzler | Chief Financial Officer | F | — | — |
| 2026-03-03 | Renee Swan | Chief People Officer | F | — | — |
| 2026-03-03 | Charles Masters | Senior Vice President | F | — | — |
| 2026-03-03 | Stephanie Disher | Chief Executive Officer | F | — | — |
| 2026-02-17 | Charles Masters | Senior Vice President | A | — | — |
| 2026-02-17 | Renee Swan | Chief People Officer | A | — | — |
| 2026-02-17 | Stephanie Disher | Chief Executive Officer | A | — | — |
| 2026-02-17 | Jack Kienzler | Chief Financial Officer | A | — | — |
| 2026-02-09 | Heath Sharp | Director | A | — | — |
| 2025-11-19 | Diego Donoso | Director | MIXED | — | — |
| 2025-10-07 | Charles Masters | Senior Vice President | F | — | — |
| 2025-10-07 | Jack Kienzler | Chief Financial Officer | F | — | — |
| 2025-08-15 | Renee Swan | Chief People Officer | F | — | — |
| 2025-05-21 | Stephen E. Macadam | Director | A | — | — |
| 2025-05-21 | GRETCHEN R HAGGERTY | Director | A | — | — |
| 2025-05-21 | Diego Donoso | Director | A | — | — |
| 2025-05-21 | STUART A TAYLOR II | Director | A | — | — |
| 2025-05-21 | Roy Edwin Bennett | Director | A | — | — |
| 2025-05-21 | Jane A Leipold | Director | A | — | — |
| 2025-05-13 | Laura Heltebran | CLO & Corp Sec | A | — | — |
| 2025-04-03 | Stephanie Disher | Chief Executive Officer | A | — | — |
| 2025-04-03 | Charles Masters | Senior Vice President | A | — | — |
| 2025-04-03 | Jack Kienzler | Chief Financial Officer | A | — | — |
| 2025-04-03 | Renee Swan | Chief People Officer | A | — | — |
| 2025-03-05 | Charles Masters | Senior Vice President | F | — | — |
| 2025-03-05 | Stephanie Disher | Chief Executive Officer | F | — | — |
| 2025-03-05 | Jack Kienzler | Chief Financial Officer | F | — | — |
| 2025-02-19 | Charles Masters | Senior Vice President | A | — | — |
| 2025-02-19 | Jack Kienzler | Chief Financial Officer | A | — | — |
| 2025-02-19 | Stephanie Disher | Chief Executive Officer | A | — | — |
| 2025-01-23 | Charles Masters | VP, Engine Products | F | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | Chief Executive Officer | 363,024 | — |
| — | Chief Financial Officer | 75,804 | — |
| — | Chief People Officer | 46,875 | — |
| — | Senior Vice President | 43,579 | — |
| — | Director | 40,588 | — |
| — | SVP-Chief Supply Chain Officer | 28,509 | — |
| — | Chief Legal Officer | 25,629 | — |
| — | CLO & Corp Sec | 24,161 | — |
| — | Director | 23,868 | — |
| — | Director | 20,538 | — |
| — | Director | 19,320 | — |
| — | Director | 11,697 | — |
| — | Director | 11,697 | — |
| — | Director | 5,733 | — |
| — | Director | 4,012 | — |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the ATMU quote page; the site-wide leaderboard is on the insider transactions hub.