ATMU · Insider Trading
Atmus Filtration Technologies Inc.
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-18 | Renee Swan | Chief People Officer | Sell | −3,870 | −$196.96K |
| 2026-08-13 | Stephen E. Macadam | Director | Buy | +2,000 | +$99.55K |
| 2026-06-02 | Renee Swan | Chief People Officer | Sell | −2,566 | −$116.10K |
| 2026-06-02 | Charles Masters | Senior Vice President | Sell | −2,890 | −$130.76K |
| 2026-06-02 | Stephanie Disher | Chief Executive Officer | Sell | −25,652 | −$1.16M |
| 2026-06-02 | Jack Kienzler | Chief Financial Officer | Sell | −5,132 | −$232.21K |
| 2026-05-13 | Roy Edwin Bennett | Director | A | +2,619 | — |
| 2026-05-13 | Stephen E. Macadam | Director | A | +2,619 | — |
| 2026-05-13 | Kevin N Carpenter | SVP-Chief Supply Chain Officer | A | +28,509 | — |
| 2026-05-13 | Jane A Leipold | Director | A | +2,619 | — |
| 2026-05-13 | Gretchen R Haggerty | Director | MIXED | +4,592 | +$110.00K |
| 2026-05-13 | Heath Sharp | Director | A | +2,619 | — |
| 2026-05-13 | Diego Donoso | Director | A | +2,619 | — |
| 2026-05-13 | Stuart A Taylor II | Director | A | +2,619 | — |
| 2026-04-02 | Jack Kienzler | Chief Financial Officer | A | +5,163 | — |
| 2026-04-02 | Stephanie Disher | Chief Executive Officer | A | +31,492 | — |
| 2026-04-02 | Laura Heltebran | CLO & Corp Sec | A | +3,717 | — |
| 2026-04-02 | Charles Masters | Senior Vice President | A | +4,130 | — |
| 2026-04-02 | Renee Swan | Chief People Officer | A | +1,962 | — |
| 2026-03-03 | Jack Kienzler | Chief Financial Officer | F | −20,117 | −$1.30M |
| 2026-03-03 | Renee Swan | Chief People Officer | F | −11,824 | −$763.00K |
| 2026-03-03 | Charles Masters | Senior Vice President | F | −11,177 | −$721.25K |
| 2026-03-03 | Stephanie Disher | Chief Executive Officer | F | −82,493 | −$5.32M |
| 2026-02-17 | Charles Masters | Senior Vice President | A | +21,152 | — |
| 2026-02-17 | Renee Swan | Chief People Officer | A | +18,536 | — |
| 2026-02-17 | Stephanie Disher | Chief Executive Officer | A | +169,209 | — |
| 2026-02-17 | Jack Kienzler | Chief Financial Officer | A | +41,094 | — |
| 2026-02-09 | Heath Sharp | Director | A | +614 | — |
| 2025-11-19 | Diego Donoso | Director | MIXED | — | −$676 |
| 2025-10-07 | Charles Masters | Senior Vice President | F | −28 | −$1.25K |
| 2025-10-07 | Jack Kienzler | Chief Financial Officer | F | −25 | −$1.11K |
| 2025-08-15 | Renee Swan | Chief People Officer | F | −5,007 | −$226.22K |
| 2025-05-21 | Stephen E. Macadam | Director | A | +3,886 | — |
| 2025-05-21 | Gretchen R Haggerty | Director | A | +3,886 | — |
| 2025-05-21 | Diego Donoso | Director | A | +3,886 | — |
| 2025-05-21 | Stuart A Taylor II | Director | A | +3,886 | — |
| 2025-05-21 | Roy Edwin Bennett | Director | A | +3,886 | — |
| 2025-05-21 | Jane A Leipold | Director | A | +3,886 | — |
| 2025-05-13 | Laura Heltebran | CLO & Corp Sec | A | +20,444 | — |
| 2025-04-03 | Stephanie Disher | Chief Executive Officer | A | +40,021 | — |
| 2025-04-03 | Charles Masters | Senior Vice President | A | +4,402 | — |
| 2025-04-03 | Jack Kienzler | Chief Financial Officer | A | +6,804 | — |
| 2025-04-03 | Renee Swan | Chief People Officer | A | +2,802 | — |
| 2025-03-05 | Charles Masters | Senior Vice President | F | −1,306 | −$51.98K |
| 2025-03-05 | Stephanie Disher | Chief Executive Officer | F | −5,178 | −$206.08K |
| 2025-03-05 | Jack Kienzler | Chief Financial Officer | F | −839 | −$33.39K |
| 2025-02-19 | Charles Masters | Senior Vice President | A | +2,252 | — |
| 2025-02-19 | Jack Kienzler | Chief Financial Officer | A | +1,535 | — |
| 2025-02-19 | Stephanie Disher | Chief Executive Officer | A | +11,003 | — |
| 2025-01-23 | Charles Masters | VP, Engine Products | F | −20 | −$759 |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Stephanie Disher | Chief Executive Officer | 363,024 | $20.03M |
| Jack Kienzler | Chief Financial Officer | 75,804 | $4.18M |
| Renee Swan | Chief People Officer | 46,875 | $2.59M |
| Charles Masters | Senior Vice President | 43,579 | $2.40M |
| Stephen E. Macadam | Director | 40,588 | $2.24M |
| Kevin N Carpenter | SVP-Chief Supply Chain Officer | 28,509 | $1.57M |
| Laura Heltebran | CLO & Corp Sec | 24,161 | $1.33M |
| Gretchen R Haggerty | Director | 23,868 | $1.32M |
| Jane A Leipold | Director | 20,538 | $1.13M |
| Roy Edwin Bennett | Director | 19,320 | $1.07M |
| Stuart A Taylor II | Director | 11,697 | $645.27K |
| Diego Donoso | Director | 11,697 | $645.27K |
| Heath Sharp | Director | 5,733 | $316.26K |
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.
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.