Atmus Filtration Technologies Inc. (ATMU) has 12 known insider and institutional holders on record. The largest holder is Disher Stephanie with 388,676 shares. Other notable holders include Kienzler Jack and Swan Renee.
Over the last 12 months, insiders have made 31 transactions in ATMU stock — 20 buys (valued at $1.81K) and 2 sells (valued at $2.49K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
ATMU Insider Ownership
Top Holder
Disher Stephanie
388,676 shares
Buys (12 mo)
20
$1.81K value
Sells (12 mo)
2
$2.49K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Disher Stephanie |
Chief Executive Officer |
388,676 |
2026-04-02 |
|
| 2 |
Kienzler Jack |
Chief Financial Officer |
80,936 |
2026-04-02 |
|
| 3 |
Swan Renee |
Chief People Officer |
53,311 |
2026-04-02 |
|
| 4 |
Masters Charles |
Senior Vice President |
46,469 |
2026-04-02 |
|
| 5 |
Macadam Stephen E. |
Director |
35,969 |
2025-05-21 |
|
| 6 |
Heltebran Laura |
CLO & Corp Sec |
24,161 |
2026-04-02 |
|
| 7 |
Haggerty Gretchen R |
Director |
23,768 |
2025-05-21 |
|
| 8 |
Leipold Jane A |
Director |
17,919 |
2025-05-21 |
|
| 9 |
Bennett Roy Edwin |
Director |
16,701 |
2025-05-21 |
|
| 10 |
Taylor Stuart A Ii |
Director |
9,078 |
2025-05-21 |
|
| 11 |
Donoso Diego |
Director |
9,038 |
2025-11-19 |
|
| 12 |
Sharp Heath |
Director |
3,114 |
2026-02-09 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-04-01 |
Swan Renee |
Chief People Officer |
RSU Award |
1,962 |
- |
- |
| 2026-04-01 |
Kienzler Jack |
Chief Financial Officer |
RSU Award |
5,163 |
- |
- |
| 2026-04-01 |
Masters Charles |
Senior Vice President |
RSU Award |
4,130 |
- |
- |
| 2026-04-01 |
Disher Stephanie |
Chief Executive Officer |
RSU Award |
31,492 |
- |
- |
| 2026-04-01 |
Heltebran Laura |
CLO & Corp Sec |
RSU Award |
3,717 |
- |
- |
| 2026-02-27 |
Swan Renee |
Chief People Officer |
Tax Withholding of RSU |
2,254 |
$64.53 |
$145.45K |
| 2026-02-27 |
Kienzler Jack |
Chief Financial Officer |
Tax Withholding of RSU |
3,851 |
$64.53 |
$248.51K |
| 2026-02-27 |
Masters Charles |
Senior Vice President |
Tax Withholding of RSU |
2,131 |
$64.53 |
$137.51K |
| 2026-02-27 |
Disher Stephanie |
Chief Executive Officer |
Tax Withholding of RSU |
15,854 |
$64.53 |
$1.02M |
| 2026-02-13 |
Swan Renee |
Chief People Officer |
RSU Award |
18,536 |
- |
- |
| 2026-02-13 |
Kienzler Jack |
Chief Financial Officer |
RSU Award |
41,094 |
- |
- |
| 2026-02-13 |
Masters Charles |
Senior Vice President |
RSU Award |
21,152 |
- |
- |
| 2026-02-13 |
Disher Stephanie |
Chief Executive Officer |
RSU Award |
169,209 |
- |
- |
| 2026-02-05 |
Sharp Heath |
Director |
RSU Award |
614 |
- |
- |
| 2026-02-05 |
Sharp Heath |
Director |
Unknown |
- |
- |
- |
| 2025-11-18 |
Donoso Diego |
Director |
Other (Buy) |
20 |
- |
- |
| 2025-11-13 |
Donoso Diego |
Director |
Informative Sell |
20 |
$48.84 |
$976.80 |
| 2025-09-05 |
Donoso Diego |
Director |
Informative Buy |
15 |
$45.81 |
$687.15 |
| 2025-08-13 |
Donoso Diego |
Director |
Informative Buy |
25 |
$45.00 |
$1.13K |
| 2025-04-02 |
Donoso Diego |
Director |
Informative Sell |
40 |
$37.79 |
$1.51K |
| 2025-10-03 |
Kienzler Jack |
Chief Financial Officer |
Tax Withholding of RSU |
25 |
$44.50 |
$1.11K |
| 2025-10-03 |
Masters Charles |
Senior Vice President |
Tax Withholding of RSU |
28 |
$44.50 |
$1.25K |
| 2025-08-14 |
Swan Renee |
Chief People Officer |
Tax Withholding of RSU |
5,007 |
$45.18 |
$226.22K |
| 2025-05-20 |
Bennett Roy Edwin |
Director |
RSU Award |
3,886 |
- |
- |
| 2025-05-20 |
Donoso Diego |
Director |
RSU Award |
3,886 |
- |
- |
