ATMU Atmus Filtration Technologies Inc.

NYSE
$43.89

Atmus Filtration Technologies Inc. (ATMU) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal Bearish Selling ran elevated versus ATMU's own trailing one-year pace, with 0% of sale value under a prearranged plan.
Cluster activity 0 buyers in the last 30 days 1 buyer in the last 90 days 1 seller in the last 90 days
Insiders buying
2
4 transactions
Insiders selling
4
5 transactions
Purchases
$209.6K
3,973 shares
Sales
$1.8M
40,110 shares
Net activity
-$1.6M
purchases less sales

How much of that selling was preplanned? 0% planned / 100% discretionary

10b5-1 plan sales $0 0 transactions · 0 shares
Discretionary sales $1.8M 5 transactions · 40,110 shares

Largest single sale: $1.2M.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: August 12, 2026 , by Macadam Stephen E. .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Swan Renee Chief People Officer Sell 3,870 $50.89 $197.0K 46,875 −7.6% of holding
Macadam Stephen E. Director Buy 2,000 $49.78 $99.6K 40,588
Disher Stephanie Chief Executive Officer Sell 25,652 $45.25 $1.2M 363,024 −6.6% of holding
Kienzler Jack Chief Financial Officer Sell 5,132 $45.25 $232.2K 75,804 −6.3% of holding
Masters Charles Senior Vice President Sell 2,890 $45.25 $130.8K 43,579 −6.2% of holding
Swan Renee Chief People Officer Sell 2,566 $45.25 $116.1K 50,745 −4.8% of holding
HAGGERTY GRETCHEN R 3 fills Director Buy 1,973 $55.74 $110.0K 25,741

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.