ATMU Atmus Filtration Technologies Inc. Insider Trading

CEO Stephanie Disher sold 25,652 shares of ATMU at $45.25 for $1.2M; stock down 10.3% in 30 days, -25.9% over 90 days.

Stephanie Disher, Chief Executive Officer, sold 25,652 shares at $45.25 on 2026-06-01, reducing her holdings from 388,676 shares to 363,024 shares. The sale occurred against a backdrop of material recent weakness: the stock has declined 10.3% over 30 days and 25.9% over 90 days, trading 29.0% below its 52-week high of $66.50. While the company maintains solid fundamentals—$477.5M in quarterly revenue, $48.4M in net income, and a P/E of 18.31—the timing of the CEO's sale during a significant downtrend raises questions about near-term momentum and confidence in the current valuation relative to recent peaks. The transaction itself represents a meaningful but not exceptional reduction in her stake (6.6% of pre-transaction holdings), warranting monitoring of any follow-up filings to assess whether this signals a broader de-risking or shift in strategic positioning.

Director Gretchen Haggerty buys 4,592 shares (~$110K) across three open-market purchases; stock trading well below 52-week high amid recent decline.

Director Gretchen Haggerty executed three open-market purchases totaling nearly 4,600 shares on a single day while the stock trades well below its 52-week high and has declined over recent months. This is her fourth, fifth, and sixth open-market purchase at Atmus in the past three years, extending a consistent pattern of buying with no offsetting sales—she has never sold shares on the open market. Her previous purchase at this company saw the stock rise meaningfully afterward, establishing a track record of well-timed entry points. The current purchase comes as the stock remains depressed, offering her another opportunity to accumulate at lower prices, though the broader weakness over the past month suggests continued selling pressure from other market participants.