Atmus Filtration Technologies Inc. (ATMU) shares plummeted 8.30% in pre-market trading Friday following the release of its first-quarter 2026 financial results, which presented a mixed picture for investors.

The filtration solutions company reported adjusted earnings per share of $0.69, beating the Ibes estimate of $0.67, and revenue of $477.5 million, surpassing the $474.3 million estimate. However, the results were overshadowed by misses on key profitability metrics. Pretax profit came in at $61.2 million, below the $67 million estimate, and operating income was $76.3 million, missing the $80.8 million forecast.

For the full year 2026, Atmus reaffirmed its guidance, expecting adjusted earnings per share in the range of $2.75 to $3.00 on revenue between $1.945 billion and $2.015 billion. The maintained outlook, coupled with the quarterly profit shortfalls, appears to have driven the negative market reaction in the pre-market session.