Shares of Donaldson (DCI) dropped 5.86% in pre-market trading on Thursday, after the company reported disappointing fiscal second-quarter results and lowered its full-year guidance.

Donaldson, a leading manufacturer of filtration systems, reported fiscal Q2 2025 earnings of $0.83 per share, missing analyst estimates of $0.85 per share. The company's revenue for the quarter came in at $870 million, falling short of the consensus estimate of $908.3 million.

In addition to the weaker-than-expected quarterly performance, Donaldson revised its full-year fiscal 2025 outlook. The company now expects adjusted earnings per share in the range of $3.60 to $3.68, down from its previous guidance of $3.56 to $3.72. Donaldson also lowered its revenue growth forecast for fiscal 2025, projecting flat to up to 4% growth, compared to the earlier guidance of 2% to 6% growth.