Entegris Inc. (ENTG) shares plummeted 5.22% during intraday trading on Thursday, marking a significant decline for the semiconductor materials supplier.

The drop followed the company's release of its first-quarter 2026 results, which showed net sales of $811.9 million, a 5% year-over-year increase that slightly beat analyst estimates. The company reported GAAP diluted earnings per share (EPS) of $0.60 for the quarter.

However, investor sentiment appeared to be weighed down by the company's guidance for the second quarter. Entegris expects GAAP diluted EPS in the range of $0.53 to $0.61, which suggests potential stagnation or a slight decline compared to the Q1 figure of $0.60. This outlook may have disappointed the market, especially as the stock recently traded at a high valuation of 40 times next 12-month earnings.

Management noted that the semiconductor market continues to improve, driven by accelerating AI-related demand, and that its product portfolio is well-positioned. Despite this positive commentary, the immediate financial guidance appears to have triggered the sell-off during the trading session.