ESCO Technologies Inc (ESE) shares plummeted 9.25% in post-market trading on Thursday, as the market reacted to the company's second-quarter fiscal 2026 results.

The engineered products maker reported adjusted earnings per share of $1.91 for the quarter, surpassing the FactSet consensus estimate of $1.84. Revenue also exceeded expectations, coming in at $309.3 million against an estimated $307.9 million. The company raised its full-year adjusted EPS guidance to a range of $8.00 to $8.25 from the previous forecast of $7.90 to $8.15, while maintaining its revenue outlook.

Despite these positive indicators, the stock's sharp decline appears to be driven by valuation concerns. According to analyst data, the stock recently traded at 38 times the next 12-month earnings, a significant increase from a price-to-earnings ratio of 28 just three months ago. This elevated valuation likely led investors to conclude that the earnings beat and guidance raise were insufficient to justify the stock's premium price, triggering the post-market sell-off.