Celestica's stock experienced a significant decline of 8.10% during after-hours trading on Monday, moving against the positive sentiment from its recently released quarterly results.

The electronic manufacturing services company reported first-quarter adjusted earnings of $2.16 per share, surpassing analyst estimates, while revenue reached $4.05 billion, marking a substantial 53% year-over-year increase. Furthermore, Celestica raised its full-year 2026 outlook for both revenue and adjusted earnings per share.

The sharp decline is attributed to a "sell the news" reaction, where investors opted to take profits following the earnings release, despite the company's strong performance and upgraded annual forecast. This move occurred as the stock had seen positive momentum in the lead-up to the report.