Why is OSI Systems stock sliding today?

OSI Systems' stock plummeted 10.6% in after-hours trading following the release of its fiscal fourth-quarter and full-year 2026 financial results. The company reported Q4 non-GAAP earnings per share of $3.78, a 17% increase year-over-year, which met the Wall Street consensus of $3.76. However, full-year fiscal 2026 revenues hit $1.79 billion, and OSI Systems provided its fiscal 2027 revenue and non-GAAP EPS guidance for the first time.

The market reaction appeared to be driven by disappointment in the forward outlook, as the stock had previously reached a 52-week high of $311.72. The decline also reflected a broader trend of margin concerns that had been apparent since the Q3 FY2026 report in May, when operating margins fell year-over-year. OSI Systems' CEO, Ajay Mehra, attributed revenue headwinds to conflicts in the Middle East, which impacted the timing of certain deliveries.

Despite positive developments such as the expansion of its share repurchase authorization and a new $85 million contract from U.S. Customs and Border Protection, these were not enough to offset investor concerns. The broader market provided little support, with the S&P 500, Dow Jones, and Nasdaq all showing minimal gains or flat performances.

OSI Systems' stock is now hovering near its 52-week low of $197.27, having lost approximately 37% of its value since April 2026. The company's performance, coupled with persistent margin concerns and geopolitical risks related to revenue timing, contributed to the sharp drop in the stock price following the earnings release.