Coherent Corp. (COHR) fell 4.79% on Tuesday, August 25, 2026, closing at $275.51 as selling pressure continued to weigh on the optical and photonics components maker. The single-session decline added to a difficult stretch for the stock.
Over the trailing seven days, COHR has lost 11.05%, a notable pullback for a company carrying a market capitalization of $56.7 billion. The weekly drop reflects a meaningful erosion of shareholder value in a short window of time.
Zooming out to the 30-day horizon, the stock is down 2.50%, suggesting the steepest portion of the decline has been concentrated in the most recent week rather than spread evenly across the month.
Coherent Corp. manufactures compound semiconductors, lasers, and optical networking components used in data centers and communications infrastructure. Tuesday's close at $275.51 leaves the stock well below where it stood a week ago.
