Coherent Corp. (COHR) closed Thursday at $263.17, down 9.27% on the session, as selling pressure continued to weigh on the optical and laser components maker. The decline contributed to a steep seven-day loss of 21.34%, one of the more severe short-term drawdowns the stock has experienced.
Despite the turbulence over the past week, the 30-day picture tells a more measured story. Over that broader window, shares are off just 1.25%, suggesting the bulk of the recent damage has been concentrated in a very short period of time.
The company's market capitalization stood at $57.11 billion as of the close, reflecting the cumulative impact of the week's losses on Coherent's overall valuation.
The sharp week-over-week move places COHR among the notable decliners in the technology sector for the period ending October 15, 2026, though the relatively contained 30-day figure may draw attention from observers tracking the stock's longer-term trajectory.
