Why Is COHERENT CORP (COHR) Stock Down Today?

COHR stock fell 12.75% to $306.43 on August 19, 2026, amid broader market weakness in AI and chip-related equities. The decline followed a recent rally driven by Coherent’s thermal innovation in silicon carbide substrates, which had drawn attention from both institutional and retail investors. However, rising bond yields and a shift in investor sentiment toward more defensive assets pressured the stock.

What Happened

Coherent announced that customers had begun sampling its new 300mm high-thermal-conductivity silicon carbide substrates, a development aimed at improving heat removal in AI chips. The company also reported record Q4 revenue of $2.05 billion, with Data Center revenue surging 66% and gross margin expanding to 40.2%. These results had fueled a recent rally, but the stock reversed course as broader market conditions deteriorated. Investors began selling chip and AI stocks, including Coherent, as bond yields climbed and concerns over valuations resurfaced. The stock’s sharp pullback came after it had reached a 52-week high earlier in the year.

What The Data Shows

COHR has a market cap of $65.4 billion and trades at a P/E ratio of 75.1, reflecting its high-growth profile. The stock has traded between $84.35 and $440.00 over the past 52 weeks. On August 19, it printed one of 37 fresh 52-week lows. Recent insider activity includes a $307,000 sale by CFO Sherri Luther on July 22. Congressional trades show Rep. Ro Khanna sold between $1,001 and $15,000 on July 20, following a similar purchase on June 30. Social chatter on platforms like Stocktwits has remained relatively muted in the past 24 hours.

What To Watch

The stock is not scheduled to report earnings in the near term. Investors should monitor coverage breadth and sentiment shifts as the broader market reacts to macroeconomic developments and bond yield trends.