Why Is COHERENT CORP (COHR) Stock Down Today?

Coherent Corp (COHR) shares fell 12.44% to close at $207.70. The primary driver was a sector-wide rotation in optical component stocks following reports that Marvell Technology is in acquisition talks for Lumentum. While Lumentum shares surged, Coherent traded lower as investors reassessed valuation multiples across the peer group.

What Happened

Reports emerged that Marvell Technology is moving to acquire Lumentum to secure scarce optical components for AI data centers. This development triggered a sharp divergence in the sector, with Lumentum shares jumping 17% on the takeover talk. In contrast, Coherent shares declined significantly, reflecting a relative valuation adjustment. B. Riley Securities maintained a Neutral rating on Coherent but lowered its price target to $262. The stock had previously traded in a wide 52-week range of $123.75 to $440.00.

What The Data Shows

The stock opened at $216.37, representing an 8.8% gap down from the prior close of $237.22. The session high was $237.22 at 8:45 AM ET, while the low reached $207.00 at 10:25 AM ET. Volume stood at 3.0 million shares, which is 0.5x the 3-month daily average. Fundamentals show a market cap of $47.2 billion and a P/E ratio of 57.6. Revenue grew 22.5% over the trailing twelve months, and the net margin is 11.3%. The stock carries a beta of 2.11. Recent insider activity includes eight sells totaling $9.1 million in the last 90 days, with no buys. Congressional trades show five sells and two buys in the same period.

What To Watch

Investors will monitor the progress of the reported Marvell and Lumentum acquisition talks and how the sector consolidates. The recent 52-week tape printed six fresh highs and 15 fresh lows on October 30, 2026, indicating high volatility. Coverage breadth from three sources in the last 36 hours suggests continued focus on the optical sector dynamics.