Coherent, Inc.

381.42

-10.36%

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IPGP

AAOI

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Both companies sell optical communications products for data centers and telecom networks, and both also sell laser-related products for industrial uses. They are competing for the same network builders and factory customers that need faster, more efficient light-based hardware.

Coherent drops 10% as investors hit the brakes on AI optics valuations

As of Jun 23, 2026

For informational purposes only.

Summary

Coherent fell about 10% today in a broad selloff of optics and AI-related tech stocks, driven less by company-specific bad news and more by investors rethinking how much they’re willing to pay for “AI plumbing” names after a big run-up. The move came with only average-ish trading volume and followed a sector-wide hit to semiconductor and AI shares as the market worries about lofty expectations, heavy AI spending, and higher-for-longer interest rates. Recent positives—like Coherent’s record backlog, NVIDIA’s stake, and improving margins—did not change today, but the stock’s high volatility and meaningful debt load make it especially sensitive when sentiment toward AI infrastructure cools. For a watcher or holder, the key from here is whether the stock stabilizes as orders and cash flow back up the AI growth story, or whether further signs of AI spending fatigue or company-specific setbacks push the valuation reset even further.

Today was a punch-in-the-gut kind of day for Coherent: the stock dropped about 10%, but not because the company announced some disaster. This was mainly the market rethinking how much it wants to pay for “AI plumbing” stocks like this, all at once.

What actually happened today

Coherent closed around $381, down roughly 10% in one session. It traded near $399 at the high and slid to about $380 by the close, so sellers were in control most of the day. Volume was slightly below its recent average, which makes this look more like a broad reset in price rather than a full-on panic stampede.

Even after this drop, the stock is still up more than 50% over the last couple of months, so part of today is simply giving back some very fast recent gains.

Why it moved: the 3 big forces

1) Optics/AI “valuation reset” (main driver)
News today focused on a sharp selloff in optical and photonics companies as a group. Coherent, Applied Optoelectronics, and Lumentum all fell hard, with headlines talking about a possible “valuation reckoning.”

Translated: investors are asking, “Did we get too excited and pay too much for these AI-related hardware names?” When expectations and prices run hot, even good stories can get knocked down when the crowd suddenly wants to pay less for the same earnings.