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

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Stock End-of-Day Report

As of Jun 23, 2026, 4:00 PM ET

For informational purposes only.

Summary

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.

2) Broad tech and AI selloff
It’s not just optics. The Nasdaq dropped over 2%, semiconductor stocks were down close to 7% from recent highs, and there’s been a wave of “cheap bets” against chip names. Coherent sits in the middle of this: it’s a high-growth, AI-infrastructure play with a very volatile stock. When the sector gets hit, it tends to move more than the average tech stock.

3) AI spending and interest-rate worries in the background
Recent reports point out that big companies funding the AI buildout are piling on debt, and markets are getting nervous about how much is being spent. Higher-for-longer interest rates also make future profits less valuable in today’s money.

For a company like Coherent, which carries about $3.4B of debt but is working it down, that matters. The good news is: it has solid revenue growth, improved margins, and plenty of liquidity. The worrying part is: if AI customers ever slow spending, the market could get more jumpy about that debt.

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.

What didn’t change today

None of today’s news said Coherent lost customers, blew up its balance sheet, or had a product problem. In fact, recent commentary has been highlighting positives: a record order backlog (a “to-do list” of booked business), long-term customer commitments, NVIDIA owning a stake, and improving profitability.

So the core business story looks similar to last week. What changed was how much investors are willing to pay for that story right now.

So what does this mean for you?

If you care about the short term, today’s move is a reminder that this is a high-volatility stock. A beta around 3 means it can move roughly three times as much as the broader market, both up and down. Big swings are part of the package.

If you’re thinking longer term, the key questions aren’t answered by today’s drop:

Do AI data center orders keep growing and show up as higher networking revenue and margins?
Does Coherent clearly bring its debt down over the next couple of years?
Do customers keep signing multi-year deals, or do AI spending headlines turn into real order cuts?

Things that would make the setup look better: the stock stabilizing instead of sliding day after day, updates showing backlog turning into cash, and clear progress on debt reduction.
Things that would make it look worse: more big down days on company-specific bad news, signs that major AI customers are cutting or delaying networking spend, or any setback on the regulatory/geopolitical front.

For now, today looks less like “Coherent broke” and more like “the market hit the brakes on how excited it is about AI optics, all at once.”