Shares of high-flying photonics names are sliding at midday Thursday. Applied Optoelectronics (NASDAQ:AAOI) stock is down 17% to $114.93, the biggest decliner in the group and easily the sharpest single-session drop of the three. Coherent (NYSE:COHR | COHR Price Prediction) stock is off 10% to $331.57, while Lumentum (NASDAQ:LITE) stock is down 10% to $720.91.
The moves interrupt some of the best runs anywhere in tech this year. Applied Optoelectronics stock is up 233% year to date (YTD), Lumentum stock is up 98% YTD, and Coherent stock is up 80% YTD. Even after today’s selling, all three remain massive 2026 winners tied to the AI optical-networking build-out, and that kind of vertical price action carries built-in vulnerability to a single risk-off session.
Our news feed shows no stock-specific catalyst behind the drop in Applied Optoelectronics, Coherent, or Lumentum. The action reads as a valuation-driven, sector-wide reset in high-beta AI-infrastructure names, with the underlying businesses still intact.
The Valuation Reset After a Blistering Rally
The setup for a fast unwind was already in place across Applied Optoelectronics, Coherent, and Lumentum. Per Yahoo Finance, Coherent stock trades at a P/E ratio of 158.42x and Lumentum stock at a P/E ratio of 128.05x. Applied Optoelectronics carries no P/E because the company is unprofitable, with a trailing EPS of -$0.65.
Today’s sell-off fits the broader AI-hardware pullback pressuring other high-flyers. NVIDIA (NASDAQ:NVDA) stock was down 2% midday Thursday, and Intel (NASDAQ:INTC) stock was down 6%. Inverse semiconductor ETFs jumped sharply, a tell that positioning turned defensive across the chip and networking complex heading into July.
The Business Case Under the Sell-Off
The fundamentals under the drop in Applied Optoelectronics, Coherent, and Lumentum haven’t cracked. Coherent’s fiscal Q3 2026 revenue rose 21% year over year (YoY) to $1.8 billion, with datacenter and communications revenue jumping 41% YoY as the company deepened its NVIDIA optical-networking partnership. Coherent’s average analyst price target of $384 sits well above the current level, with 12 Buy and 4 Strong Buy ratings against 4 Holds.
Lumentum’s Q3 FY2026 revenue jumped 90% YoY to $808 million, and management guided Q4 revenue to a range of $960 million to $1.01 billion. Lumentum also disclosed a co-packaged optics order for H1 CY27 delivery and an optical-circuit-switch backlog above $400 million, signaling continued design-in traction with hyperscale AI customers.
Applied Optoelectronics is smaller but scaling fast, with datacenter revenue more than doubling YoY in Q1 FY2026 on 800G transceiver demand tied to a large hyperscale customer. CEO Thompson Lin has previously guided full-year 2026 revenue to potentially exceed $1 billion. That growth story is exactly why the stock rallied so hard in the first place.
Bulls and Bears Split on the Optical Trade
The community around Applied Optoelectronics, Coherent, and Lumentum is split after today’s drop. One camp treats the pullback as a tactical entry into a multi-year optical and AI-scaling cycle, citing hyperscaler capex on 800G and 1.6T transceivers, co-packaged optics, and optical circuit switches. The other camp flags stretched multiples and points to recent insider sales as a caution signal.
There’s also insider selling to consider. Executive dispositions at Applied Optoelectronics, Coherent, and Lumentum in May and June appear consistent with pre-scheduled Rule 10b5-1 plans and equity-compensation timing, not directional calls on the businesses. Shareholders watching their exposure to photonics should think about keeping their position sizes modest, given how quickly these high-beta names can move in either direction.
What to Watch Now
Traders can watch for whether Applied Optoelectronics stock holds the $115 area and whether Coherent stock and Lumentum stock stabilize into the afternoon. A bounce off of session lows would signal dip-buyers stepping in, while a slide into the close would keep the sector-reset thesis alive for tomorrow’s open.
The next catalyst path is calendar-driven. Coherent and Lumentum will report their fiscal Q4 2026 results later this summer, and hyperscaler capex commentary from mega-cap tech earnings arrives within weeks. Investors weighing their photonics allocation may want to track how AAOI, COHR, and LITE shares trade against the broader semiconductor group over the next several sessions before making any position changes.
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