On August 12, 2026, Coherent Corp. (NYSE:COHR) beat fourth-quarter earnings estimates and forecast first-quarter revenue and profit above expectations. Yet, its shares slipped 4% in extended trading.
Lumentum Holdings Inc. (NASDAQ:LITE), a rival optical component maker, reported its results a day earlier, on August 11, 2026, with revenue guidance that CEO Michael Hurlston said would hit the company’s long-term target model a full quarter ahead of schedule.
Why This Matters
Both companies make the optical components that move data inside AI data centers, and both are seeing real demand from the same hyperscaler buildout.
That raises the real question: if the demand story is this strong for both, why did the market reward one stock and sell the other?
The Bull and Bear Case: Coherent
Coherent Corp. (NYSE:COHR)’s data center and communications segment, its largest, generated $1.62 billion in revenue, up from $1.02 billion a year earlier. Overall quarterly revenue of $2.05 billion beat the $1.99 billion analysts expected. CEO Jim Anderson said the company enters fiscal 2027 “with exceptional customer demand, expanding production capacity.” Coherent forecasts first-quarter revenue of $2.2 billion to $2.4 billion, above the $2.14 billion analysts modeled. Nvidia itself invested $2 billion in Coherent in March 2026 to support research, manufacturing, and operations.
However, revenue in Coherent Corp. (NYSE:COHR)’s industrial business segment fell 16% during the quarter. The company reported sharply lower full-year operating cash flow. Shares had already climbed nearly 93% for the year heading into the report, leaving little room for anything short of a clean beat, and the stock fell anyway despite one.
The Bull and Bear Case: Lumentum
Lumentum Holdings Inc. (NASDAQ:LITE)’s press release said the company’s trajectory “continues to accelerate as AI demand drives” its first-quarter revenue guidance midpoint to $1.25 billion, reaching its target model a quarter ahead of schedule. Non-GAAP net income for the fourth quarter came in at $326.3 million, or $3.23 per diluted share, up sharply from $63.3 million a year earlier, and the company guided first-quarter non-GAAP earnings per share of $4.05 to $4.35.
Lumentum Holdings Inc. (NASDAQ:LITE) reported a GAAP net loss of $7.2 billion for the quarter, driven almost entirely by a one-time $7.8 billion non-cash loss tied to converting some of its convertible notes into equity, a reminder that the company’s balance sheet still carries complexity investors need to look past to see the underlying business.
Insider Monkey’s Hedge Fund Data
Coherent Corp. (NYSE:COHR) was held by 114 hedge funds as of Q1 2026, up from 109. Lumentum Holdings Inc. (NASDAQ:LITE) was held by 123 hedge funds, up from 97.
Conclusion
Coherent and Lumentum are both genuinely benefiting from the same AI optics boom, but Coherent’s post-earnings drop shows how little room for error even a strong quarter leaves once a stock has already run this far.
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Disclosure: None. This article is originally published at Insider Monkey.
