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Twenty-four hours before Coherent Corp. posts its fiscal first-quarter results, the competitive landscape around it changed in a way that a single earnings report cannot fully price. On November 2, 2026, Marvell Technology and Lumentum announced a definitive agreement for Marvell to acquire Lumentum in an all-stock transaction, according to the companies’ announcement and related SEC filings. The deal carries an implied enterprise value of $115 billion for Lumentum, at a premium of approximately 23.9% to its unaffected closing price as of October 28, 2026, the last trading day before market speculation began. Coherent’s rival is now effectively spoken for, absorbed into a vertically integrated chip company with its own agenda.

That leaves Coherent as the only scaled, publicly traded independent supplier of the optical transceivers, lasers, and indium phosphide components that AI infrastructure runs on. That is not a minor footnote to Wednesday’s numbers. It is the thesis.

What Coherent Actually Sells

Coherent positions itself as a supplier of optical transceivers for datacenter and networking applications. As GPU clusters scale to hundreds of thousands of units, copper wiring hits physical limits on power and distance. Optical interconnects solve both problems, and Coherent makes the components, the lasers, and the transceivers that deliver those interconnects.

The optical networking buildout extends well beyond a single supplier. Ciena’s fiscal Q3 results showed cloud provider revenues jumping 82% year over year, confirming how broadly AI infrastructure spending is lifting the optical equipment sector.

Indium phosphide is a foundational technology for next-generation optical interconnects, and Coherent is one of the few companies manufacturing it at meaningful scale in the U.S. The company has said it is expanding indium phosphide capacity in Sherman, Texas, to address increased customer demand, supported in part by U.S. and Texas incentives and programs. That shortage matters: the bottleneck in the whole growth story is not whether customers will buy, but how many indium phosphide lasers can be made.

The Numbers Behind the Position

Revenue for Coherent’s fiscal fourth quarter of 2026 was $2.05 billion, and CEO Jim Anderson called fiscal 2026 an outstanding year, with record revenue and significant margin expansion, according to the company’s fiscal 2026 results release. The company reported full-year fiscal 2026 revenue of $7.1 billion. For the quarter now reporting, the company has guided fiscal Q1 revenue to a range of $2.2 billion to $2.4 billion, and management has discussed a longer-term goal of reaching $3 billion in quarterly revenue by fiscal year-end.

The strategic relationships are equally revealing. In March 2026, NVIDIA and Coherent announced a multiyear strategic agreement that includes an NVIDIA multibillion-dollar purchase commitment and future access rights for advanced laser and optical networking products, alongside a $2 billion NVIDIA investment in Coherent to support research, capacity, and U.S.-based manufacturing, according to NVIDIA’s announcement and Coherent’s filings. NVIDIA made a parallel $2 billion investment in Lumentum that same day, as reported by multiple outlets at the time. With Lumentum moving inside Marvell’s walls, that parallel no longer exists.

The Mogul Mindset

Charlie Munger spent decades looking for businesses that occupied a position competitors could not easily replicate. Coherent’s vertical integration across laser chips, indium phosphide wafers, and finished transceivers is precisely that kind of structure. Management has said it expects 1.6T module gross margins to be higher than 800G, helped by higher average selling prices early in the lifecycle, and aided by 6-inch indium phosphide cost advantages as the ramp progresses. A business that controls its own critical input, sells into a supply-constrained market, and earns higher margins as it does so is worth studying carefully.

Coherent has also described strong forward demand visibility on recent calls, including being booked out well into future calendar periods, which supports the view that output, not demand, is a near-term constraint.

What Could Go Wrong

The risks are real. Industry researchers have estimated that Chinese-headquartered suppliers account for roughly 60% of datacom optical component revenue, and any relaxation of trade tensions could flood the market with lower-cost supply. Potential U.S. restrictions targeting certain imported optical transceivers remain speculative, and while they could benefit a supplier with a stronger U.S. manufacturing footprint, analysts remain cautious. The indium phosphide ramp itself carries execution risk: yields on new 6-inch wafers must hold, and production limits on lasers can cap Coherent’s revenue directly. Valuation is not cheap, either. The market already knows about the AI demand wave.

The supply-constraint dynamic runs deeper than any single company’s capacity. Nvidia’s own gross margin compression from rising component costs reveals which upstream suppliers hold genuine pricing authority inside the AI hardware buildout.

The Long-Term Verdict

Coherent reports its quarter Wednesday afternoon. Whether management hits the high end of its $2.2 billion to $2.4 billion revenue guidance matters less than the structural change that happened the day before. The Marvell-Lumentum combination brings together Marvell’s electrical and optical interconnect capabilities with Lumentum’s expertise in high-performance lasers and optical circuit switching, according to the companies’ materials, creating a formidable captive supplier, but not an independent one. Coherent now holds a position its rivals cannot easily replicate: independence, scale, vertical integration in indium phosphide, and a locked-in strategic partner in NVIDIA. For a long-term owner, that configuration is what deserves attention, not any single quarter’s yield data.