Lumentum posted a blockbuster third fiscal quarter, with revenue vaulting 90% year-on-year to $808.4 million and adjusted earnings per share of $2.37 handily beating estimates. But instead of celebrating, investors sent the stock down more than 7% on Tuesday. The disconnect between operating strength and market reaction highlights the growing tension between Lumentum’s enviable position in the AI infrastructure buildout and the very real operational hurdles that lie ahead.
The company’s optical components and systems are central to the data-centre upgrade cycle, as hyperscalers shift from copper to fibre interconnects to manage the power and cooling demands of AI clusters. The component business surged 77% in the quarter, while the systems segment – which includes cloud transceivers – jumped 121%. Gross margin improved to a solid 47.9%. Yet the market fixated on what comes next: can Lumentum scale fast enough to meet orders that are already piling up.
The backlog for optical switches alone now exceeds $400 million, and management is targeting $1 billion in revenue from that segment by 2027. A key reason for such ambition is the strategic vote of confidence from Nvidia, which has invested $2 billion in Lumentum. The chip giant’s backing underscores the importance of Lumentum’s optical circuit switching (OCS) and co-packaged optics (CPO) in preventing data bottlenecks inside large AI clusters. CEO Alan Lowe has staked the company’s future on these technologies, and the order books are filling fast.
Should investors sell immediately? Or is it worth buying Lumentum?
For the current fourth quarter, Lumentum forecasts revenue around $985 million and adjusted EPS of as much as $3.05. Longer term, a new manufacturing facility in Greensboro is expected to generate an additional $5 billion in revenue by 2028. The company’s Michael Hurlston described the plant as the foundation for a significant expansion of market share. Meanwhile, Lumentum has also set a net-zero emissions target for 2030, a goal that resonates with the large cloud providers that are its biggest customers.
The stock’s slide on Tuesday – to €723.60 – hardly tells the full story. The shares have still nearly quadrupled over the past twelve months, gaining roughly 120% year-to-date and more than 900% over the past year. At a price-to-earnings ratio of about 163, however, the valuation leaves little room for error. Risks include potential export controls on semiconductor and optical hardware, as well as the challenge of scaling CPO production to keep pace with blistering demand.
Investors are essentially betting that Lumentum can execute flawlessly on its manufacturing ramp while maintaining margins. The next hard data points will come with the fourth-quarter report, which will show whether the company can turn its billion-dollar backlog into a sustainable earnings stream. For now, the AI optics boom is real – but so are the growing pains.
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