Coherent released a near-perfect fiscal fourth-quarter 2026 report after Tuesday's market close, with revenue and profit both surpassing Wall Street estimates, while its fiscal first-quarter 2027 guidance also strongly exceeded expectations, signaling that AI optical interconnect demand remains far from its peak. However, this textbook earnings report led to approximately a 5% decline in after-hours trading, reflecting the core narrative of AI hardware investments: when a stock has already surged 205% in one year and gained another 8% before the report, the market no longer prices whether results are good, but whether they are good enough. In the earnings showdown between Coherent and Lumentum, Wall Street is recalibrating expectations for the AI infrastructure investment cycle with real money.
Record-Breaking Results
For the fourth quarter ended June 30, 2026, Coherent delivered a historic performance: revenue of $2.05 billion, up 34% year-over-year and approximately 3.5% above the $1.98 billion consensus estimate; adjusted earnings per share of $1.74, a 74% increase and 7% above the $1.62 analyst forecast; adjusted gross margin of 40.2%, improving 215 basis points year-over-year; adjusted operating margin of 21.8%, a significant 381 basis point expansion; and GAAP EPS of $1.19, a sharp improvement from a loss of $0.83 in the same period last year. For the full fiscal 2026, Coherent achieved revenue of $7.12 billion, a 28% increase on a pro forma basis, and non-GAAP EPS of $5.61, up 59% year-over-year.
AI Data Center Revenue Now 79% of Total
Coherent's quarterly performance was flawless. Revenue of $2.05 billion not only surpassed the $1.98 billion analyst estimate but also marked the company's first time exceeding the $2 billion threshold in a single quarter. Non-GAAP EPS of $1.74 exceeded estimates by $0.12. Non-GAAP gross margin expanded 215 basis points to 40.2%, and GAAP gross margin rose 277 basis points to 38.5%. The AI data center business has become the dominant driver. The Datacenter & Communications segment generated $1.62 billion in revenue, a 59% increase year-over-year, representing 79% of total company revenue. In contrast, industrial revenue declined 16% from $511 million to $431 million, highlighting the company's strategic shift toward AI infrastructure. CEO Jim Anderson stated, "Fiscal 2026 was a phenomenal year for Coherent, with record revenue, significant margin expansion, and non-GAAP EPS growth more than double the revenue growth rate." He added, "As AI data center architectures increasingly shift from copper to optical interconnects, we believe Coherent's broad photonics technology portfolio and manufacturing scale position us uniquely."
Guidance Crushes Estimates
Coherent's guidance for the fiscal first quarter of 2027 also comprehensively exceeded market expectations. The company projected revenue between $2.2 billion and $2.4 billion, with the midpoint of $2.3 billion coming in 8% above the $2.13 billion analyst consensus. Adjusted EPS is expected to be between $1.85 and $2.05, with the midpoint of $1.95 surpassing the $1.77 analyst estimate by 10%. In terms of capacity expansion, Coherent is aggressively advancing manufacturing upgrades. The company is on track to double its internal indium phosphide production capacity by the end of the year and plans to more than double it again by 2027. Coherent has signed a letter of intent for up to $50 million in funding under the CHIPS Act, in addition to receiving $20 million from the Texas Semiconductor Innovation Fund and the Sherman Economic Development Corporation. However, this crushing guidance triggered profit-taking. Before the earnings release, Coherent shares had already surged over 8% in regular trading, following Lumentum's strong performance. Over the past year, the stock has risen 205%. When all positive news is fully priced in, exceeding expectations alone is no longer enough to drive the stock higher.
Coherent vs. Lumentum: A Battle of Scale
In terms of size, Coherent holds the industry lead with quarterly revenue of $2.05 billion, roughly double that of Lumentum. However, in terms of growth, Lumentum's 109% revenue growth and 267% EPS growth are more aggressive. The common thread is that AI data center optical component demand is exploding at a rate far exceeding expectations.
Lumentum's Efficiency Milestone
Lumentum, which reported earnings on the same day, told a story of small but efficient growth. Fourth-quarter revenue reached $1.01 billion, up 109% year-over-year, marking the eighth consecutive quarter of revenue growth. Non-GAAP EPS was $3.23, a 267% increase. The most notable highlight was gross margin performance. Non-GAAP gross margin reached 50.4%, a significant 1,260 basis point improvement year-over-year. Crossing the 50% threshold marks a new level of pricing power and operating leverage in AI optical components. CEO Alan Lowe said on the earnings call that pump lasers are essentially sold out, despite the company rapidly expanding production. The company expects pump laser shipments to increase fourfold in the coming quarters. In the optical circuit switching segment, Lumentum shipments doubled sequentially, and it expects to achieve its first triple-digit quarterly OCS revenue in the fiscal first quarter of 2027.
The Harsh Math of Expectations
Coherent's 5% after-hours decline is not a rejection of its fundamentals but a mathematical correction of the tension between valuation and expectations. First, past gains have already priced in the future. The 205% rise over the past year means the market has front-loaded much of the AI optical interconnect narrative. After a further 8% gain before the report, any result that merely beats expectations cannot satisfy the sky-high bar set. Second, the industrial business remains a drag. While AI revenue grew 59%, the 16% decline in industrial business reminds the market that Coherent is not a pure AI play. As AI data center demand continues to surge, weakness in traditional industrial markets presents a structural challenge. Third, cash flow raises concerns. The report showed a significant decline in full-year operating cash flow. Amid aggressive capacity expansion, cash flow quality has become a new dimension for investors to scrutinize. The simultaneous earnings reports from Coherent and Lumentum paint a picture of AI optical interconnect demand exploding at an exponential rate. Both companies posted revenue growth of 34% and 109%, respectively, with expanding gross margins and guidance that fully exceeded expectations. These figures underscore the accelerating transition from the copper era to the optical interconnect era in AI data centers. However, Coherent's 5% after-hours decline also highlights the core contradiction in current AI hardware investment: when a stock has risen 205% in a year, even a perfect earnings report may lead the market to sell on the news. In the second phase of AI infrastructure investment, the market's focus is shifting from whether demand exists to whether valuations are reasonable.
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