Coherent: The sweetest trouble in optical communications—orders scheduled through 2028, stock price drops first out of caution

① **Record revenue of $1.81 billion, with growth accelerating:** Year-over-year growth of 21% (+27% on a pro forma basis), quarter-over-quarter growth of 7%. More importantly, Q4 guidance midpoint is $1.98 billion (+10% QoQ), and management has clearly stated that FY2027 growth rate will exceed FY2026—even with the revenue base already doubled. ② **6-inch indium phosphide wafer capacity doubling met one quarter ahead of schedule:** The InP capacity doubling target originally planned for year-end will be achieved early next quarter (June). By the end of 2027, it will double again—a fourfold capacity increase in two years. 6-inch yield has exceeded the 3-inch line, costs are less than half those of 3-inch wafers, and the number of chips produced per wafer is over four times that of 3-inch—this is the core engine for sustained margin expansion. ③ **NVIDIA’s $2 billion strategic investment + multi-year CPO supply agreement through decade’s end:** Covers high-power CW lasers, external laser source modules (ELS), fiber array units (FAU), and the full suite of CPO components. Scale-out CPO revenue begins H2 2026; scale-up CPO starts H2 2027. The addressable CPO market exceeds $15 billion. ④ **Datacenter and communications revenue 75% of total, over 40% YoY growth:** Datacenter subsegment grew 37% YoY and 13% QoQ—double-digit QoQ growth for two consecutive quarters; Communications grew 60% YoY and 16% QoQ, with accelerated growth as DCI and scale-across demand remains strong. ⑤ **OCS market opportunity doubled to $4 billion+, production bottlenecks resolved:** Internal key component capacity bottlenecks were solved in the past two months, with two factories ramping up simultaneously. Multi-Rail systems (addressable market over $2 billion) will begin contributing revenue in H1 2027. ⑥ **Debt leverage down from 2.1x to 0.5x, balance sheet transformed:** NVIDIA’s $2 billion equity investment plus $162 million in debt repayment drove net leverage from 2.1x a year ago down to 0.5x. However, operating cash flow for 9 months is only $10 million—inventory grew from $1.4 billion to $2.1 billion, receivables from $1 billion to $1.2 billion, with a large amount of cash absorbed by working capital. To understand this financial report, we must first look at Coherent’s transformation in the past three years. After completing the II-VI acquisition in 2022 (about $7 billion deal), the company bore heavy debt—net leverage once exceeded 3x. In FY2024 and the first half of FY2025, the market priced Coherent mainly based on the “deleveraging story": moderate revenue growth, high integration costs, and industrial segment dragging down margins. The turning point came in the second half of FY2025, when the AI datacenter’s demand explosion for high-speed optical transceivers sent datacenter & communications segment into an accelerated growth trajectory, while 6-inch InP mass production and NVIDIA’s $2 billion strategic investment fundamentally reshaped the balance sheet. In short: Coherent took two years to shift from “post-acquisition digestion” to “AI-driven scale expansion.” The most notable point in this financial report isn’t the record revenue itself, but a counter-intuitive signal: the growth rate is still accelerating even as the revenue base has already doubled. Q3 pro forma revenue grew 27% YoY, Q4 guidance midpoint implies over 30% YoY growth, and management said FY2027 growth will exceed FY2026. The logic: 6-inch InP capacity is moving from “engineering validation” to “mass production," and InP supply shortage has been the core bottleneck restraining Coherent’s revenue growth in the past two years. Wall Street’s reaction suggests that for a stock up more than 400% over the past year, “good” isn’t enough—it must be “unexpectedly good.” Q3 Non-GAAP EPS was $1.41, $0.02 below consensus ($1.43); revenue was $1.806 billion, just under $10 million below the forecast. This is a miss of less than 1%—but still drove the stock down 6.7% after the report. Lumentum, reporting in the same week, saw similar treatment—EPS beat by $0.10, but shares fell 5.6%. For a stock up 1,444% in a year, even a beat can’t stop profit-taking. The investment bank response is more rational: Stifel raised Coherent’s price target from $275 to $412 and maintained a “buy" rating; among 27 analysts, 17 rate buy, 5 hold, and 0 sell. Compared to Lumentum’s contemporaneous report (revenue $808 million, +90% YoY, Non-GAAP margin 47.9%), Coherent’s scale is 2.2x Lumentum’s, but its gross margin is 8 points lower (39.6% vs 47.9%), and operating margin is 12 points lower (20.3% vs 32.2%). The gap is due to three factors: Coherent’s industrial segment (25% of revenue) pulls down blended margin; Coherent does more system integration and modules—which have higher integration but inherently lower margins; and II-VI acquisition integration costs still being digested. But the 6-inch InP cost advantage is narrowing this gap—gross margin has expanded 530 basis points over the past 8 quarters, and II-VI’s materials science capabilities are now finding new AI-era applications (later discussed: Thermadite thermal materials and thermoelectric generators). --- **Detailed Financial Analysis** **Q3 Summary** Coherent’s third fiscal quarter (ended March 31, 2026) revenue was $1.806 billion, +21% YoY, +7% QoQ. After removing divested Aerospace/Defense and Munich products, pro forma YoY was +27%, QoQ +9%. GAAP gross margin was 37.7% (+243 bps YoY), GAAP operating margin 11.1% (+633 bps YoY), GAAP net profit $191 million, EPS $0.97. Non-GAAP gross margin 39.6% (+105 bps YoY, +57 bps QoQ), operating margin 20.3% (+163 bps YoY), EPS $1.41 (+55% YoY). GAAP and Non-GAAP differences mainly stem from restructuring costs ($34.4 million), intangible amortization, and equity compensation. Q3 also had $8.9 million from business divestitures (Munich unit), a one-off item. --- **Datacenter & Communications: 75% of Revenue, 100% of Growth** Datacenter and communications revenue $1.362 billion, +40.6% YoY, +12.7% QoQ, making up 75.4% of total revenue—the absolute core of Coherent’s growth. Datacenter subsegment grew +37% YoY, +13% QoQ, with double-digit QoQ growth two quarters in a row. Growth was driven by optical transceivers (800G and 1.6T) and OCS systems. 1.6T ramped up faster than management expected one year ago, and 1.6T margins are higher than 800G—a typical feature of the early stages of speed upgrades. 800G will still grow YoY in 2026 calendar year, with 1.6T adding incremental growth. Communications subsegment was the surprise of the quarter—+60% YoY, +16% QoQ, with notable acceleration. DCI (datacenter interconnect), scale-across (cross-datacenter interconnect), and traditional telecom all displayed strong demand. Management particularly highlighted the growth of scale-across, which covers pump lasers, ZR/ZR+ transceivers, line cards, and amplifiers across all product categories and has wide customer LTA coverage and high visibility. More noteworthy are two new growth vectors: OCS (Optical Circuit Switch): Management raised the market opportunity estimate to over $4 billion (previously ~$2 billion). Internal key component capacity bottlenecks were “dramatically” resolved in the past two months, with two factories ramping up in parallel. Significant QoQ growth is expected in Q4. OCS extends Coherent’s role from an optics component supplier to a higher-value layer in AI network infrastructure. Multi-Rail system: A new solution dramatically boosting bandwidth in the same power and physical footprint. Addressable market above $2 billion, with differentiated component technology; revenue contribution planned from H1 2027, with higher margin structure than company average. --- **6-inch InP: Coherent’s Biggest Structural Advantage** 6-inch InP wafers are the technological mainline of this report. Key facts: Capacity timeline pulled forward: The InP capacity doubling originally planned for end of 2026 will be achieved one quarter early in June. Doubled again by end of 2027—a fourfold capacity growth in two years. Yields exceeded expectations: 3 device types (EML, CW lasers, photodetectors) have higher yields on 6-inch than on the 3-inch lines. So, 6-inch means not only lower cost but also better quality. Cost structure advantage: 6-inch wafers yield over 4x the devices of 3-inch at less than half the cost—this is a one-off structural cost advantage. Once capacity transition completes, margin permanently improves. Three production sites: Sherman, Texas (first 6-inch site, world’s most advanced InP facility); Sweden site (6-inch production started); Zurich (third site, starting 2027). Q3 saw first shipments of optical transceivers containing 6-inch devices, contributing to QoQ revenue growth and margin improvement. But management stresses “the real benefits of 6-inch lie ahead”—currently, 6-inch is only part of InP capacity, but from next quarter it will be half, and its ratio will continue rising. CEO Jim Anderson further explained the lag from capacity to revenue: InP devices take 2-3 months from wafer fab to module shipment, so the ramping 6-inch capacity will be reflected in Q4 and FY2027 Q1 revenues. --- **CPO: Over $15 Billion Incremental Market, NVIDIA Partnership Only the Start** CPO (Co-Packaged Optics) is a long-term growth narrative for Coherent. Management describes CPO as “one of the most important long-term growth opportunities.” NVIDIA strategic partnership announced in March includes: $2 billion equity investment; multi-year supply agreement through decade’s end; spans multiple CPO-related products/solutions. Crucially, Coherent’s CPO content is not just lasers—but also ELS modules, isolators, thermoelectric coolers, FAUs, microlens arrays, polarization-maintaining fibers, and more—a full suite. Management emphasizes “not depending on external suppliers for these key optical components” as a major customer advantage. Timeline: Scale-out CPO revenue starts in H2 2026; scale-up in H2 2027. Aside from NVIDIA, multiple other customers have broad CPO/MPO projects ongoing. --- **Industrial Segment: Short-term Weakness, II-VI Materials Tech Finding Second Life in AI Scenarios** Industrial segment revenue $444 million, -16% YoY (includes divestiture impacts), -7% QoQ. Conventional industrial markets remain weak, but semiconductor capex orders are noticeably improving, expected to contribute revenue growth starting Q4. The real story here is II-VI’s materials science capability, acquired years ago, now finding new applications in AI datacenters. Two product lines to watch: Thermadite thermal management: A proprietary Coherent material, with thermal conductivity 2–5x copper. When applied to GPU/XPU cooling, lets chips run at higher frequencies/utilization—CEO Jim Anderson notes, “you get more tokens from the same GPU.” Strategic customer validation ongoing, revenue expected from H2 2027. Thermoelectric generators (TEG): Converts waste heat from GPUs back into electricity for datacenter efficiency. Also expected to start revenue in H2 2027. Both product lines have the same logic: materials technology obtained in the II-VI acquisition is now finding higher-margin, faster-growth use cases in the AI era than in traditional industrial markets. This cross-segment technical synergy is a source of differentiation pure optical comms companies (like Lumentum) can’t replicate. --- **Financial Quality: Steady Margin Expansion, but Cash Consumption by Working Capital Is a “Hidden Concern”** Non-GAAP gross margin at 39.6%, expanded by 530bps over 8 quarters, still about 240bps from the 42% target set at Investor Day. Management’s three main drivers—cost reduction (6-inch InP), yield improvement, pricing optimization—all improved notably QoQ. Q4 guidance midpoint for margin is 40%, continuing QoQ improvement. Non-GAAP operating margin at 20.3%, SG&A rate down from 10.4% last year to 9.4%, reflecting efficiency gains from shared services and ERP integration in low-cost regions. R&D rate up to 9.9% YoY, mainly invested in transceivers, CPO, OCS, and Multi-Rail roadmap—management calls this “highest return investment.” Non-GAAP EPS $1.41, +55% YoY, profit growth outpacing revenue. This is why, even though EPS missed by only $0.02, investment banks collectively raised price targets—they see accelerating profitability from expanding margins, not worry about a minor quarterly miss. But operating cash flow is a possible explanation for the stock’s 6.7% drop after the report: 9-month opex cash flow only $10 million (vs $503 million a year ago). Main reason is inventory up from $1.44 billion to $2.13 billion (+48%), receivables up from $960 million to $1.19 billion (+23%). The inventory increase mirrors ramping InP wafer capacity and module stocking, which is normal during rapid growth—but for some investors, a company doubling profits but only generating $10 million in opex cash flow in 9 months feels uncomfortable. This figure needs to improve over the next 2–3 quarters, or it will be ammunition for short sellers. Capital expenditure: Q3 was $290 million (vs $112 million prior-year); 9-month total $547 million. Management expects capex to continue QoQ increase in Q4—early investments in LTA with clients partially offset the spending. Long-term debt stands at $3.18 billion, down $310 million since start of year; combined with NVIDIA’s $2 billion equity investment, net leverage plummeted from 2.1x to 0.5x. The biggest risk two years ago—debt burden—has basically been eliminated. --- **Competitive Landscape vs Lumentum: Same Track, Different Approach** Coherent and Lumentum released reports almost concurrently, and both stocks experienced “good results, stock pullback” the same week. But their positioning in the AI optical communications track is worth scrutiny: Revenue scale: Coherent’s $1.81 billion is 2.2x Lumentum’s $810 million, but Coherent’s industrial segment ($440 million) and traditional comms further widen the gap. Focusing solely on AI datacenter-related revenue narrows it. Growth differences: Lumentum’s +90% YoY far exceeds Coherent’s +21% (pro forma +27%), but this is partly because Lumentum had a lower base last year ($425 million vs Coherent’s $1.5 billion). Their QoQ growth is more comparable—Lumentum +21.5%, Coherent +7.1%. Margin structure: Lumentum’s Non-GAAP gross margin of 47.9% is much higher than Coherent’s 39.6%, and operating margin gap is even wider (32.2% vs 20.3%). Lumentum focuses on high-margin laser chips/components; Coherent does more system integration and modules, with inherently lower margins, plus industrial segment drag. 6-inch InP competition: Coherent is the leader in 6-inch InP, with three sites ramping in parallel and modules containing 6-inch devices already shipping. Lumentum is also boosting InP capacity investment but relies more on vertical integration (e.g., internal CW laser supply) to lift margin. NVIDIA collaboration: Both secured ~$2 billion NVIDIA equity investments and multi-year supply agreements, reflecting NVIDIA’s dual-source strategy for the CPO supply chain. Market response: Both saw similar after-hours stock drops—Lumentum beat EPS by $0.10 but fell 5.6%, Coherent missed by $0.02 and dropped 6.7%. But investment banks responded differently: Lumentum saw aggressive target upgrades (Loop Capital to $1,400, Rosenblatt to $1,300), Coherent’s upgrades were more moderate. This reflects higher tolerance for “pure laser chip growth story” (Lumentum) valuations than “diversified photonics platform” (Coherent). Common signals: Both report severe InP capacity shortages, order visibility into 2028, and LTA coverage through decade’s end. TrendForce estimates 2026 AI optical module market at $26 billion (+57% YoY), and EML/CW laser supply constraints are seen as the main bottleneck for industry capacity expansion. This confirms the AI optical comms supply-demand gap is structural, not specific to any one company. --- **Outlook: Three Main Lines Determine Medium-term Direction** **The speed at which 6-inch InP capacity converts into revenue.** Capacity doubling being reached early is positive, but modules lag devices by 2–3 months. The key indicator is FY2027 Q1 (July–September) QoQ revenue growth—if 6-inch capacity converts on time, revenue should accelerate significantly. Management’s promise that FY2027 growth will exceed FY2026 hints at annual revenue rising from ~$7.3 billion (FY2026E) by at least 25%. If fulfilled, it validates the current consensus analyst target price of $334; if not, the target price divergence from $170 to $455 will widen. **Whether margins can break the 42% target in FY2027.** Current 39.6% is about 240bps from the target. The three main drivers (6-inch cost, yield, pricing) all have upside, but OCS and CPO initial revenue may enter at lower margins, so product mix effects on overall margin must be watched. If 6-inch InP reaches over 60% of total capacity in FY2027 H1, 42% margin should be achievable—this is also key for getting operating cash flow back to normal from currently depressed levels. **When new growth vectors turn from “story” into “revenue.”** OCS begins contributing incremental revenue in Q4, CPO starts in H2 2026, Multi-Rail and thermal management products in 2027. These addressable markets total over $6 billion (OCS $4bn + Multi-Rail $2bn, CPO’s $15bn not included), but near-term revenue contribution remains limited. For investors entering after a 400% run, the next 2–3 quarters are crucial for seeing these growth vectors move from slides to the P&L—6.7% post-earnings pullback is, in some sense, the market waiting for these validation signals. --- Risk Disclosure and Disclaimer The market involves risks, and investments require caution. This article does not constitute personal investment advice, nor does it take into account individual users’ specific investment goals, financial situations, or needs. Users should consider whether any opinions, viewpoints, or conclusions in this article suit their particular circumstances. Investment decisions are at their own risk.