Coherent Corp. makes lasers, optical components, and engineered materials that go inside other companies' products and machines. Its three business lines cover Networking (transceivers that move data through datacenters), Lasers (industrial and scientific laser systems), and Materials (specialty compounds and semiconductor wafers). Customers keep coming back because these components wear out, get replaced, or need upgrading as technology changes. Revenue comes almost entirely from making and shipping physical products across communications, industrial, instrumentation, and electronics markets. The diagram below traces where the money goes.
Five years of financial data tell a complicated story. Revenue grew from $3.1 billion in fiscal 2021 to $5.8 billion in fiscal 2025, but the path was not smooth. A large acquisition in 2022 nearly doubled the company's size overnight, bringing in new revenue but also a mountain of debt. Gross margin, the share of each dollar kept after making the product, dropped sharply when the combined company struggled to absorb costs.
The gross margin story is just as important as the revenue line. In fiscal 2021 and 2022, Coherent kept roughly 38 cents of every revenue dollar after production costs. After the acquisition, that dropped to about 31 cents in fiscal 2023 and stayed there in fiscal 2024. In fiscal 2025, it climbed back to 35 cents. That recovery came from higher sales volumes in the Networking segment, better pricing, and lower manufacturing costs. But the company has not yet returned to its pre-acquisition margin level.
Debt is the other weight on the business. Before the acquisition, Coherent had more cash than debt, meaning net debt was negative. After folding in Coherent, Inc., net debt jumped to $3.5 billion in fiscal 2023. The company has been paying it down: net debt was $2.8 billion at the end of fiscal 2025. Operating cash flow has stayed relatively steady at around $0.5 to $0.6 billion each year, but free cash flow (what remains after capital spending) has stayed at only about $0.2 billion since the acquisition. That is a narrow cushion for a company carrying this much debt.
The thing driving fiscal 2025's revenue recovery is the surge in AI datacenter construction. Big technology companies are building enormous AI computing clusters, and those clusters need huge numbers of optical transceivers to move data between chips and servers at very high speeds. Coherent's Networking segment, which sells those transceivers, grew 49% in fiscal 2025 to $3.4 billion in revenue. Segment profit in Networking jumped 82% to $644 million. That single business line is now doing most of the heavy lifting for the whole company.
The other two segments tell a quieter story. Materials revenue fell 6% in fiscal 2025, dragged down by weak demand for silicon carbide substrates used in electric vehicles. Lasers revenue grew just 3%, with strength in display capital equipment offsetting weakness in precision manufacturing. Both segments improved their profitability, but neither is growing fast enough to matter much against the scale of Networking.
Coherent faces four specific documented risks that are worth understanding clearly. The first is a government inquiry. The U.S. Bureau of Industry and Security asked the company in January 2025 about past sales to Huawei Technologies. Coherent is cooperating with an internal review. The outcome is unknown, but potential penalties or required changes to business practices could be significant. The second risk is materials supply. Coherent relies on rare materials including zinc selenide, germanium, yttrium, and rare earth minerals. China produces most of these globally and imposed export restrictions in 2024. A disruption to that supply chain could slow production.
The third risk is customer concentration. Two customers each accounted for more than 10% of total revenue in fiscal 2025. If either one cuts orders, changes suppliers, or pushes for lower prices, the impact would be felt immediately across the whole business. The fourth risk is trade policy. New U.S. tariffs introduced in early 2025 affect materials and products sourced from Asia. Retaliatory tariffs from other countries, particularly China, could raise costs further or restrict where Coherent can sell. The company says its diverse global manufacturing footprint provides some protection, but acknowledges it is not immune to sustained disruption.