Coherent Corp. makes the hardware that moves light. It designs and manufactures lasers, transceivers, and optical components used inside AI datacenters, telecom networks, factory machines, semiconductor production tools, and medical devices. Nearly all of its revenue comes from selling these physical products to other companies, who then build them into their own systems. The business runs across three segments: Networking, which sells transceivers and optical components for datacenters and communications; Lasers, which sells industrial and scientific laser systems; and Materials, which sells engineered materials and specialty components. The diagram below traces where the money goes.
Five years of financial data tell a story about a company that got much bigger, took on significant debt to do it, and is now working to prove the combination was worth it. Revenue climbed from $3.1 billion in 2021 to $5.8 billion in 2025, the highest in company history. But that growth was not a straight line.
The jump from $3.3 billion in 2022 to $5.2 billion in 2023 came almost entirely from the acquisition of Coherent Inc., which roughly doubled the company's size overnight. That deal also loaded the balance sheet with debt. Net debt went from essentially zero in 2021 to $3.6 billion in 2023. By 2025 it had come down to $3.0 billion, but it remains a real weight on the business. Interest payments alone cost $196 million in fiscal 2025.
Gross margin tells a sobering part of the story. It ran around 38% before the acquisition, then dropped sharply to about 31% in 2023 and 2024 as the company absorbed higher costs, underutilized factories, and integration disruptions. In 2025 it partially recovered to 35%, helped by higher sales volumes and cost reductions. Free cash flow has stayed thin throughout, reaching only $0.2 billion in each of the last three years despite revenue nearly doubling.
The 2025 recovery was powered almost entirely by one engine: AI datacenter demand. Networking segment revenue rose 49% to $3.4 billion, and segment profit nearly doubled to $644 million. Coherent makes transceivers that connect servers inside AI datacenters, and hyperscale cloud companies have been ordering them in large volumes. The Lasers and Materials segments, by contrast, face weaker conditions in industrial and automotive markets.
The company is also in the middle of two active restructuring plans. In fiscal 2025, restructuring charges totaled $160 million, covering factory closures, workforce reductions, and asset write-offs. On top of that, the company recorded $85 million in impairment charges on assets it is preparing to sell. These are not trivial numbers against a free cash flow of $0.2 billion.
There are several specific risks documented in the company's filings. The first involves the U.S. government. Coherent was restricted from selling certain products to Huawei Technologies, and in January 2025 it received an inquiry from the U.S. Department of Commerce about past sales to Huawei. The company says it cannot predict the outcome or any financial penalties.
The second risk is supply chain fragility. Coherent uses exotic materials like zinc selenide, germanium, and rare earth minerals, some of which come from only one or two suppliers. China restricted exports of certain rare earth minerals in 2024. A sustained disruption in these inputs could halt production at specific factories with no easy workaround.
The third risk is customer concentration. Two customers each account for more than 10% of total revenue. That means a design change, a pricing dispute, or a delayed order from either one of them could move the needle noticeably on quarterly results. This already happened in 2024, when a single consumer electronics customer changed a product design and wiped out $265 million in Materials segment revenue.
The fourth risk is that the AI datacenter boom that is currently driving results could slow or change direction. New AI models, like DeepSeek mentioned in the company's own filings, could require less computing hardware than expected, which would reduce demand for the transceivers that are currently Coherent's fastest-growing product line. The company would then be left with factories and inventory sized for higher volumes.
Tariffs add another layer of uncertainty. The U.S. imposed significant new tariffs in early 2025, and other countries responded with their own. Coherent says these did not materially hurt results in fiscal 2025, and its geographically diverse manufacturing gives it some flexibility. But the company also says it is not immune to a sustained disruption in global trade.