Marvell Bets $115 Billion in Stock That AI Data Centers Go Optical

Marvell Technology will acquire Lumentum in an all-stock deal valuing the photonics maker at an implied enterprise value of $115 billion, the two companies announced Monday, placing one of the largest technology deals on record behind a single wager: the copper wiring inside AI data centers is close to its limits.

Lumentum stockholders will receive a fixed 4.500 Marvell shares for each share they hold, which works out to roughly $1,132 per share. That exchange ratio represents a premium of about 23.9% based on both stocks' closing prices on Oct. 28, the last trading day before word of the talks surfaced. Marvell's current holders will own about 67% of the combined company on a fully diluted basis; Lumentum's will own about 33%. Bloomberg ranked the transaction among the largest technology deals on record.

Why a chip designer wants a laser maker

The deal joins two companies that sit on opposite sides of the same physical problem. Marvell sells DSPs and other interconnect chips, network switches, and custom AI processors it calls XPUs to cloud companies designing their own silicon — the electrical side of the network. Lumentum works in photonics: high-speed and high-power lasers, optical modules, and optical circuit switches, backed by its own compound semiconductor manufacturing, including indium phosphide. Marvell's investor presentation credits Lumentum with the world's largest indium phosphide wafer fab capacity.

The strategic argument is that the next generation of AI hardware needs both sides designed together. Optics already carries data between data centers and between racks inside them. The companies expect optical links to move into shorter "scale-up" and "scale-in" connections, down to links inside a chip package itself — the territory of co-packaged optics, or CPO, where the optical engine sits in the same package as the switch or processor.

"AI infrastructure is undergoing a fundamental architectural shift toward optical connectivity, creating an opportunity that comes along once in a generation," Matt Murphy, Marvell's chairman and CEO, said in the announcement.

Lumentum arrives with momentum of its own. In results released the same morning, it reported fiscal first-quarter revenue of $1.26 billion, up 136.5% from a year earlier, and forecast $1.575 billion to $1.625 billion for the current quarter. CEO Michael Hurlston said Lumentum landed its second major NPO/CPO win in the quarter, "backed by purchase commitments exceeding $5 billion."

What does the combined company look like?

Put together on an annualized basis, the two companies generate about $17.7 billion in revenue, $12.6 billion of it from Marvell, according to the investor presentation. Management puts the combined addressable market at $550 billion in 2030 and sees a path to more than $1 billion in yearly run-rate cost savings, mostly in cost of goods sold. The companies expect the deal to add to Marvell's adjusted earnings per share in its first year after closing.

Governance terms favor Marvell. Both boards approved the agreement unanimously. Murphy stays on as chairman and CEO. Three Lumentum directors, Hurlston among them, will join Marvell's seven-member board. The transaction still requires votes from both companies' stockholders and regulatory approvals that the announcement did not detail, and the companies do not expect to close it until the first half of 2028 — a long runway for a deal priced today.

Where do Broadcom and Nvidia fit?

The obvious rival is Broadcom, which has long served as Google's main partner for custom chips and can sell a cloud customer a wider range of data center hardware than Marvell, as CNBC noted. The two have fought over accounts before: WebProNews reported last year that Microsoft was negotiating with Broadcom over custom Azure chip work that Marvell had been performing.

Marvell has spent the past year building its own position. In August, it signed an agreement to supply chips that work alongside Google's AI processors, worth up to $120 billion in sales through fiscal 2033. In February, it closed its $3.5 billion purchase of Celestial AI, a photonics startup. The Lumentum deal scales that same thesis up by more than an order of magnitude.

Nvidia, notably, already holds stakes on both sides of the transaction. It agreed in March to invest $2 billion in Lumentum, alongside a multibillion-dollar purchase commitment for laser components and funding toward a new U.S. fab. At the end of that month, it put another $2 billion into Marvell through convertible preferred stock, as part of a partnership that brings Marvell's custom XPUs into Nvidia's NVLink Fusion platform.

How have investors reacted?

The market had cooled on both stocks while the talks were in the news. Since reports first surfaced late last month, Lumentum shares fell about 8% and Marvell's about 22%, CNBC reported, as a wider chip selloff gathered pace after Intel's weak forecast. The 23.9% premium was set against Oct. 28 prices, before that slide.

The deal's scale tells the story of where AI infrastructure spending is heading. A $115 billion all-stock bet on lasers and indium phosphide fabs, with a $550 billion addressable-market estimate attached, signals that the industry's largest players now treat optical interconnect — not just compute — as the bottleneck and the opportunity in next-generation AI hardware. Whether Marvell can integrate a laser maker and defend its custom-silicon accounts against Broadcom while the deal waits until 2028 to close will determine if the wager pays.