Marvell Technology has agreed to buy optical-components maker Lumentum in an all-stock transaction valued at $115 billion, one of the largest technology deals of the year. It is a bold bet that the next phase of artificial intelligence hardware will be defined by light rather than copper.
The terms
Lumentum stockholders will receive a fixed ratio of 4.500 Marvell shares for each Lumentum share, which implies an enterprise value of $115 billion, about $1,132 per share and a premium of roughly 23.9% to the October 28 closing prices. That was the last trading day before speculation about a deal began.
After closing, Marvell shareholders would own about 67% of the combined company and Lumentum shareholders about 33%, and both boards approved the agreement unanimously. Reuters put the equity value at $102.54 billion, and Bloomberg ranked it as the largest M&A deal of 2026 by that measure.
Why optical matters
The strategic logic centres on data-centre bandwidth. The companies argue that rapidly growing bandwidth requirements and the physical limits of copper-based connectivity are accelerating the shift toward optical technologies. As AI clusters grow, moving data between chips becomes as important as the chips themselves.
Marvell chief executive Matt Murphy described the opportunity as one that comes along once in a generation. Lumentum supplies lasers and optical modules that are essential to that shift, while Marvell brings custom silicon and networking expertise. The pairing is expected to expand the combined company’s addressable market to $550 billion.
The companies expect more than $1 billion in annual run-rate synergies and accretion to Marvell’s adjusted earnings one year after closing. The deal is expected to close in the first half of 2028, subject to approvals.
A direct challenge to Broadcom
The deal also sharpens a rivalry. It positions Marvell against the larger Broadcom, which has long been Google’s main custom-chip partner and offers customers a broader range of AI data-centre hardware. By pulling optical connectivity in-house, Marvell is trying to offer a more complete package.
It is also a major step up in scale. The Lumentum acquisition is Marvell’s biggest since its $10 billion purchase of Inphi in 2021, and it follows the $3.5 billion acquisition of photonics firm Celestial AI, completed in February.
Investors react badly
The market did not applaud. Marvell shares fell 13% on the announcement, and Lumentum finished down 18.59% at $684.40. The reaction is partly about structure. An all-stock offer is dilutive to existing shareholders, and the market does not appear convinced of the payoff given the large price.
Timing made it harder. Both stocks had already declined sharply since reports of deal talks surfaced late last month, amid growing concerns about an AI bubble. A deal of this size also arrives as investors question whether the largest AI spenders can keep funding their build-outs, a worry that has hit chip stocks hard in recent days.
The risks ahead
Analysts will focus on three issues. The first is integration, since combining a chip designer with a manufacturer of optical components is complex. The second is the long timetable, with closing not expected until 2028, which leaves ample time for markets, regulators and customers to change course. The third is whether optical connectivity grows as fast as the companies predict, or whether rivals find cheaper alternatives.
Regulatory scrutiny is also likely, given the size of the transaction and the strategic importance of AI infrastructure. The companies have said they will file the required documents with US securities regulators.
What it signals
Whatever the short-term share reaction, the deal underlines where the industry believes value is moving. The first phase of the AI boom rewarded makers of processors. The next may reward those who connect them. Marvell is wagering heavily that optical links will become the bottleneck, and it is prepared to hand a third of its future to Lumentum’s shareholders to own the solution.
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