Marvell Agrees to Buy Lumentum in $115 Billion All-Stock AI Networking Deal

Marvell Technology said Monday it has agreed to acquire optical-components maker Lumentum Holdings in an all-stock transaction that gives Lumentum an implied enterprise value of $115 billion, a deal the two companies are casting as a bid to control the optical "plumbing" that moves data through artificial-intelligence computing clusters. The merger agreement, signed November 1 and detailed in a joint announcement posted to Marvell's investor relations site, calls for every Lumentum share to convert into 4.500 shares of Marvell stock, worth roughly $1,132 per Lumentum share and representing a premium of about 23.9 percent over each company's unaffected closing price on October 28, the last trading day before reports of the talks surfaced.

The numbers

Under the fixed exchange ratio, Marvell shareholders would own about 67 percent of the combined company and Lumentum shareholders about 33 percent, on a fully diluted basis, according to the merger documents the companies filed with regulators. The companies project more than $1 billion in annual run-rate cost synergies and say the deal should add to Marvell's non-GAAP earnings per share in its first year after closing. They peg the combined company's addressable market at $550 billion, spanning everything from data-center networking to the optical links now being built inside advanced chip packages. The specifics, including the exchange ratio and closing conditions, are laid out in Lumentum's Form 8-K filed with the Securities and Exchange Commission and in a companion exhibit carrying the full merger announcement, while Marvell's own 8-K confirms its board unanimously approved the agreement, the related share issuance and a charter amendment. Closing is targeted for the first half of calendar 2028, subject to approval from both companies' shareholders, antitrust clearance and other customary conditions.

Context and reaction

The rationale rests on a familiar argument in AI hardware circles: as data traffic between chips and servers keeps climbing, copper wiring is running into physical limits, pushing networking toward optical connections that move light rather than electrical signals. Marvell already supplies the custom silicon and electrical interconnects used in AI server racks; Lumentum makes the lasers, transceivers and optical switches that would pair with that silicon. "AI infrastructure is undergoing a fundamental architectural shift toward optical connectivity," Marvell chairman and chief executive Matt Murphy said in the announcement, adding that he sees "an opportunity that comes along once in a generation." Lumentum chief executive Michael Hurlston said joining Marvell "creates a company uniquely positioned to capitalize on a market opportunity of $550 billion." Under the agreement, Murphy remains chairman and chief executive of the combined firm, while Hurlston and two other Lumentum directors join Marvell's board.

Investors had a notably cooler reaction to the prospect of the deal than the companies' own framing suggests. When Bloomberg first reported the two sides were in advanced talks on October 28, Marvell's stock fell more than 13 percent the next session, as investors weighed the dilution from an all-stock purchase of a company with a market value in the tens of billions against Marvell's roughly $3.9 billion cash position. Lumentum shares rose only modestly in the regular session before jumping after hours. Marvell tried to steady sentiment alongside Monday's announcement by confirming its preliminary fiscal third-quarter revenue was tracking in line with previous guidance and narrowing its forecast range.

What's next

The deal now moves to proxy filings and regulatory review, a process both sides acknowledge will stretch well into 2028 given the transaction's size and its implications for competition in optical networking, where few other suppliers operate at comparable scale. Analysts cited in early coverage, including by CNBC, have flagged integration risk given that Lumentum has also been a key supplier to Marvell's rivals, along with the usual uncertainties attached to antitrust review of a tie-up this large in a market central to the AI buildout. Shareholder votes at both companies, along with the customary regulatory filings in the U.S. and abroad, are expected over the coming months.