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

Marvell Technology has agreed to acquire optical components maker Lumentum Holdings in an all-stock transaction with an implied enterprise value of $115 billion, the largest semiconductor acquisition ever announced, surpassing Qualcomm's $47 billion bid for NXP and Nvidia's $40 billion bid for Arm combined. Under the terms, Lumentum shareholders receive a fixed exchange ratio of 4.5 Marvell shares for each share they hold, implying roughly $1,132 per share and a 23.9% premium to Lumentum's unaffected closing price on October 28. Marvell shareholders will own approximately 67% of the combined company, with Lumentum holders retaining the remaining 33%.

The strategic rationale centers on the accelerating shift from copper to optical connectivity as AI data centers demand faster data transfer, greater bandwidth and improved power efficiency. Marvell CEO Matt Murphy, who will lead the combined company, called the opportunity "once in a generation" and said the deal targets a combined addressable market of $550 billion by integrating Marvell's custom AI chips and networking silicon with Lumentum's lasers, optical transceivers and optical circuit switching capabilities. The companies project more than $1 billion in annual run-rate cost synergies and expect the transaction to be accretive to Marvell's adjusted earnings per share in the first year after closing. Marvell also separately reaffirmed the midpoint of its fiscal third-quarter revenue guidance while narrowing the expected range to plus or minus 2% from plus or minus 5%.

The deal is expected to close in the first half of 2028, subject to shareholder and regulatory approvals, with a deadline of November 1, 2027, extendable to August 1, 2028. Breakup terms are significant: Marvell owes $3.2 billion if regulators block the transaction or the deadline is missed, and $5.8 billion if its board withdraws or pursues a competing offer, while Lumentum owes $2.9 billion if it backs out. Reuters flagged Chinese regulatory approval as a potential source of delay.

Both stocks fell on the announcement despite the strategic logic. Marvell dropped roughly 5% to 7% on the day, extending a decline of nearly 26% over the prior week and a 25.8% loss in October as part of a broad AI sector selloff that wiped out $3.46 trillion in market value. Lumentum fell approximately 6%. Because the deal is all-stock, Marvell's share count expands by roughly 49%, meaning the value Lumentum holders receive moves directly with Marvell's share price. Competitor Coherent climbed about 2% as investors viewed the deal as validating the optical networking sector. Analyst reactions were mixed: William Blair reiterated its Outperform rating on Marvell, Raymond James upgraded Lumentum, while Stifel downgraded Lumentum, B.Riley lowered its Marvell price target and at least one firm downgraded Marvell to Hold citing likely share overhang. Melius Research also cut its Marvell price target as part of a broader pullback on AI hardware names. Law firm Halper Sadeh separately announced investigations into whether both Marvell and Lumentum shareholders are receiving fair value in the transaction.