Marvell Technology Stock Falls on $115B Lumentum Deal

Marvell agreed to buy Lumentum in a $115 billion all-stock deal for AI optical networking, and shares of both companies fell sharply in Monday trading.

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What Are the Terms of the Marvell-Lumentum Deal?

Lumentum shareholders will receive 4.5 Marvell shares for each Lumentum share they own. That values Lumentum at about $1,132 a share, a premium of roughly 23.9% to the unaffected closing prices of Oct. 28, the last session before deal speculation began.

After closing, Marvell shareholders will own about 67% of the combined company on a fully diluted basis and Lumentum shareholders about 33%. Marvell CEO Matt Murphy will serve as chief executive and chair. Lumentum CEO Michael Hurlston and two other Lumentum directors will join Marvell's seven-member board. Marvell is based in Santa Clara, California, and Lumentum in San Jose.

The companies expect more than $1 billion in annual run-rate cost savings. They also expect the deal to add to Marvell's non-GAAP earnings per share in the first year after closing. Completion is targeted for the first half of 2028, subject to approval by both companies' shareholders and by regulators.

Why Is Marvell Buying an Optical Company?

Marvell is buying Lumentum because optical links are becoming the bottleneck in AI data centers. As clusters of accelerators grow, copper connections struggle to carry data over longer distances at acceptable power levels, and lasers and photonic components fill the gap.

Marvell already supplies the chips that drive those links. Owning the laser and optics layer gives it control of more of the connectivity stack. The companies put the combined addressable market at $550 billion.

Lumentum's latest quarterly results show the demand. Revenue reached $1.26 billion, up from $533.8 million a year earlier, and adjusted earnings of $4.57 a share beat the $4.21 expected. Its shares had gained about 278% over the past year before the announcement.

Why Did Marvell Technology Stock and Lumentum Shares Fall?

Both stocks fell because investors priced in dilution first and gave no credit yet for synergies. Marvell traded near $183 to $186 in early trading, down roughly 5% to 7%, on volume of about 18.7 million shares. Lumentum traded near $750 to $756, down about 10%, on volume of about 5.1 million shares.

Marvell had already lost about 20% over the prior week and about 32% over the prior month. The fixed exchange ratio means the value Lumentum holders receive moves with Marvell's price. At Monday's levels, the offer implied roughly $824 to $836 a share, well below the headline $1,132. That left Lumentum trading at a discount of about 9% to the implied deal value.

The main concerns are:

• Timing: the purchase comes after a steep run in AI-linked valuations.
• Integration: Lumentum is about half Marvell's size, so absorbing it is a large task.
• Exposure: the long path to a 2028 close leaves the companies exposed to any change in AI capital spending.

What Comes Next for the Deal?

The next steps are proxy filings, shareholder votes, and antitrust and foreign-investment reviews. Because the deal joins a chip designer with a laser supplier rather than direct competitors, the review is likely to focus on supply relationships with large cloud customers. The review's length also gives the combined entity time to show whether optical demand holds.

Outlook

The transaction ties Marvell's growth to AI optical networking at a point when its own shares are under pressure. The fixed exchange ratio, the 2028 timeline and the $1 billion synergy target set the benchmarks to watch. They are the share-price spread between the two companies, the regulatory calendar, and whether AI infrastructure spending keeps rising until the deal closes.