Marvell to buy Lumentum for $115 billion, betting AI data centers move from copper to light

Under the definitive agreement, Lumentum stockholders will receive a fixed exchange ratio of 4.500 shares of Marvell common stock for each Lumentum share they own. The transaction carries an implied enterprise value of $115 billion for Lumentum, or approximately $1,132 per share — a premium of about 23.9% based on each company’s unaffected closing share price on October 28, 2026, the last trading day before market speculation about a potential transaction began. Post-closing, current Marvell stockholders would own approximately 67% of the combined company on a fully diluted basis, and Lumentum stockholders approximately 33%.

The pitch is architectural, not just scale. Marvell says the AI infrastructure industry is at an inflection point: rapidly growing bandwidth requirements and the physical limitations of copper-based connectivity are accelerating the move toward optical technologies. As AI systems scale to more complex architectures — particularly scale-up and scale-in, where large numbers of chips must share data at extreme speed — the industry is shifting from discrete, modular components toward highly integrated optical solutions that require electrical and optical technologies to be designed together.

Why optics, why now

The combination joins Marvell’s strengths in electrical and optical interconnect, network switching, custom XPU and XPU attach, and advanced semiconductor technology with Lumentum’s high-performance lasers, optical transceivers, optical circuit switching and specialised compound semiconductor manufacturing. The combined portfolio would span leading-edge CMOS, silicon photonics, compound semiconductors, advanced packaging and manufacturing — from connections between distributed data centers down to connections within advanced semiconductor packages.

“AI infrastructure is undergoing a fundamental architectural shift toward optical connectivity, creating an opportunity that comes along once in a generation,” said Matt Murphy, Marvell’s chairman and CEO. Lumentum chief executive Michael Hurlston put the market opportunity at $550 billion, saying surging AI data traffic “requires rapid hardware innovation, and this combination enhances our ability to deliver next-generation solutions at scale.” Both statements are the companies’ own framing; the $550 billion figure is their estimate of the combined addressable market, not a measured market size.

The Nvidia thread — and the market’s verdict

The two companies share an unusually prominent common backer. Nvidia invested $2 billion in Lumentum in March as part of a multi-year agreement to buy its advanced laser components, and later that month invested $2 billion in Marvell to support its optical networking and chips portfolio, TechCrunch reported. Murphy told CNBC the deal would benefit Nvidia by bringing together two of its key suppliers, calling it “a double down on supporting Nvidia,” Reuters reported. Nvidia did not respond to Reuters’ request for comment.

The combined company would generate more than $21 billion in annual revenue, with adjusted operating margins in the low 40% range on near-term forecasts, Reuters reported, citing the companies. For scale, TechCrunch noted the deal compares with Microsoft’s $68.7 billion purchase of Activision Blizzard in 2022 and Dell’s $67 billion purchase of EMC in 2016 — making the Marvell–Lumentum combination one of the biggest acquisitions in tech history on enterprise value.

Investors did not cheer on day one. Reuters reported Marvell shares fell more than 10% on November 2, and Lumentum shares tumbled more than 15%, as analysts questioned whether Marvell was paying too much and taking on too much at once. The purchase is more than ten times Marvell’s previous biggest, the $10 billion Inphi buyout in 2021, Reuters reported. Because the exchange ratio is fixed, the dollar value Lumentum holders ultimately receive will move with Marvell’s share price until closing; there is no cash floor in the announced terms.

The agreement carries large break fees, according to a regulatory filing cited by Reuters: Marvell would owe Lumentum $5.8 billion if its board withdrew or it accepted a takeover offer for itself, Lumentum would owe Marvell $2.9 billion in similar circumstances, and Marvell would pay $3.2 billion if regulators blocked the deal.

What has to go right

What the companies must now prove is the co-design story: that a combined electrical-and-optical team can deliver highly optimised, pre-validated optical solutions faster, at high volume, and with better bandwidth, performance and power efficiency than two separate suppliers could. Marvell says the combination is expected to enhance long-term revenue growth and margin profile, with line of sight to more than $1 billion in annual run-rate cost synergies — expectations, not results, and dependent on an integration that has not begun.

Alongside the announcement, Marvell reported preliminary revenue for the third quarter of fiscal 2027 consistent with its prior guidance, maintaining the midpoint while narrowing the expected range to plus or minus 2%, from plus or minus 5%. Lumentum separately reported results for its first fiscal quarter of 2027. Until the expected close in the first half of 2028, the deal remains a signed agreement subject to stockholder and regulatory approval — not yet a combined company.