Marvell Bets $115 Billion on Lumentum to Own AI's Optical Future

Marvell Technology has signed a definitive agreement to acquire Lumentum at an enterprise value of $115 billion, the second-largest tech deal ever after the SpaceX-xAI merger, according to Bloomberg. The all-stock transaction, announced November 2, would fuse two of the biggest names in data center optics into one company just as AI clusters push copper to its physical limits.

Lumentum shareholders will receive 4.5 Marvell shares per share — roughly $1,132 per Lumentum share, a 23.9% premium over the unaffected October 28 closing price. Marvell's current holders keep about 67% of the combined company; Lumentum's get 33%. Both boards approved unanimously. Closing is expected in the first half of 2028.

Why does Marvell want a laser company?

The deal is Marvell's third major move in optical connectivity, following its $10 billion Inphi acquisition in 2021 and the $3.5 billion upfront purchase of co-packaged optics startup Celestial AI, completed in February 2026. Each deal covers a different layer of the stack that moves data between AI processors, racks, and data centers.

The physics driving this is simple. Copper interconnects stop being practical at roughly one to two meters, while modern AI data centers run thousands of interconnected accelerators exchanging enormous data volumes. The industry's answer is light — first in pluggable transceivers for inter-rack links, and increasingly inside the package itself, where co-packaged optics places a photonic integrated circuit directly on the switch or accelerator, shrinking the electrical path from inches to microns.

Marvell already owns most of the electronics side: custom AI accelerators, Ethernet switches, high-speed SerDes, optical DSPs, drivers, TIAs, and silicon photonics. Lumentum supplies the photonics Marvell lacks — high-performance lasers, modulators, photodetectors, transceivers, and optical circuit switches.

What about the factories?

The strategic core is indium phosphide. Silicon has an indirect bandgap and is inefficient at generating light; InP structures emit and detect it efficiently, making them the material of choice for high-speed communication lasers. Lumentum owns and operates specialized InP fabs — a footprint CEO Michael Hurlston called the world's largest InP manufacturing capacity during the announcement.

That changes Marvell's business model. Marvell runs fabless today; if the deal closes in 2028, it becomes a hybrid, inheriting Lumentum's internal factories while keeping its chip side outsourced. The combined company also gains gallium arsenide technologies.

The move mirrors Broadcom, Marvell's biggest optics rival, which already offers both electronic chips and optical components. Nvidia, which invested $2 billion in Marvell in March 2026 to bring Marvell's custom XPUs and scale-up networking into NVLink Fusion, also holds a separate $2 billion stake in Lumentum — a position that would convert into Marvell shares.

What are the numbers?

• Marvell expects the combined total addressable market to reach about $550 billion by 2030 — roughly $60 billion more than the two companies' standalone estimates combined.
• Management projects more than $1 billion in annual run-rate cost synergies, mostly from cost of goods sold.
• The merged business would carry about $17.7 billion in annualized revenue based on current-quarter guidance; CEO Matt Murphy said pairing Lumentum's next-quarter guidance with analyst consensus for Marvell lifts that above $21 billion.
• Lumentum posted $1.26 billion in revenue for its first fiscal quarter of 2027, up 136.5% year over year, and announced a second major near-packaged and co-packaged optics design win that Hurlston expects to generate more than $5 billion.

Will customers and regulators go along?

Vertical integration raises a classic conflict: Marvell supplies optical module makers, while Lumentum sells components to companies that compete with its transceiver business. Murphy told investors on the November 2 call that Marvell intends to maintain its existing component supply model, and Hurlston noted that supplying competitors is already standard practice in optics.

Investors weren't convinced. Marvell shares closed down 12.7% at $171.41 on November 2; Lumentum fell 18.6% to $684.40 — a signal that the market questions whether growth can justify the valuation.

The agreement carries an outside date of November 1, 2027, extendable to February 1, May 1, and August 1, 2028 if regulators stall. A pure regulatory failure costs Marvell $3.2 billion; a board walkaway or rival bid triggers $5.8 billion from Marvell or $2.9 billion from Lumentum. Between now and 2028, the combined company will have to prove that a $115 billion bet on light beats copper's last meters — and that Broadcom, Nvidia, and its own anxious customers will let it.