Marvell to Buy Lumentum in $115B All-Stock Optical AI Deal

Marvell Technology has agreed to acquire optical components specialist Lumentum in an all-stock deal valued at $115 billion, the largest technology-sector merger on record and the biggest M&A transaction of 2026 by equity value, according to Bloomberg.

The combined company will give Marvell shareholders 67% ownership and Lumentum shareholders the remaining 33%. Both boards expect the transaction to close in the first half of 2028.

The deal values each side of the business at roughly $77 billion for Marvell and $38 billion for Lumentum at the stated split. That scale matters for practitioners: this is not a tuck-in acquisition but a full restructuring of the AI supply chain's connectivity layer.

Why optical, and why now?

Marvell said the AI infrastructure industry stands at an inflection point. Bandwidth requirements inside data centres are growing rapidly, and what the company called the "physical limitations of copper-based connectivity" are accelerating the shift toward optical technologies.

The engineering logic is straightforward. Electrical interconnect over copper faces distance and power constraints as accelerator clusters scale. Optical links, built on lasers, transceivers and circuit switching, extend reach while holding power per bit in check.

Marvell brings electrical and optical interconnect silicon plus its broader advanced semiconductor portfolio. Lumentum contributes high-performance lasers, optical transceivers, circuit switching and specialised compound semiconductor manufacturing. In effect, the buyer gains the photonics stack it previously had to source alongside.

What does the combined company claim?

The companies set out four stated objectives for the tie-up:

• Create a category leader in AI connectivity
• Accelerate customer innovation
• Pool specialised manufacturing capabilities
• Deliver long-term stockholder value

They put the combined company's addressable market at $550 billion. That figure is a vendor projection of total available spend, not committed revenue, and should be read as marketing framing until customer contracts materialise.

The manufacturing point deserves attention from component buyers. Lumentum's compound semiconductor production gives the merged entity in-house capacity at a layer of the supply chain where capacity, not design, has been the binding constraint for optical modules.

The CEO's framing

Marvell chair and CEO Matt Murphy described AI infrastructure as undergoing a fundamental architectural shift toward optical connectivity, calling it a once-in-a-generation opportunity.

"The companies that move first and help define this transition will set the standard for decades to come," Murphy said.

That statement is a competitive positioning claim, not a forecast with numbers attached. It signals Marvell's intent to set de facto interface and module standards early, which will matter for hyperscalers and equipment vendors designing AI clusters in the 2027-2030 window.

What changes for the market

For optical component suppliers such as Coherent, InnoLight and Fabrinet, the merger creates a vertically integrated rival spanning silicon, lasers and transceivers. For Marvell's merchant customers, the question is whether the combined company prioritises internal integration over open supply.

The 2028 closing date leaves roughly two years of regulatory review and independent operation. US and likely Chinese antitrust scrutiny of a deal this size is standard context, though the source does not detail which clearances are required.

With the transaction expected to complete in the first half of 2028, the merged company's first joint product decisions and any customer commitments disclosed before then will indicate whether the $550 billion addressable-market claim translates into bookings.