Marvell to Acquire Lumentum in $115 Billion All-Stock Deal

Marvell Technology has signed a definitive agreement to acquire Lumentum in an all-stock transaction with an implied value of about $115 billion. The deal, announced today, combines Marvell's electrical interconnect and custom silicon portfolio with Lumentum's high-performance lasers, optical circuit switching (OCS), and compound semiconductor manufacturing. For AI infrastructure designers hitting the physical limits of copper, the combination targets deeper co-design across the full signal chain — from distributed data centers to connections inside advanced semiconductor packages.

Why is Marvell paying $115 billion?

The primary driver is the industry transition from electrical to optical connectivity as AI clusters scale. At the Marvell Computex 2026 keynote, CEO Matt Murphy called connectivity the next major bottleneck in data center design, noting that compute performance gains now outpace gains in connectivity and networking.

Marvell already sells solutions across distances ranging from long-haul coherent links to short-reach scale-up domains. But the "copper wall" — the maximum distance copper can viably carry a signal before integrity fails — keeps moving closer as lane speeds increase. The copper-to-optics transition is underway, though slower than many expected a decade ago.

Takeaway: the deal is a bet that optics, not copper, will carry the next generation of AI cluster traffic.

What does each side bring?

Marvell's existing portfolio covers parts of the challenge today. Its COLORZ 800 module, a coherent-optics part that sustains 800 Gbps over distances up to 1,000 km, uses coherent detection and a local oscillator to preserve signal integrity, packaging complex DSPs and photonics into a standard OSFP form factor. That works for long-reach scale-across links. Co-packaged optics (CPO), however, demands tighter integration between switch silicon and the optical engine.

The proposed combination pairs:

• Marvell: electrical and optical interconnect, CMOS and silicon photonics, switching and custom silicon design, packaging expertise
• Lumentum: specialized compound semiconductor manufacturing including indium phosphide (InP), high-speed lasers, high-power lasers, and optical circuit switching

Evidence of the direction already exists. At OCP 2025, Marvell showed its TX9190 CPO switch, where near-package optical engines shorten the electrical path: fiber runs and pluggable light sources replace long PCB traces.

By acquiring Lumentum, Marvell intends to control more of the supply chain internally and design across a larger domain, instead of sourcing different parts from different vendors.

Takeaway: Marvell wants one roof over the entire signal chain, from DSP to laser.

What does optical circuit switching add?

Lumentum's R300 OCS establishes direct optical paths between endpoints using micro-electro-mechanical systems (MEMS) mirrors. Those switched paths eliminate intermediate packet processing and optical-electrical-optical (OEO) conversion. According to Lumentum, the result is dramatically lower latency, higher signal integrity, and significant reductions in network power for large GPU clusters.

Takeaway: MEMS-based switching routes light directly, cutting both latency and power for GPU clusters.

Who owns what after the deal?

The $115 billion price is financed entirely with Marvell stock, leveraging the value of a company worth roughly $175 billion — a structure that makes the transaction closer to a merger than a buy-out.

The post-close split:

• Marvell shareholders: 67% of the combined company
• Lumentum shareholders: 33%
• Three Lumentum board members join Marvell's board, expanding it to 10 members

Takeaway: Lumentum holders take a full third of the combined company — a merger in all but name.

When does it close?

The deal is expected to close in the first half of 2028, leaving a considerable runway before integration begins. The companies say closer co-design will yield optimized, pre-validated optical solutions, faster time to market, and high-volume production.

The scale of the transaction lands amid soaring AI-driven valuations across the sector. Until the 2028 close, Marvell and Lumentum remain separate companies.