The Key Gamble on the Road to Trillions: Why Did Marvell Decide to Acquire Lumentum?

Original | Odaily Planet Daily (++@OdailyChina++)

Author | Azuma (++@azuma_eth++)

On October 28, Eastern Time, after the US stock market closed, the global semiconductor and optical communication market was hit with a major announcement.

According to Bloomberg and The Information, citing informed sources, chip design giant Marvell Technology (NASDAQ: MRVL) is in deep negotiations to acquire data center optical component leader Lumentum Holdings (NASDAQ: LITE).

Sources revealed that if progress goes smoothly, a formal agreement could be announced as early as next week (early November). However, before the final signature, there remains the possibility of delays or even a breakdown in the deal. As of now, reports from various media have not disclosed the specific per-share acquisition price or the payment structure (the exact ratio of cash to stock is unknown), but considering Lumentum's massive scale, the market generally expects the transaction to involve a very high proportion of stock exchange.

Before the acquisition news broke, benefiting from the explosion in demand for AI data center optical interconnects, Lumentum's stock price had soared over 360% in the past year, with a market capitalization of approximately $83 billion; while buyer Marvell's market capitalization is about $221 billion. When accounting for the usual acquisition control premium, this potential deal, characterized by foreign media as an "AI super acquisition," could potentially approach a total scale of $90 billion to $100 billion.

If finalized, this would not only be an unprecedented merger in the history of optical communication but also become the most expensive gamble in the global semiconductor industry this year.

Marvell's Motivation: Positioning for "Optical In, Copper Out" and Securing Scarce Capacity

Marvell's willingness to invest heavily in Lumentum stems from the underlying drive that AI computing infrastructure is hitting a physical wall.

As AI computing clusters evolve from tens of thousands to hundreds of thousands and millions of cards, traditional copper cable connections between servers and racks are nearing their limits in terms of signal attenuation, heat dissipation, and physical transmission distance. "Optical In, Copper Out" is no longer just a long-term vision but a rigid survival rule for data center networks evolving towards 1.6T, 3.2T, and even CPO (Co-Packaged Optics).

For Marvell, acquiring Lumentum is core to two strategic demands.

First, to establish a fully integrated vertical loop of "electrical chips + optical devices." As early as 2021, Marvell acquired Inphi for $10 billion, securing absolute dominance over the core electrical chip for optical modules—the PAM4 DSP (Digital Signal Processor). However, as the industry enters the deep waters of ultra-high-speed optical interconnects, relying solely on DSP electrical chips can no longer meet the stringent requirements of optoelectronic co-packaging (such as silicon photonics and CPO).

The target of this acquisition, Lumentum, possesses world-leading EML (Electro-Absorption Modulated Laser) and CW (Continuous Wave) high-power laser technology, and Marvell itself is a major customer of Lumentum's laser components. Bringing Lumentum into the fold means Marvell can achieve tightly coupled internal R&D from foundational computing connections, DSP electrical chips to upstream laser light sources, thereby intercepting the substantial margins that would otherwise flow to upstream suppliers.

Second, to control the industry's most critical "Indium Phosphide" (InP) wafer production line and seize supply chain allocation rights.

Currently, the biggest bottleneck in global optical communication is not on the demand side but in the severely depleted capacity of upstream indium phosphide laser wafers. Lumentum CEO Michael Hurlston stated in an interview with Bloomberg in early October that Lumentum's optical device capacity is essentially sold out and scheduled until early 2029, with some customers even locking in orders for 2030; by 2027, up to 70% of customer demand for some core products will not be met, and the supply gap for 2028 will reach about 30%.

This extreme scarcity could directly threaten Marvell's core growth logic. In high-speed optical modules, electrical chips and optical chips are strictly complementary—every missing set of lasers upstream means Marvell sells one less high-margin DSP or silicon photonics solution. More critically, as the industry evolves towards CPO, the bundling of external high-power light sources with computing chips has become an inevitable trend. Since building a new indium phosphide wafer factory typically requires a ramp-up period of 3 to 5 years, Marvell's decision to acquire Lumentum, which owns the world's core InP production line, essentially consolidates the industry's most scarce "optical ammunition depot" for the next three years and retains control over supply chain capacity scheduling.

A Tale of Two Markets: Why Did Lumentum Soar While Marvell Plummeted?

After the acquisition rumors surfaced, the stock price movements of Marvell and Lumentum were starkly opposite during after-hours trading—Marvell fell more than 10% at one point, with after-hours quotes around $230, and the after-hours decline still exceeding 8%; Lumentum, on the other hand, soared over 17% at one point, with after-hours quotes around $993, and an after-hours increase of 8.65%.

For the target of acquisition, Lumentum, the combination of an already extremely tight capacity cycle with the expectation of a huge "control premium" naturally led to a surge in stock price; however, the same transaction triggered a sell-off of Marvell due to Wall Street's concerns about the "financial books" behind this multi-billion dollar deal.

The first concern is the staggering acquisition cost and the pressure of equity dilution. Lumentum is not a cheap asset at the bottom of the cycle; catalyzed by the narrative of AI optical interconnects, its stock price has multiplied several times over the past year, with some Wall Street institutions recently giving aggressive target prices of $1200. Near historical highs, swallowing a giant worth more than a third of its own market cap and paying a considerable control premium means that Marvell, which does not have extremely abundant cash flow, will inevitably need to issue a massive amount of new shares or incur significant debt. For a considerable time after the deal closes, Marvell's existing shareholders will face severe dilution pain in earnings per share (EPS).

The deeper divergence lies in the fact that this transaction will fundamentally rewrite Marvell's business model DNA. For a long time, Marvell has been a typical fabless chip design company, outsourcing all wafer manufacturing to TSMC, thus enjoying a light asset, high-margin valuation model; whereas Lumentum is a true IDM (Integrated Device Manufacturer) giant, owning multiple self-built indium phosphide wafer factories and packaging testing bases worldwide. Transitioning from "light asset design" to "heavy asset manufacturing," Lumentum's massive fixed asset depreciation and capital expenditures (CapEx) for production line expansion are likely to lower Marvell's originally attractive overall gross margin.

On one side is a long-term vision of an optoelectronic closed-loop blueprint, and on the other is the imminent threat of equity dilution and margin pressure, making it understandable why Wall Street institutions chose to "sell first, ask questions later" in after-hours trading.

Will Coherent Reap the Benefits?

As the two main players on the table cause industry tremors, another global giant in photonics and optical communication devices, Coherent (NASDAQ: COHR), also saw a noticeable rise in its stock price after hours, briefly surpassing $250.

The market's optimism towards Coherent may be related to its "supply chain neutrality." Before this acquisition, Lumentum was a neutral public supplier in the industry, serving not only major cloud vendors and optical module manufacturers but also chip giants like Broadcom, NVIDIA, and AMD. Once Lumentum is fully acquired by Marvell, it will transition from being a "public arms dealer" to an "exclusive asset controlled by a direct competitor."

For Broadcom and major cloud vendors, entrusting their core network equipment's lifeline (lasers) to a competitor like Marvell in the custom chip and switch domain is absolutely unacceptable in terms of supply chain security. To adhere to the "second source" principle and avoid being choked, those major customers who were originally waiting in line for Lumentum's capacity until 2027-2028 are likely to accelerate their orders, capacity expansion prepayments, and long-term contracts towards the only remaining independent optical device leader, Coherent.

In other words, if the transaction between Marvell and Lumentum ultimately goes through, Coherent's status as an "independent third party" and its existing mature capacity may directly enjoy a higher scarcity valuation premium.

Marvell's Path to Trillions

In June this year, NVIDIA founder Jensen Huang had a conversation with Marvell CEO Matt Murphy on stage. When discussing the evolution of AI infrastructure, both made a forward-looking industry judgment: The first wave of bottlenecks in AI is computing power, creating the first company with a $5 trillion market cap, NVIDIA; the second wave of bottlenecks is storage, giving rise to three trillion-dollar storage giants; and the next ultimate bottleneck will be "connectivity."

On that stage, Huang pointed at Marvell and exclaimed to the audience: "Ladies and gentlemen, this is the next company to reach a trillion-dollar market cap!"

For captain Matt Murphy, to truly leap from the current $221 billion market cap into Huang's predicted "trillion-dollar club," merely relying on selling DSP chips or doing custom ASIC foundry work for cloud vendors has a clear ceiling.

Only by acquiring Lumentum and merging the most scarce light source capacity in the industry for the next three years with its own silicon photonics, DSP, switches, and custom XPU technology into an inseparable closed loop can Marvell truly transform from a "core supporting role selling shovels" to the "infrastructure rule maker" of the AI optical interconnect era.

By early next week, the cards for this nearly $100 billion deal may be officially revealed, and the reshuffle of the global AI computing supply chain's second half is just beginning.