Why Marvell Technology Stock Plunged 28.1% This Week

An agreement to acquire optical components provider Lumentum Holdings (NASDAQ:LITE) in an all-stock transaction valued at $115 billion sent Marvell Technology down 28.1% this week.

Marvell Technology stock changed hands at $141.20 as of the close on Friday, Nov. 6, having dropped 32% from Friday, Oct. 30's close, according to data provided by S&P Global Market Intelligence. Over the same period, the S&P 500 (SNPINDEX:^GSPC) fell 2.7%, and the Nasdaq-100 was down 4.9%.

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A $115 billion optical deal sparks heavy dilution concerns

On Monday, Marvell disclosed an agreement to acquire Lumentum at an enterprise value of $115 billion. Under the terms of the all-stock deal, the buyer will issue 4.5 of its own shares for every Lumentum share outstanding. In an all-stock transaction, issuing new shares expands the total share count, diluting existing shareholders by reducing their percentage ownership of future earnings while handing a significant portion of the combined entity to the target owners. Wall Street reacted swiftly: analysts at Bank of America cut their rating to neutral, and TD Cowen downgraded the stock to hold, noting that $1 billion in projected annual cost cuts falls far short of offsetting a roughly 50% increase in share count.

Lumentum manufactures laser components and optical transceivers that convert light signals into electronic data inside high-speed networks. Combining those optical lasers with Marvell's electronic digital signal processors allows the buyer to offer integrated optical interconnect modules for data centers. However, regulators in China and the U.S. must approve the tie-up, a process management expects could stretch into early 2028. Analysts also warned that Lumentum competes with several of Marvell's existing chip customers, creating potential channel conflicts during the multi-year closing window.

Marvell Technology sells wired networking and data infrastructure chips that process and move data within data centers and telecommunications networks to cloud providers and equipment makers. While adding optical laser manufacturing expands the target market for artificial intelligence connectivity, paying a fivefold premium over Lumentum's share price from a year ago strains balance-sheet discipline. Marvell's $115 billion acquisition of Lumentum shifts the investment case from a high-margin data center chip growth story to a complex, dilutive integration bet with years of regulatory uncertainty.

What's next for Marvell Technology

Investors will get their next operational update when Marvell reports fiscal third-quarter results on Dec. 1, 2026. Management narrowed its preliminary quarterly revenue guidance to approximately $3.2 billion, but near-term financial results are taking a back seat to deal execution risks. The stock is down 57.2% (as of the close on Friday, Nov. 6) from its 52-week high of $329.88, reflecting how sharply sentiment turned following the merger news.

Marvell trades at a trailing price-to-earnings (P/E) ratio of 52.6. Marvell's trailing price-to-earnings (P/E) ratio of 46.5 sits in the middle of a wide peer group, including Broadcom (NASDAQ:AVGO) at 37.5, Advanced Micro Devices (NASDAQ:AMD) at 96, and Micron Technology (NASDAQ:MU) at 9.3, so the multiple on its own does not say whether the stock is cheap; execution on its core data center chip business does.

Is Marvell Technology stock a buy?

By uniting its strengths in electrical and optical interconnect with Lumentum's proficiency in high-performance lasers and optical transceivers, Marvell sees the acquisition as a major step in its drive to become a leader in artificial intelligence (AI) infrastructure.

The prospect of shareholder dilution from the acquisition and the current pushback from communities over the development of AI data centers, however, suggest that investors should be wary of the rosy picture Marvell's management is painting. As a result, investors with Marvell stock on their radars may want to continue watching from the sideline for the time being, waiting for the tech stock to dip further before considering a position.

Bank of America is an advertising partner of Motley Fool Money. Scott Levine has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Advanced Micro Devices, Broadcom, Lumentum, Marvell Technology, and Micron Technology. The Motley Fool has a disclosure policy.