Marvell Bet $115 Billion on Lumentum, and Investors Knocked a Quarter Off the Deal in Three Trading Days

Marvell announced one of the biggest tech takeovers ever on Monday, a $115 billion all stock purchase of laser maker Lumentum. The market answered by selling both companies.

Marvell closed down about 13%. Lumentum ended down more than 18%. Targets usually rally when a buyer offers a premium. This one fell harder than the buyer.

The headline and the real price

On paper the terms are generous. Lumentum holders get 4.5 Marvell shares for each of theirs, worth $1,132 a share and a 23.9% premium on the unaffected close of October 28. Both boards approved unanimously. Marvell holders would own 67% of the combined company, closing is expected in the first half of 2028, and the companies are targeting more than $1 billion a year in cost savings.

Marvell CEO Matt Murphy, who would run the combined business, called it a once in a generation opportunity as AI data centers move from copper to optical links. The companies put the addressable market at $550 billion.

The trouble is the currency. Marvell is paying in its own stock, and that stock has been falling since Bloomberg News reported advanced talks on October 28. It closed at $218.34 on October 29, down about 13%. On Friday it lost another 10% to $196.40 as AI hardware stocks sold off alongside Intel's worst day ever. By Monday morning the slide from the unaffected price had reached roughly 26% in three sessions, and it kept going into the close. Before the leak, Marvell was worth $221 billion.

At Monday morning's price of around $185 a Marvell share, the 4.5 shares come to about $835, roughly 26% below the $1,132 headline. Lumentum traded near $750 on Monday morning, about 10% below even that. The gap is the market's guess that a deal needing approval from both sets of shareholders and from regulators in the US, Europe and China could fall apart over the next 18 months.

Why both stocks fell

Marvell had rallied more than 120% this year before the talks surfaced and traded above 60 times trailing earnings. Paying in stock read as management saying its shares were fully priced. Lumentum had more than quadrupled in the 12 months before the talks. Morgan Stanley analysts called it a deal struck at "peak cyclical conditions."

The mechanics add pressure. Merger arbitrage funds buy Lumentum and short 4.5 Marvell shares against each one, which pushes Marvell lower. Marvell will also issue more than 430 million new shares.

Then there is antitrust. The deal combines the leading custom AI chip designer outside Broadcom with one of the two dominant suppliers of AI lasers, and each company counts some of the other's competitors as customers.

"While a coming together of Marvell and Lumentum may make business sense, the question as to whether it makes financial sense will hinge on how much Marvell management is willing to pay measured against the incremental revenue and profit to be had plus any incremental synergies," said Chris Versace, lead portfolio manager at TheStreet Pro.

The backdrop is not calming anyone. Bernstein found that only 35% of currently planned data center capacity is likely to be completed. Marvell has done big optical bets before, with the $10 billion Inphi takeover in 2021 and Celestial AI for $3.5 billion in February. It has guided fiscal third quarter revenue to $3.15 billion, up more than 50%, and reports around November 26.

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