Record quarter. Guidance raised twice. The stock fell 10%.

What actually happened Thursday night

Start with the quarter, because it was a very good one. Revenue of 2.739 billion dollars was a company record, up 37% year over year and 13% sequentially, and it landed 39 million above the midpoint of guidance. Non GAAP earnings of 0.94 per share were up 40%. Operating margin expanded to 36.6%. Cash flow from operations came in at 605.5 million, and the company returned 254 million to shareholders including 200 million of buybacks.

Data center revenue reached 2.172 billion, up 46% year over year and 18% sequentially, and now represents 79% of total sales against 74% a year ago. This is no longer a diversified chip company with an AI segment. It is an AI infrastructure company with a legacy business attached.

Then the guidance. Third quarter revenue is guided to 3.15 billion plus or minus 5%, up 15% sequentially and better than 50% year over year, with non GAAP earnings of 1.05 to 1.15. Full year fiscal 2027 was raised to approximately 12 billion, about 45% growth, up from a prior outlook near 11.5 billion. And fiscal 2028 was raised to approximately 18 billion, roughly 50% growth, up from 16.5 billion.

The stock fell about 10%.

Two of the most important companies in AI infrastructure reported 24 hours apart and said the same thing. Demand is not the constraint. Supply and capacity are. Nvidia is prepaying for it. Marvell plans roughly 1 billion dollars in supplier capacity prepayments this fiscal year for exactly the same reason.

The margin story, read properly

Here is the part the headlines skipped. The quarter’s non GAAP gross margin of 58.9% came in slightly above the midpoint of guidance. The company did not miss on margin. What spooked the market is the forward band, which sits below trailing levels because the revenue mix is shifting toward custom silicon.

Custom silicon carries a lower gross margin than merchant silicon. That is simply true. But it also carries scale, multi year design win visibility, and customer lock in that merchant parts never provide. Marvell is trading percentage points of gross margin for a much larger and much stickier revenue base, and management guided fiscal 2028 operating expenses to grow at roughly half the rate of revenue, pushing operating margin toward the upper end of its 38 to 40 percent target.

Lower gross margin, higher operating margin, far more revenue. That is not deterioration. That is a business model choice, and the market priced it as a warning.

And then there is the agreement almost nobody led with. Marvell disclosed an expanded commercial arrangement with a Tier 1 hyperscaler covering custom AI inference accelerators, storage controllers, network interface cards and memory interface controllers, with potential revenue of approximately 120 billion dollars over six and a half years if all milestones are met.

What can break this trade

So this is a name to size deliberately rather than aggressively. A stock that just moved 10% on a guidance nuance can move 10% again on the next one. Position size is the risk control here, and the stop is not optional.