✦ Maia and the Fiscal 2028 Step-UpNarrow moat

Marvell's guidance for a significant increase in custom accelerator revenue in fiscal 2028 is tied substantially to the ramp of Microsoft's next-generation Maia part¹, which Marvell is designing. Custom silicon at roughly $1.5 billion today is expected to grow in fiscal 2027 and potentially double in fiscal 2028 as new hyperscaler programs reach volume.

This is the clearest, most datable bet on the page, and it is also the most concentrated. A single customer's product schedule is now a material input into a company valued at roughly eighty-seven times earnings — and hyperscaler silicon roadmaps slip, get re-scoped, or get split between suppliers with little warning to the market.

Microsoft is, at least, an unusually good counterparty: it has committed publicly to its own accelerator line, it has the capital to see it through, and it has a strategic reason to reduce dependence on Nvidia that does not disappear if AI spending moderates. Watch quarterly custom-silicon revenue against the doubling implied for fiscal 2028, and watch for any language change about program timing. In this business the warning arrives as a vague sentence on an earnings call, not as an announcement.