Marvell at 25.1 times sales not ready for AI slowdown

Marvell Technology's business is heavily concentrated in data centers, which accounted for 79% of fiscal Q2 2027 revenue. On the August 27, 2026 earnings call, management forecast roughly $18 billion in fiscal 2028 revenue, up from about $12 billion expected for fiscal 2027, with data center revenue growing more than 60% in fiscal 2028. That outlook depends on continued AI demand, and a September 28, 2026 news report tied a fall in Marvell and other AI stocks to OpenAI saying it had halted training of its latest AI models.

The stock has more than tripled in twelve months, and at 25.1 times trailing sales it prices in growth Marvell has not yet delivered. If the latest quarter's revenue repeated four times, annual revenue would be about $11.0 billion, below the roughly $12 billion management expects for fiscal 2027. Profit on that basis would be $1.2 billion a year, leaving the stock at about 190 times that profit. Marvell does have a cushion: $1.7 billion of free cash flow in the past twelve months against $1.0 billion of net debt, so a slowdown would likely hit the share price well before it threatened debt payments. The 2025 tariff shock, when Marvell fell 55% from peak to trough against 19% for the S&P 500, shows how sharply the stock can react to a shock, though that episode does not tell us how an AI demand slowdown would play out.

The next hard evidence is Marvell's fiscal Q3 2027 revenue against the $3.15 billion guide, plus or minus 5%, and the Investor Day on October 6, where repeating the roughly $18 billion fiscal 2028 outlook would signal no slowdown. The stakes hinge on whether data center growth holds up; if it does not, the valuation leaves little room for error.