Super Micro stock jumps 17% on $4B sales forecast hike, analysts stay cautious

Super Micro Computer stock rose up to 17% in after-hours trading Tuesday after the AI server maker raised its quarterly sales forecast by $4 billion, though analysts remain cautious about sustainability. The company now expects revenue of $18.5 billion to $19.5 billion for the September quarter, up from prior guidance of $14.5 billion to $15.5 billion, with gross margins improving to 12%–12.5%. The upgrade reflects stronger AI platform demand and better product mix. Analysts question whether exceptional server sales can convert into durable cash generation, as the company used about $6.81 billion in operating cash flow during fiscal 2026. Full results due November 3 will test the rally, with one customer accounting for 28.1% of revenue.