Supermicro's sales quadruple to a record US$19.9bn, but margins thin and cash flows out

When you ask an AI chatbot a question, the answer is worked out on a server in a data centre somewhere. A growing share of those servers come from Supermicro, the company that turns Nvidia’s AI chips into ready-to-run machines and full racks. On Tuesday it reported the biggest quarter in its history.

The Supermicro earnings for the three months to 30 September showed net sales of US$19.9 billion, up from US$5.0 billion a year earlier. That is roughly four times as much in one year. Supermicro sits in the middle of the AI building boom, so its order book is one of the clearest signs of whether companies are still spending on AI computing. For now, they are. But one line in the release matters as much as the headline: the figures are preliminary and unaudited.

A record Supermicro Q1, and a bigger target for the year

Analysts had expected about US$16.26 billion, according to Investing.com. On 20 October, Supermicro had already raised its own estimate to US$18.5 billion to US$19.5 billion, citing higher demand for AI platforms. The final number came in above even that range.

Net income was about US$1.59 billion, against US$168 million a year earlier. For investors who follow SMCI earnings (SMCI is its share symbol), adjusted profit was US$1.81 a share, ahead of the US$1.23 analysts expected.

The outlook is just as large. For October to December, Supermicro expects sales of US$19.5 billion to US$21.5 billion. For its year to June 2027, it now expects US$72 billion to US$82 billion, up from US$65 billion to US$72 billion in August. Analysts had expected about US$70.27 billion. For scale, sales for the whole of the last financial year were US$39.1 billion.

“Supermicro’s transformation into a Total AI and IT Datacenter Solution provider continues to accelerate,” said chief executive Charles Liang. The shares rose about 6% in after-hours trading on 3 November, ahead of the evening earnings call.

Thinner margins, and cash going out the door

Here is the harder part. Gross margin is what a company keeps from each dollar of sales after paying for what it sold. Supermicro’s was 12.7%, down from 17.5% in the previous quarter, though up from 9.3% a year ago. In plain terms, it kept about 13 cents of each dollar before other costs.

The business also used US$434 million of cash in its day-to-day operations. Its stock of parts and unsold systems rose to about US$15.05 billion, from US$12.90 billion in June. Money owed by customers jumped to US$9.69 billion, from US$6.13 billion. One helpful sign: customers paid more upfront. Payments for work not yet delivered rose to US$4.33 billion, from US$1.58 billion. At 30 September, it held US$6.9 billion in cash against US$8.6 billion of bank debt and convertible notes.

In practice, very large rack deals for a few giant buyers usually bring big sales but slim margins, because those buyers can bargain hard. The release itself warns that its customer base “may become more concentrated”.

Why “preliminary” matters in these Supermicro earnings

The release says the numbers are unaudited, that closing work for the quarter is “not yet complete”, and that its auditor has not reviewed them. They could still change.

Recent history adds weight to that. After the March 2026 indictment of three people then linked to Supermicro (two employees and a contractor), its board reviewed certain export-control-related transactions. It warned the outcome could affect its forecasts and preliminary results. On 20 August, the company said the independent investigation was complete and that it is strengthening export compliance.

What the boom means for AI users and Super Micro stock holders

If you use AI tools, this is a sign that more computing capacity is coming. Supermicro is one of the main ways cloud firms and smaller “neocloud” providers get Nvidia chips running. It is not the only supplier: AMD’s Helios racks are part of the same wave.

If you own or follow Super Micro stock, the lesson is simple: record sales are not the same as healthy cash. Watch the gross margin, the cash used in operations and the final filed numbers, not just the revenue line.

On balance, a strong order book on a thin cushion

The good news is real. Demand beat the company’s own raised estimate, the full-year target went up again, and customers are paying in advance. The concern is real too. Margins fell from last quarter, cash flowed out, debt is larger than cash, and the numbers are not yet final. On balance, this reads as a business growing faster than its cushion. That is not a crisis, but it leaves little room for error.

The next test is plain. When Supermicro files its final quarterly report, do the numbers hold, and does the margin stop sliding?