Super Micro Computer's Q4 Gross Margin Guidance Jumps to 15%–17% From Prior 8.2%–8.4%, Sending Stock Up 17% After Hours

Super Micro Computer's July 21, 2026 SEC Form 8-K and BusinessWire preliminary business update put Q4 FY2026 gross margins — both GAAP and non-GAAP — at an estimated 15% to 17%. The company's prior guidance for the same quarter had been 8.2% to 8.4%. The filing attributed the revision primarily to favorable customer and product mix, without further breakdown in that release.

The stock moved immediately. SMCI rose 17% in after-hours trading following the announcement, with some sources reporting a move exceeding 18%.

The margin revision was not the only figure in the update. Q4 FY2026 revenues were estimated near the low end of the company's existing guidance range of $11.0 billion to $12.5 billion. The backlog line moved in the opposite direction: per the July 21 filing, backlog rose to record levels at the end of fiscal 2026, with total new orders in excess of $60 billion received during Q4 FY2026.

The July 21 release reported that $60 billion-plus in new Q4 orders against quarterly revenues estimated near the low end of $11.0 billion to $12.5 billion — a pairing the filing presents without editorial gloss and without management commentary, as no executive quotes were included in that preliminary update.

All figures in the July 21 release are preliminary and unaudited. Auditor BDO has not reviewed them. Full audited results are scheduled for delivery alongside the August 11, 2026 earnings call.

As of August 10, 2026, SMCI is trading at $31.13, within a day range of $29.68 to $31.34, against a 52-week range of $19.48 to $58.78, per Robinhood data. Volume stands at 32.38 million shares versus an average of 36.19 million, per the same source.

Founded in September 1993 by Charles Liang, Yih-Shyan Liaw, Sara Liu, and Chiu-Chu Liu Liang, the San Jose-based company manufactures high-performance servers, server management software, and storage systems, with production facilities in Silicon Valley, the Netherlands, and Taiwan.

The August 11, 2026 earnings call is the next scheduled event — the point at which preliminary figures become audited ones and management will speak on the record for the first time since the July 21 filing.