The numbers
TSMC filed its September 2026 revenue report on 8 October. Consolidated net revenue for the month was NT$511,857 million — about NT$511.86 billion — against NT$330,980 million in September 2025. That is growth of 54.6% year on year.
Against August 2026, when the company reported NT$514,806 million, September was down 0.6%. Revenue for January through September 2026 reached NT$3,898.73 billion, up 41.1% on the same period a year earlier.
Why flat matters more than fast
The year-on-year figure is the headline, and it is the AI build-out in one line: demand for accelerator silicon has added more than half again to what the world’s most important foundry billed a year ago.
The month-on-month figure is the more informative one. September is essentially level with August, and August was essentially level with the months before it. A company growing 55% a year that is not growing month to month is a company running at capacity, where output is set by how much it can make rather than by how much anybody wants to buy.
The nine-month line is the steadier one
Monthly foundry revenue is noisy — it moves with when wafers finish, when customers take delivery and how many working days a month has. The nine-month figure smooths that out, and it says 41.1% growth against the same stretch of 2025.
That is slower than the September year-on-year rate, which is the shape you would expect if the acceleration happened earlier in the year and the business has since settled into a high, steady run rate. It also means the comparison base is now high: holding 55% growth into 2027 requires capacity that does not exist yet.
What the filing does not say
This is a monthly revenue disclosure, not an earnings release. It carries no margins, no mix by node or by customer, and no guidance. It does not break out how much of the money came from advanced packaging, which is the step that has been limiting AI accelerator output, or from leading-edge logic.
Anyone attributing the whole 54.6% to AI is inferring it. The filing states a total.
What to watch
TSMC’s quarterly earnings call, where the mix and the margins appear. And whether the monthly line starts moving again, because that is the first place new capacity shows up. Until then the sector’s constraint is not demand, and a flat month at a 55% annual growth rate is the clearest evidence of it.
