Anthropic's amended IPO filing shows $567m operating loss on $16.96bn revenue

The amended filing leaves investors to weigh $895.4bn of committed compute against revenue that ran at $35.28bn over the past four quarters. Neither the final valuation nor the share count has been set.

What the amended filing added

The amended S-1 added the third-quarter results. They were missing from the prospectus published a week earlier. Revenue for the three months to 30 September was $16.96bn. That is about 12 times the roughly $1.4bn booked a year earlier.

Growth slowed sharply. Price cuts and contractual discounts trimmed about $600m from the quarter's revenue gain. Operating expenses rose $6.94bn, outpacing the $5.40bn increase in revenue. The operating line swung to a $567m loss from a $974m profit in the second quarter. Adjusted operating income strips out stock-based pay and donation charges. It rose to $2.46bn from $2.24bn, but the adjusted margin fell to 15% from 19%.

The $23.3bn loss is mostly accounting

The third-quarter net loss was $23.29bn, up from $12.1bn a year earlier and below the $66.3bn loss in the second quarter. Almost all of it is accounting. The filing attributed $21.94bn, or 94.2%, of the loss to fair-value changes on convertible notes and related instruments; Memeburn calculated that about $22.7bn of the loss sat below the operating line. Amazon holds most of the notes. Anthropic revalues them every quarter. The value rises with the company's valuation, and Anthropic books the change as a loss. The notes convert into shares at listing. That largely removes the effect.

The nine-month net loss was $104bn, against $25.1bn in the same stretch of 2025. Revenue was $33.24bn, up roughly 1,200%. That is more than seven times the $4.6bn Anthropic booked for all of 2025, Memeburn calculated.

Commitments against revenue

Purchase and lease commitments total about $895.4bn. Substantially all of it is for compute and infrastructure, and the number includes agreements signed after 30 September. About $69.8bn falls due within 12 months. That is nearly double the $35.28bn of revenue Anthropic booked over the past four quarters. Around $448bn is due by the end of 2030.

The filing cites two main items behind the quarter's operating loss: $5.0bn of compute bought under short-term commitments, which costs significantly more than comparable capacity under multi-year deals, and $2.0bn of non-cash donation-matching charges.

Anthropic's own risk section says the capacity may not arrive. "Certain of our compute providers and infrastructure partners depend on third-party financing or credit support to acquire chips and develop capacity," the filing says. It warns that contracted capacity "may be delayed, repriced, reduced, or not delivered".

Margins already show the strain. Compute absorbed 58 cents of every revenue dollar in the third quarter, up from 48 cents. In the first half of 2026, gross margin was 85.4%, against 26.4% at Z.ai and 17.9% at MiniMax, according to Anthropic's prospectus and the two Hong Kong-listed companies' latest financial disclosures.

The valuation came down

Some current and prospective investors are discussing a valuation of about $1.5tn. That is down from roughly $2tn a week earlier, Reuters reported. The cut followed an October investor day that showed the slowdown.

The customer numbers are the counter-argument. Aswath Damodaran, analyzing the S-1, noted that enterprises spending more than $1m a year on Claude rose to 1,900 from fewer than 100 a year earlier, while the top five customers still account for 25% of revenue. Anthropic reported more than 11,900 customers generating at least $100,000 on a trailing 12-month basis as of 30 September.

What happens next

The filing confirms marketing can start as soon as 9 November and that Anthropic plans to list Class A shares on Nasdaq under the ticker ANT. Bloomberg reported the listing is expected before Thanksgiving; the company has not confirmed the timing.

TradingView reported that Anthropic is weighing a raise of $100bn or more. A Japanese securities filing on 2 November outlined an offering of about $3.5bn to Japanese investors, coordinated by Mizuho Securities. That filing did not disclose the total offering size or a final valuation.