Anthropic: The 5 Most Important Things Investors Need to Know from Its IPO Filing

Anthropic filed its initial S-1 registration statement on Oct. 26, giving investors important insight into one of the year's most anticipated IPOs. The stock will trade on the Nasdaq under the ticker symbol ANT.

While the filing did not list a proposed stock price or how many shares will be sold, the IPO is expected to rival that of SpaceX's and be valued between $1.5 trillion and $2 trillion.

Let's look at five important things from Anthropic's filing that every investor should know before considering buying the stock when it debuts.

1. Booming revenue growth

When it comes to a growth stock like Anthropic, the biggest focus is on revenue growth. That will ultimately be one of the biggest factors that determines whether the stock will become a long-term winner.

For the first half of 2026, Anthropic grew its revenue an astonishing 1,304% to $16.29 billion, up from $1.16 billion a year ago. For 2025, its revenue climbed 1,089% to $4.59 billion. For the second quarter, it said its revenue surged 1,368%. That's huge growth and one of the reasons why the company is poised to debut at such a high valuation.

Meanwhile, the company's existing customers continue to spend more. Its net revenue retention was a remarkable 900% as of the end of September, showing how useful customers find its AI models.

However, investors were disappointed when Anthropic management reportedly told investors earlier this month that its Q3 revenue would come in at $16.8 billion. That was a material sequential slowdown, as it was its Q2 revenue surged to $11.6 billion from $4.7 billion in Q1.

2. A diversified customer base

Perhaps one of the most surprising things for Anthropic's prospectus is how diversified its customer base is. Typically, you would expect such a young company to be heavily reliant on just a few large customers, but that is not the case.

The AI company said that no single customer accounted for more than 10% of its revenue over the first nine months of the year. Meanwhile, its top-five customers accounted for roughly 25% of its revenue.

Meanwhile, nearly half its revenue (48%) came from cloud computing providers that offer its models.

3. Widening losses are not what they seem

During the first half of the year, Anthropic lost a whopping $80.7 billion, much worse than the $12.9 billion loss it posted in the same period in 2025. However, this number is actually very misleading.

The vast majority of these losses were paper losses related to the change in value of its convertible notes. As the AI lab's value rose with additional funding rounds, so did the value of its convertible notes, which are listed as liabilities on its balance sheet. This led to around $72 billion in non-cash accounting losses. Excluding those $72 billion in charges, its loss would have been around $8.7 billion.

Note that when Anthropic goes public, these convertible notes will be converted to stock, eliminating its liability.

4. Big spending ahead

Anthropic's prospectus also revealed that the company has a boatload of future spending commitments spread out among various companies for computing power.

It has agreed to spend $114.5 billion with Alphabet for access to compute power between April 2026 and July 2033, while it's also committed to buy TPUs (tensor processing units) to be delivered between 2028 and 2031 worth between $125 billion and $150 billion. Meanwhile, it will spend at least $110 billion with Amazon and $44.9 billion with Microsoft. All these commitments are regardless of actual usage.

It has also agreed to spend $120.5 billion with SpaceX through 2029. After non-cancellable periods ending in January and March 2027, either party can cancel the agreement after 90 days' written notice. It also listed a $44.6 billion deal with NScale for access to compute powered by Nvidia GPUs, and a $41.3 billion deal with Lambda.

5. Operating leverage is key

While Anthropic continues to spend aggressively on computing capacity, it is beginning to show signs of solid operating leverage. In Q2, its revenue surged 1,368% year over year while compute and infrastructure expenses grew by a much more modest 300%. This helped Anthropic flip to an adjusted operating profit for the quarter.

As a scale business, continuing to expand margins on inference will be key to Anthropic being a solidly profitable business over the long term. Fortunately, it is showing nice early signs of just this.

Geoffrey Seiler has positions in Alphabet and Amazon. The Motley Fool has positions in and recommends Alphabet, Amazon, Microsoft, and Nvidia. The Motley Fool has a disclosure policy.