Anthropic’s filing sets a ceiling of ¥552.9 billion, or about $3.5 billion, for shares it plans to offer Japanese investors in its proposed U.S. IPO.
What the Japanese offer covers
The Japanese portion is a cap, not a promise that all the shares will be sold, and it does not show the size or valuation of the overall IPO. The shares will be newly issued, with proceeds going to Anthropic for working capital, operating expenses and capital spending. The company plans to list on Nasdaq under the symbol ANT, but has not set the share count or price range. Its registration statement is not yet effective.
The offer is one way to buy into a U.S.-listed company, not a separate Japanese listing. Bloomberg reports that investors in Australia, Canada and parts of Europe will also be able to buy shares. Mizuho Securities will manage the Japanese portion, with other banks handling orders. A wider buyer base could help test demand, but the filing does not say this is why Anthropic set the Japanese cap.
Why Anthropic needs capital
Founded in 2021 by researchers who left OpenAI, Anthropic sells Claude models and related services, including to businesses. Its public filing showed revenue of $16.29 billion in the first half of 2026, up from $1.16 billion in the same period a year earlier. Building and running advanced models requires substantial computing and infrastructure. Reuters reported that the prospectus disclosed hundreds of billions of dollars in long-term commitments for cloud, computing and infrastructure.
Anthropic recorded an $80.7 billion net loss in the first half of 2026. Reuters reported that about $72 billion came from a change in the estimated value of financing instruments that could convert into shares, not an equivalent cash loss from running the business. The company still needs to show that demand can grow enough, and margins can hold up, to support its computing costs.
Why Japan may attract the offer
Bloomberg reported that only 32 companies made first-time offerings in Japan through September, the lowest nine-month total since 2012. The report linked the slowdown to a shortage of AI-related listings and tougher Tokyo Stock Exchange rules for companies seeking to stay on its startup market. A high-profile foreign AI listing gives local investors access to a type of growth company they may not find in Japan’s domestic IPO market.
There is evidence of investor interest, but it does not show whether Anthropic’s offer will be fully taken up. At SpaceX’s June IPO, Japanese investors received $2.2 billion of shares from a $75 billion offering. Reuters separately reported that investors in Japan had been willing to subscribe for more than $6.2 billion, mostly from retail buyers. That precedent does not predict how investors will respond to Anthropic’s price.
What investors still need to weigh
Investors could gain exposure to a fast-growing AI business, but risk paying a price that assumes growth continues while computing costs rise. Anthropic said it had more than 11,900 business customers spending at least $100,000 over the prior year. CNBC reported that five customers accounted for about a quarter of revenue during the first nine months of 2026. Some investors have discussed a valuation around $1.5 trillion, but that figure is not in the Japanese filing.
Anthropic still needs to settle the offering’s size, price and share count, complete regulatory review, and gather orders. The shares cannot be sold under the U.S. filing until its registration statement becomes effective. The Japanese cap shows the scale of access Anthropic is preparing to offer, not how much it has raised or what Claude’s business is worth.