Anthropic, the company behind the Claude AI models, has brought Citigroup into its IPO preparations, adding another heavyweight to a banking syndicate that already includes Morgan Stanley, Goldman Sachs, and JPMorgan Chase.
The company filed a confidential S-1 with the SEC on June 1, 2026, officially setting the IPO machinery in motion. With a post-money valuation of $965B from its Series H funding round, Anthropic is positioning itself for a Nasdaq listing that could arrive as soon as October 2026.
A very crowded bank bench
Morgan Stanley and Goldman Sachs are leading the underwriting effort. JPMorgan Chase is also part of the syndicate. Citigroup has joined the conversation, having already participated in Anthropic’s existing revolving credit facility.
That credit facility is itself expanding. Anthropic is seeking billions in additional capital to shore up its liquidity before going public.
Investor meetings kicked off in July 2026, suggesting that Anthropic’s leadership team is already making the rounds with institutional investors.
The $965B question
At $965B post-money, Anthropic would enter the public markets at a level that puts it in the neighborhood of the world’s most valuable companies. It’s a staggering number for a company that was founded in 2021.
Anthropic’s decision to expand its credit facility before listing is a pragmatic one. Companies that go public with ample liquidity have more flexibility to invest in growth without immediately diluting new shareholders.
The October 2026 timeline, if it holds, would place the IPO in what is traditionally one of the busier windows for new listings.
If Anthropic does price its IPO near the implied $965B valuation, it would rank among the largest technology IPOs ever.