After weeks of leaked S-1s, Anthropic finally filed for an initial public offering on Monday, setting the stage for one of the most closely watched public debuts in modern U.S. history. 

Anthropic, which plans to list under the ticker “ANT,” recorded revenue of $16.3 billion for the first half of 2026, up from $1.2 billion in the same period last year, according to the firm’s latest SEC filing.