Anthropic Moves Toward Public Markets as S-1 Filing Expected, Fable 5.5 Rumored This Week

Anthropic is poised for a critical week in its path to becoming a public company, with anticipation mounting around the long-awaited SEC S-1 filing and whispers of a new flagship model release. The AI safety company confidentially submitted its draft registration statement to the U.S. Securities and Exchange Commission on June 1, 2026, at a reported $965 billion valuation with $47 billion in annual revenue. As of mid-October, the public S-1 filing—required on SEC EDGAR before formal investor roadshows can begin—has not yet appeared, but regulatory timelines suggest publication imminently, likely by late October, to support a mid-November IPO launch targeting a Nasdaq listing.