Anthropic S-1

As filed with the Securities and Exchange Commission on October 26, 2026. Registration No. 333-          UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Anthropic, PBC (Exact name of registrant as specified in its charter) Delaware737286-1696045(State or other jurisdiction ofincorporation or organization)(Primary Standard IndustrialClassification Code Nu