Anthropic S-1 Excludes Co-founder Ben Mann from Founder LLC; Company Says He Is Still Fairly Called a Co-founder

In its Form S-1 registration statement filed with the U.S. Securities and Exchange Commission (SEC) on October 26, 2026, American AI company Anthropic explicitly excluded Benjamin Mann from its "Continuing Founders" and "Founder LLC" in a footnote on page 248. This means Mann will not participate in determining how Class F common stock is voted and is not part of the cohort of seven founders who jointly control more than 50.1% of shareholder voting power.

This disclosure contrasts with the company's recent public statements. Just two weeks prior, on October 14, Anthropic announced the opening of its first Singapore office and referred to Mann as "cofounder Ben Mann." An Anthropic spokesperson confirmed on Monday that there have been no changes to Mann’s role and stated, "it’s still fair to refer to him as a cofounder."

Ann Lipton, a professor at University of Colorado Law School, noted that while "Founder" is not a strict legal term, the S-1 footnote clarifies the boundaries of Mann's governance rights: he does not have continuing governance rights in the firm, though his economic rights, such as share percentage, remain unknown. Lipton suggested this may be an intentional legal distinction to separate factual founders from those defined as having governance control, aiming to avoid confusion for investors.