Anthropic insiders may sell up to 10% of locked-up shares on IPO day

Anthropic's draft S-1 reportedly pairs a small first-day insider sale window with longer lockups on everything else Anthropic ’s IPO paperwork reportedly includes an unusual perk for some insiders. Certain shareholders may be able to sell up to 10% of their locked-up shares on the very first day of trading. The AI company behind the Claude models submitted a draft Form S-1 registration to the SEC on June 1, 2026. An S-1 is the formal document a company files before selling shares to the public. According to reports on the filing, some insiders could unload up to 10% of their locked-up holdings when the stock debuts. That provision reportedly comes paired with longer-than-usual lockup agreements on the remaining shares.

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