Anthropic Leads 2026 IPO Announcement Market With 75% Odds

Anthropic led Kalshi’s 2026 initial public offering (IPO) announcement market at 75% on Oct. 19, the only company above 50% among 23 companies whose contracts remained open to trade. The market counts three events as a formal announcement: the SEC declares a company’s Form S-1 effective, the offering is priced or an exchange assigns the shares a ticker. Anthropic confidentially filed a prospectus with the SEC in early June, but that filing alone does not meet the contract’s stated threshold. The Oct. 19 Kalshi figure concerns the contract’s formal announcement milestones. It does not establish a listing date. OpenAI’s 2026 contract stood at 3%. OpenAI CEO Sam Altman ruled out going public in 2026 in September.

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