According to CNBC, Anthropic unveiled its Form S-1 filing with the SEC Monday, and traders on prediction market Kalshi put 95% odds on the company officially announcing an initial public offering by the end of 2026. Kalshi defines an official IPO announcement as the SEC declaring an S-1 effective, a priced IPO or an exchange assigning the stock a ticker. Anthropic’s filing lists “ANT” as its envisioned Nasdaq Stock Market ticker. Anthropic is aiming to begin trading the week of Nov. 16, according to a Wall Street Journal report; Kalshi traders assigned a 14% chance to trading beginning before then. On Polymarket, traders put the odds of Anthropic listing and beginning public trading by Nov. 20 at 69%.