Anthropic’s public S-1 filing on October 26, 2026, and the start of formal marketing the week of November 9 have driven the 83.3% market-implied probability for a November IPO. The company reported $16.3 billion in first-half revenue—up sharply year-over-year—along with its first quarterly operating profit, bolstering confidence in its large language model business and enterprise traction for Claude. With a 22-bank syndicate targeting a potential record raise before the Thanksgiving holiday window closes, traders see limited scope for slippage. Any delays from market volatility or final pricing negotiations could shift the outcome, though the current timeline keeps November as the clear front-runner.