Anthropic’s SEC Form S-1 filing on October 26, 2026, explicitly names the Nasdaq Global Select Market ticker ANT for its planned Class A shares, establishing the dominant driver behind the 98.2% market-implied probability. Trader consensus reflects the direct regulatory confirmation following the company’s confidential June submission, with revenue surging to $16.3 billion in the first half of 2026 and an expected mid-November listing. Minor alternatives such as ANTH or CLAU originated from pre-filing speculation but lack supporting documentation. While the filing’s clarity creates high certainty, last-minute exchange conflicts or amendments remain theoretically possible ahead of pricing, though no such developments have surfaced in recent updates.