NO on Anthropic confirms IPO (S-1 effective, priced, or ticker assigned) before Nov 1, 2026?

YES condition: for YES to pay, the SEC must declare Anthropic's S-1 effective, or the offering must price, or an exchange must assign a ticker, before Nov 1 04:59Z (Oct 31 midnight ET), resolved by Kalshi from SEC/exchange records. Prob: 11% pre-market → 10% final. Vehicle check: EDGAR full-text search and the current-filings feed show no S-1/S-1A by Anthropic through Sep 29; CNBC/Reuters (Sep 29) confirm the paperwork 'had still not been publicly disclosed' and the prospectus was 'seen by Reuters', i.e. leaked (Fortune, Sep 29). Calendar: the SEC's draft-registration policy requires the public flip ≥15 days before any roadshow, so a pricing before Oct 31 needs a public filing within days plus a compressed roadshow; Reuters (Sep 19, restated in its Sep 28 prospectus story) says the debut 'is likely to be pushed to after the November US midterm elections'; WSJ (Sep 18) reported the shift to November to fold in Q3 results. Cross-check: Polymarket 'Anthropic IPO by Oct 31' = 4.5% and 'IPO in October' = 3.9% ($24k/24h), versus Kalshi 20–21¢ after today's leak-driven spike (Kalshi sat at 5–6¢ Sep 20–28, at parity with Polymarket). Precedent (KXIPOANTHROPIC JUN01/JUL01, KXIPO SpaceX): 'filed' and 'confirmed' are months apart; a proposed symbol in a filing is not an assigned ticker; filing-adjacent headlines produce residue that decays. Cleanest tail: Anthropic publicly files this week and runs an accelerated roadshow to price Oct 27–30, before the midterms — a new discrete event (an EDGAR flip plus a roadshow launch) reversing the reported slippage, priced at ~10%. Resolver risk: −3 pts for any early Nasdaq 'ticker assignment' reading; the pick survives.