Prediction markets put the probability at 74%: Will Anthropic IPO by October 31, 2026. Currently, markets see this as likely (74% YES). The Polymarket event "Anthropic IPO by \_\_?" currently prices year-end 2026 as more likely than not.
As of August 18, 2026, Polymarket traders have priced the probability of an Anthropic IPO by October 31 at 74%, a sharp upward revision from 62% on July 16 and 36.5% on July 20. The contract for the December 31, 2026 deadline trades at 85%, while shorter windows have collapsed: September 30 sits at 11% and September 15 at just 2%, down 33% week-over-week. This concentration of probability in the late-October window follows Anthropic's confidential IPO filing with the SEC on June 1, 2026, and reflects market expectations that the company will complete its roadshow and pricing within a narrow 60-day launch corridor. The market has seen $1.61 million in cumulative volume with $327,720 in open interest, indicating active institutional hedging activity around the October date. [CryptoSlate, Aug 18]
The October 31 deadline has become the pivotal reference point for investors tracking the AI capital markets cycle, particularly after the June 30, 2026 contract resolved NO and the July 31 line traded at just 0.7%. The probability of an Anthropic IPO by October 31 has risen 27% since mid-July, when the same contract was priced at $0.365. This repricing aligns with broader market dynamics: OpenAI's IPO timeline has reportedly slipped, with betting markets assigning only a 13% probability to an OpenAI listing before year-end versus 87% for Anthropic. The divergence suggests capital is rotating toward Anthropic as the first major AI lab to test public market appetite, a scenario that last occurred when C3.ai debuted in December 2020 and subsequently triggered a wave of AI-related filings. [24/7 Wall St., Jul 07]
Trading activity has intensified following Anthropic's official confirmation of its confidential filing, with the probability of an Anthropic IPO by October 31 climbing from 69.5% on August 17 to the current 74% level. The market's implied timeline suggests investors expect the company to leverage the post-Labor Day window, a period historically favorable for tech listings given clearer Q3 earnings visibility. However, the steep drop-off in probabilities for earlier dates — September 30 at 11% and September 15 at 2% — indicates traders view any October launch as contingent on final SEC comment resolution and market conditions remaining stable through the Federal Reserve's September meeting. The year-end contract at 85% provides a ceiling for the October bet, implying a roughly 11% probability that the listing slips into November or December. No official date has been communicated by the company, leaving the October 31 window as the market's primary liquidity event for AI equity exposure in 2026. [Cointribune, Aug 17]
Polymarket prices this at 74c YES with $491K in volume. Moderate liquidity — use limit orders for positions above $1K to avoid moving the price.
Smart money positioned NO.
We tracked 1 wallet with positions above $1K on this market.
| Wallet | Category | Side | Amount | P&L | |
|---|---|---|---|---|---|
| 0x7c3d..6b | MM | YES | $1.7K | +44% |
YES wallets entered between 45c. At current price 74c, all YES holders are profitable while all NO buyers are underwater. Profitable positions rarely sell early — YES side has structural price support.
Polymarket prices YES at 74c with $491K in total volume. Our model estimates fair value at 74c. Model and market are aligned — no pricing discrepancy detected.
| Platform | YES Price | Volume |
|---|---|---|
| Polymarket | 74c | $491K |
| Our Model | 74c | — |