When Will Anthropic List? What the Polymarket Anthropic IPO Odds Say Now
Anthropic did not list in October 2026, and the market now prices a debut in mid-to-late November. On November 5, 2026, the Polymarket Anthropic IPO odds put a listing by November 20 at 63%, by November 30 at about 84% and by December 31 at about 91%, with November 15 under 2%.
Key Takeaways
- October 2026 ended with no listing, as the arithmetic said it would: the public S-1 landed on October 26, and the SEC's 15-day rule put the earliest roadshow on November 10.
- Polymarket's "Anthropic IPO by…" ladder on November 5, 2026: by November 20 at 63%, by November 25 and by November 30 at about 84%, and by December 31 at about 91%, with November 15 under 2%.
- Amendment No. 1 to the S-1, filed November 2, 2026 with third-quarter results, still left the price range blank, so the ladder is still pricing a roadshow that has not been announced.
- Polymarket's original first-day market cap market resolved "No IPO by June 30, 2026"; its replacement, which runs to December 31, 2027, put 53% on a close of $1.8 trillion or more on November 5, against a last private valuation of $965 billion.
- Kalshi's Anthropic IPO market asks when Anthropic will officially announce an IPO, not when ANT starts trading, so it is not a listing-date market.
Did Anthropic List in October? No, and Here Is Why
No, Anthropic did not list in October 2026, for two reasons that never depended on any rumor.
First, the public S-1 was filed on October 26, and the SEC's expanded draft registration procedures require a company that used confidential review to file publicly at least 15 days before its roadshow, which puts the earliest roadshow on November 10.
Pricing follows the roadshow and trading follows pricing, so there was no sequence of events that could end with ANT trading before October 31.
Second, Polymarket agreed: the "by October 31" contract was priced at under 1% on October 29, down from roughly 56% in mid-September.
October 31 has now passed with no listing, so that contract can only resolve No, and the live rungs of the ladder start in mid-November.
Anthropic's own filing announcement confirms the Nasdaq application and the ANT symbol and gives no timeline.
Amendment No. 1, filed November 2, 2026, added third-quarter results but still no price range, which leaves the second half of November as the live question.
What Are the Polymarket Odds for the Anthropic IPO?
The Polymarket odds for the Anthropic IPO on November 5, 2026 put the most likely listing window between November 19 and November 25, with the biggest jumps between November 18 and November 20 and again into November 24.
| Listed and trading by | October 29, 2026 | November 5, 2026 |
|---|---|---|
| October 31 | Under 1% | Passed, no listing |
| November 15 | 2% | Under 2% |
| November 16 | 8% | 8% |
| November 17 | 13% | 9% |
| November 18 | 29% | 23% |
| November 19 | 42% | 42% |
| November 20 | 61% | 63% |
| November 23 | 63% | 65% |
| November 24 | 72% | 79% |
| November 25 | 79% | 84% |
| November 30 | 88% | About 84% |
| December 15 | 93% | 89% |
| December 31 | 95% | About 91% |
The November 5 figures are a snapshot from the Polymarket market page, where the November 30 rung showed a headline 83%, and they move daily.
Each rung is a separate yes/no contract, so a price of 63 cents on "by November 20" means traders with money at risk put roughly a 63% probability on ANT being listed and trading by the end of that day.
The resolution rule is strict: the shares have to be listed on a public exchange and open for trading by 11:59 p.m. ET on the named date, and a filing, a roadshow or a priced-but-untraded deal does not count.
The public S-1 repriced the whole ladder: before October 26 traders were guessing when the filing would land, and after it they were pricing a known roadshow floor.
Polymarket's implied probability of an Anthropic listing by each date, November 5, 2026 snapshot.
What Moved Between October 29 and November 5
Between this page's October 29 and November 5 readings, the weight shifted toward November 24 and November 25, while the later rungs slipped by a few points.
The November 24 rung rose from 72% to 79% and the November 25 rung from 79% to 84%, which is what a roadshow starting on or just after November 10 and running for about two weeks implies.
The year-end rung fell from 95% to about 91%, so traders now put a little more weight on the listing slipping past December 31, 2026, though most of the money still bets on November.
The Date Ladder and the Roadshow
The jump from under 2% on November 15 to 63% on November 20 reflects how quickly a roadshow starting around November 10 could price.
SpaceX went from public filing on May 20, 2026 to pricing on June 11, a 22-day gap, with its roadshow unable to start before June 4; a similar gap for Anthropic points to pricing around November 17 and a first trade in the days after.
The Motley Fool reported on October 29 that marketing could begin the week of November 9, with a debut in mid-to-late November, which matches where the ladder puts its weight.
Prices on a ladder should rise with the date, and a reversal between two rungs is noise from thin trading rather than information.
The confirmed and expected steps behind the ladder are laid out in the confirmed IPO timeline.
Anthropic IPO Closing Market Cap Market
Polymarket's "Anthropic IPO closing market cap" market asks a different question: not when ANT lists, but what the company is worth at the close of its first trading day.
A first-day closing market cap is the closing share price multiplied by the shares outstanding after the offering, so the market is a bet on the IPO valuation plus the first-day move.
The first version of this market, with brackets topping out at $600 billion or more, ended on June 29, 2026 and resolved "No IPO by June 30, 2026," as its market page shows.
Two replacement markets now run to December 31, 2027, and on November 5, 2026 the Middle Brackets market priced the outcomes as follows.
| First-day closing market cap | Price on November 5, 2026 |
|---|---|
| Below $0.6 trillion | 2% |
| $0.6 trillion to $0.9 trillion | 2% |
| $0.9 trillion to $1.2 trillion | 13% |
| $1.2 trillion to $1.5 trillion | 18% |
| $1.5 trillion to $1.8 trillion | 27% |
| $1.8 trillion or more | 53% |
| No IPO by December 31, 2027 | 3% |
The prices add up to well over 100%, a sign of thin trading, so read them as a ranking of outcomes rather than exact probabilities.
The companion Lower Brackets market prices a first-day close of $600 billion or more at about 98%.
Most of the weight sits above $1.2 trillion, well above the $965 billion the company confirmed in May 2026, and the top bracket sits above the $1.4 trillion to $1.5 trillion that investors had indicated, according to Bloomberg.
None of it is a company disclosure, and the price range in a further amended S-1 is the first number that will test it.
How a private valuation becomes a public one, and why the two differ, is covered in the guide to Anthropic's valuation.
Where traders put Anthropic's first-day closing market value in Polymarket's Middle Brackets market, November 5, 2026 snapshot; the last private valuation was 965 billion dollars.
How Is the Kalshi Anthropic IPO Market Different?
The Kalshi Anthropic IPO market asks when Anthropic will officially announce an IPO, not when ANT lists, so it measures a different event from Polymarket's ladder.
The series "When will Anthropic officially announce an IPO?" (KXIPOANTHROPIC-DATE) resolves Yes only on a defined trigger such as SEC effectiveness, pricing or an exchange assigning a ticker, and a public S-1 by itself is not on that list, which is why the contracts stayed open after the October 26 filing.
On November 5, 2026, the Kalshi market page priced "before December 1, 2026" at around 88%, but its own figures did not line up: the same contract was displayed at 95%, and "before January 1, 2027" traded no higher, so treat the number as approximate.
Kalshi's December 1 contract and Polymarket's November 30 rung both point to the end of November as the base case, but one prices an announcement and the other a first trade, so the two numbers should not be compared point for point.
Why Did the September Odds Get October Wrong?
The September odds got October wrong because they assumed a public filing by early October, and the filing landed on October 26.
On September 16 this page recorded Polymarket's "by October 31" contract near 56% and Kalshi's "before November 1" contract near 73%, both resting on reports that marketing would start in mid-October.
The 15-day rule turned the October 26 filing date into a November 10 roadshow floor, and every October contract fell to under 1% once the filing date was known.
The lesson is mechanical: the public S-1 date plus 15 days is the hard floor for the roadshow, a typical one-to-two-week roadshow gives the earliest first trade, and the EDGAR timestamp is the only variable that matters.
Two markets got it right, on readings recorded on October 27: the ordering market, which priced Anthropic listing before OpenAI in the mid-90s in September and about 96% after the filing, and the ticker market, where $ANT went from 72% on October 23 to 99% on October 27 once the filing named it.
Does a Public Filing Mean Anthropic Is Going Public?
Not by itself: a public filing means two of five steps are complete, and three remain: an amended filing with the price range, the roadshow, and pricing followed by the first trade.
Amendment No. 1, filed on November 2, 2026, added third-quarter results but left the price range blank, so the amended-filing step is still open.
The filing is marked "subject to completion," and Anthropic's June notice made the offering conditional on market conditions and other factors.
Companies have filed publicly and then waited months or withdrawn, which is why the market cap market carries a "No IPO by December 31, 2027" outcome at about 3%.
How to Read an Anthropic IPO Prediction Market Price
A prediction market price is an implied probability for the event as the contract defines it, so the resolution rule is the first thing to read.
- Read the rule: "listed and trading" on Polymarket and "officially announced" on Kalshi are different events, which is why their prices differ.
- Check the volume: the whole Polymarket date ladder carried about $6.3 million of volume on November 5, 2026, and thin rungs with little liquidity move on small trades.
- Add Yes and No: if the two prices sum to more than $1, the gap is market-maker margin, and the midpoint is the better estimate.
The basics of how these contracts work are in the guide to how a prediction market works.
What Is Actually Confirmed About the Anthropic IPO?
Six things are confirmed by the company or the filings, and four are not.
- Confirmed: a public S-1 on EDGAR dated October 26, 2026; Amendment No. 1 (Form S-1/A) filed November 2, 2026; an application to list on the Nasdaq Global Select Market under ANT; a 22-bank syndicate led by Goldman Sachs and Morgan Stanley; first-half 2026 revenue of $16.29 billion and a net loss of $80.7 billion; a last private valuation of $965 billion from May 28, 2026.
- Not confirmed: the listing date, the price range, the share count and the IPO valuation.
Amendment No. 1 added the third quarter: revenue of $16.96 billion, up about 47% from the second quarter, and a GAAP operating loss of $567 million after an operating profit in the second quarter, as broken down in Anthropic's Q3 2026 results.
The market cap brackets are bets on the last of those, and the date ladder is a bet on the first.
Are Prediction Markets Actually Accurate?
Prediction markets are better than polls and worse than documents.
A University of Iowa study of electronic markets found the market closer to the final result than polls about three-quarters of the time across five presidential elections, with the edge largest far from the event.
Wolfers and Zitzewitz's 2006 paper shows that a contract price approximates the average belief of traders with money at risk.
Neither finding means a market can know a date that depends on an unpublished filing, and the Anthropic record shows it: the ordering market was right early and stayed right, while the month market was a coin flip until the filing resolved it.
Is Betting on the Timing the Same as Owning Anthropic?
No, a prediction contract pays a fixed amount if an event occurs and gives no exposure to Anthropic's value.
A pre-IPO perpetual such as the ANTHROPICUSDT contract on MEXC tracks expected valuation continuously and converts into a standard stock futures contract when ANT lists, and neither it nor a prediction contract conveys shares, votes or dividends.
MEXC's Prediction Markets product offers event contracts of its own, and their resolution terms deserve the same reading as Polymarket's and Kalshi's.
The Anthropic Pre-IPO Countdown page on MEXC tracks the milestones these markets are pricing, from the amended filing to the first trade.
How Often Do These Odds Change?
Daily, and sometimes hourly around a filing: every current figure on this page is a November 5, 2026 snapshot, and the ticker market moved from 72% to 99% in the four days around the S-1.
The next large moves will come with the further amended S-1 that carries the price range and with the start of the roadshow.
Frequently Asked Questions
What are the current Polymarket odds for an Anthropic IPO?
On November 5, 2026: 63% by November 20, about 84% by November 25 and by November 30, and about 91% by December 31, with November 15 under 2%.
What is the Anthropic IPO date on Polymarket?
Polymarket sets no single date, but on November 5, 2026 its ladder first rose above 50% on the November 20 rung, at 63%.
Did Anthropic list in October 2026?
No, October 2026 ended with no listing, as the October 26 filing date and the 15-day rule implied, and Polymarket now prices a listing in mid-to-late November.
What is the Anthropic IPO closing market cap market?
A Polymarket bracket market on Anthropic's market value at the close of its first trading day; the original version resolved "No IPO by June 30, 2026," and the current Middle Brackets market put 53% on $1.8 trillion or more on November 5, 2026.
What does the Kalshi Anthropic IPO market measure?
When Anthropic will officially announce an IPO, not when ANT starts trading, and on November 5, 2026 its page priced "before December 1, 2026" at around 88%, though the page's own figures were inconsistent.
Is Anthropic publicly traded yet?
No, as of November 5, 2026 the S-1 of October 26 and Amendment No. 1 of November 2 are public, and ANT trades only after pricing.
What is Anthropic's ticker?
ANT, per the Nasdaq Global Select Market application in the S-1.
Does the public S-1 settle these markets?
No, Polymarket needs the shares to be trading, and Kalshi needs effectiveness, pricing or a ticker assignment.
Will Anthropic or OpenAI list first?
Anthropic, which has a public S-1 while OpenAI has only a confidential draft and is reported to be leaning toward 2027, and Polymarket's ordering market priced it at about 96% after the filing.
What does a price of 63 cents mean?
Roughly a 63% probability that the event happens as the contract defines it, in this case ANT trading by the end of November 20.
Does the market cap market pay out if there is no IPO?
Yes, in one bracket only: the "No IPO by December 31, 2027" outcome, priced at about 3% on November 5, 2026, pays out if ANT has not listed by then.
How much money is in these markets?
On November 5, 2026, the Polymarket date ladder carried about $6.3 million of volume and the two closing market cap markets about $617,000 and $535,000, while Kalshi's announce series carried about $4.8 million.
Conclusion
October ended with no listing, as the filing date plus the 15-day rule implied, and on November 5, 2026 the Polymarket Anthropic IPO odds stood at 63% by November 20 and about 84% by November 30, with $1.8 trillion or more as the most likely first-day market value.
Read every rung by its resolution rule, treat the market cap brackets as opinion with money behind it, and remember that none of these contracts puts ANT shares in your account.
The routes that give exposure before the listing are compared in the guide to buying Anthropic stock before the IPO.
Trading crypto assets is high-risk; prices can be highly volatile and you may lose everything you put in. No security measure removes all risk, and MEXC does not promise principal protection or absolute security. This article is not investment advice.
More Anthropic Guides
- When Is the Anthropic IPO? Anthropic IPO Date, Plans and Status for 2026
- Is Anthropic Stock Public Yet? Does Anthropic Have a Stock, Ticker ANT and How to Buy
- Where Is Anthropic's S-1? Inside the Anthropic IPO Filing and Its November 2026 Amendment
- Anthropic IPO Prospectus Explained: What the S-1 Reveals About Revenue, Losses, Control and Risks
- Anthropic IPO News 2026: Latest on the S-1 Amendment, Ticker ANT and Listing Date
- Anthropic Q3 2026 Results: $16.96 Billion in Revenue, a $567 Million Operating Loss, and What It Means for the IPO
- Is Anthropic Profitable? Annual Revenue, Q3 2026 Losses and Cash Burn Explained
- Anthropic IPO Valuation: From $965 Billion to a Reported $1.5 Trillion, Every Round and Who Owns What
- Can You Buy Anthropic Stock Before the IPO? Three Routes Compared
- Can You Get Anthropic Shares at the IPO Price? How to Buy the Anthropic IPO From Anywhere
- Anthropic vs OpenAI IPO: Anthropic Lists First — What's Confirmed and What's Still Rumor
- Can You Still Get In Early? SpaceX, OpenAI, Anthropic and Databricks IPO Plans 2026
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