Anthropic IPO by __ Odds & Analysis
Anthropic's plan to go public is one of the most closely watched prediction markets of 2026, and the timeline has moved a lot since the summer. As of late October 2026, the Anthropic IPO odds put a listing by December 31, 2026 at 76.5%, by November 30 at 63.5% and by November 25 at 56%. The October 31 contract, which was the consensus target in June, has collapsed to 0.3%. The confidential draft S-1 that Anthropic submitted on June 1 still has not appeared publicly on EDGAR, the original October target has slipped, and current reporting points to a roadshow starting the week of November 9 with trading before Thanksgiving. PredMart offers leveraged exposure to these deadline contracts, but the real story is the timeline itself.
The market is a ladder of deadline contracts. Every rung that has already passed - June 30, July 31, September 15, September 30 and October 15 - resolved NO, and most of the remaining probability is now packed into a narrow window between November 16 and November 30. The next two to three weeks decide whether that window holds or the whole board shifts into December and January.
Where the Anthropic IPO odds stand in late October 2026
When will Anthropic IPO? The live deadline ladder answers that question as follows (YES prices, with the change over the past week where available):
- By October 31, 2026: 0.3%
- By November 15, 2026: 1.7% (down about 2 points)
- By November 20, 2026: 25.5%
- By November 25, 2026: 56%
- By November 30, 2026: 63.5% (up 8 points)
- By December 15, 2026: 73.5% (up 8.5 points)
- By December 31, 2026: 76.5% (up 5 points)
Because each rung includes every earlier date, the differences between them give an implied distribution for the listing date. The market assigns almost nothing to a listing before November 16, about 24% to November 16-20, about 30% to November 21-25, about 7.5% to November 26-30, about 10% to December 1-15, about 3% to the second half of December, and about 23.5% to no listing in 2026 at all.
A companion month market tells the same story from a different angle: November 2026 trades at 64%, December at 14.4%, January 2027 at 11.4%, and every later month in 2027 at 2.5% or less. A separate contract on Anthropic not going public before 2028 trades at just 0.7%, and the market on whether Anthropic or OpenAI lists first gives Anthropic about 95%. In other words, traders are not debating whether Anthropic goes public. They are debating which week.
The thin November 26-30 bucket is not an accident. US exchanges are closed on Thanksgiving, November 26, and close early on November 27, while November 28-29 is a weekend. That leaves very few realistic listing days between the November 25 and November 30 rungs, which is why the market treats "before Thanksgiving" and "by November 30" as nearly the same question.
What happened since the June filing
In June the picture looked simple. Anthropic had closed a $65 billion Series H at a $965 billion post-money valuation in late May, announced its confidential draft registration statement on June 1, and the working assumption was an October listing. The September contracts were trading in the 7-25% range on hopes of a compressed SEC review. None of that played out.
The slide came in steps. Reuters reported on September 5 that formal marketing could start in mid-October at the earliest, with a listing days before the US midterms. The Wall Street Journal later reported the target had moved from October to November. Bloomberg and Business Insider reported on September 13 that Anthropic had picked Nasdaq, which neither company confirmed. The September 15, September 30 and October 15 rungs all expired worthless, and the October 31 contract, near 50% in June, now sits at 0.3%.
Details of the draft prospectus started to leak in late September. Fortune and Reuters reported 2025 revenue of roughly $4.6 billion against a net loss of about $42 billion, most of it non-cash charges tied to convertible financing, and very large multi-year compute commitments. The Wall Street Journal separately reported first-half 2026 revenue of $16.3 billion, up from about $1.1 billion a year earlier. None of these figures will be official until the public S-1 lands.
October brought the pre-marketing phase. Bloomberg reported on October 1 that Anthropic had invited select institutional investors to meet executives, followed by an investor meeting at its San Francisco headquarters around October 14. Bloomberg has named Morgan Stanley, Goldman Sachs, JPMorgan and Citigroup as banks on the deal. CNN reported on October 5 that the IPO could still come as soon as November despite worries about an AI slowdown, and CNBC wrote on October 19 that Anthropic is the AI trade's last big hope for a major IPO this year, with OpenAI not expected to list in 2026.
The most recent reporting is the most important for the ladder. Reuters reported on October 22 that Anthropic is pressing ahead with a potential mid-November listing, with the formal roadshow possibly starting the week of November 9, and Bloomberg has reported trading could begin before Thanksgiving. Valuation talk has also cooled: October coverage discussed a range starting around $1.5 trillion, below the $2 trillion-plus figures floated earlier in the year. Several outlets reported that the public S-1 could appear as early as Friday, October 23. As of October 24 there is no confirmed public filing.
The 15-day rule and the November ladder
The single most useful piece of IPO mechanics for this market is the SEC requirement that a confidentially filed company make its registration statement public at least 15 calendar days before launching the roadshow. Working backward from a roadshow that opens on Monday, November 9, the public filing has to land by about October 23-25, and since October 25 is a Sunday, the practical deadline was Friday, October 23.
That is why the November 20 and November 25 rungs are the most sensitive contracts on the board. A typical roadshow runs about a week and a half before pricing, so a November 9 launch points to pricing around November 18-24 and first trades just before Thanksgiving, exactly where the market has put most of its probability. If the public filing slips by a week, the roadshow slips to the week of November 16, pricing moves toward the very end of November, and the holiday calendar makes a December listing more likely. The November 15 contract at 1.7% already reflects the fact that a listing in the first half of November is no longer mechanically possible.
These rungs can move tens of points on a single EDGAR filing or a single press report, and on leveraged positions that kind of jump hits both gains and drawdowns harder, so liquidation distance matters more than the headline probability.
December and the 2027 tail
The December 31 contract at 76.5% is the broadest bet on the board: it pays on any 2026 listing, whatever the week. The remaining 23.5% is the market's estimate that something pushes the deal into 2027, and there are several plausible reasons. The valuation reset from $2 trillion-plus talk to a range starting near $1.5 trillion could make insiders want to wait. Weakness in AI stocks, which CNN and CNBC both highlighted in October, could sour demand. The leaked loss figures and compute commitments invite tough questions on the roadshow. And the IPO window traditionally goes quiet from mid-December into the new year, so a slip past early December can easily become a slip into January.
The month market suggests most of that tail is a short delay rather than an abandoned deal. January 2027 alone trades at 11.4%, while February through December 2027 add only a few points combined and no IPO before 2028 sits at 0.7%. For a trader, the December rung pays less per dollar than the November ones but does not depend on getting the exact week right, which is the main thing to weigh when deciding how much leverage, if any, a position can carry.
What the valuation markets add
Related contracts show what traders expect once the deal prices. The IPO valuation market puts 55.8% on a $1.5-1.75 trillion valuation and 22% on $1.75-2.0 trillion, with about 3% on anything below $1.5 trillion. That matches the cooler October reporting. The closing market cap markets, which measure the value at the end of the first trading day, are noticeably higher: about 87% for a close above $1.5 trillion, 67.5% above $1.75 trillion and 36% above $2 trillion. Taken together, traders expect a pricing near the low end of the reported range followed by a first-day pop, a common pattern for heavily oversubscribed deals.
This matters for the timing market because pricing and timing are linked. A deal that can only clear at a disappointing valuation is a deal that is more likely to be postponed. If the price range in the public S-1 lands well below what the valuation markets expect, the December and January buckets should gain at the expense of the November rungs.
Catalysts: the dated events that will move the board
The Anthropic IPO market will reprice on a short list of discrete events over the next five weeks.
The public S-1 is the first and biggest. Several outlets reported it could appear as early as October 23; until it shows up on EDGAR, every day of delay chips away at the November 20 and November 25 rungs. The filing will make the financials, risk factors and share structure official, and a later amendment will add the proposed price range, which is the key input for the valuation markets.
The November 3 US midterm elections fall just before the reported roadshow window. Reuters had originally reported a listing before the midterms; the current plan puts the marketing after them, so election-week market volatility is a background risk rather than a scheduling conflict.
The week of November 9 is the reported roadshow launch, per Bloomberg and Reuters. A launch that week, usually signaled by a price-range filing, would make a pre-Thanksgiving listing the clear base case. Coverage of order-book demand during the roadshow will move the valuation contracts as much as the timing ones.
Pricing and first trade would follow around November 18-25 on the reported schedule. Markets are closed on November 26 and close early on November 27, so a deal that misses the pre-Thanksgiving window most likely lists in the first half of December, where the December 15 contract at 73.5% captures it.
December 31 is the final backstop for the 2026 ladder. If Anthropic has not listed by then, every remaining 2026 rung resolves NO, and the month market's January 2027 contract becomes the front-runner.
How the ladder fits together
Because every contract asks whether Anthropic lists by a given date, the rungs are tightly correlated: if November 20 resolves YES, every later rung does too, and if December 31 resolves NO, every rung does. A position on December 31 is implicitly long on all earlier dates, while a position on November 20 is a narrow bet that the reported schedule runs without a single week of slippage.
That structure lets traders separate two questions that are easy to blur. The first is whether the deal happens in 2026 at all, which the December 31 rung prices at 76.5%. The second is whether the reported schedule holds, which the spread between November 25 (56%) and December 31 is effectively pricing at about 20 points. Most of the news flow in the coming weeks will move that second number far more than the first.
Bottom line
The Anthropic IPO odds now describe a deal that is very likely to happen but has already missed one target date. The market's base case is a listing in the week before Thanksgiving, with 56% by November 25, a meaningful chance of a short slip into December, and roughly a one-in-four chance the deal spills into 2027, most likely January. The single most important signal is the public S-1: if it appears on EDGAR in the coming days and a roadshow launches the week of November 9, the November 20 and November 25 rungs should firm up sharply, while a filing that drifts into November would push probability toward the December and January buckets.
Prediction markets themselves do not offer leverage, and PredMart adds up to 4x on these contracts for traders who want sized exposure to a specific rung of the ladder.
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