Kalshi odds of an Anthropic IPO confirmation before Nov. 16 jump to 17 cents
Kalshi's "before Nov. 16" Anthropic IPO contract rose from 1 cent to 17 cents Thursday night, on about 174,600 contracts traded in 24 hours.
The “Before Nov 16, 2026” contract in Kalshi’s “When will Anthropic officially announce an IPO?” event jumped from 1 cent to 17 cents on Thursday night. As of 11:13 p.m. ET on Thursday, Nov. 12, Kalshi’s market data showed a last trade of 17 cents, against a previous-day price of 1 cent, with the best bid at 15 cents and the best ask at 17 cents. About 174,600 contracts changed hands in the 24 hours to that time, and open interest stood near 710,600 contracts.
When the price moved
Kalshi’s hourly price history shows the contract pinned at 1 cent for most of Wednesday and Thursday. The climb started in the hour to 8 p.m. ET Thursday, when it closed at 5 cents. In the hour to 9 p.m. ET it traded as high as 32 cents before closing at 18 cents. The next hour swung between 2 cents and 30 cents and closed at 16 cents, and the hour to 11 p.m. ET closed at 18 cents. Those four hours alone carried about 140,900 contracts.
Anthropic’s filing list on the SEC’s EDGAR system shows no new filing between 6:08 a.m. ET on Thursday and the jump. No opened record explains the timing, so this story does not assign one.
What counts as “officially announce”
The contract’s name is broader than its rules. The rules say the market resolves Yes “If Anthropic confirms an IPO before Nov 16, 2026.” They define that narrowly: “An IPO is confirmed if 1) the SEC declares the company’s Form S-1 effective OR 2) the IPO is priced OR 3) a securities exchange has assigned a ticker to it. As long as any of those events occur, the market will immediately resolve to Yes, even if the company does not start trading until after Nov 16, 2026.” The contract closes at 11:59 p.m. ET on Sunday, Nov. 15.
Filing for the IPO does not appear on that list. Anthropic filed its S-1 on Oct. 26 and its second amendment on Nov. 10, which EDGAR accepted at 6:29 a.m. ET. That amendment offers 825,000,000 Class A shares at an estimated $70 to $78 each and says Anthropic has “applied to list” on the Nasdaq Global Select Market under the symbol “ANT.” The Nov. 16 contract traded no higher than 3 cents through the two days after that filing.
Anthropic’s filed timetable gives later dates. A free writing prospectus accepted by EDGAR at 8:35 p.m. ET on Nov. 10 reproduces Anthropic’s IPO website, which states: “Subject to regulatory clearance, the final IPO share price is expected to be set on November 18th (EST), and shares are expected to begin publicly trading on November 19th (EST).” A European retail prospectus filed Thursday morning puts the end of the offer period and the underwriting agreement on or about Nov. 18. Pricing is one of the three triggers in Kalshi’s rules; SEC effectiveness and an exchange-assigned ticker are the other two, and the filings cited here give no date for either.
The rest of the ladder
The later dates in the same event trade at 98 to 99 cents. As of the same check, “Before Nov 20, 2026” last traded at 98 cents, up from 93 cents, on about 27,600 contracts in 24 hours. “Before Dec 1, 2026” stood at 98 cents and “Before Jan 1, 2027” at 99 cents. The contract dated Nov. 1 has already settled.
Polymarket lists a similar ladder with a different test. Its “Anthropic IPO by __?” event resolves Yes only if Anthropic shares are “listed on a public securities exchange and open for trading” by the date. As of about 11:14 p.m. ET Thursday, the Nov. 15 rung sat at about 0.1 cents on about $19,800 of 24-hour volume, while the Nov. 19 rung stood near 96 cents on about $65,800. The two platforms are asking different questions: Kalshi’s earlier contract can pay on effectiveness, pricing or a ticker assignment, while Polymarket’s waits for the shares to be listed and open for trading.
Traders on Polymarket have also been repricing Anthropic’s debut market cap, with the $1.25 trillion to $1.5 trillion bracket leading that event as of Nov. 11.
Our AI news desk researched and wrote this article, and software checked every factual sentence against the records it links to, following the WriterOps methodology. Report an error.