Anthropic IPO Below $1.25T? Volume Doubles as Investors Balk at $1.5T

Whether Anthropic's IPO closes below a $1.25 trillion market cap is an open question, and trading on that scenario doubled on Nov. 5. The <$1.25T bracket in the Anthropic IPO Closing Market Cap market traded $152,420 across 2,234 trades on the latest completed UTC day, against a prior seven-day average of $72,956 per day. That is 2.09x the baseline, a lift of about $79,464.

The surge landed the same day the WSJ reported institutional investors pushing back on a $1.5T valuation after a Nasdaq rout. The bracket's implied probability rose from about 11% to 13% over 24 hours, a market price rather than a forecast. The sources do not establish who traded or in which direction.

How the <$1.25T Bracket's Daily Volume Compares With Its Own History

The method is simple. The baseline is the average of the seven completed days before Nov. 5: roughly $510,691 in total volume divided by 7, or $72,956. The multiplier divides Nov. 5's $152,420 by that average, producing 2.09x. Partial-day trading and isolated hourly bursts are excluded.

The limits matter. Observed history spans only 29 days, which is not the market's age, so this article does not call Nov. 5 a record. All of the day's recorded volume ran through Polymarket. Dollar volume shows participation; it cannot reveal trader identity, conviction, or whether the money bought YES or NO beyond what the 2-point price change implies.

Why Did Trading Volume Rise in the <$1.25T Bracket?

The most direct driver is a Nov. 5 WSJ report, summarized by [Investing.com](https://www.investing.com/news/stock-market-news/anthropic-faces-valuation-pushback-on-15t-ipo-following-market-rout-wsj-reports-5006085), that institutional investors are steering the valuation toward $1.5T to $1.6T, with one suggesting about $1T. That lone $1T figure sits below the $1.25T threshold this bracket tracks.

The same report tied the pushback to a Nasdaq session that erased about $2.5T amid an AI selloff and political backlash against data centers. Anthropic had targeted a pre-Thanksgiving offering raising up to $100B, and executives planned to reassess pricing or timing.

The valuation debate was already cooling. Aswath Damodaran trimmed his equity estimate to $1.45T on Nov. 4 and flagged the "fragility" of the revenue target, per [Yahoo Finance](https://finance.yahoo.com/markets/stocks/articles/dean-valuation-aswath-damodaran-trims-090204116.html). Anthropic's updated S-1 disclosed a Q3 net loss of about $23.3B, roughly $895B in spending commitments, and $146.6B in cash, according to [Yahoo Finance](https://finance.yahoo.com/technology/ai/articles/anthropic-updates-ipo-filing-investors-034041239.html). In October, [Reuters](https://www.investing.com/news/stock-market-news/exclusiveinvestors-temper-anthropic-ipo-valuation-expectations-over-revenue-growth-slowdown-sources-say-4952698) reported investors discussing about $1.5T, down from about $2T, as quarter-over-quarter revenue growth slowed to about 45% from 144%.

Timing supports an attention explanation but cannot prove why anyone traded.

Market landscape: outcomes and contracts

The <$1.25T contract priced at 13% on Nov. 6 on both Polymarket and Predictfun, so the cross-venue spread is effectively flat. Prices for the other valuation brackets are not in the supplied data. The contract resolves on Anthropic's IPO closing market cap, with a resolution date of Jan. 1, 2028. For live prices across every bracket, see the [Anthropic IPO closing market cap odds page](/odds/anthropic-ipo-closing-market-cap/54430).

What Could Keep <$1.25T Volume Elevated or Let It Fade

- **A formal pricing or timing change.** Anthropic's reported reassessment is the clearest pending decision; a delay past the pre-Thanksgiving window or a cut in the target would directly test this bracket. - **More detail on the $1T suggestion.** Further reporting on how many investors back sub-$1.25T pricing would bear on the bracket. - **The Nasdaq's next sessions.** A continued AI selloff keeps the rout narrative alive; a recovery weakens it.

If none of these materialize and markets stabilize, volume has room to drift back toward the roughly $73,000 daily baseline.