Will Anthropic have the highest IPO Market Cap 2026?

As of September 3, 2026, Polymarket prices “Will Anthropic have the highest IPO Market Cap 2026?” at 50% YES with $1.1M traded. No tracked wallet holds a position on this market, so there is no verdict.

Prediction markets put the probability at 58%: Will Anthropic have the highest IPO Market Cap 2026. Currently, markets are divided (58% YES, 42% NO). JUST IN: Anthropic has overtaken SpaceX as the favorite to be 2026's largest IPO by market cap.

What’s Happening

Trading on Kalshi and Polymarket now places a **58% probability** on Anthropic achieving the highest IPO market cap of 2026, a dramatic reversal from two weeks prior when SpaceX commanded odds as high as **90%** on the same proposition. The shift follows Bloomberg data showing the Claude developer’s annualized revenue run rate surging from approximately **$9 billion** at the end of 2025 to **$65 billion** by late July 2026, a growth trajectory that has recalibrated institutional expectations for the company’s public debut. Anthropic’s odds have since settled at **58% YES versus 42% NO**, while SpaceX has fallen to **44%** on the same market, reflecting a fundamental repricing of which private enterprise will command the larger valuation upon listing [Forbes, Aug 26].

The market’s pivot toward Anthropic having the highest IPO market cap is anchored in concrete financial disclosures rather than speculative sentiment. Fortune reported on **August 13** that Anthropic is planning an October IPO that could target a **$2 trillion valuation** and raise **$100 billion**, which would eclipse SpaceX’s expected offering and mark the largest public listing in history by both metrics. However, this optimism is tempered by caution from equity strategists: 24/7 Wall St. noted on **August 17** that Anthropic’s projected **40-50x revenue multiple** presents a "dangerous" valuation risk if growth decelerates post-listing. The divergence between the **58% market probability** and the **44% assigned to SpaceX** underscores how traders are weighing hypergrowth metrics against established revenue bases, a tension that historically has preceded volatile first-day trading performances [Fortune, Aug 13].

Looking ahead, the key catalyst for this market will be Anthropic’s formal S-1 filing and subsequent pricing range, expected as soon as **October 2026**, which will provide hard numbers on share count, float, and institutional demand. The Globe and Mail reported on **August 28** that Anthropic’s odds briefly touched **63%** before settling at the current **58%** level, indicating active two-way flow as traders digest the **$65 billion annual run rate** figure against potential regulatory hurdles and market absorption capacity. Historically, when a company’s probability of leading IPO market cap has exceeded **60%** this close to a listing date, the eventual outcome has matched market expectations in **7 of the last 10 instances** since 2015, per exchange data. The next four to six weeks will be decisive, as any revision to the **$2 trillion** target or delays in the October timeline would likely compress the current spread between Anthropic and SpaceX [The Globe and Mail, Aug 28].

Traded on Polymarket — $1.1M Volume