Prediction Markets Now Expect AI Start-Up Anthropic to Unseat SpaceX as the Largest IPO in 2026

SpaceX raised $85.7B in its IPO, nearly tripling the prior largest-ever IPO cash raise, but Polymarket assigns a 63% chance that AI startup Anthropic will surpass SpaceX as 2026’s largest IPO. Anthropic’s estimated valuation target is up to ~$2T, even as its run-rate sales are cited by Bloomberg as jumping from ~$9B (end-2025) to ~$65B by end-July. The article cautions that chasing hot tech-driven IPOs has historically produced large retail drawdowns (average year-one max drawdown ~55%), citing SpaceX’s peak-to-trough drawdown of ~54% so far.

Analysis

The market is treating this as a referendum on private AI valuation, but the more important mechanism is capital formation: every new mega-round or IPO at a richer multiple raises the reservation price for adjacent late-stage AI assets and keeps the cost of capital artificially low for another 1-2 quarters. That tends to help the infrastructure owners of AI demand more than the model vendors themselves, because cloud and GPU spend can compound even when equity multiples eventually compress.

Near term, the tape risk is not fundamental failure but supply exhaustion: post-IPO enthusiasm usually peaks before the first meaningful insider monetization window and then mean-reverts once the market has to digest actual float. The vulnerable setup is days to 3 months after listing; the structural risk is 6-18 months later if revenue quality proves more concentrated or more usage-sensitive than the headline run-rate implies.

Contrarian view: the consensus is over-fixated on whether a private company is "too expensive" and underweight on the fact that strategic holders can use a public currency to finance compute, hiring, and distribution. What would invalidate the bearish read is a combination of sustained customer expansion, improving gross margins, and no deceleration in AI infrastructure demand; absent that, the current enthusiasm looks like a liquidity event, not a durable re-rating.

Key Decisions for Investors

• SPCX: avoid chasing strength; if borrow/liquidity is workable, short into post-debut rallies for a 1-3 month mean-reversion trade. Use a tight stop above the recent high; thesis breaks if the first earnings/filing shows no slowdown in revenue quality or if insider supply is clearly absorbed.
• Pair trade: long NVDA / short SPCX over 3-6 months. NVDA benefits from continued AI capex regardless of private-market sentiment, while SPCX is exposed to valuation compression if the IPO window cools. Best entry is after a euphoric open or analyst upgrade cycle.
• Watch AMZN, GOOGL, MSFT as indirect beneficiaries rather than immediate trades. If the IPO frenzy keeps pushing AI spending higher, these names monetize the buildout with lower financing risk; prefer adding on any broad AI selloff rather than buying the new issue.
• If trading options, use put spreads on SPCX rather than outright puts: the setup is a volatility fade after the initial pop, but a sustained retail squeeze can keep implied vol elevated. Reassess after 30-45 days or on the first post-IPO supply event.