Pronóstico: Largest IPO by market cap in 2026?

Platform comparison

Market context

SpaceX has already executed the largest IPO in history, pricing at a $1.77 trillion valuation after raising $75 billion on its first trading day in 2026, shattering the previous record held by Saudi Aramco in 2019[1][7]. This historic milestone frames how traders should interpret the current market for the largest IPO of 2026, as no other company has yet approached this scale[1]. With 79 IPOs completed so far this year and June being the busiest month with 17 listings, the market is saturated with activity, yet SpaceX remains the undisputed benchmark for market capitalisation[2].

For traders monitoring this contract on Polymarket, the key catalysts are the upcoming jumbo-sized IPOs expected to price in the autumn, including OpenAI and Anthropic, which could challenge SpaceX’s dominance if they achieve higher valuations[5][6]. US volume is likely to surge as these high-profile deals move forward, with General Atlantic noting that a series of major IPOs are anticipated in the fall[5]. Traders should watch for official pricing announcements and regulatory approvals, as these dependencies will determine whether any new entrant can surpass SpaceX’s $1.77 trillion market cap[1]. The on-chain mechanics, including USDC settlement on Polygon and conditional tokens, ensure transparent resolution once the final closing price is confirmed[4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Qué Es. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Qué Es trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.