Largest IPO by market cap in 2026?

Largest IPO by market cap in 2026? is a finance prediction market asking which company will debut on a U.S. exchange in 2026 with the highest market capitalization on its first trading day. The forecast is based on the official closing share price multiplied by outstanding shares, with resolution tied to the primary exchange listing page and U.S. dollar conversion rules when needed. The market runs through December 31, 2026, so traders are effectively weighing which IPO candidate is most likely to enter public markets at the largest valuation. This matters because large IPOs often reflect investor appetite for major tech, AI, space, and business names, and the outcome could be shaped by companies linked in market discussion such as OpenAI, SpaceX, Sam Altman, Elon Musk, and broader Big Tech themes. As of now, no single probability is provided, but prediction market sentiment can still be inferred from volume, liquidity, and open interest. If two companies finish with the same market cap, the listing resolves alphabetically.