Biggest Private Companies
The ten most valuable companies you can't buy yet — ranked by estimated valuation. The ones to watch for a future IPO.
Estimates, as of July 2026. Unlike the live prices elsewhere on the site, private valuations aren't traded on an exchange — they come from the latest funding round or secondary-market marks, sources disagree, and they move quickly. Figures are approximate and for education only. Primary source: stockanalysis.com/private.
The AI takeover
Two AI labs top the list — Anthropic and OpenAI alone are worth more than the other eight combined. A decade ago this ranking was fintech, social, and e-commerce.Maker of the Claude models — now the most valuable private company on earth, ahead of OpenAI.
ChatGPT's parent; a for-profit arm under a nonprofit, with a deep Microsoft partnership.
TikTok's owner — the largest non-AI private company, perennially entangled in U.S. policy.
Payments infrastructure for much of the internet. A long-rumoured IPO that keeps not happening.
Enterprise data + AI platform; has openly signalled it is preparing for public markets.
Jeff Bezos's rocket company — the private space race continues even after SpaceX went public.
Alphabet's self-driving unit; a majority-owned subsidiary rather than a pure standalone.
Alipay's operator, whose record 2020 IPO was pulled at the last minute by regulators.
Europe's most valuable fintech; frequently named as a marquee future listing.
Fast-fashion giant that has attempted listings in several markets amid scrutiny.
Why you can't buy them
These companies raise money privately — from venture funds, sovereign wealth, and insiders — so their shares aren't listed on any exchange. Ordinary investors generally can't buy in until the company goes public (an IPO) or is acquired. Watching this list is really watching the IPO pipeline.
When one goes public
An IPO is not automatically a buy — newly listed stocks are often priced for perfection and swing hard early on. SpaceX left this list when it IPO'd in June 2026. Our guide to IPO investing covers how to think about them.
Educational information, not investment advice. Valuations are third-party estimates and change frequently — verify current figures before relying on them.