Private Companies

Q: How many private companies does Substox map?

18,431, which is most of the database. Private companies are harder to research precisely because they publish less, which is why the ownership links matter more here than anywhere else on the site.

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Private Companies

The brands not on the stock market

What You Can't Directly Invest In

Some of the most powerful companies on Earth are privately held — they don't trade on any exchange, and you can't buy their stock through a brokerage. Mars makes M&M's and owns most of pet care. Cargill is the largest privately held company in America. SpaceX dominates commercial spaceflight. IKEA furnishes apartments worldwide. OpenAI launched ChatGPT. Substox tracks 18,431 private companies and 83 nonprofits, and for each one, points to the publicly traded alternatives that can give you investment exposure.

Five Categories of Private Companies

Private Holding Companies

The largest privately held conglomerates — Mars, Koch Industries, Cargill, Hearst — that quietly run massive portfolios of consumer brands.

145 tracked

Non-Profit Organizations

Foundations, NGOs, and structurally non-investable entities — Wikimedia, Mozilla, the original OpenAI non-profit, the American Red Cross.

83 tracked

Going Private / Delisting

Companies that were publicly traded but were taken private through buyouts, acquisitions, or management-led delistings.

Explore delistings

Private Monopolies

The privately held companies that dominate entire industries — DJI in drones, the Big Four in accounting, Rolex in luxury watches.

View private monopolies

Unicorn Startups

High-growth private companies valued at $1B+. The next generation of public companies — and the names you'll see on IPO filings in years to come.

27 tracked

Questions people ask

Common Questions

Why can I not buy shares in some famous brands?

Plenty of household names are privately held, owned outright by a parent, or structured as co-operatives and foundations. In each case there are no shares trading on an exchange, so there is nothing for an ordinary investor to buy.

How many private companies does Substox map?

18,431, which is most of the database. Private companies are harder to research precisely because they publish less, which is why the ownership links matter more here than anywhere else on the site.

Can I get exposure to a private company at all?

Sometimes, indirectly. If a listed company owns a stake in it, or competes in the same market, buying that listed company gives you partial exposure. Each private company page points at the closest public alternatives.