If you’ve ever wondered what billionaires know that you don’t, their preferred stock is no longer one of those things. Fortune pulled together a chart of the top ten holdings of 21 billionaire investors, revealing that AAPL is their top holding.

What started as an iOS app (iBillionaire) and website ( morphed at the end of October into an exchange-traded fund (ETF) that offers investors a portfolio of 30 stocks selected to mirror the investment strategies of 21 billionaire investors — people like Warren Buffett, George Soros and Carl Icahn.

As Fortune‘s Philip Elmer-DeWitt cautions, however, the catch in attempting to follow their lead is you won’t know what they’ve bought or sold until after they’ve done it.

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About the Author

Ben Lovejoy

Ben Lovejoy is a British technology writer and EU Editor for 9to5Mac. He’s known for his op-eds and diary pieces, exploring his experience of Apple products over time, for a more rounded review. He also writes fiction, with two technothriller novels, a couple of SF shorts and a rom-com!

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