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 (iBillionaire.me) 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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