Shares were mixed in thin Asian trading on Monday after U.S. stocks edged back from their all-time high. Oil prices fell and U.S. futures sank, while Chinese shares shed some of their early gains after a survey of manufacturers showed export orders dropping to a five-month low.

Warren Buffett is considered one of the greatest investors in American history. Under his leadership, Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) shares have returned approximately 5,500,000% since the mid-1960s,

Here’s a surprising new fact about the world’s largest and most-liquid public equity market: Most of the activity on it isn’t public anymore.