Warren Buffett bought Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) about 60 years ago. Given his impressive track record, I steadily study Buffett's mentality to improve my own investing skills. My office is littered with highlighted and underlined copies of his annual letters to shareholders as well as worn-out books on Buffett.

Warren Buffett is arguably the world’s most famous investor, and his investment moves are closely followed. Each quarter, the company he runs, Berkshire Hathaway, discloses its current holdings to shareholders.

The world’s most famous value investor is sitting on an enormous cash pile. Warren Buffett’s conglomerate Berkshire Hathaway currently holds more than $325 billion in cash and equivalents, according to the firm’s quarterly financial statements, most of it in U.S. Treasury bills.