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.

The latest Berkshire Hathaway 13F filing came out last week detailing the holding company's buys and sells, and there were a few surprises. Warren Buffett waded into Pool Corporation (NASDAQ: POOL) and munched on Domino's Pizza (NYSE: DPZ) for the first time.

Following the release of Berkshire's latest Form 13F, five unstoppable stocks account for 65% ($191.3 billion) of the $293 billion investment portfolio Buffett oversees.