If you owned a $1,000 stake in Berkshire Hathaway when Warren Buffett became the company's CEO more than a half-century ago and held on to your position, you would now own stock worth roughly $22.6 million. While matching that kind of incredible performance over the next 50-plus years is likely out of reach due to the investment conglomerate's already massive size, the company's performance under Buffett's tenure should make it clear why the famous investor is sometimes referred to as the Oracle of Omaha. Berkshire Hathaway's investment portfolio continues to reflect Buffett's focus on high-quality companies that are built to perform over the long term, and it's little wonder that investors around the world continue to look to him for guidance on market-beating stock plays.