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Warren Buffett started buying Berkshire Hathaway (BRK-A) shares in 1962. Back then shares were less than $10 and Buffett himself was a mere millionaire. Since then, Berkshire shares have grown massively as Buffett turned Berkshire into the world's largest holding company with shares that sell for more than $400,000.

The Oracle of Omaha, as many refer to Buffett, is now worth more than $100 billion according to Bloomberg’s Billionaire index. Recent stock purchases over the last 15 years have helped Buffett’s wealth massively increase. A five-billion purchase of Bank of America (BAC) in 2011, buying Apple (AAPL) in 2016 and more recently piling into oil company’s Chevron (CVX) and Occidental Petroleum (OXY).

Above, Yahoo Finance's Josh Schafer breaks down Buffett's recent string of investments that boosted his net worth.

Key video takeaways:

• 0:30 Buffett's net worth

• 0:45 Buffett's top buys

• 1:28 How Buffett