Buffett was diagnosed with stage I prostate cancer during a routine checkup. He completed radiation treatment in September 2012, and his doctors expected him to make a full recovery.

Buffett and Bill Gates announced The Giving Pledge, a campaign to encourage other wealthy individuals to commit to giving at least half of their fortunes to philanthropy.

During the financial crisis, Buffett made notable investments in General Electric and Goldman Sachs, providing them with much-needed capital.

Warren Buffett announced his plans to give away his fortune, with a commitment to donate 85% of his Berkshire Hathaway shares to five foundations, the largest contribution going to the Bill & Melinda Gates Foundation. 

One of Buffett's most notable investments was in Coca-Cola Company, where Berkshire Hathaway bought a $1 billion stake, amounting to 6.3% of the company.

After disagreements with the management, Buffett took control of Berkshire Hathaway at a board meeting and immediately fired the then-president, Seabury Stanton.

Warren Buffett created the firm Buffett Partnership Ltd. in Omaha, using $100 to establish the partnership. This became the early entity through which Buffett managed investments.