Warren Buffett acquired Berkshire Hathaway back in 1965. Over the first few decades of operation, the company soared in value. In the 1980s, for example, Berkshire stock rose in value by at least 30% most years, with annual returns reaching as high as 90%.

Key Takeaways SiriusXM shares rallied Monday after Warren Buffett’s Berkshire Hathaway raised its stake in the satellite radio company.Berkshire Hathaway now holds a stake of nearly one-third in SiriusXM.

Warren Buffett's Berkshire Hathaway is buying the rest of its utility unit from the estate of a longtime board member who died three years ago, but it's not clear exactly how much it will pay for the 8% stake.