Berkshire Hathaway first bought Apple ( AAPL 1.86%) shares in the first quarter of 2016. That was a wildly successful decision, as the "Magnificent Seven" stock has soared 797% since the start of that year (as of Jan. 31).

Warren Buffett’s Berkshire Hathaway has spent another $54 million to purchase Sirius XM stock, giving it a stake of more than 35% in the satellite-radio company.

Key Takeaways Berkshire Hathaway has bought more shares of satellite radio broadcaster SiriusXM, a new SEC filing shows.Shares of the owner of its namesake satellite provider and the Pandora streaming service rose Tuesday.