Warren Buffett has been selling out of a lot of stocks recently, cutting back significantly on his largest holdings and raising cash in a somewhat ominous sign. But Buffett's conglomerate Berkshire Hathaway (NYSE: BRK.

Warren Buffett’s company apparently is taking advantage of the weakness in the stock, which is down 50% this year.

Warren Buffett's Berkshire Hathaway now has a stake of about 32.5% in Sirius XM’s publicly traded stock, having become the top holder last month.

Sirius XM, backed by Berkshire Hathaway, maintains strong market share and high ARPU despite competition from Spotify and Apple Music. Find out why SIRI stock is a Buy.

Warren Buffett has been buying shares of Sirius XM Holdings. Between Oct. 9 and Oct. 11, Berkshire Hathaway purchased an additional 3,564,059 shares of Sirius XM for $86.7 million. This increased its stake in the company to 32.