Warren Buffett is arguably the world’s most famous investor, and his investment moves are closely followed. Each quarter, the company he runs, Berkshire Hathaway, discloses its current holdings to shareholders.

It's no big secret that Warren Buffett has been a net seller of stocks recently. Thanks to several massive stock sales, and a few smaller ones, Berkshire Hathaway 's ( BRK.A 0.50%) ( BRK.B 0.52%) cash stockpile has ballooned to $325 billion as of the most recent quarter, far more than the conglomerate has ever had on hand before.

Warren Buffett’s Berkshire Hathaway (BRK.A) (BRK.B) has recently increased its stake in Sirius XM Holdings Inc. (SIRI), now owning over 35% of