Berkshire first invested in Amazon in Q1 2019. During that quarter, Amazon's average price was about $83 per share. The stock trading for around $200 per share now would indicate a 141% return on investment. However, the bulk of that return has come in recent months, as Amazon's AI affiliation is starting to take hold.

Warren Buffett raised $158B in cash this year, selling stocks in Q3 and opting for Treasuries. Find out why BRK.B continues to sell stocks at a brisk pace.

Warren Buffett’s Berkshire Hathaway has been selling Apple stock and building up its cash reserves. The company’s cash pile has reached a record high of $325.2 billion. Buffett started reducing Berkshire’s stake in Apple late last year.