Warren Buffett during an interview with CNBC’s Becky Quick on February 24, 2020. It turned out to be another year during which the billionaire investor shied away from game-changing acquisitions in a pricey market even after a sudden market cash and as his company holds a massive cash balance. Gerald Miller | CNBC Warren Buffett’s Berkshire Hathaway made some big purchases in 2020, but the biggest Buffett buy speaks to the big challenge the company will continue to face: there was nothing it could find at a better price than its own shares. Berkshire bought back more than $18 billion in its own shares last year, through October, almost twice as much as Buffett spent on his next biggest acquisition, the $10 billion natural gas assets transaction with Dominion Energy, which including the debt acquired, was the largest acquisition since 2016. Taken at his word — which he has earned — that he won’t do a share repurchase just to prop up the stock, the big buyback was a