Warren Buffett weighed in on the rising popularity of activist investors in a recent interview on CNBC’s Squawk Box, saying that selling a company may be good for short term performance but that he’d rather just own good companies. ‘I don’t think I’d split it up’: Buffett “Most stocks, most of the time, not all of the time, sell at a discount from what you could sell the company for that day,” said Buffett. “I’ve seen cases where really good companies have sold for a third or quarter what they were worth. The answer isn’t to sell the company, the…