Millionaires’s make almost the same mistakes that we small investors make. It is just that their investing mistakes cost them more. In a recent article published on CNBC, millionaire investors were surveyed. According to the survey, 23% of the millionaires surveyed gave their top most investing mistake as not diversifying their portfolios. 22% said, they made the mistake of investing without a plan. 16% made the mistake of failing to regularly review their portfolios. The number 5 mistake was focusing too much on the past returns of the investments. You can read rest of the article here. Can you correlate your own mistakes with these mistakes?