America's 500 biggest stocks rose the year after every midterm since 1990

America’s 500 biggest public companies, tracked by the S&P 500 index, were worth more 12 months after Election Day in all nine midterm elections since 1990, YCharts data show. The average gain, including dividends — cash payouts to shareholders — was 16.9%. Past patterns do not predict the future — nine examples is too few for savers to judge risk.