S&P 500’s Banner Rally Faces Off With Worst Two Months of Year

The S&P 500 Index, coming off its best streak of gains since 2020, is about to enter what has historically been its toughest stretch of the year.

Over the past three decades, the benchmark has performed the worst in August and September, losing 0.7% on average in each month, compared with a 1.1% gain on average across other months, data compiled by Bloomberg show. Analysts attribute the pattern in part to money managers’ tendency to reassess their portfolios around this time of year.