The best-performing September in 15 years just sent U.S. stock indexes to new highs — but that party could soon end, with Goldman Sachs expecting a surge in market volatility as October kicks off a gauntlet of earnings and macro risk.
With just days left in the month, the S&P 500, tracked by the Vanguard S&P 500 ETF (NYSE:VOO), is up 3.6%, on pace for its best September since 2010. That year, the index jumped 8.76%, while in 1997 it rose 6.22% — two of the only times the market defied September's historically weak trend to this degree.
