This has been a rough month for the stock market, so investors can be excused for being glad to see September come to an end. But is the worst yet to come? Bespoke Investing points out that September 30 - today - is arguably the worst trading day of the year.
Since 1945, the S&P 500 has declined an average of 0.15 percent on September 30. The index has posted positive returns just 38 percent of the time on today's date.
And it's gotten worse recently. Since this bull market started in 2009, there have been five September 30s that fell on trading days (one was a Sunday). Even though the market overall has been up strongly over that time, the S&P declined on all five of those September 30s.