Welcome to Week of ‘Dreadful History’ for U.S. Equities: Chart

The New York Stock Exchange is reflected in a puddle in New York.

Photographer: Michael Nagle/Bloomberg

September’s historically bad for U.S. stocks, but the month’s second half has been particularly painful. The week that comes after the quarterly event known as quadruple witching, when futures and options contracts on indexes and individual stocks expire, has seen the S&P 500 Index tumble 85 percent of the time in data going back to 1990. The average loss during this “dreadful history of declines” is 1.1 percent, according to a blog post by Jeffrey Hirsch, editor-in-chief of the Stock Trader’s Almanac, who crunched the numbers.

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