Stocks Finish Friday Lower, But Nike Gets an After-Hours Earnings Boost

Friday was a crazy day for the stock market, as investors had to deal with a wild combination of factors affecting trading. The expiration of stock and index futures and options contracts, the reconstitution of the Nasdaq-100 Index, and the addition of Tesla (NASDAQ: TSLA) to the S&P 500 (SNPINDEX: ^GSPC) all introduced wild cards to the regular trading day. By the end of the session, the Dow Jones Industrial Average (DJINDICES: ^DJI), S&P 500, and Nasdaq Composite (NASDAQINDEX: ^IXIC) were all down, but they finished well off their worst levels of the day.

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Source Fool.com