The S&P 500 has had a banner year, posting a 19% gain so far as excitement about artificial intelligence, a recovery from last year's sell-off, and an improving economy have lifted the broad market.

However, not every S&P 500 stock has been a winner. In fact, a number of stocks in the market-tracking index have fallen sharply this year. Let's look at the four worst performers to see if any are worth buying today.

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Source Fool.com