The S&P 500 Index rose 3.5 points, or 0.23%, today to close the week at 1,518. Despite Friday's moderately higher market, these three S&P 500 components were thoroughly disappointing, ranking as the worst performers in the index.

Sometimes, the day's laggards are unfamiliar sights, falling on a negative rumor or as a result of some political agenda that's briefly in the headlines. Not the case with Peabody Energy , which fell 4.6% today. The consistently underperforming coal miner has lost more than 20% in 2013, and 40% in the last year. With the rise of cleaner energies like natural gas, "dirty coal" has lost popularity. Today's stumble was the result of an analyst citing the potential for Chinese coal demand to wane as the country fights pollution.

GameStop , set to report earnings later this month, dropped 4% today. The main reason for Friday's decline was because the stock went "ex-dividend" today, meaning that anyone listed as holding the stock as of today will receive the next quarterly dividend. Some short-term investors will hold stocks until their ex-dividend date to make sure they'll receive the next dividend, then sell immediately. With a 4.4% annual dividend, GameStop's payout isn't exactly trivial. 


Finally, shares of semiconductor producer Advanced Micro Devices slipped 2.8%. Apparently, AMD settled a lawsuit from Tessera Technologies, one that dates back to 2005, in which Tessera claims AMD infringed on patents in some of its products. Although exact details of the resolution weren't released, the news that AMD will be shelling out money at a time it needs to be investing in itself doesn't exactly make for happy shareholders. The stock is down nearly 70% in the last year alone, as the business struggles to adjust to a rapidly evolving technological landscape.

The coal industry in the United States has been in a state of flux since the arrival of a cheaper alternative for energy production: natural gas. Exports are becoming a much bigger part of the domestic coal landscape, and Peabody Energy has deals in place to get its cheaper coal from the Powder River and Illinois basins to India, China, and the EU. For investors looking to capitalize on a rebound in the U.S. coal market, The Motley Fool has authored a special new premium report detailing exactly why Peabody Energy is, perhaps, most worthy of your consideration. Don't miss out on this invaluable resource -- simply click here now to claim your copy today.

The article Today's 3 Worst Stocks originally appeared on Fool.com.

Fool contributor John Divine has no position in any stocks mentioned.  You can follow him on Twitter @divinebizkid and on Motley Fool CAPS @TMFDivine . The Motley Fool owns shares of GameStop. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

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