BOSTON ( TheStreet) -- The S&P 500 Index has fallen 4% this year after posting a monumental rebound in 2009. Individual members of the benchmark index have suffered more pronounced downturns. And many of the laggards are closely watched companies.

Here are the 10 worst-performing S&P 500 stocks of 2010. They are ordered by return, from bad to worst.

10. Monster Worldwide ( MWW), a global online job site, has tumbled 32% this year. Monster's first-quarter loss more than doubled to $24 million, or 20 cents a share, as revenue declined 15%. The operating margin fell further into negative territory. Despite improved bookings and the steady ascent of its proprietary Employment Index, Monster has been punished by market participants. Its stock is conspicuously expensive, trading at a price-to-projected-earnings ratio of 40, a 75% premium to the Internet services industry average.

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