Down big earlier in the day, the S&P 500 Index regained some of its standing by the time of the closing bell, but it still wasn't quite enough: The index suffered its worst week of 2013 in the first week of April, losing 1% in the past five trading days. But even as the S&P had its fair share of losers Friday, three stocks in particular stood out as major laggards.

The victim of a severe double-whammy, F5 Networks simply got pummeled today, falling 19%, after preliminary quarterly projections caused a flurry of analyst downgrades. In a true sign of just how awful its second quarter guidance was, the network technology provider even dragged down several of its competitors today, as Wall Street worried whether the numbers were an indication of the industry's fundamental health.

It's hard to outdo nearly 20% losses, but Aflac's 3.9% slide today was nothing to scoff at, either. Shares of the insurer slumped as bond yields declined further; investment capital flocked from equities to lower-risk bonds, driving 10-year Treasuries to a mere 1.7% rate. Low rates are especially harmful to insurance giants like Aflac, which can hold billions of dollars in low-risk securities as collateral for potential policy payouts. 


One of the aforementioned competitors limping into the weekend on F5 Networks' gloomy announcement was Juniper Networks , which closes out our list of underperformers after a 3.2% drop on Friday. Though investors will have to wait until April 24 to hear Juniper's official quarterly results, the market has no reason to think that the company will outperform after hearing of another stalled network communications business. Of course, just because F5 isn't coming along as planned doesn't necessarily mean that Juniper is struggling, but decreased spending by major service providers AT&T and Verizon is cause for legitimate concern for Juniper.

Today's rush to the bond market shows us that income investors still have a big say in the market. If you're on the lookout for high-yielding stocks that have the potential for a much larger return than fixed income, The Motley Fool has compiled a special free report outlining our nine top dependable dividend-paying stocks. It's called "Secure Your Future With 9 Rock-Solid Dividend Stocks." You can access your copy today at no cost! Just click here.

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 recommends Aflac and F5 Networks. The Motley Fool owns shares of F5 Networks. 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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