There's never a shortage of losers in the stock market. Let's take a closer look at five of this past week's biggest sinkers.


Feb. 14

Weekly Loss

Infoblox (NYSE:BLOX)



NanoViricides (NYSEMKT:NNVC)



Angie's List (NASDAQ:ANGI)



Rackspace (NYSE:RAX)



Trulia (NYSE:TRLA)



Source: Barron's.

Let's start with Infoblox, which plunged after offering up disastrously weak guidance. Last month was dreadful, with fewer large transactions and federal orders for the enterprise networking specialist. Wall Street wasn't amused. Needham & Co., UBS, and Pacific Crest analysts all downgraded Infloblox on the report.

NanoViricides called in sick after a scathing article was published on Seeking Alpha, accusing company executives of looting the company and alluding to the dubious nature of its technology. The piece ultimately argued that the shares could fall 82%. Despite being the first and only article from an admitted short-seller -- not that being short taints a bearish perspective, just as being long doesn't nullify a bullish one -- it was enough to scare away many investors. The nano-medicine company countered with a rebuttal, requesting that Seeking Alpha remove the article. It's still there as of this writing.

Angie's List got checked off after a quarterly report that was marred by weak guidance. The website that offers reviews of local service providers is now up to nearly 2.5 million paying members, but it's not growing as quickly as Wall Street was forecasting. Analysts were expecting revenue of $74.3 million in the current quarter, but Angie's List guidance calls for just $71.5 million to $72.5 million on its top line.

Rackspace didn't load properly after announcing that its CEO is stepping down. The webhosting giant also posted uninspiring quarterly financials with a sharp drop in profitability. Tech giants have been ramping up their cutthroat pricing to draw customers to their massive fleets of servers. The move has been challenging to Rackspace's margins.

Trulia slumped after falling woefully short of Wall Street's profit target. The fast-growing real estate portal didn't have a problem drumming up new revenue from advertisers and real estate pros wanting enhanced access to the site's visitors. Revenue more than doubled. However, Trulia's profit of $0.03 a share was well below the net income of $0.08 the analysts were expecting.

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Rick Munarriz has no position in any stocks mentioned. The Motley Fool recommends Rackspace Hosting. Try any of our Foolish newsletter services free for 30 days. We Fools don't 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.