5 of Last Week's Biggest Losers

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.

Source: Barron's.

Nabi shed nearly two-thirds of its value after its once-promising nicotine vaccine failed in a pivotal critical trial. The stock actually fell below the value of the roughly $100 million in cash sitting on its balance sheet, as the market fears that it will continue to burn through its greenbacks on its way to a marketable treatment.

Avid hit the skids after posting an unexpected loss in its latest quarter. It's the second quarter in a row that finds analysts banking on a profit that fails to materialize. Will Wall Street learn, or will the video-editing software maker cut these disappointing scenes from memory banks of twice-humbled analysts?

Shares of India's Sify came under fire after a Wall Street Journal inquiry into the Internet services provider's number of shares outstanding. Sify's share count has apparently more than tripled over the past year, but some investor sources are still using the outdated metrics.

Travelzoo lost its cage match with Mr. Market after coming up short in its latest quarter. There may be nothing fundamentally wrong with a company that's growing revenue and earnings by 34% and 51%, respectively, but analysts were holding out for more on both ends from the travel deals publisher.

Riverbed dragged the river after the network efficiency specialist posted uninspiring quarterly results and equally disappointing guidance. Several analysts downgraded Riverbed after the report, though largely on a valuation basis given its torrid run over the past year.

It was a rough week for these five stocks. Let's see which ones bounce back this week.