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.

Company

June 29 Weekly Loss My Watchlist
Research In Motion (Nasdaq: RIMM) $7.39 (25%) Add
GeoEye (Nasdaq: GEOY) $15.48 (16%) Add
James River Coal (Nasdaq: JRCC) $2.71 (16%) Add
Proto Labs (NYSE: PRLB) $28.76 (15%) Add
Nokia (NYSE: NOK) $2.07 (13%) Add

Source: Barron's.

Research In Motion's motion wasn't appreciated by shareholders, as the BlackBerry maker shed a quarter of its value after posting a sharper loss than analysts were expecting on a brutal 42% top-line slide.

GeoEye carves a cozy living as a high-tech shutterbug taking satellite snapshots, but last week it didn't give investors a pretty picture. The company is warning that a federal agency may be scaling back on a juicy $3.8 billion satellite imagery contract.

James River Coal slipped after Standard & Poor's downgraded the coal company. It's been a rough run for James River Coal and its peers lately.

Proto Labs went public earlier this year, and that's usually an invitation for analysts to chime in with rosy coverage. Well, Jefferies initiated coverage of the on-demand 3-D publisher with an uninspiring "hold" rating.

Nokia continues to be more finished than Finnish. The stock tumbled again last week, initially fueled by the success that Samsung is having with its Android-fueled Galaxy. It seems as if Nokia may have bet on the wrong horse in the smartphone mobile operating system race.

Ready for a bounce
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Motley Fool newsletter services have recommended buying shares of GeoEye and Proto Labs. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.

Longtime Fool contributor Rick Munarriz calls them as he sees them. He does not own shares in any of the stocks in this story. Rick is also part of the Rule Breakers newsletter research team, seeking out tomorrow's ultimate growth stocks a day early.