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

July 6 Weekly Loss My Watchlist
Informatica (Nasdaq: INFA) $31.39 (26%) Add
Groupon (Nasdaq: GRPN) $8.44 (19%) Add
Amyris (Nasdaq: AMRS) $3.67 (17%) Add
OpenTable (Nasdaq: OPEN) $39.00 (13%) Add
MeetMe (NYSE: MEET) $2.12 (10%) Add

Source: Barron's.

Informatica was Nasdaq's biggest loser, shedding nearly 28% of its value on Friday alone. The falling tech darling warned that second-quarter sales would clock in around $189 million, well short of expectations of $217 million on the top line.

Groupon fell back into the single digits after chairman -- and co-founder -- Eric Lefkofsky revealed that he planned to scale back his commitment to the daily deals leader to spend more time on his venture capital firm.

Amyris stumbled after Raymond James downgrades a biofuels competitor. The entire niche was hit hard on the analyst move.

OpenTable was bloodied rare after an analyst suggested that the online dining reservations leader may post its first sequential dip in revenue for the quarter that ended last month.

MeetMe met a week of selling. The social discovery specialist announced on Friday of the prior week that it was closing down its online gaming studio in Brazil.

Ready for a bounce
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The Motley Fool owns shares of OpenTable. Motley Fool newsletter services have recommended buying shares of Informatica and OpenTable. 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.