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 20 Weekly Loss My Watchlist
New Oriental Education (NYSE: EDU) $12.91 (44%) Add
Synacor (Nasdaq: SYNC) $11.25 (30%) Add
BioSante Pharmaceuticals (Nasdaq: BPAX) $1.62 (21%) Add
Chipotle Mexican Grill (NYSE: CMG) $316.98 (19%) Add
Rambus (Nasdaq: RMBS) $4.30 (17%) Add

Source: Barron's.

New Oriental Education didn't earn a passing grade with investors after revealing the SEC was looking into the Chinese private educator's accounting practices.

Synacor was the biggest loser on Nasdaq, fueled by Jim Cramer advising Mad Money viewers that it's time to take profits of the recent IPO that has still more than doubled since its debut. Investors may also be getting nervous ahead of Wednesday's quarterly report.

BioSante took a spill on Tuesday and Wednesday after entering into a privately negotiated securities exchange agreement with a holder of convertible senior notes to swap the debt for 578,266 shares of the biotech company.

Chipotle was rolled over like one of its signature burritos after delivering a mixed quarterly report. Earnings and margins came in better than expected, but the quick-service eatery chain missed on the top line despite an enviable 8% spike in unit-level comps.

Rambus hopped on a bus heading the wrong way after posting a larger deficit than Wall Street was targeting in its latest quarter.

Ready for a bounce
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The Motley Fool owns shares of Chipotle Mexican Grill. Motley Fool newsletter services have recommended buying shares of Chipotle Mexican Grill and New Oriental Education. Motley Fool newsletter services have recommended creating a bear put spread position in Chipotle Mexican Grill. 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.