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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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.