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 3

Weekly Loss

My Watchlist

Sino Clean Energy (Nasdaq: SCEI)

$1.94

(26%)

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Orexigen Therapeutics (Nasdaq: OREX)

$2.12

(26%)

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Vera Bradley (Nasdaq: VRA)

$39.07

(22%)

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China Zenix Auto (NYSE: ZX)

$4.73

(21%)

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L&L Energy (Nasdaq: LLEN)

$4.91

(20%)

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Source: Barron's.

Sino Clean Energy shares have been sinking in recent weeks under a deluge of fraud allegations. It's fighting back, but can its promising coal-water slurry fuel be enough to silence critics? Sino is litigiously going after its naysayers, and last week announced that it was stepping up its share buyback plan. If everything checks out, Sino's heavily shorted shares will bounce back nicely. If not, I guess we'll have another Chinese microcap implosion on our hands.  

Orexigen shareholders have to feel like they're on a yo-yo diet. Shares of the biotech company soared on Wednesday after it revealed that an important regulatory update on its obesity drug was coming on Friday. Two days later, the stock shed a third of its value when its anticipated revelation was that it would be temporarily abandoning its stateside approval efforts given the Food and Drug Administration's stringent requirements.

Vera Bradley got its handbag swiped after the trendy accessories maker reiterated its full-year guidance despite beating Wall Street expectations in its most recent quarter. Investors tend to get cautious when a beat isn't followed by a stronger outlook.

It's been a bumpy road for Zenix. The maker of wheels for commercial vehicles was hoping to go public between $9.50 and $11.50 last month. It settled for a $6 IPO, and it's been largely downhill ever since.

Finally, we have L&L Energy as another Chinese company slipping lower after a bearish attack. A report took the coal miner's Securities and Exchange Commission filings to task over formatting mistakes. Are the bears merely nitpicking now? Sino Clean Energy's thesis applies here. If L&L checks out, it should make back last week's losses.

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

Which of these five stocks do you think bottomed out last week? Share your thoughts in the comment box below.

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Longtime Fool contributor Rick Munarriz enjoys cheering on winners and whispering words of encouragement to the losers. He does not own shares in any of the companies in this story. He is also part of the Rule Breakers newsletter research team, seeking out tomorrow's ultimate growth stocks a day early.