5 of Last Week's Biggest Winners


What's better than momentum? Mo' momentum.

Let's take a closer look at five of this past week's biggest scorchers.


May 11

Weekly Gain

My Watchlist

Arena Pharmaceuticals (NAS: ARNA)




Vertex Pharmaceuticals (NAS: VRTX)




Rosetta Stone (NYS: RST)




Accretive Health (NYS: AH)




Achillion Pharmaceuticals (NAS: ACHN)




Source: Barron's.

Arena Pharmaceuticals was last week's biggest winner, soaring 146% after an advisory committee showed support for its lorcaserin weight-loss treatment. Several obesity drugs are battling it out for regulatory approval, and the stocks themselves will pack on the pounds or shed them as the victors emerge.

The market's second biggest gainer was another biotech. Vertex rose in a sluggish market after releasing promising clinical data for its VX-809 and Kalydeco drugs in the treatment of cystic fibrosis.

Rosetta Stone investors know that applause doesn't need a translation. The language learning program company posted stronger-than-expected quarterly results. Revenue soared above estimates, and Rosetta Stone posted a much smaller deficit than what Wall Street was targeting.

Accretive Health may have slashed its outlook, but analysts preferred to focus on the health care services provider's ability to surpass market expectations in its latest quarter.

Finally we have Achillion moving higher after reporting a narrowing quarterly deficit, offering up encouraging development news, and snagging a UBS analyst upgrade.

More winners for you
It was a great week for these five stocks. If you want to get an early read on some of tomorrow's major gainers, there's a special report on three hidden winners in a booming industry. The report is free -- like this article -- but it won't be around forever, so check it out now.

At the time thisarticle was published The Motley Fool owns shares of Rosetta Stone.Motley Fool newsletter serviceshave recommended buying shares of Vertex Pharmaceuticals and Rosetta Stone. The Motley Fool has adisclosure policy. We Fools may not all hold the same opinions, but we all believe thatconsidering a diverse range of insightsmakes us better investors. Try any of our Foolish newsletter servicesfree 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 theRule Breakersnewsletter research team, seeking out tomorrow's ultimate growth stocks a day early.

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