The market had a ho-hum week, with most of the major market averages posting small dips. Let's take a closer look at five of this past week's biggest scorchers:


April 8Weekly GainMy Watchlist
National Semiconductor (NYSE: NSM)$24.0469%Add
XenoPort (Nasdaq: XNPT)$9.3154%Add
ImmunoGen (Nasdaq: IMGN)$12.1235%Add
Allied Irish Banks (NYSE: AIB)$3.9035%Add
VirnetX (AMEX: VHC)$21.2529%Add

Source: Barron's.

National Semi was the market's hottest stock, soaring 69% after agreeing to be acquired by Texas Instruments (NYSE: TXN). The chipmaker is still trading at a slight discount to the $25-a-share cash price, but that's because the deal isn't likely to close until this year's final quarter.

XenoPort soared after the Food and Drug Administration approved the company's restless leg syndrome treatment. This wasn't a given, especially after earlier Horizant tests showed that it may cause pancreatic cancer in lab rats. GlaxoSmithKline (NYSE: GSK) is XenoPort's partner on Horizant, but its success will obviously be a bigger needle mover at the relatively smaller XenoPort.

Shares of ImmunoGen jumped after marketing partner Roche reported that its T-DM1 prevented breast cancer tumor growth better than a rival treatment. The biotech's stock has climbed 53% since being recommended to Rule Breakers newsletter service subscribers less than six months ago.

VirnetX padded its prior week gains after being awarded a new patent for secure communications technology in smartphones. VirnetX is already going after several tech giants, and this only bolsters its case in these potentially lucrative patent-infringement lawsuits.

Allied Irish Banks saw green after Ireland announced its banking nationalization plans. Despite some problematic stress test results, at least the bank is assured of being a key player in Ireland's banking future. The shares still have a long way to go to take out the bank's reverse-adjusted 52-week high of $22.75.  

It was a great week for these five stocks. Now let's see if they're up for an encore.

Which of these five stocks do you think will continue to move higher? Share your thoughts in the comment box below.

ImmunoGen is a Motley Fool Rule Breakers choice. GlaxoSmithKline is a Motley Fool Global Gains recommendation. The Fool owns shares of GlaxoSmithKline and Texas Instruments. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors.

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. The Fool has a disclosure policy.