The market capped off a solid first quarter with another healthy week, with the Nasdaq Composite leading the way with a 1.7% surge.

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


April 1 Weekly Gain My Watchlist
GSI Commerce (Nasdaq: GSIC) $29.34 51% Add
Spectrum Control (Nasdaq: SPEC) $19.68 40% Add
VirnetX (AMEX: VHC) $21.25 32% Add
Cephalon (Nasdaq: CEPH) $76.04 31% Add
Westport Innovations (Nasdaq: WPRT) $24.00 28% Add

Source: Barron's.

Shares of e-commerce solutions provider GSI Commerce took off after agreeing to be acquired by eBay (Nasdaq: EBAY) in a $2.4 billion deal. It's a move that makes perfect sense for eBay. Its auction-based marketplace has been sluggish lately, and GSI is growing briskly by getting small and large companies set up to do business online.

Spectrum also soared on buyout news. API Tech is snapping up the maker of microwave components and power management systems in a $270 million deal.

VirnetX had a strong run this week, fueled by the ka-ching-generating potential of its patents in light of the recent push by companies to meet 4G LTE specifications. The stock's been wild lately, but most investors know that going in.

Cephalon popped after a hostile bid from rival drugmaker Valeant (NYSE: VRX), offering to buy the company whole at $73 a pop or pay $2.8 billion for Cephalon's non-oncology business. The stock closed out the week well above Valeant's offer, so either a sweetened offer is in the works or Cephalon investors are in for a bruising if Valeant walks away.

Finally, we have Westport hitting the accelerator. The maker of engines running on natural gas got a welcome boost after President Barack Obama made a commitment to purchase only alternative fuel vehicles for the federal government by 2015.

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.