Acquisition target DemandTec leads surge in e-commerce stocks

Investors bid up the prices of most stocks in the Internet Retailer Online Retail Index, led by DemandTec, whose price jumped 64% after IBM Corp. announced plans to buy the provider of price-optimization software for retailers.

The Online Retail Index, which tracks the stocks of 25 online retailers and e-commerce technology and service providers, rose 5.25% last week, outpacing the broader market. By comparison, the Dow Jones Industrial Average gained 1.37% and the Standard & Poor’s 500 Index moved up 0.88%.

Overall, 17 of the 25 stocks in the e-commerce index gained, and eight declined last week.

Here are the best-performing stocks last week in the Online Retail Index and the percentage increase in stock price for each:

• DemandTec, 64.8%

•U.S. Auto Parts Network, 9.0%

• Bluefly, 8.9%

• Systemax, 8.3%

• LivePerson, 7.5%

Here are the Online Retail Index stocks that performed least well last week and the percentage change in stock price for the week:

• eGain, -15.0%

•Shutterfly, -12.2%

• United Online, -4.0%

• Akamai, -2.7%

• Overstock, -1.6%

The 25 companies in the Internet Retailer Online Retail Index are: 1-800-Flowers.com Inc., Akamai Technologies, Amazon.com Inc., American Greetings Corp., Bidz.com Inc., Blue Nile Inc., Bluefly Inc., Coastal Contacts Inc., DemandTec Inc., Digital River Inc., eBay Inc., eGain Communications Corp., Keynote Systems Inc., LivePerson Inc., Netflix Inc., NutriSystem Inc., Overstock.com Inc., PetMed Express Inc., Shutterfly Inc., Systemax Inc., U.S. Auto Parts Network, United Online Inc. (owner of FTD.com), ValueClick Inc., Vistaprint Ltd and Vitacost.com Inc.