E-commerce stocks sink along with the market

Last week’s fireworks on Wall Street were all of the ash can variety, as share prices tumbled, taking e-commerce stocks with them.

The Internet Retailer Online Retail Index of 25 e-commerce stocks lost 6.87% last week. That was even worse than the broader market, as the Dow Jones Industrial Average slid 4.59% and the Standard & Poor’s 500 Index fell 5.04%.

Only one of the stocks tracked by the Online Retail Index managed a gain—e-retailer PetMed Express Inc.

As of the start of the third quarter, online retailer Vitacost.com Inc. joins the Online Retail index, replacing CyberSource, which is being acquired by payment card company Visa Inc.

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

• PetMed Express, 0.62%
• VistaPrint, -0.49%
• DemandTec, -.076%
• U.S. Auto Parts Network, -0.98%
• Keynote Systems, -2.55%

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

• Drugstore.com, -13.79%
• LivePerson, -12.36%
• Akamai, -12.24%
• Overstock, -12.18%
• Bidz.com, -11.18%

The 25 companies in the Internet Retailer Online Retail Index are: 1-800-Flowers.com Inc., Akamai Technologies, Amazon.com Inc., American Greetings Corp., Art Technology Group Inc., Bidz.com Inc., Blue Nile Inc., DemandTec Inc., Digital River Inc., Drugstore.com Inc., eBay Inc., GSI Commerce Inc., Keynote Systems Inc., LivePerson Inc., Netflix Inc., NutriSystem Inc., Overstock.com Inc., PetMed Express Inc., RealNetworks Inc., Shutterfly Inc., Systemax Inc., U.S. Auto Parts Network, United Online Inc. (owner of FTD.com), Vitacost.com Inc. and VistaPrint Ltd.