Shares in internet auctioneer eBay plunged in Frankfurt floor trade on Thursday, after the company forecast results for the remainder of 2010 below Wall Street expectations.

The forecast for eBay fell short of analysts' expectations, a Frankfurt-based trader said.

Qualcomm , the world's biggest maker of cellphone chips, also fell 8.6 percent in Frankfurt , after forecasting lower-than-expected revenue late on Wednesday.

(Reporting by Christoph Steitz)