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Ariba

(ARBA)

saw its stock fall for the second day in a row, down nearly 7% to $112.19. Fellow e-commerce provider

Commerce One

(CMRC)

also dropped more than 10%, closing at $56.88.

On Friday, Ariba dropped 10% and Commerce One went down 5%.

So what's up with a pair of highflying e-commerce providers? Are they being included in the general tech downturn, or are investors paying special attention to them strictly because of their value?

There might be some reason to assume that investors would pay attention to them. Software companies historically have sold at earnings-to-revenue ratios far below those of Ariba and Commerce One, said Jon Eknoniak, analyst for

U.S. Bancorp Piper Jaffray

. (His firm has done underwriting for Commerce One.)

It wouldn't be out of the question if investors decided that these two companies should get the same treatment given opticals in the past week, even without the stimulus of bad news.

"We've tended to see these extreme swings. ... When someone doesn't like it, everyone gets out," Eknoniak said.

Still, both stocks, which often have gone up and down together, have performed strongly. Both reported earnings that beat analysts' estimates in recent weeks.