Shares in Ixia dropped in aftermarket trading after the company said it will come up short of Wall Street’s expectations. The company said it expects to report earnings per share between $0.00 and $0.02 for the first quarter, down from its previous guidance of between $0.01 and $0.03 per share. The company said that lower-than-expected revenue in North America and Europe was the reason for the adjustment. Shares were down $0.80, or 5.9 percent, to $12.80 in after-hours trading on the INET electronic exchange. On the Nasdaq, shares closed up $0.03.