National Discount Brokers

(NDB)

was down 5.9% at midday after it posted a

first-quarter loss of 6 cents, beating the Street's reduced expectations. In the year-ago quarter the company had a 2 cent profit. Other online brokers also fell.

Ameritrade

TheStreet Recommends

(AMTD) - Get TD Ameritrade Holding Corporation Report

lost 2.9%, and

E*Trade Group

(EGRP)

was down 4.5%.