Premarket Roundup: Amazon.com, F5 Networks

Among the premarket stories for Thursday, April 24, from AP Financial News:

NEW YORK (AP) _ Deutsche Bank raised estimates on Amazon.com Inc. on Thursday after the online retailer's first-quarter results breezed past Wall Street's estimates, but shares slid in premarket trading as investors wondered what affect the slumping economy will have on sales.

NEW YORK (AP) _ Shares of F5 Networks Inc. shot higher in premarket trading Thursday, a day after the company posted a first-quarter profit that meet Wall Street estimates and guided third-quarter results in line with expectations.

ORANGE, Conn. (AP) _ Lighting and wiring products maker Hubbell Inc. said Thursday its first-quarter profit rose 16 percent, but missed analyst estimates as weakness in residential markets hurt sales growth.

NEW YORK (AP) _ Several analysts lowered their outlooks for Level 3 Communications Inc. Thursday, after the network services provider posted a narrower first-quarter loss, but still missed Wall Street forecasts.