Benzinga's Top 5 Pre-Market Gainers (AMZN, MSFT, SYNA, COF, BUCY)

Benzinga's top 5 pre-market gainers are plenty of four letter symbols. The top 5 pre-market gainers include: Amazon.com (Nasdaq: AMZN) up 17%, Microsoft (Nasdaq: MSFT) up 10%, Synaptics Incorporated (Nasdaq: SYNA) rising 9.7%, Capital One (NYSE: COF) up 9.3% and Bucyrus International Inc. (Nasdaq: BUCY) up 7.17%.

Amazon.com, Microsoft, Synaptics and Bucyrus had knock out earnings and will likely continue their momentum.

Bucyrus raised FY09 revenue guidance to $2.6 billion to $2.65 billion from previous guidance of $2.5 billion, versus consensus view on Bucyrus of $2.57 billion.

Amazon.com is the largest online retailer, while Microsoft powers 95% of the computers worldwide, and Capital One extends credit to cash strapped consumers.