FireEye, Inc. revised preliminary revenue guidance for the fourth quarter and full year ended December 31, 2013. For the fourth quarter, the company expects total revenue is to be in the range of $55 to $57 million, compared with previous guidance of $52 to $54 million.

For the year 2013, the company expects total revenue is to be between $159 and $161 million, compared with previous guidance of $156 to $158 million.

The company revised revenue guidance for the year 2014. Total revenue for 2014 is now expected to be within the range of $400 to $410 million, compared with the previous expected range of $240 to $250 million. The revenue to reflect the acquisition of Mandiant, which closed on December 30, 2013. In 2014, the company expects gross margins for the combined company to remain in the range of 70% to 73% and it expect this combination to improve operating margins and operating cash flow as a percentage of revenues.