ArcSight has reported total revenues of $48.1m for the first quarter of fiscal 2011, an increase of 39.3% as compared to $34.55m of the same quarter prior year.

The company’s operating income for the first quarter was $4.94m as compared to $1.66m of the same period last year.

For the quarter ended 31 July 2010, the company posted net income of $3.02m, or $0.08 per diluted share, as compared to $1.02m, or $0.03 per share, for the same period last year.

ArcSight president and CEO Tom Reilly said that the company is experiencing strong growth in their core government and commercial markets and increasingly they are broadening their business into emerging verticals and new geographies internationally.

"Our strong fiscal first quarter demonstrates our ability to execute on our growth strategy of expanding our existing customer relationships, delivering a platform for Enterprise Threat and Risk Management and broadening our reach into the mid-market with our channel partners," Reilly said.

ArcSight expects revenue for the second quarter of fiscal 2011 to be in the range of $55m to $57m, representing growth in the range of 21%-25% over the same quarter of fiscal 2010.