HP has signed an agreement to acquire ArcSight, a security and compliance management company, for $43.50 per share, or an enterprise value of $1.5bn.

HP said that its collaboration with ArcSight will improve security, reduce risk and facilitate compliance at a lower cost for customers.

With the acquisition, HP will be able to provide an efficient visibility of all events across IT operations, security and compliance, and the ability to detect threats and risks by correlating both activity and state changes in real time.

In addition, it will be able to offer a constant feedback loop between build, manage and monitor to ensure that enterprises remain secure.

ArcSight president and CEO Tom Reilly said that by combining the company’s enterprise threat and risk management platform with HP’s breadth of application development and operations management offering, HP will be able to offer an integrated security platform that delivers efficient visibility, context and remediation of security and risk-related events.

The company said that the closing of acquisition, which is subject to customary closing conditions, is expected to occur by the end of 2010.