Hewlett-Packard is widely reported to be close to buying intrusion detection security software company ArcSight for $1.5bn.
HP has been negotiating to buy ArcSight since it was put up for sale late last month, according to the Wall Street Journal.
The Journal says a deal could be announced as early as today (13 September), but the situation is still fluid and could fall apart.
HP's interest in ArcSight suggests that Intel's recent $6.8bn acquisition of security firm McAfee will herald a consolidation in the crowded security market, according to the Financial Times.
The paper said HP competitors Cisco Systems and IBM had already made acquisitions in security with a view to integrating them into services, because security is increasingly being considered a critical part of the decision-making process when ordering other goods or services.