HP Buys Fortify
Date: August Price Tag: Rumored to be at least $200 million Specialty Gained: Software security
CA Technologies Buys Arcot
Date: August Price Tag: $250 million Specialty Gained: Fraud prevention and authentication
IBM Buys BigFix
Date: July Price Tag: $400 million Specialty Gained: Endpoint security and monitoring
Symantec Buys PGP and Guardian Edge
Date: April Price Tag: $370 million Specialty Gained: Encryption
3M Buys Cogent
Date: August Price Tag: $943 million Specialty Gained: Biometric security
Symantec Buys Verisigns Authentication Business
Date: May Price Tag: $1.28 billion Specialty Gained: SSL authentication
Trustwave Buys Breach Security
Date: June Price Tag: Undisclosed Specialty Gained: Web application firewalls
VMware Buys TriCipher
Date: August Price Tag: Rumored to be $118 million Specialty Gained: Authentication
HP Buys ArcSight
Date: September Price Tag: $1.5 billion Specialty Gained: Security Information and Event Monitoring
Intel Buys McAfee
Date: August Price Tag: $7.6 billion Specialty Gained: Security across the enterprise and across all types of infrastructure