IBM has agreed to pay approximately $2.1 billion in cash or $10.50 per share for Rational, which specializes in software-development tools. Rational will now become the fifth brand in IBM Software ...

Big Blue plans to pay $2.1 billion in cash for Rational Software, the leading seller of tools to create models of applications and databases before programmers actually start coding. Martin LaMonica ...

NEW YORK -- IBM Corp. said Friday it will purchase Rational Software Corp., a maker of development tools, for $2.1 billion in cash -- its biggest software acquisition since purchasing Lotus in 1995.

Mike Devlin is general manager of Rational Software as part of the IBM Software Group. Prior to IBM’s February 2003 acquisition of Rational Software for $2.1 billion, Devlin was Rational CEO and was a ...