New York (USA) - The world leading IT company IBM acquired Internet Security Systems for 1,3 billion dollars. Internet Security Systems is an important supplier of security solutions against the threats to web, desktops and servers. All ISS stakeholders will receive 28 dollars per share. This is the fourth acquisition by IBM in one month. During pre-market negotiations the ISS stock rose from 1,79 to 27,79 dollars. Since the beginning of the year there has been a 24% increase.