This document summarizes the history of healthcare IT company acquisitions and mergers involving McKesson. It details how McKesson grew through acquiring other companies like IBAX in 1994 and AMEX in 1995. AMEX had previously acquired Systems Associates Inc. and part of McAuto, combining them. McKesson then acquired AMEX's health systems group in 1995. As a result of these acquisitions, McKesson vaulted to the top position in annual revenue in the healthcare IT industry by 1999, a spot they have maintained since.