List of mergers and acquisitions by IBM
From Wikipedia, the free encyclopedia
IBM has undergone a large number of mergers and acquisitions during a corporate history lasting over a century; the company has also produced a number of spinoffs during that time.

The acquisition date listed is the date of the agreement between IBM and the subject of the acquisition. The value of each acquisition is listed in USD because IBM is based in the United States. If the value of an acquisition is not listed, then it is undisclosed.
Many of the companies listed in this article had subsidiaries of their own who had subsidiaries who ... For examples, see Pugh's book Building IBM, page 26.[1]