This guide is intended to be just a start for those doing research generally as well as those looking for more detailed information.
The focus is specifically on the United States – though many of these sources do cover international deals. As for sources for SEC filings, I have only included a few that are more well known both paid and free. Also, there is much information on mergers, acquisitions, and joint ventures that I have not included. I have focused on the more technical sources dealing with transaction specific information, so such things as management of corporate change and other sociological aspects have not been included.
For a variety of reasons, many of the sources will not necessarily have all of the information on a deal that is desired.