To access Investext, open Mergent Online and select the the second last tab on the right.
You can use Investext for a wide range of Company and Industry research.
When researching M&A transactions, start from the search screen:
Once you've finished filtering your search, click View to see the list of reports
To modify your search or to start over, click on either 'New Search' or 'Modify' in the upper left