Search in article and newspaper databases with key phrases such as:
(merger* or acquisition* or M&A) and [type name of company or other search term - broad industry category; geography]
The periodical Mergers & Acquisitions has key M&A deals and news.
While articles about deals are in these subscription databases: Business Source Ultimate; ABI/Inform; Factiva - the charts about deals are not in a database. Print issues of this periodical (until 2015) are offsite at the Library Services Center. Factiva also has Mergers & Acquisitions Online, for website content of this journal; ProQuest Statistical Insight also has some tables - yet a significant delay.