The following tables list the largest mergers and acquisitions by decade of transaction.
AT&T appears in these lists the most times with five entries, for a combined transaction value of $311.4 billion.
Mergers and acquisitions are notated with the year the transaction was initiated, not necessarily completed.
Top M&A deals worldwide by value ($20 billion or larger) from 2020 to 2029: Top M&A deals worldwide by value ($20 billion or larger) between state-owned enterprises:
This lists catalogues M&A deals ($20 billion or larger in transaction value) which were confirmed, but for a number of reasons, failed to complete.