List of largest mergers and acquisitions

The following tables list the largest mergers and acquisitions in their respective decade. Transactions are given in the dollar value for the year of the merger as well as adjusted for inflation. The largest ever acquisition is the 1999 takeover of Mannesmann by Vodafone Airtouch PLC at $202 billion ($290 billion adjusted for inflation). Pfizer appears in these lists the most times, with three entries for a combined transaction value of $240 billion.

Top M&A deals worldwide by value from 1870 to 1879:

Top M&A deals worldwide by value from 1900 to 1909:

Top M&A deals worldwide by value from 1940 to 1949:

Top M&A deals worldwide by value from 1950 to 1959:

Top M&A deals worldwide by value from 1960 to 1969:

Top M&A deals worldwide by value from 1970 to 1979:

Top M&A deals worldwide by value from 1980 to 1989:

Top 10 M&A deals worldwide by value from 1990 to 1999:

Top 10 M&A deals worldwide by value from 2000 to 2010:

Top M&A deals worldwide by value (larger than $20 billion) from 2011 to 2020:

This lists catalogues M&A (above $20 billion in transaction value) deals which were confirmed, but for a number of reasons, failed to complete.

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