List of largest mergers and acquisitions
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The following tables list the largest
mergers and acquisitions Mergers and acquisitions (M&A) are business transactions in which the ownership of a company, business organization, or one of their operating units is transferred to or consolidated with another entity. They may happen through direct absorpt ...
by decade of transaction. Transaction values are given in the
US dollar The United States dollar (symbol: $; currency code: USD) is the official currency of the United States and several other countries. The Coinage Act of 1792 introduced the U.S. dollar at par with the Spanish silver dollar, divided it int ...
value for the year of the merger, adjusted for inflation. , the largest ever acquisition was the 1999 takeover of
Mannesmann Mannesmann was a German industrial conglomerate. It was originally established as a manufacturer of steel pipes in 1890 under the name "Deutsch-Österreichische Mannesmannröhren-Werke AG" (lit. "German-Austrian Mannesmann pipe-works joint-s ...
by
Vodafone Airtouch plc Vodafone Group Public Limited Company () is a British multinational telecommunications company. Its registered office and global headquarters are in Newbury, Berkshire, England. It predominantly operates services in Asia, Africa, Europe, and ...
at $183 billion ($ billion adjusted for inflation).
AT&T AT&T Inc., an abbreviation for its predecessor's former name, the American Telephone and Telegraph Company, is an American multinational telecommunications holding company headquartered at Whitacre Tower in Downtown Dallas, Texas. It is the w ...
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. Mergers are shown as the market value of the combined entities.


Free market enterprises


1870s

Top 2 M&A deals worldwide by value from 1870 to 1879:


1880s

Top 2 M&A deals worldwide by value from 1880 to 1889:


1890s

Top 2 M&A deals worldwide by value from 1890 to 1899:


1900s

Top 3 M&A deals worldwide by value from 1900 to 1909:


1910s

Top 3 M&A deals worldwide by value from 1910 to 1919:


1920s

Top 5 M&A deals worldwide by value from 1920 to 1929:


1930s

Top 5 M&A deals worldwide by value from 1930 to 1939:


1940s

Top 5 M&A deals worldwide by value from 1940 to 1949:


1950s

Top 10 M&A deals worldwide by value from 1950 to 1959:


1960s

Top 10 M&A deals worldwide by value from 1960 to 1969:


1970s

Top 15 M&A deals worldwide by value from 1970 to 1979:


1980s

Top 30 M&A deals worldwide by value from 1980 to 1989:


1990s

Top M&A deals worldwide by value ($20 billion or larger) from 1990 to 1999:


2000s

Top M&A deals worldwide by value ($20 billion or larger) from 2000 to 2009:


2010s

Top M&A deals worldwide by value ($20 billion or larger) from 2010 to 2019:


2020s

Top M&A deals worldwide by value ($20 billion or larger) from 2020 to 2029:


State-owned enterprises

Top M&A deals worldwide by value ($20 billion or larger) between state-owned enterprises:


Largest ever deals which have failed to complete

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.


See also

*
List of largest companies by revenue This list comprises the world's largest companies by Consolidation (business), consolidated revenue, according to the annually ranked Fortune Global 500, ''Fortune'' Global 500 published by ''Fortune'' magazine, as well as other sources. Out of 5 ...
*
List of largest corporate profits and losses This page lists the largest annual and quarterly earnings and losses in corporate history. Largest corporate annual earnings of all time This list has all global annual earnings of all time, limited to earnings of more than $40 billion in "real" ...
* List of largest corporate spin-offs *
List of largest employers Largest employers Below is the list of largest employers including government owned companies and institutions in 2022. Fortune Global 500 Following is the list of Fortune 500 companies providing the most jobs worldwide, according to a list ...
* List of largest pharmaceutical mergers and acquisitions *
List of public corporations by market capitalization The following is a list of publicly traded companies having the greatest market capitalization, sometimes described as their "market value": Market capitalization is calculated by multiplying the share price on a selected day and the number of ...


Notes


References

{{Corporate finance and investment banking, state=collapsed *Largest mergers and acquisitions Largest mergers and acquisitions
Mergers and acquisitions Mergers and acquisitions (M&A) are business transactions in which the ownership of a company, business organization, or one of their operating units is transferred to or consolidated with another entity. They may happen through direct absorpt ...