Which oil company merged with Mobil in 1999?

Exxon merged with Mobil in 1999, forming ExxonMobil.

Exxon and Mobil agreed to combine in 1998 in a transaction valued at about $73.7 billion. The deal reunited two major descendants of John D. Rockefeller’s Standard Oil: Standard Oil of New Jersey became Exxon, while Standard Oil of New York became Mobil.

The transaction formally closed on November 30, 1999, after regulatory review in the United States and European Union. The Federal Trade Commission required substantial asset sales, including thousands of service stations, to address competition concerns in several regional markets.

Strictly speaking, Exxon was the surviving company and acquired Mobil, although the result was branded ExxonMobil and is commonly described as a merger. That distinction explains why “Exxon” is the expected answer rather than the name of the combined company.