London's economy is dominated by locomotive and military vehicle production, insurance, and information technology. Major companies such as the London Life insurance company was founded there, and Electro-Motive Diesels, Inc. (formerly General Motors' Electro-Motive Division) now builds all its locomotives in London. General Dynamics Land Systems also builds armoured personnel carriers there, and London also is a source of life sciences and biotechnology related research; much of this is spurred on by the University of Western Ontario. Also located in London is the headquarters of the Canadian division of 3M, and both the Labatt and Carling breweries were founded in London, Ontario.
Kellogg's also has a major factory in London. Thanks to a $223 million expansion that started in 1984, Kellogg Canada's 106,000 m London plant is one of the most technologically advanced cereal manufacturing facilities within the Kellogg Company.
A portion of the population of the city work in factories outside of the city limits, including Ford and the joint General Motors Suzuki automotive plant CAMI, with further potential in a future Toyota plant in Woodstock.