Utilize the input text as a context reference, choose the right relationship between Thomson Reuters and Toronto from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Thomson Reuters shares are listed on the Toronto and New York Stock Exchanges (symbol: TRI).

Answer: location_of_formation