Prehistoric times: Nortel, Mitel, Corel, RIM Recent times: possibly Shopify, one other moved to USA Most money in Canada is controlled by civil pension funds,

Prehistoric times: Nortel, Mitel, Corel, RIM Recent times: possibly Shopify, one other moved to USA Most money in Canada is controlled by civil pension funds, who don't like smallish investments for big risks. Thus a large percentage of software engineers move to USA, and are active in Silicon Valley.