Stronach Group, doing business as 1/ST (pronounced "first"[1]), is an entertainment and real estate company in North America with thoroughbred horse racing and parimutuel gambling at the core.

The Stronach Group entered the horse racing industry by purchasing Magna Entertainment Corporation's former holdings from MI Developments.

Other ventures include Xpressbet, a wagering business that allows customers to wager on over 100 horse racing tracks via internet or telephone Stronach Group also owns thoroughbred training facilities in conjunction with its racetracks in California, Florida, and Maryland, and owns and operates facilities that manufacture a straw-based bedding product, StreuFex.

[6] In 2006, under what was Magna Entertainment Corporation completed its purchase of AmTote International, who provide totalizator services to the horse racing industry.

On March 23, 2010 an agreement was reached to sell the two Maryland Jockey Club tracks (Pimlico and Laurel Park) from Magna Entertainment Corporation to its parent company MI Developments.