Canada-based Canopy Growth is the largest marijuana company in the world with a market capitalization of $6.03 billion. Also read Ten largest cannabis producing countries Formerly known as Tweed Marijuana, the company changed its name to Canopy Growth in September 2015. Canopy Growth operates ten cannabis production sites with over 2.4 million square feet of production capacity, including over 500,000 square feet of GMP-certified production space. The company has operations in eight countries across five continents.