TORONTO — Shares of Canadian medical marijuana producers Bedrocan Cannabis Corp. and OrganiGram Holdings Inc. jumped as they began trading on the TSX Venture exchange on Monday with investors expecting fast-growing demand in the fledgling industry.

The companies are the first major alternatives to Tweed Marijuana Inc, which was listed in April. The offerings mean three of the 13 medical marijuana producers licensed by regulator Health Canada are now public.

Investors piled into the two stocks, pushing them well above their issued prices of 85 Canadian cents per share.

Both retail and institutional investors are showing strong interest in the Canadian medical marijuana industry, which the government projects will reach C$1.3 billion in a decade.

Bedrocan shares advanced to C$1.20, while OrganiGram gained to C$1.94. More than 4 million Bedrocan shares had changed hands by early afternoon, making it the second most heavily traded stock on the venture exchange.

"It speaks to the appetite out there for marijuana names with licenses," Jacob Securities analyst Khurram Malik said.