Walmart's Canadian unit said on Tuesday it is exploring the possibility of selling cannabis-based products, but has no immediate plans to get into the business.
The company's shares rose 2.1 percent to $96.67 in late morning trading.
Walmart is the first major retailer to show an interest in being part of Canada's burgeoning marijuana industry, as other big U.S. companies, mainly in the alcohol and beverage industries, begin to seriously consider entering the market for cannabis-infused products.
Last month Coca-Cola said it was closely watching the marijuana drinks market for a possible entry, while Corona beer maker Constellation Brands has invested more than $4 billion in cannabis producer Canopy Growth.
"As we would for any new industry, Walmart Canada has done some preliminary fact-finding on this issue, but we do not have plans to carry CBD products at this time," Walmart spokeswoman Diane Medeiros told Reuters.
Cannabidiol or CBD is the non-psychoactive chemical found in marijuana and does not cause intoxication.
