CannTrust Holdings Inc. took a major step Monday toward persuading investors that it is one of the world’s most important cannabis companies by listing on the New York Stock Exchange. CannTrust CTST, -8.58% TRST, -6.50% CTST, -8.58% has not yet inked an eye-popping deal like Cronos Group Inc.’s CRON, -7.62% CRON, -7.32% $1.8 billion investment from Altria Group Inc.