Cannabis review site Weedmaps agrees $1.5 billion deal to go public By Joshua Franklin FILE PHOTO: Customers shop for "Green Friday" deals at the Grass Station marijuana shop on Black Friday in Denver (Reuters) – WM Holding Company, a cannabis technology company which operates the online U.S. platform Weedmaps where users find and rate marijuana sellers, said on Thursday it has agreed to go public through a merger with Silver Spike Acquisition Corp. The deal to take Weedmaps public, which values the company at around $1.5 billion, is a rare example of a business focused on the cannabis sector listing on a U.S. stock exchange.