 Shares of urban-gro Inc. plummeted 74.3 in premarket trading, on the same day that they are slated to move over to the Nasdaq from the OTCQX Marketplace, after a large stock offering priced at a deep discount. Colorado-based Urban-gro, which makes commercial controlled environment agriculture facilities, said late Thursday that its public offering of 5.4 million shares price at 10 a share, but the stock had closed Thursday at 47.00. 