Holders of GCAN can trade their shares. This excerpt taken directly from the S1 shows how...
"There is not yet an established public trading market for our securities. Hence, there is no central place, such as a stock exchange or electronic trading system, to resell common stock. As such, stockholders will have to locate a buyer and negotiate a private sale until a market is established."
Sure does not sound like a typical IPO to me. Seems like until a market is established all sales, transfers, or dealings in shares is "private".