Stocks to watch on Friday: Costco (COST) - the company reported 5% comp sales growth and 7% revenue growth, but the stock trades at 35x EPS estimates. The market is far too hot on the top retailers. Investors should look to unload positions near $300 as the valuation suggests years of underperformance, if not out right losses. CannTurst (CTST) - Health Canada has basically put the company out of business for failing an audit. The only hope is likely a sale of the business, but investors shouldn't expect a deal to top the current market price of $150 million. Don't touch CannTrust still above $1. Nio (NIO) - Goldman Sachs finally cuts a Buy rating on the EV company placing a $1.47 price target on the stock. Investors have no reason to speculate on this stock. Investors looking for a stock to speculate can purchase Fitbit (FIT) with a strong balance sheet and a major catalyst in the transition to premium health and fitness services. No reason to go all the way to China where a lack of transparency exists. Disclosure: Long FIT