Stocks to watch for Thursday:Twilio (TWLO) - the cloud communications provider failed to close above $26 and break the downtrend that would make Twilio a buy. Sprint (S) - the wireless laggard launched a promotion to give away wireless service for a year. The company argues that the customer acquisition cost is low due to online signup, but the move smacks as desperation. The race to zero makes Sprint a stock to avoid. Alexion Pharma (ALXN) - the market viewed the hiring of an industry vet favorably sending the stock up an incredible $10. The move has likely only started as the executive issues were the only real reason to not own the stock. Ambarella (AMBA) - the close below $50 was a bad sign. The market doesn't appear too fond of waiting for computer vision chips as the company loses out on drones. Constantly rotating out of top categories isn't going to grow the business. Click on the Sign in/Sign up button in the top right corner to join for free to comment on your stock moves for tomorrow. Click on the Follow button to get daily blog posts from Out Fox The $treet.Disclosure: No position