Let's check out the Yahoo Finance charts of the day.
Amazon (AMZN): Shares are higher in early trade, up around 2%. In his annual letter, CEO Jeff Bezos revealed the online giant had amassed over 100 million Prime members worldwide.
American Express (AXP): Shares climbing here, up 6%. The credit card company beat on earnings, with its forecast topping estimates as well.
Sleep Number (SNBR): Shares slipping here, down around 15%. The mattress retailer missed on revenue and comparable-store sales fell more than expected.
For more on today's big stock movers check out the Final Round, live at 3:55 p.m. ET, right here on Yahoo Finance.