U.S. Markets close in 1 hr 51 mins

Amazon, American Express and Sleep Number are the charts of the day.

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.