Too many times retailers ignore the one simple rule to get customers to come back. And what is that? Treat them well. According to a study by ForeSee Results and FGI Research, along with the University of Michigan’s American Customer Satisfaction Index, the top in customer satisfaction over the holidays were Amazon and Netflix.

most improved are Wal-Mart.com and HP’s online store. Other gainers include Staples and Target.com.

The largest declines were for Home Shopping Network and Gap.

Bummer for the Gap who has really seen their stock and sales take a hit these past few years. Read more about the study and to see the top 40 here.