This week, the ratings of three e-commerce stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

1-800-FLOWERS.COM, Inc. Class A (FLWS) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. 1-800-Flowers.com provides customers around the world with the freshest flowers and finest selection of plants, gift baskets, gourmet foods and confections, and plush stuffed animals perfect for every occasion. The stock has a trailing PE Ratio of 26.40. For a full analysis of FLWS stock, visit Portfolio Grader.

PetMed Express, Inc. (PETS) earns a D this week, falling from last week’s grade of C. PetMed Express offers prescription and nonprecription pet medications, as well as health and nutritional supplements. As of April 7, 2014, 17.4% of outstanding PetMed Express, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of PETS stock.

This week, Amazon.com, Inc. (AMZN) drops from a C to a D rating. Amazon.com is an online retailer that offers a wide range of products. The stock gets F’s in Earnings Revisions and Earnings Surprise. The stock price has fallen 10% over the past month, worse than the 1.3% decrease the Nasdaq has seen over the same period of time. The stock currently has a trailing PE Ratio of 572.40. To get an in-depth look at AMZN, get Portfolio Grader’s complete analysis of AMZN stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.