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’s (FLWS) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. 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. For more information, get Portfolio Grader’s complete analysis of FLWS stock.

This week, PetMed Express, Inc.’s (PETS) rating worsens to a D from the company’s C rating a week ago. PetMed Express offers prescription and nonprecription pet medications, as well as health and nutritional supplements. As of Feb. 24, 2014, 16.5% of outstanding PetMed Express, Inc. shares were held short. To get an in-depth look at PETS, get Portfolio Grader’s complete analysis of PETS stock.

Amazon.com, Inc. (AMZN) is having a tough week. The company’s rating falls from a C to a D. Amazon.com sells a variety products on its web site, in addition to making and selling the Kindle e-reader. The stock gets F’s in Earnings Revisions and Earnings Surprise. The stock price has dropped 14.1% 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 595.00. For a full analysis of AMZN stock, visit Portfolio Grader.

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.