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

This week, 1-800-FLOWERS.COM, Inc. Class A (FLWS) falls to a D (“sell”), worse than last week’s grade of C (“hold”). 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. Shares of the stock are changing hands at twice the rate they were a week ago. The trailing PE Ratio for the stock is 25.60. For a full analysis of FLWS stock, visit Portfolio Grader.

PetMed Express, Inc. (PETS) experiences a ratings drop this week, going from last week’s C to a D. PetMed Express offers prescription and nonprecription pet medications, as well as health and nutritional supplements. As of March 24, 2014, 15.7% of outstanding PetMed Express, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of PETS stock.

Amazon.com, Inc.’s (AMZN) rating weakens this week, dropping to a D versus last week’s C. Amazon.com is an online retailer that offers a wide range of products. The stock gets F’s in Earnings Revisions and Earnings Surprise. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. The stock currently has a trailing PE Ratio of 643.50. 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.