The overall ratings of three e-commerce stocks are down on Portfolio Grader this week. 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. The trailing PE Ratio for the stock is 26.60. For a full analysis of FLWS stock, visit Portfolio Grader.

PetMed Express, Inc.’s (PETS) rating weakens this week, dropping to a D versus last week’s C. PetMed Express offers prescription and nonprecription pet medications, as well as health and nutritional supplements. At $13.15, the stock is under the 50-day moving average of $13.35. As of April 21, 2014, 18.4% of outstanding PetMed Express, Inc. shares were held short. For more information, get Portfolio Grader’s complete analysis of PETS stock.

This is a rough week for Amazon.com, Inc. (AMZN). The company’s rating falls to D from the previous 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. The stock price has dropped 10.2% over the past month, worse than the 1.3% decrease the Nasdaq has seen over the same period of time. The stock’s trailing PE Ratio is 557.50. 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.