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”).

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. The stock currently has a trailing PE Ratio of 36.90. For more information, get Portfolio Grader’s complete analysis of FLWS stock.

Amazon.com, Inc. (AMZN) is having a tough week. The company’s rating falls from a C to a D. 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 has a trailing PE Ratio of 468.90. For a full analysis of AMZN 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 May 20, 2014, 20.5% of outstanding PetMed Express, Inc. shares were held short. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. To get an in-depth look at PETS, get Portfolio Grader’s complete analysis of PETS 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.