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”).

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 currently has a trailing PE Ratio of 35.50. To get an in-depth look at FLWS, get Portfolio Grader’s complete analysis of FLWS stock.

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 Dec. 22, 2014, 25.1% of outstanding PetMed Express, Inc. shares were held short. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of PETS stock.

Amazon.com, Inc. (AMZN) earns a D this week, moving down from last week’s grade of 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 trading at an exceptionally rapid pace, up twofold from the week prior. 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.