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”).

Shutterfly‘s (NASDAQ:SFLY) rating falls this week to a F (“strong sell”), down from last week’s D (“sell”). Shutterfly is an Internet-based social expression and personal publishing service that enables consumers to share, print and preserve their memories by leveraging its technology, manufacturing, web-design and merchandising capabilities. In Portfolio Grader’s specific subcategories of Earnings Momentum and Margin Growth, SFLY also gets F’s. As of Oct. 8, 2012, 22.7% of outstanding Shutterfly shares were held short. The stock currently has a trailing PE Ratio of 140.70. For a full analysis of SFLY stock, visit Portfolio Grader.

Amazon.com‘s (NASDAQ:AMZN) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Amazon.com sells a variety products on its web site, in addition to making and selling the Kindle e-reader. In Earnings Growth, Earnings Revisions, Earnings Surprise, and Margin Growth the stock gets F’s. The stock has a trailing PE Ratio of 319.10. To get an in-depth look at AMZN, get Portfolio Grader’s complete analysis of AMZN stock.

MakeMyTrip (NASDAQ:MMYT) earns a F this week, moving down from last week’s grade of D. Makemytrip operates websites that allow travelers to research and plan trips and book airline tickets, hotels, packages, rail tickets, bus tickets, and rental cars. The stock also gets an F in Earnings Growth. The trailing PE Ratio for the stock is 108.10. For more information, get Portfolio Grader’s complete analysis of MMYT 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.