This week, the overall grades of three capital markets stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Affiliated Managers Group, Inc. (AMG) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Affiliated Managers operates as an asset management company providing investment management services to mutual funds, institutional clients, and high net worth individuals in the United States. The stock currently has a trailing PE Ratio of 30.20. To get an in-depth look at AMG, get Portfolio Grader’s complete analysis of AMG stock.

This week, GFI Group (GFIG) drops from a C to a D rating. GFI Group provides brokerage services and data and analytics products to institutional clients. The stock also rates an F in Earnings Revisions. The stock price has fallen 5.8% over the past month, worse than the 1.7% decrease the S&P 500 has seen over the same period of time. Trade volume is up 1246% from the previous week. For a full analysis of GFIG stock, visit Portfolio Grader.

Medallion Financial (TAXI) is having a tough week. The company’s rating falls from a C to a D. Medallion Financial is a specialty finance company that originates and services loans financing the purchase of taxicab medallions and related assets. The stock also gets an F in Earnings Surprise. At $13.49, the stock is under the 50-day moving average of $13.73. Shares of the stock are being traded at a very rapid pace, up 665.1% from the week prior. For more information, get Portfolio Grader’s complete analysis of TAXI 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.