The ratings of three capital markets stocks are down this week, 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. At $179.30, the stock is below the 50-day moving average of $190.71. The stock has a trailing PE Ratio of 29.30. For more information, get Portfolio Grader’s complete analysis of AMG stock.

The rating of GFI Group (GFIG) declines this week from a C to a D. 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 6.8% over the past month, worse than the 1.7% decrease the S&P 500 has seen over the same period of time. For a full analysis of GFIG stock, visit Portfolio Grader.

Medallion Financial (TAXI) experiences a ratings drop this week, going from last week’s 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 $13.09, the stock is under the 50-day moving average of $13.65. To get an in-depth look at TAXI, 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.