The overall ratings of three capital markets stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Affiliated Managers Group, Inc.’s (AMG) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. 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 trailing PE Ratio for the stock is 32.80. To get an in-depth look at AMG, get Portfolio Grader’s complete analysis of AMG stock.

GFI Group (GFIG) earns a D this week, falling from last week’s grade of C. GFI Group provides brokerage services and data and analytics products to institutional clients. The stock also gets an F in Earnings Revisions. The stock price has dropped 10.4% 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.

Slipping from a C to a D rating, Medallion Financial (TAXI) takes a hit this week. Medallion Financial is a specialty finance company that originates and services loans financing the purchase of taxicab medallions and related assets. The stock also rates an F in Earnings Surprise. Share prices fell 8.3% over the past month. 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.