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. (AMG) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. 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. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. The stock’s trailing PE Ratio is 31.10. To get an in-depth look at AMG, get Portfolio Grader’s complete analysis of AMG stock.

Slipping from a C to a D rating, GFI Group (GFIG) takes a hit this week. GFI Group provides brokerage services and data and analytics products to institutional clients. The stock also rates an F in Earnings Revisions. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. For a full analysis of GFIG stock, visit Portfolio Grader.

Medallion Financial’s (TAXI) rating weakens this week, dropping to a D versus last week’s C. 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. 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.