This week, the ratings of three capital markets stocks on Portfolio Grader are down. 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. Shares of the stock are changing hands at twice the rate they were a week ago. The stock currently has a trailing PE Ratio of 31.40. For more information, get Portfolio Grader’s complete analysis of AMG stock.

GFI Group (GFIG) is having a tough week. The company’s rating falls 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. Shares of the stock are being traded at a very rapid pace, up 517.5% from the week prior. To get an in-depth look at GFIG, get Portfolio Grader’s complete analysis of GFIG stock.

Medallion Financial (TAXI) earns a D this week, moving down from last week’s grade of 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. For a full analysis of TAXI stock, visit Portfolio Grader.

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.