For the current week, the overall ratings of three capital markets stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

GFI Group’s (GFIG) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. GFI Group provides brokerage services and data and analytics products to institutional clients. GFIG also rates an F in Portfolio Grader’s specific subcategory of Earnings Revisions. For a full analysis of GFIG stock, visit Portfolio Grader.

This is a rough week for Medallion Financial (TAXI). The company’s rating falls to D from the previous 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.

This week, Affiliated Managers Group, Inc. (AMG) drops from a C to a D rating. 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 32.20. For more information, get Portfolio Grader’s complete analysis of AMG 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.