This week, the overall grades of three Financial Services stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

NYSE Euronext‘s (NYSE:NYX) rating falls this week to a F (“strong sell”), down from last week’s D (“sell”). NYSE Euronext operates an international stock exchange. NYX also rates an F in Portfolio Grader’s specific subcategory of Sales Growth. While the S&P 500 has remained flat over the past month, the stock price has fallen 7.9% over the past month. For a full analysis of NYX stock, visit Portfolio Grader.

ING Groep (NYSE:ING) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. ING Groep N. V. offers financial services to individuals, corporations, and other institutions. The stock receives F’s in Earnings Growth, Earnings Momentum, Earnings Surprise, and Sales Growth. The trailing PE Ratio for the stock is 43.70. To get an in-depth look at ING, get Portfolio Grader’s complete analysis of ING stock.

This week, NASDAQ OMX Group‘s (NASDAQ:NDAQ) rating worsens to a F from the company’s D rating a week ago. NASDAQ is a global exchange group that delivers trading, exchange technology, securities listing, and public company services across multiple continents. The stock also gets an F in Sales Growth. For more information, get Portfolio Grader’s complete analysis of NDAQ 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.