The grades of three Mortgage stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Walker & Dunlop (NYSE:WD) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Walker & Dunlop is a provider of commercial real estate financial services in the United States, with a primary focus on multifamily lending. In Portfolio Grader’s specific subcategories of Equity, Cash Flow, and Margin Growth, WD also gets A’s. Shares of WD have increased 21.7% over the past month, better than the 1.6% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of WD stock.

This is a strong week for Hudson City Bancorp (NASDAQ:HCBK). The company’s rating climbs to B from the previous week’s C. Hudson City Bancorp is a bank holding company. Investors have pushed the stock price up 8.2% over the past month. For more information, get Portfolio Grader’s complete analysis of HCBK stock.

America First Tax Exempt Investors (NASDAQ:ATAX) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. America First Tax Exempt Investors engages in acquiring, holding, selling, and dealing with a portfolio of federally tax-exempt mortgage revenue bonds, which have been issued to provide construction and/or permanent financing of multifamily residential apartments. For more information, get Portfolio Grader’s complete analysis of ATAX 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.