Like I told you last month, the understatement of the century is that the mortgage crisis has been hard on banks — the implosions of Lehman Brothers and Bank of America (NYSE:BAC) are prime examples of this. It’s not getting any easier for these troubled “thrifts” because some of the same companies that I told you about in November are still on my list of stocks to get rid of in December.

I watch more than 5,000 publicly traded companies with my Portfolio Grader tool, ranking companies by a number of fundamental and quantitative measures. And this week, I have six thrifts and mortgage finance stocks to sell.

Here they are, in alphabetical order. Each one of these stocks gets a “D” or “F” according to my research, meaning it is a “sell” or “strong sell.”

Astoria Financial (NYSE:AF) is a unitary savings and loan association. AF stock has dipped 38% year-to-date, compared to a gain of almost 6% for the Dow Jones in the same period. AF gets an “F” for sales growth, a “D” for earnings growth, an “F” for earnings momentum, an “F” for its ability to exceed the consensus earnings estimates on Wall Street and a “D” for the magnitude in which earnings projections have increased over the past month in my Portfolio Grader tool. For more information, view my complete analysis of AF stock.

First Niagara Financial Group (NASDAQ:FNFG) is a provider of numerous retail and commercial banking and other financial services. Year-to-date, FNFG tock has slid nearly 38%. FNFG stock gets a “D” for operating margin growth, a “D” for earnings growth, a “D” for earnings momentum, a “D” for its ability to exceed the consensus earnings estimates on Wall Street, a “D” for the magnitude in which earnings projections have increased over the past month and a “D” for cash flow in my Portfolio Grader tool. For more information, view my complete analysis of FNFG stock.

Hudson City Bancorp (NASDAQ:HCBK) is a holding company for its principal subsidiary, Hudson City Savings Bank. Since the start of 2011, HCBK stock has slid 51%. HCBK stock gets an “F” for sales growth, an “F” for operating margin growth, a “D” for earnings growth, an “F” for its ability to exceed the consensus earnings estimates on Wall Street, an “F” for the magnitude in which earnings projections have increased over the past month and an “F” for sales growth in my Portfolio Grader tool. For more information, view my complete analysis of HCBK stock.

MGIC Investment (NYSE:MTG) is a provider of private mortgage insurance. MTG’s 2011 performance has been abysmal, down 65% in the last 12 months. MTG stock gets an “F” for sales growth, an “F” for earnings momentum, an “F” for the magnitude in which earnings projections have increased over the past month, an “F” for cash flow and an “F” for return on equity in my Portfolio Grader tool. For more information, view my complete analysis of MTG stock.

New York Community Bancorp (NYSE:NYB) is a bank holding company that makes multifamily mortgage loans. Since Jan. 1, NYB stock has slipped 34%. NYB gets an “F” for sales growth, a “D” for operating margin growth, a “D” for earnings growth and a “D” for its ability to exceed the consensus earnings estimates on Wall Street in my Portfolio Grader tool. For more information, view my complete analysis of NYB stock.

Radian Group (NYSE:RDN) is a credit enhancement company and is the biggest loser on this list. RDN stock is down an astonishing 72% year-to-date. RDN stock gets an “F” for sales growth, an “F” for cash flow and an “F” for return on equity in my Portfolio Grader tool. For more information, view my complete analysis of RDN stock.

Get more analysis of these picks and other publicly traded stocks with Louis Navellier’s Portfolio Grader tool, a 100% free stock rating tool that measures both quantitative buying pressure and eight fundamental factors.