This week, the ratings of three health care provider stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

USMD Holdings, Inc.’s (USMD) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). In Portfolio Grader’s specific subcategories of Earnings Growth and Margin Growth, USMD also gets F’s. Shares of the stock have been trading at an exceptionally rapid pace, up fourfold from the week prior. For a full analysis of USMD stock, visit Portfolio Grader.

National Research Corporation Class A’s (NRCIA) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. The stock also gets an F in Earnings Growth. To get an in-depth look at NRCIA, get Portfolio Grader’s complete analysis of NRCIA stock.

This week, LifePoint Hospitals, Inc. (LPNT) drops from a C to a D rating. LifePoint Hospitals operates acute care hospitals that provide a range of medical and surgical services, including general surgery, internal medicine, obstetrics, emergency room care, oncology and rehabilitation services. The stock also gets an F in Earnings Revisions. Trade volume is up 470% from the previous week. For more information, get Portfolio Grader’s complete analysis of LPNT 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.