This week, these five stocks have the worst ratings in Surprise, one of the eight Fundamental Categories on Portfolio Grader.

VAALCO Energy, Inc. (EGY) is an independent energy company, which is mainly engaged in the acquisition, exploration, development and production of crude oil and natural gas. The company also gets F’s in sales growth, operating margin growth, and earnings growth. For more information, get Portfolio Grader’s complete analysis of EGY stock.

Core Laboratories NV (CLB) serves the oil and gas industry by providing it with proprietary and patented reservoir description, production enhancement, and reservoir management services. The company also gets F’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of CLB stock.

EMC Insurance Group Inc. (EMCI) focuses on the sale of commercial lines of property and casualty insurance to small and medium-sized businesses, institutions, and individual customers through independent insurance agents. For more information, get Portfolio Grader’s complete analysis of EMCI stock.

Post Properties, Inc. (PPS) develops and operates upscale multi-family apartment communities in the Southeastern and Southwestern United States. The company also gets F’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of PPS stock.

Validus Holdings, Ltd. (VR) provides reinsurance and insurance coverage in the property and marine markets. For more information, get Portfolio Grader’s complete analysis of VR 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.