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

Fluor Corporation (FLR) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Fluor Corporation provides professional services in the fields of engineering, procurement, construction and maintenance as well as project management services on a global basis. FLR also rates an F in Portfolio Grader’s specific subcategory of Earnings Growth. The stock has a trailing PE Ratio of 25.60. For more information, get Portfolio Grader’s complete analysis of FLR stock.

This week, Foster Wheeler’s (FWLT) rating worsens to a D from the company’s C rating a week ago. Foster Wheeler provides design, engineering, construction, manufacturing, project development and management, research, plant operations, and environmental services. The stock also rates an F in Sales Growth. For a full analysis of FWLT stock, visit Portfolio Grader.

Sterling Construction Company, Inc. (STRL) is having a tough week. The company’s rating falls from a C to a D. Sterling Instruction Company is a heavy civil construction company that specializes in the building, reconstruction and repair of transportation and water infrastructure. The stock receives F’s in Earnings Growth, Earnings Revisions and Earnings Surprise. Equity, Cash Flow and Margin Growth also get F’s. To get an in-depth look at STRL, get Portfolio Grader’s complete analysis of STRL 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.