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”).

This week, Fluor Corporation (NYSE:FLR) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Fluor Corporation provides professional services in the fields of engineering, procurement, construction and maintenance as well as project management services on a global basis. For Portfolio Grader’s specific subcategory of Earnings Growth, FLR also gets an F. For a full analysis of FLR stock, visit Portfolio Grader.

The rating of Foster Wheeler (NASDAQ:FWLT) declines this week from a C to a D. Foster Wheeler AG provides design, engineering, construction, manufacturing, project development and management, research, plant operations, and environmental services. The stock also rates an F in Sales Growth. To get an in-depth look at FWLT, get Portfolio Grader’s complete analysis of FWLT stock.

This is a rough week for Sterling Construction Company, Inc. (NASDAQ:STRL). The company’s rating falls to D from the previous week’s C. Sterling Instruction Company is a heavy civil construction company that specializes in the building, reconstruction and repair of transportation and water infrastructure. The stock rates an F in Earnings Growth, Earnings Revisions, and Earnings Surprise. Equity, Cash Flow, and Margin Growth also get F’s. At $9.66, the stock is under the 50-day moving average of $9.88. For a full analysis of STRL stock, visit Portfolio Grader.

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.