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. In 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 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.

Sterling Construction Company, Inc. (NASDAQ:STRL) experiences a ratings drop this week, going from last week’s 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. For more information, 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.