The overall ratings of three Construction and Engineering stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Fluor (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. To get an in-depth look at FLR, get Portfolio Grader’s complete analysis of FLR stock.

The rating of Foster Wheeler (NASDAQ:FWLT) slips from 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. The stock price has dropped 16.7% over the past month, worse than the 1.8% increase the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of FWLT stock.

Slipping from C to a D rating, Sterling Construction (NASDAQ:STRL) takes a hit this week. Sterling Instruction Company is a heavy civil construction company that specializes in the building, reconstruction and repair of transportation and water infrastructure. 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.