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

Fluor (NYSE: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. In Portfolio Grader’s specific subcategory of Earnings Growth, FLR also gets an F. The stock price has fallen 5.6% over the past month, worse than the 0.5% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of FLR stock.

This is a rough week for Foster Wheeler (NASDAQ:FWLT). The company’s rating falls to D from the previous week’s C. Foster Wheeler AG provides design, engineering, construction, manufacturing, project development and management, research, plant operations, and environmental services. The stock also gets an F in Sales Growth. Investors seem to agree with the downgrade and have pushed down the share price 9.6% over the past month. To get an in-depth look at FWLT, get Portfolio Grader’s complete analysis of FWLT stock.

Sterling Construction (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. 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.