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”).

Fluor Corporation (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. FLR also rates an F in Portfolio Grader’s specific subcategory of Earnings Growth. 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. To get an in-depth look at FWLT, get Portfolio Grader’s complete analysis of FWLT stock.

This week, Sterling Construction Company, Inc. (NASDAQ:STRL) drops from a C to a D rating. 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 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.