This week, the ratings of 3 Construction & Engineering stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Layne Christensen Company (LAYN) declines this week from a C to a D. Layne Christensen Company provides water well drilling, mineral exploration drilling, geotechnical construction, oil and gas services, and related products and services. The company also gets F’s in earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of LAYN stock.

Great Lakes Dredge & Dock Corporation’s (GLDD) rating weakens this week, dropping to a F versus last week’s D. Great Lakes Dredge & Dock Corporation is in the business of marine construction and commercial and industrial demolition. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of GLDD stock.

Abengoa SA Sponsored ADR Class B (ABGB) slips from a D to a F this week. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of ABGB 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.