The overall ratings of 4 Construction & Engineering stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Chicago Bridge & Iron Co. NV’s (CBI) rating worsens to a D from the company’s C rating a week ago. Chicago Bridge & Iron Co. NV provides conceptual design, technology, engineering, construction, commissioning and associated maintenance services to customers in the energy and natural resource industries. The company also gets F’s in operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CBI stock.

AECOM (ACM) slips from a C to a D this week. AECOM provides government and commercial clients with technical and management support services. The company also gets F’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of ACM stock.

This is a rough week for Primoris Services Corporation (PRIM). The company’s rating falls to D from the previous week’s C. Primoris Services Corporation provides construction, fabrication, maintenance, replacement, and engineering services to public utilities, petrochemical companies, energy companies, municipalities, and other customers. For more information, get Portfolio Grader’s complete analysis of PRIM stock.

This week, Abengoa SA Sponsored ADR Class B (ABGB) drops from a C to a D rating. The company also gets F’s in sales growth, earnings revisions, 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.