On the Portfolio Grader database this week, the energy services, electrical equipment, distributors, construction and engineering and marine sectors are among the worst.

The energy services sector looks weak, with 91% of its stocks (52 out of 57) rated a “sell”. CARBO Ceramics (CRR), Transocean (RIG) and Seadrill (SDRL) are pushing the sector down with F grades.

With 64% of its stocks (16 out of 25) rated “sell,” the electrical equipment sector is struggling this week. With an overall grade of F, General Cable Corporation (BGC), Encore Wire Corporation (WIRE) and ABB Ltd. Sponsored ADR (ABB) are weighing down the sector.

The distributors sector is dragging, with 58% of its stocks (14 out of 24) rated a “sell”. Out of the distributors stocks, WESCO International, Inc. (WCC) and Applied Industrial Technologies, Inc. (AIT) are near the bottom of the sector with D’s. Beacon Roofing Supply, Inc. (BECN) also ranks a weak F.

The construction and engineering sector is lagging this week with 57% of its stocks (12 out of 21) rated a “sell”. Empresas ICA SAB de CV Sponsored ADR (ICA), KBR, Inc. (KBR) and Jacobs Engineering Group (JEC) are dragging down the sector overall, each earning a low grade of F.

The marine sector is trailing behind others this week, with 57% of its stocks (4 out of 7) rated a “sell”. At the bottom of the marine stocks, Seaspan Corporation (SSW) and Kirby Corporation (KEX) currently have F’s. Navios Maritime Partners LP (NMM) also has a weak D.

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.