For the week, the worst sectors according to Portfolio Grader are the reit, water utilities, independent power and renewable electricity producers, metals and mining and energy services sectors.

With 80% of its stocks (127 out of 159) rated “sell,” the reit sector is struggling this week. Hatteras Financial (HTS), DDR Corp. (DDR) and Health Care REIT, Inc. (HCN) are dragging down the sector overall, each earning a low grade of F.

The water utilities sector looks weak, with 67% of its stocks (4 out of 6) rated a “sell”. Out of the water utilities stocks, Companhia de Saneamento Basico do Estado de Sao Paulo SABESP Sponsored ADR (SBS), SJW Corp. (SJW) and Aqua America, Inc. (WTR) are near the bottom with D’s.

The independent power and renewable electricity producers sector is trailing behind others this week, with 67% of its stocks (6 out of 9) rated a “sell”. TransAlta Corporation (TAC), Empresa Nacional de Electricidad S.A. Sponsored ADR (EOC) and Calpine Corporation (CPN) are all currently earning F’s.

The metals and mining sector is dragging, with 66% of its stocks (61 out of 92) rated a “sell”. With an overall grade of F, Newmont Mining Corporation (NEM), Gold Fields Limited Sponsored ADR (GFI) and Schnitzer Steel Industries, Inc. Class A (SCHN) are weighing down the sector.

The energy services sector is lagging this week with 60% of its stocks (38 out of 63) rated a “sell”. Among energy services stocks, McDermott International, Inc. (MDR), ION Geophysical Corporation (IO) and Tidewater (TDW) are lingering near the bottom with grades of F.

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.