The overall ratings of 18 Oil Gas & Consumable Fuels stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Concho Resources Inc. (CXO) declines this week from a C to a D. Concho Resources Inc. engages in the acquisition, exploration, and development of oil and natural gas properties in the United States. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CXO stock.

This week, EQT Corporation’s (EQT) rating worsens to a F from the company’s D rating a week ago. EQT Corporation offers energy products, primarily natural gas and NGLs, and services to wholesale and retail customers in the United States. The company also gets F’s in sales growth, operating margin growth, earnings revisions, earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of EQT stock.

Marathon Petroleum Corporation (MPC) gets weaker ratings this week as last week’s C drops to a D. Marathon Petroleum Corporation is a supplier of gasoline and distillates to resellers and consumers. The company also gets F’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of MPC stock.

TransCanada Corporation (TRP) earns a D this week, moving down from last week’s grade of C. TransCanada Corporation develops and operates energy infrastructures, including natural gas pipelines. 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 TRP stock.

This is a rough week for Spectra Energy Corp (SE). The company’s rating falls to D from the previous week’s C. Spectra Energy Corp owns and operates a portfolio of natural gas-related energy assets. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SE stock.

Pembina Pipeline Corporation’s (PBA) rating weakens this week, dropping to a D versus last week’s C. Pembina Pipeline Corporation transports, stores, and markets petroleum products. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of PBA stock.

YPF SA Sponsored ADR Class D (YPF) is having a tough week. The company’s rating falls from a C to a D. YPF SA Sponsored ADR Class D is an energy company operating a fully integrated oil and gas chain with market positions across the domestic upstream and downstream segments. The company also gets F’s in earnings surprise and free cash flow. For more information, get Portfolio Grader’s complete analysis of YPF stock.

This week, Martin Midstream Partners L.P. (MMLP) drops from a D to a F rating. Martin Midstream Partners L.P. provides marine transportation, terminalling, distribution and logistical services for producers and suppliers of hydrocarbon products, specialty chemicals and other liquids. The company also gets F’s in sales growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of MMLP stock.

Slipping from a C to a D rating, Arc Logistics Partners LP (ARCX) takes a hit this week. The company also gets F’s in operating margin growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of ARCX stock.

Memorial Resource Development Corp (MRD) slips from a D to a F this week. The company also gets F’s in sales growth, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of MRD stock.

Scorpio Tankers Inc. (STNG) experiences a ratings drop this week, going from last week’s C to a D. Scorpio Tankers Inc. provides seaborne transportation of crude oil and other petroleum products worldwide. The company also gets F’s in earnings revisions and free cash flow. For more information, get Portfolio Grader’s complete analysis of STNG stock.

Slipping from a C to a D rating, Blueknight Energy Partners, L.P. (BKEP) takes a hit this week. Blueknight Energy Partners, L.P. provides integrated terminalling, storage, processing, gathering, and transportation services for companies engaged in the production, distribution, and marketing of crude oil and asphalt products in the United States. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of BKEP stock.

Pacific Ethanol Inc (PEIX) is having a tough week. The company’s rating falls from a D to a F. Pacific Ethanol Inc produces and markets low-carbon ethanol. 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 PEIX stock.

This week, StealthGas Inc.’s (GASS) rating worsens to a F from the company’s D rating a week ago. StealthGas Inc. offers marine transport services for liquefied petroleum gas producers and users. The company also gets F’s in operating margin growth, earnings revisions, and free cash flow. For more information, get Portfolio Grader’s complete analysis of GASS stock.

This week, Chesapeake Granite Wash Trust (CHKR) drops from a C to a D rating. Chesapeake Granite Wash Trust owns royalty interests in oil and natural gas producing wells. For more information, get Portfolio Grader’s complete analysis of CHKR stock.

This is a rough week for Vanguard Natural Resources, LLC (VNR). The company’s rating falls to F from the previous week’s D. Vanguard Natural Resources, LLC is an independent natural gas and oil company. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of VNR stock.

Overseas Shipholding Group Inc Class B (OSGB) gets weaker ratings this week as last week’s D drops to a F. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of OSGB stock.

Aemetis, Inc. (AMTX) experiences a ratings drop this week, going from last week’s D to a F. The company also gets F’s in sales growth, operating margin growth, earnings growth, and free cash flow. For more information, get Portfolio Grader’s complete analysis of AMTX 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.