This week, the overall grades of 21 Oil Gas & Consumable Fuels stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Concho Resources Inc. (CXO) is having a tough week. The company’s rating falls 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, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CXO stock.

This week, Adams Resources & Energy, Inc. (AE) drops from a C to a D rating. Adams Resources & Energy, Inc. engages in marketing crude oil, natural gas, and petroleum products. The company also gets F’s in sales growth, operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of AE stock.

Genesis Energy, L.P. (GEL) experiences a ratings drop this week, going from last week’s C to a D. Genesis Energy, L.P. is involved in the oil and gas industry in the Gulf Coast region of the United States. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of GEL stock.

Slipping from a C to a D rating, Sasol Limited Sponsored ADR (SSL) takes a hit this week. Sasol Limited Sponsored ADR is an integrated energy and chemicals company with production facilities in South Africa, Europe, North America and Asia. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of SSL stock.

Continental Resources, Inc. (CLR) earns a F this week, moving down from last week’s grade of D. Continental Resources, Inc. explores for, develops, and produces oil and natural gas properties in the United States. 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 CLR stock.

This is a rough week for Martin Midstream Partners L.P. (MMLP). The company’s rating falls to D from the previous week’s C. 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, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of MMLP stock.

This week, Calumet Specialty Products Partners, L.P.’s (CLMT) rating worsens to a D from the company’s C rating a week ago. Calumet Specialty Products Partners, L.P. produces hydrocarbon products in North America. The company also gets F’s in sales growth, earnings growth, earnings revisions, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CLMT stock.

Hoegh LNG Partners LP (HMLP) slips from a C to a D this week. The company also gets F’s in sales growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of HMLP stock.

Golar LNG Limited’s (GLNG) rating weakens this week, dropping to a F versus last week’s D. Golar LNG Limited is a shipping company which acquires, owns, operates, and charters liquefied natural gas (LNG) carriers and floating storage regasification units. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of GLNG stock.

Memorial Resource Development Corp (MRD) declines this week from a C to a D. 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.

SM Energy Company (SM) gets weaker ratings this week as last week’s D drops to a F. SM Energy Company is an independent energy company that explores, exploits, develops, acquires and produces natural gas and crude oil in the United States. The company also gets F’s in sales growth, earnings growth, earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SM stock.

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

Renewable Energy Group, Inc. (REGI) experiences a ratings drop this week, going from last week’s C to a D. Renewable Energy Group, Inc. engages in the production, marketing and distribution of biodiesel and its co-products in the United States. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of REGI stock.

Slipping from a C to a D rating, Midcoast Energy Partners LP Class A (MEP) takes a hit this week. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of MEP stock.

This is a rough week for Scorpio Tankers Inc. (STNG). The company’s rating falls to D from the previous week’s C. Scorpio Tankers Inc. provides seaborne transportation of crude oil and other petroleum products worldwide. The company also gets F’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of STNG stock.

Capital Product Partners LP (CPLP) earns a F this week, moving down from last week’s grade of D. Capital Product Partners LP charters its vessels to be engaged in the seaborne transportation services of crude oil and refined petroleum products, edible oils, and soft chemicals. The company also gets F’s in earnings revisions, earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CPLP stock.

EP Energy Corp. Class A (EPE) declines this week from a C to a D. The company also gets F’s in sales growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of EPE stock.

Bonanza Creek Energy, Inc.’s (BCEI) rating weakens this week, dropping to a F versus last week’s D. Bonanza Creek Energy, Inc. is an independent oil and natural gas company. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of BCEI stock.

Sanchez Energy Corporation (SN) gets weaker ratings this week as last week’s D drops to a F. Sanchez Energy Corporation is an independent exploration and production company focused on the exploration, acquisition and development of unconventional oil and natural gas resources. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SN stock.

This week, Jones Energy, Inc. Class A (JONE) drops from a D to a F rating. The company also gets F’s in sales growth, earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of JONE stock.

Navios Maritime Acquisition Corporation (NNA) slips from a C to a D this week. Navios Maritime Acquisition Corporation is an owner and operator of tanker vessels focusing in the transportation of petroleum products (clean and dirty) and bulk liquid chemicals. For more information, get Portfolio Grader’s complete analysis of NNA 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.