This week, the ratings of 6 Specialty Retail stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

AutoZone, Inc. (AZO) is having a tough week. The company’s rating falls from a C to a D. AutoZone, Inc. is an automotive parts and accessories retailer. For more information, get Portfolio Grader’s complete analysis of AZO stock.

O’Reilly Automotive, Inc. (ORLY) earns a D this week, moving down from last week’s grade of C. O’Reilly Automotive, Inc. retails and supplies automotive aftermarket parts, tools, supplies, equipment, and accessories. For more information, get Portfolio Grader’s complete analysis of ORLY stock.

This week, Signet Jewelers Limited (SIG) drops from a D to a F rating. Signet Jewelers Limited is engaged in the retailing of jewelry, watches and gifts with branches throughout UK and US. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of SIG stock.

Group 1 Automotive, Inc. (GPI) declines this week from a D to a F. Group 1 Automotive, Inc. owns and operates automobile dealerships. For more information, get Portfolio Grader’s complete analysis of GPI stock.

Monro Muffler Brake, Inc.’s (MNRO) rating weakens this week, dropping to a F versus last week’s D. Monro Muffler Brake, Inc. operates a chain of Company owned stores in the Northeast US providing automotive undercar repair and tire services in the Eastern region of the US. For more information, get Portfolio Grader’s complete analysis of MNRO stock.

This week, Express, Inc.’s (EXPR) rating worsens to a F from the company’s D rating a week ago. Express, Inc. operates specialty retail apparel stores throughout the United States that target women and men between 20 and 30 years old. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of EXPR 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.