This week, 4 Semiconductors & Semiconductor Equipment stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Semtech Corporation (SMTC) drops from a D to a F rating. Semtech Corporation is involved in the design, production and marketing of products that are sold primarily into applications within the high-end consumer, industrial, and computing and communications markets. The company also gets F’s in sales growth, earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SMTC stock.

CVD Equipment Corporation (CVV) experiences a ratings drop this week, going from last week’s C to a D. CVD Equipment Corporation develops, manufactures, and markets chemical vapor deposition equipment, annealing furnaces, and etching systems. For more information, get Portfolio Grader’s complete analysis of CVV stock.

Advanced Semiconductor Engineering, Inc. Sponsored ADR (ASX) slips from a C to a D this week. Advanced Semiconductor Engineering, Inc. Sponsored ADR is an independent provider of semiconductor packaging and testing services. For more information, get Portfolio Grader’s complete analysis of ASX stock.

Slipping from a C to a D rating, O2Micro International Limited Sponsored ADR (OIIM) takes a hit this week. O2Micro International Limited Sponsored ADR designs, develops, and markets integrated circuits for power management and computer security applications. The company also gets F’s in earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of OIIM 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.