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”).

NXP Semiconductors NV (NXPI) experiences a ratings drop this week, going from last week’s C to a D. NXP Semiconductors NV provides mixed signal and standard product solutions for radio frequency (RF), analog, power management, interface, security, and digital processing products worldwide. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of NXPI stock.

This week, Nova Measuring Instruments Ltd (NVMI) drops from a C to a D rating. Nova Measuring Instruments Ltd develops, produces, and markets monitoring and measurement systems for the semiconductor manufacturing industry. For more information, get Portfolio Grader’s complete analysis of NVMI stock.

O2Micro International Limited Sponsored ADR (OIIM) declines this week from a D to a F. 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 return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of OIIM stock.

This is a rough week for Intermolecular, Inc. (IMI). The company’s rating falls to D from the previous week’s C. Intermolecular, Inc. is a semiconductor and clean energy technology platform company. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of IMI 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.