The overall ratings of 3 Semiconductors & Semiconductor Equipment stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Slipping from a C to a D rating, NXP Semiconductors NV (NXPI) takes a hit this week. 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.

Marvell Technology Group Ltd. (MRVL) experiences a ratings drop this week, going from last week’s C to a D. Marvell Technology Group Ltd. designs, develops, and markets integrated circuits for communications-related markets. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of MRVL stock.

Nova Measuring Instruments Ltd (NVMI) declines this week from a C to a D. 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.

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.