The ratings of 4 Semiconductors & Semiconductor Equipment stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Slipping from a C to a D rating, Tower Semiconductor Ltd (TSEM) takes a hit this week. Tower Semiconductor Ltd an independent semiconductor foundry, manufactures analog intensive mixed-signal semiconductor devices in the United States, India, the Asia Pacific, Europe, and Israel. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of TSEM stock.

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

Ultra Clean Holdings, Inc. (UCTT) declines this week from a C to a D. Ultra Clean Holdings, Inc. is a developer and supplier of critical subsystems, mainly for the semiconductor capital equipment industry. The company also gets F’s in operating margin growth, earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of UCTT stock.

Intermolecular, Inc.’s (IMI) rating weakens this week, dropping to a D versus last 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.