The ratings of 3 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”).

QUALCOMM Incorporated (QCOM) gets weaker ratings this week as last week’s C drops to a D. QUALCOMM Incorporated manufactures digital wireless communications equipment. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of QCOM stock.

Micron Technology, Inc. (MU) is having a tough week. The company’s rating falls from a D to a F. Micron Technology, Inc. manufactures and markets Dram and Nand Flash memory, image sensors and other semiconductor components. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of MU stock.

This week, CVD Equipment Corporation’s (CVV) rating worsens to a D from the company’s C rating a week ago. CVD Equipment Corporation develops, manufactures, and markets chemical vapor deposition equipment, annealing furnaces, and etching systems. The company also gets F’s in sales growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of CVV 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.