The grades of 3 Semiconductors & Semiconductor Equipment stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

The rating of Exar Corporation (EXAR) moves up this week, rising from a B to a A. Exar Corporation designs, develops, and markets analog and mixed-signal integrated circuits for use in communications and video and imaging products. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of EXAR stock.

This week, Ultra Clean Holdings, Inc. (UCTT) pushes up from a B to a A rating. Ultra Clean Holdings, Inc. is a developer and supplier of critical subsystems, mainly for the semiconductor capital equipment industry. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of UCTT stock.

Aehr Test Systems’ (AEHR) ratings are looking better this week, moving up to a B from last week’s C. Aehr Test Systems manufactures and sells systems, which are designed to reduce the cost of testing flash, dynamic random access memory, and other memory devices, and to perform reliability screening or burn-in of complex logic and memory devices. For more information, get Portfolio Grader’s complete analysis of AEHR 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.