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

This week, FSI International (FSII) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. FSI International is a supplier of processing equipment used at key production steps to manufacture microelectronics, including semiconductor devices and thin film heads. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum and Sales Growth, FSII also gets A’s. For more information, get Portfolio Grader’s complete analysis of FSII stock.

China Sunergy Co., Ltd. Sponsored ADR (CSUN) earns an A this week, jumping up from last week’s grade of B. China Sunergy designs, develops, manufactures and sells solar cells. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. For more information, get Portfolio Grader’s complete analysis of CSUN stock.

Marvell Technology (MRVL) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Marvell Technology designs, develops, and markets integrated circuits for communications-related markets. Shares of the stock have been changing hands at an unusually rapid pace, three times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of MRVL 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.