The grades of four 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”).

Mattson Technology, Inc.’s (NASDAQ:MTSN) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Mattson Technology designs, manufactures, and markets advanced fabrication equipment. In Portfolio Grader’s specific subcategory of Earnings Revisions, MTSN also gets an A. For more information, get Portfolio Grader’s complete analysis of MTSN stock.

FSI International (NASDAQ:FSII) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this week. FSI International is a supplier of processing equipment used at key production steps to manufacture microelectronics, including semiconductor devices and thin film heads. For more information, get Portfolio Grader’s complete analysis of FSII stock.

This is a strong week for Taiwan Semiconductor Manufacturing Co., Ltd. Sponsored ADR (NYSE:TSM). The company’s rating climbs to A from the previous week’s B. Taiwan Semiconductor Manufacturing makes semiconductors based on its own or third-party proprietary integrated circuit designs. Shares of TSM have increased 6% over the past month, better than the 1.7% decrease the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of TSM stock.

This week, Himax Technologies, Inc. Sponsored ADR’s (NASDAQ:HIMX) ratings are up from a B last week to an A. Himax Technologies designs and manufactures integrated circuits. Investors seem to agree with the upgraded status of the stock, and have pushed the stock up 20.2% over the past month. For more information, get Portfolio Grader’s complete analysis of HIMX 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.