The grades of six semiconductor stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

This week, FSI International (FSII) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). 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.

This week, NeoPhotonics Corporation (NPTN) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). NeoPhotonics designs, manufacturers, and markets standard and semi custom planar light wave circuits for metro access and other advanced optical communications platforms. Shares of NPTN have increased 24.4% over the past month, better than the 1.7% decrease the S&P 500 has seen over the same period of time. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of NPTN stock.

TriQuint Semiconductor, Inc. (TQNT) gets a higher grade this week, advancing from a B last week to an A. TriQuint Semiconductor supplies communications companies with modules, components and foundry services. For more information, get Portfolio Grader’s complete analysis of TQNT stock.

Skyworks Solutions, Inc. (SWKS) improves from a C to a B rating this week. Skyworks Solutions is an innovator of analog and mixed-signal semiconductors. Wall Street seems to agree with the upgrade and has propelled the stock up 17.7% over the past month. For more information, get Portfolio Grader’s complete analysis of SWKS stock.

This week, AIXTRON SE Sponsored ADR’s (AIXG) ratings are up from a C last week to a B. Aixtron provides deposition equipment, such as that used in lighting, fiber optic communication systems, and mobile telephone applications, to the semiconductor industry. For more information, get Portfolio Grader’s complete analysis of AIXG stock.

This is a strong week for JA Solar Holdings Co., Ltd. Sponsored ADR (JASO). The company’s rating climbs to B from the previous week’s C. JA Solar Holdings is engaged in the design, manufacture, and marketing of high-performance solar cells, which are made from specially processed silicon wafers. Wall Street has pushed the stock higher by 10% over the past month. For more information, get Portfolio Grader’s complete analysis of JASO 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.