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.

FSI International (FSII) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. 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.

NeoPhotonics Corporation (NPTN) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. NeoPhotonics designs, manufacturers, and markets standard and semi custom planar light wave circuits for metro access and other advanced optical communications platforms. For more information, get Portfolio Grader’s complete analysis of NPTN stock.

This is a strong week for TriQuint Semiconductor, Inc. (TQNT). The company’s rating climbs to A from the previous week’s B. TriQuint Semiconductor supplies communications companies with modules, components and foundry services. After two consecutive days of gains, the stock price has reached $13.53. For more information, get Portfolio Grader’s complete analysis of TQNT stock.

Skyworks Solutions, Inc. (SWKS) gets a higher grade this week, advancing from a C last week to a B. Skyworks Solutions is an innovator of analog and mixed-signal semiconductors. The stock price has risen 10.5% over the past month, better than the 1.3% decrease the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of SWKS stock.

AIXTRON SE Sponsored ADR (AIXG) improves from a C to a B rating this week. Aixtron provides deposition equipment, such as that used in lighting, fiber optic communication systems, and mobile telephone applications, to the semiconductor industry. Shares of the stock have been trading at an exceptionally rapid pace, up fourfold from the week prior. For more information, get Portfolio Grader’s complete analysis of AIXG stock.

JA Solar Holdings Co., Ltd. Sponsored ADR’s (JASO) ratings are looking better this week, moving up to a B from last 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. 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.