This week, six semiconductor stocks are improving their overall rating on Portfolio Grader. Each of these rates 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.

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.

AIXTRON SE Sponsored ADR (AIXG) boosts its rating from a C to a B this week. 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.

JA Solar Holdings Co., Ltd. Sponsored ADR (JASO) gets a higher grade this week, advancing from a C last week to a B. 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.

This week, Skyworks Solutions, Inc.’s (SWKS) ratings are up from a C last week to a B. Skyworks Solutions is an innovator of analog and mixed-signal semiconductors. For more information, get Portfolio Grader’s complete analysis of SWKS stock.

The rating of TriQuint Semiconductor, Inc. (TQNT) moves up this week, rising from a B 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.

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.