This week, seven 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 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.

NeoPhotonics Corporation’s (NPTN) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). NeoPhotonics designs, manufacturers, and markets standard and semi custom planar light wave circuits for metro access and other advanced optical communications platforms. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of NPTN stock.

This week, Xcerra Corporation (XCRA) pushes up from a C to a B rating. For more information, get Portfolio Grader’s complete analysis of XCRA stock.

AIXTRON SE Sponsored ADR (AIXG) shows solid improvement this week. The company’s rating rises from a C 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. For more information, get Portfolio Grader’s complete analysis of JASO 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. For more information, get Portfolio Grader’s complete analysis of SWKS stock.

TriQuint Semiconductor, Inc. (TQNT) is seeing ratings go up from a B last week to an A this week. 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.