This week, five software stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

This week, Envivio, Inc. (ENVI) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Envivio provides software-based IP video processing and distribution solutions to mobile and broadband service providers, cable multiple system operators, and direct broadcast satellite service providers and content providers. In Portfolio Grader’s specific subcategories of Earnings Momentum, Earnings Revisions and Sales Growth, ENVI also gets A’s. For more information, get Portfolio Grader’s complete analysis of ENVI stock.

This is a strong week for Giant Interactive Group, Inc. Sponsored ADR (GA). The company’s rating climbs to A from the previous week’s B. Giant Interactive Group develops and operates online games in the People’s Republic of China. 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 GA stock.

Intuit’s (INTU) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Intuit develops and markets business and financial management software solutions for small and medium sized businesses, financial institutions, consumers, and accounting professionals. 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 INTU stock.

Perfect World Co., Ltd. Sponsored ADR Class B (PWRD) gets a higher grade this week, advancing from a B last week to an A. Perfect World develops and operates online games. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. For more information, get Portfolio Grader’s complete analysis of PWRD stock.

This week, Evolving Systems, Inc. (EVOL) pushes up from a C to a B rating. Evolving Systems is a software company providing business and operational support services and solutions to the telecommunications industry. For more information, get Portfolio Grader’s complete analysis of EVOL 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.