This week, four Software stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

DesCartes Systems Group (NASDAQ:DSGX) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Descartes Systems Group is a global provider of federated network and global logistics technology solutions that help its customers make and receive shipments and manage related resources. In Portfolio Grader’s specific subcategory of Earnings Momentum, DSGX also gets an A. For more information, get Portfolio Grader’s complete analysis of DSGX stock.

AVG Technologies N.V. (NYSE:AVG) improves from a C to a B rating this week. AVG Technologies NV provides software and online services and solutions. It designs antivirus and Internet security products. Its product portfolio targets the consumer and small business markets and includes Internet security, PC performance optimization, online backup, mobile security, identity pr… For more information, get Portfolio Grader’s complete analysis of AVG stock.

Activision Blizzard (NASDAQ:ATVI) boosts its rating from a C to a B this week. Activision publishes console, PC, online and handheld games. For more information, get Portfolio Grader’s complete analysis of ATVI stock.

Ansys (NASDAQ:ANSS) shows solid improvement this week. The company’s rating rises from a C to a B. Ansys develops and markets engineering simulation software and technologies used by engineers and designers working in fields such as aerospace, electronics, biomedical, energy, and defense. For more information, get Portfolio Grader’s complete analysis of ANSS 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.