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

DesCartes Systems Group (NASDAQ:DSGX) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. 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.

This is a strong week for AVG Technologies N.V. (NYSE:AVG). The company’s rating climbs to B from the previous week’s C. 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… Shares of AVG have increased 21% over the past month, better than the 2% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of AVG stock.

Activision Blizzard (NASDAQ:ATVI) improves from a C to a B rating this week. Activision publishes console, PC, online and handheld games. Wall Street seems to agree with the upgrade and has propelled the stock up 22% over the past month. For more information, get Portfolio Grader’s complete analysis of ATVI stock.

Ansys (NASDAQ:ANSS) gets a higher grade this week, advancing from a C last week 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. Wall Street has pushed the stock higher by 5.7% over the past month. 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.