The grades of four Software stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

This week, Giant Interactive (NYSE:GA) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). Giant Interactive Group develops and operates online games in the People’s Republic of China. In Portfolio Grader’s specific subcategories of Equity and Cash Flow, GA also gets A’s. The stock price has risen 23.3% over the past month, better than the 3% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of GA stock.

Oracle (NASDAQ:ORCL) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Oracle supplies software for enterprise information management. Investors seem to agree with the upgraded status of the stock, and have pushed the stock up 6.5% over the past month. For more information, get Portfolio Grader’s complete analysis of ORCL stock.

This week, Interactive Intelligence Group (NASDAQ:ININ) pushes up from a C to a B rating. Interactive Intelligence provides software application suites for Voice over Internet Protocol business communications. Wall Street seems to agree with the upgrade and has propelled the stock up 6.9% over the past month. For more information, get Portfolio Grader’s complete analysis of ININ stock.

Ultimate Software Group (NASDAQ:ULTI) boosts its rating from a B to an A this week. Ultimate Software Group designs, develops, and markets unified HCM SaaS solutions for businesses. For more information, get Portfolio Grader’s complete analysis of ULTI 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.