Four Internet and Web Service stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

This week, VeriSign (NASDAQ:VRSN) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). VeriSign provides Internet infrastructure services for the networked world. In Portfolio Grader’s specific subcategories of Earnings Revisions and Margin Growth, VRSN also gets A’s. Shares of VRSN have increased 15.6% over the past month, better than the 1.9% increase the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of VRSN stock.

SciQuest’s (NASDAQ:SQI) ratings are looking better this week, moving up to a B from last week’s C. SciQuest provides software-as-a-service procurement automation and supplier enablement solutions. For more information, get Portfolio Grader’s complete analysis of SQI stock.

This week, Internet Initiative Japan (NASDAQ:IIJI) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). Internet Initiative Japan develops and operates Internet access services and other Internet-related services in Japan. Wall Street has pushed the stock higher by 20.8% over the past month. For more information, get Portfolio Grader’s complete analysis of IIJI stock.

This week, CoStar Group (NASDAQ:CSGP) pushes up from a B to an A rating. CoStar Group provides information and analytic services to the commercial real estate industry in the United States, the United Kingdom, and France. Investors have pushed the stock price up 7.4% over the past month. For more information, get Portfolio Grader’s complete analysis of CSGP 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.