The grades of four internet and web service 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.

Commtouch Software Ltd (CTCH) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. In Portfolio Grader’s specific subcategory of Sales Growth, CTCH also gets an A. Commtouch Software provides messaging, antivirus, and Web security solutions to OEM customers, enterprises, and service providers primarily in Israel, North America, Europe, and Asia. For more information, get Portfolio Grader’s complete analysis of CTCH stock.

Google Inc. Class C (GOOG) gets a higher grade this week, advancing from a C last week to a B. Google is a global technology company that provides web-based search and advertising services. For more information, get Portfolio Grader’s complete analysis of GOOG stock.

Internap Corporation (INAP) shows solid improvement this week. The company’s rating rises from a C to a B. Internap Network Services provides a broad range of scalable information technology infrastructure services for enterprises. For more information, get Portfolio Grader’s complete analysis of INAP stock.

This week, Bitauto Holdings Ltd. Sponsored ADR (BITA) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Bitauto provides Internet content and marketing services for the automotive industry, primarily in the People’’s Republic of China. For more information, get Portfolio Grader’s complete analysis of BITA 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.