This week, five internet and web service stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

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

This week, Autobytel (ABTL) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Autobytel is an automotive marketing services company that helps automotive retail dealers and automotive manufacturers market and sell new and used vehicles through its internet lead referral and online advertising programs. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of ABTL stock.

OpenTable, Inc. (OPEN) boosts its rating from a C to a B this week. OpenTable provides free, real-time online restaurant reservations for diners through an online booking service. For more information, get Portfolio Grader’s complete analysis of OPEN 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’s (BITA) ratings are up from a B last week to an A. 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.