This week, four Internet and Web Service stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, j2 Global (NASDAQ:JCOM) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). J2 Global Communications provides outsourced messaging and communications services to individuals and businesses throughout the world. In Portfolio Grader’s specific subcategories of Equity and Cash Flow, JCOM also gets A’s. For more information, get Portfolio Grader’s complete analysis of JCOM stock.

Yahoo! (NASDAQ:YHOO) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Yahoo is a digital media company that delivers personalized digital content and experiences across devices worldwide. The stock price has risen 5.5% over the past month, better than the 4.2% increase the Nasdaq has seen over the same period of time. The stock currently has a trailing PE Ratio of 6.00. For more information, get Portfolio Grader’s complete analysis of YHOO stock.

This is a strong week for Support.com (NASDAQ:SPRT). The company’s rating climbs to A from the previous week’s B. Supportsoft provides software and services in both consumer and enterprise segments. For more information, get Portfolio Grader’s complete analysis of SPRT stock.

LinkedIn’s (NYSE:LNKD) ratings are looking better this week, moving up to a A from last week’s B. LinkedIn operates a social networking website used for professional networking. Investors seem to agree with the upgraded status of the stock, and have pushed the stock up 6.7% over the past month. For more information, get Portfolio Grader’s complete analysis of LNKD 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.