Three Internet & 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”).

Yahoo! (NASDAQ:YHOO) is showing solid improvement this week. The company’s rating rises from a C (“hold”) to a B (“buy”). Yahoo is a digital media company that delivers personalized digital content and experiences across devices worldwide. In Portfolio Grader’s specific subcategories of Earnings Revisions and Earnings Surprise, YHOO also gets A’s. For more information, get Portfolio Grader’s complete analysis of YHOO stock.

Demand Media (NYSE:DMD) improves from a C to a B rating this week. Demand Media operates as a content and social media company in the United States that identifies, creates, distributes, and monetizes content. For more information, get Portfolio Grader’s complete analysis of DMD stock.

Market Leader (NASDAQ:LEDR) jumps from a B (“buy”) to an A (“strong buy”) this week. Market leader offers Internet-based marketing services for real estate professionals. The stock price has increased 7% in the past month, outpacing the Nasdaq’s growth rate from the same period of 1.2%. For more information, get Portfolio Grader’s complete analysis of LEDR 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.