This week, 3 Internet Software & Services 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, Baidu, Inc. Sponsored ADR Class A’s (BIDU) ratings are up from a C last week to a B. Baidu, Inc. Sponsored ADR Class A is a Chinese-language Internet search provider. The company also gets A’s in operating margin growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of BIDU stock.

MercadoLibre, Inc. (MELI) is seeing ratings go up from a B last week to a A this week. MercadoLibre, Inc. operates an online trading site for the Latin American markets. The company also gets A’s in sales growth, operating margin growth, earnings revisions, earnings surprise, and return on equity. For more information, get Portfolio Grader’s complete analysis of MELI stock.

Yahoo! Inc. (YHOO) shows solid improvement this week. The company’s rating rises from a C to a B. Yahoo! Inc. is a digital media company that delivers personalized digital content and experiences across devices worldwide. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of YHOO 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.