This week, three tech services stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Gartner, Inc. (IT) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. Gartner provides research and analysis on the computer hardware, software, communications, and related information technology industries. In Portfolio Grader’s specific subcategory of Equity, IT also gets an A. Shares of the stock have been changing hands at an unusually rapid pace, up 813.4% from the week prior. For more information, get Portfolio Grader’s complete analysis of IT stock.

Western Union Company (WU) gets a higher grade this week, advancing from a C last week to a B. Western Union is engaged in global money transfer and payment services. Shares of the stock have been trading at an exceptionally rapid pace, up fourfold from the week prior. For more information, get Portfolio Grader’s complete analysis of WU stock.

Convergys Corporation (CVG) improves from a C to a B rating this week. Convergys provides customer management business process outsourcing solutions for communications, financial services, technology, and other vertical markets in North America and internationally. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. For more information, get Portfolio Grader’s complete analysis of CVG 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.