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

This week, Qiwi Plc Sponsored ADR Class B (QIWI) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Surprise and Equity, QIWI also gets A’s. For more information, get Portfolio Grader’s complete analysis of QIWI stock.

This week, Total System Services, Inc. (TSS) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). Total System Services provides electronic payment processing, merchant services and related services to financial and non-financial institutions worldwide. Shares of the stock have been changing hands at an unusually rapid pace, three times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of TSS stock.

Unisys Corporation (UIS) earns a B this week, jumping up from last week’s grade of C. Unisys is an information technology company that provides outsourcing services, systems integration, consulting services and infrastructure services for its customers. For more information, get Portfolio Grader’s complete analysis of UIS 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.