The grades of three tech services stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, Luxoft Holding, Inc. Class A (LXFT) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). In Portfolio Grader’s specific subcategories of Earnings Surprise, Equity, Cash Flow and Sales Growth, LXFT also gets A’s. 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 LXFT stock.

Total System Services, Inc. (TSS) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. Total System Services provides electronic payment processing, merchant services and related services to financial and non-financial institutions worldwide. For more information, get Portfolio Grader’s complete analysis of TSS stock.

Unisys Corporation (UIS) gets a higher grade this week, advancing from a C last week to a B. 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.