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”).

iGATE Computer Systems Ltd ADR (NYSE:PTI) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Patni Computer Systems develops software and provides information technology services and business solutions. In Portfolio Grader’s specific subcategory of Cash Flow, PTI also gets an A. For more information, get Portfolio Grader’s complete analysis of PTI stock.

Heartland Payment Systems (NYSE:HPY) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. Heartland Payment Systems provides bank card-based payment processing services to small-and medium-sized merchants in the United States. For more information, get Portfolio Grader’s complete analysis of HPY stock.

Computer Task Group (NASDAQ:CTGX) gets a higher grade this week, advancing from a C last week to a B. Computer Task Group is an information technology solutions and staffing company with operations in North America and Europe. For more information, get Portfolio Grader’s complete analysis of CTGX 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.