This week, four 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”).

MoneyGram International, Inc. (MGI) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. MoneyGram International provides payment services to consumers and businesses through a network of agents and its financial institution customers. In Portfolio Grader’s specific subcategory of Earnings Momentum, MGI also gets an A. For more information, get Portfolio Grader’s complete analysis of MGI stock.

Datalink Corporation (DTLK) boosts its rating from a C to a B this week. Datalink analyzes, designs, implements, and supports information storage infrastructure that store, protect, and provide continuous access to information. Shares of DTLK have increased 37.4% over the past month, better than the 1.3% decrease the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of DTLK stock.

This week, Acxiom Corporation (ACXM) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). Acxiom is a provider of marketing technology and services that allow marketers to manage audiences, personalize consumer experiences, and create profitable customer relationships. For more information, get Portfolio Grader’s complete analysis of ACXM stock.

The rating of Computer Sciences Corporation (CSC) moves up this week, rising from a C to a B. Computer Sciences offers services to clients in the commercial and government markets. For more information, get Portfolio Grader’s complete analysis of CSC 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.