This week, 4 Internet Software & Services stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, IAC/InterActiveCorp.’s (IAC) rating worsens to a F from the company’s D rating a week ago. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of IAC stock.

Akamai Technologies, Inc. (AKAM) slips from a D to a F this week. Akamai Technologies, Inc. provides services for accelerating and improving the delivery of content and applications over the Internet. For more information, get Portfolio Grader’s complete analysis of AKAM stock.

Twitter, Inc. (TWTR) experiences a ratings drop this week, going from last week’s D to a F. For more information, get Portfolio Grader’s complete analysis of TWTR stock.

Numerex Corp. Class A (NMRX) is having a tough week. The company’s rating falls from a C to a D. Numerex Corp. Class A develops and markets a variety of communication and information products and services. The company also gets F’s in sales growth, operating margin growth, earnings revisions, and return on equity. For more information, get Portfolio Grader’s complete analysis of NMRX 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.