<p>The IBM headquarters in Armonk, N.Y., in a 2009 file photo. (Stan Honda/AFP/Getty Images)</p><p>U.S. authorities on Wednesday announced charges against a research analyst for trading and tipping others before a 2009 acquisition by computer giant IBM, expanding a related insider trading case filed last month.</p><p>Federal prosecutors charged Trent Martin, who worked at a Connecticut brokerage, for purchasing shares of SPSS before IBM agreed to the $1.2 billion deal. He was also charged with passing the information to others, including his roommate.</p><p>On Nov. 29 the Justice Department and the Securities and Exchange Commission charged two former stockbrokers, including Martin's roommate, for their roles in the alleged insider trading scheme.</p><p><a href="http://articles.chicagotribune.com/2012-12-26/business/chi-research-analyst-charged-in-widening-ibm-insider-trading-case-20121226_1_acquisition-by-computer-giant-ibm-insider-research-analyst">Keep reading...</a></p><p>Read also:</p><p><a href="http://online.wsj.com/article/SB10001424127887323530404578203713005385862.html?mod=googlenews_wsj">Analyst Named in IBM-SPSS Insider Case</a> (Wall Street Journal)</p><p><a href="http://www.businessweek.com/news/2012-12-26/analyst-indicted-on-insider-trading-charges-tied-to-ibm">Analyst Indicted on Insider-Trading Charges Tied to IBM</a> (Businessweek)</p><p><a href="http://www.foxbusiness.com/government/2012/12/26/insider-trading-charges-filed-against-analyst/">Analyst Charged in IBM Insider Trading Case</a> (Fox Business)</p><p>Explore: <a href="http://news.google.com/news/more?ncl=dLXlttG0vXb9w3MIgYDWLFAiFYYyM&ned=us">83 additional articles.</a></p>