David Einhorn has filed a lawsuit seeking to unmask the identity of an anonymous financial blogger who, he says, disclosed that Mr. Einhorn’s hedge fund was buying shares in a technology company. The legal maneuver illustrates the tension between a money manager’s ability to safeguard his trading strategies and the rights of others to report on them. The lawsuit, filed on Friday in New York State Supreme Court by Mr. Einhorn’s Greenlight Capital hedge fund, seeks to force the popular investment website Seeking Alpha to disclose the identity of the anonymous blogger known as Valuable Insights. On Tuesday, Judge Carol ... (full story)