side pocket
n.— «Atticus angered some investors in March 2008 with how it treated its investment in Deutsche Börse. Atticus separated its roughly $1 billion stake in the exchange into what is known as a “side pocket,” which investors saw as limiting their ability to withdraw funds. Atticus executives were privy to confidential information, making it illegal for them to trade the stock, executives of the firm say.» —“Atticus Capital to Close Two Big Funds” by Gregory Zuckerman, Jenny Strasburg Wall Street Journal Aug. 12, 2009. (source: Double-Tongued Dictionary)