Updated from 3:46 p.m. EDT Citigroup ( C) revealed Friday that Bernie Ebbers made an $11 million windfall on IPO shares he got from Citi's investment banking unit and its predecessors. The information came as Citi and Congress locked horns in the latest round of a long-running subpoena war. On Friday, the House Financial Services Committee served its latest subpoena on Citigroup, seeking additional information about how Salomon Smith Barney doled out shares in hot initial public offerings to telecom executives it did business with. Those execs included Ebbers, the former chief of failed telco giant WorldCom and the center of a broadening scandal on Wall Street regarding executive compensation and bubble-era business practices. Citigroup's records notably show that Ebbers took in the lion's share of his IPO gains before the company acquired the unit in its 1999 merger with Travelers.