NEW YORK (AP) — A former Goldman Sachs board member fed secrets about the banking giant to a close friend and fellow Wall Street heavyweight who used the information to make a killing on the stock market, a prosecutor said Wednesday in closing arguments at the board member’s insider trading trial.

Rajat Gupta “abused his position as a corporate insider,” Assistant U.S. Attorney Richard Tarlowe said in federal court in Manhattan. “Gupta violated his duty to keep that information confidential by giving that information to Raj Rajaratnam,” the disgraced founder of the $7 billion Galleon hedge fund.