Victor Wang, the former chairman of Duke & Company, a defunct New York brokerage firm, shuttled yesterday between Manhattan and Brooklyn, pleading guilty to three crimes in two courts.

In New York Supreme Court yesterday morning, Mr. Wang pleaded guilty to charges of enterprise corruption brought by Robert M. Morgenthau, the Manhattan District Attorney. In the afternoon, he pleaded guilty to Federal charges of securities fraud and money laundering presented by Loretta E. Lynch, the United States Attorney for the Eastern District of New York.

Mr. Wang's guilty plea in state court is part of a 109-count indictment brought against Duke and its principals last May. He is the 11th defendant to plead guilty to felony charges in the case.

The indictment accused Duke, Mr. Wang and 17 other employees of the firm of defrauding investors by manipulating the prices of six stocks that had been underwritten by the firm. Assisting Duke in the manipulations, according to prosecutors, were two small brokerage firms, Bishop Allen Inc. and the First Cambridge Securities Corporation. Both are defunct.