Warburg Dillon Read, the investment banking arm of Union Bank of Switzerland AG, said its vice chairman, Herman van der Wyck, will retire at the end of March.

Mr. Van der Wyck, 65, was previously vice chairman of S.G. Warburg Group PLC, the United Kingdom investment bank that was bought by Swiss Bank Corp. in 1995. Ken Costa will remain as vice chairman of the investment bank.

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