Dresdner withdraws as primary dealer for Fed NEW YORK (MarketWatch) -- Dresdner Kleinwort Securities has withdrawn from the Federal Reserve's primary U.S. government security dealers, the U.S. central bank said Friday. The change, effective after business closes, brings the number of dealers back down to 16, after Jefferies & Co. joined last week. Dealers trade directly with the Fed and are required to bid at Treasury auctions. The last firm to drop out was Nomura Securities International, a division of Nomura , in late 2007.