in the late 1990s credit suisse executed an aggressive acquisition strategy. the bank acquired bank leu, known as switzerland's oldest bank, in 1990. in 1993 credit suisse outbid ubs for a controlling stake in switzerland's fifth largest bank, swiss volksbank in a $1.1 billion deal. it also merged with winterthur group in 1997 for about $9 billion and acquired the asset management division of warburg, pincus & co. in 1999 for $650 million. donaldson, lufkin & jenrette was purchased for $11.5 billion in 2000.