Wells Fargo & Co. has acquired a stake in Rock Creek Group LP to provide more hedge fund offerings to clients amid a push to double its asset management unit within seven years, Reuters reported. The lender purchased a 35 percent stake in the Washington, D.C.- based firm and has an option to make a controlling investment. Rock Creek manages about $7 billion in assets, giving clients access to handpicked hedge funds and emerging markets, Wells Fargo said in a release. Terms of the deal were not released.  Wells Fargo views hedge fund offerings as one of the fastest-growing segments in the asset management business.