 SAN FRANCISCO--BUSINESS WIRE--Wells Fargo Company NYSE: WFC announced today it has entered into an agreement to sell its private student loan portfolio to investors, with Firstmark, a division of Nelnet NYSE: NNI, assuming responsibility for servicing the portfolio upon the sale. Wells Fargo notified customers in September of its intention to exit the private student loan business. The company will continue to accept new student loan applications from existing private student loan c 