Tettamanti served as Chairman of the Board of Directors of Sterling Strategic Value Limited until 2012 and thereafter he served as Honorary Chairman. In January 2017 Sterling Strategic Value Limited was converted into a Luxembourg alternative investment fund and Tettamanti still serves as Honorary Chairman. He has furthermore been Chairman of the Board of Directors of several companies including ST Group Holding Inc., ST Real Estate Holding Inc., and ST Services Holding Inc. and he is currently honorary Chairman of ST Real Estate Holding Inc., ST Australia Real Estate Inc., and ST USA Real Estate Inc.
