In 2003, Gilinski acquired and subsequently merged Banco Sudameris and Banco Tequendama. This merger created GNB Sudameris, a bank with assets of over US $10 billion that ranks among the largest private Colombian banks as of 2018. The purchase of Servibanca, an ATM network with over 2,600 machines, and Suma Valores, a stock exchange commission agent company, has further expanded the network.