On the 20th of October 2011, Sonatra Microfinance was officialy opened. The opening ceremony was presided over by Lok Chumteav Ouk Maly, Deputy Governor of Cambodia Nation Bank. Also during this ceremony, Oknha Sorn Sokna has signed an MOU with Japanese partners, Mr. Suzumu Hayashi, Chairman of Grand Corporation, Japan and Mr. Tetsuji Nagata, General Director of East Wing Group, Singapore in that both partners will bring the resouce of fund around US $ 50 million to Sonatra Microfinance.