Technologies companies have entered into financial industries with "Gig Data × Artificial Intelligence (AI)" as their weapons, and they have disrupted the industries. Meanwhile, traditional financial institutions have taken on innovations in order to compete against the technologies companies. In this article, I analyze digital transformation strategies at Amazon, Alibaba, Softbank and LINE as examples of technologies companies, as well as those at DBS, Goldman Sachs, and ING as examples of existing financial institutions.