The core business of the company is carried out through its subsidiaries and affiliated enterprises, and the banking business provides services such as deposits, loans, securities trading, securities investment, foreign exchange, futures trading and trust. The other part of the service is financial leasing service. The company's business also includes credit cards, business consulting, housing loans and debt management.

As of March 2009, the total assets of the Group reached 1 19 trillion yen. SMFG's business scope mainly focuses on financial services, including trust and securities, credit card services, financial leasing and customer financing. In addition, in May 2009, SMFG successfully acquired Nikko Securities, the third largest brokerage company in Japan under Citigroup, to further strengthen the securities retail brokerage business. SMFG and its wholly-owned subsidiaries have more than 48,000 employees worldwide, and have branches in many countries and regions in America, Europe, Oceania and Asia.