State Bank of India (SBI) is an Indian multinational, public sector banking and financial services company. It is a government-owned corporation with its headquarters in Mumbai, Maharashtra. On 1st April, 2017, State Bank of India, which is India's largest Bank merged with five of its Associate Banks (State Bank of Bikaner & Jaipur, State Bank of Hyderabad, State Bank of Mysore, State Bank of Patiala and State Bank of Travancore) and Bharatiya Mahila Bank with itself. This is the first ever large scale consolidation in the Indian Banking Industry. With the merger, State Bank of India will enter the league of top 50 global banks with a balance sheet size of ₹33 trillion, 278,000 employees, 420 million customers, and more than 24,000 branches and 59,000 ATMs. SBI's market share will increase to 22 percent from 17 per cent. It has 198 offices in 37 countries; 301 correspondents in 72 countries. The company is ranked 232nd on the Fortune Global 500 list of the world's biggest corporations as of 2016. The bank traces its ancestry to British India, through the Imperial Bank of India, to the founding, in 1806, of the Bank of Calcutta, making it the oldest commercial bank in the Indian subcontinent. Bank of Madras merged into the other two "presidency banks" in British India, Bank of Calcutta and Bank of Bombay, to form the Imperial Bank of India, which in turn became the State Bank of India in 1955.[8] Government of India owned the Imperial Bank of India in 1955, with Reserve Bank of India (India's Central Bank) taking a 60% stake, and renamed it the State Bank of India. In 2008, the government took over the stake held by the Reserve Bank of India.