City Union Bank Limited (CUB) is an Indian private sector bank headquartered in Kumbakonam, Tamil Nadu. The bank was initially named Kumbakonam Bank Limited, and was incorporated on 31 October 1904. The bank preferred the role of a regional bank in the Thanjavur district of Tamil Nadu. In FY2016 the bank had a market capitalization of ₹140.5 billion (US$1.8 billion) and operated 700 branches, and 1762 ATMs.