Citigroup's chief financial officer John Gerspach will retire next year, ending a nearly 10-year run as the bank’s top finance executive.

Gerspach, 65 years old, will end his tenure as the bank’s CFO on March 1, 2019, according to an email chief executive Michael Corbat sent to employees that was viewed by The Wall Street Journal. Gerspach has served as Citi’s CFO since July 2009, making him the longest-serving finance chief currently at any major US bank.