As previously disclosed, on February 12, 2019, Prosperity Bancshares, Inc. announced that David Hollaway will retire from his positions as Chief Financial Officer of Prosperity Bancshares, Inc. (the “Company”) and Prosperity Bank (the “Bank”), effective April 1, 2019. On March 28, 2019, the Board of Directors of Prosperity Bancshares, Inc. appointed Asylbek Osmonov, currently the Prosperity Bank’s Chief Accounting Officer, to serve as Interim Chief Financial Officer, effective April 1, 2019. Mr. Osmonov will continue to serve as the Bank’s Chief Accounting Officer. Mr. Osmonov, 38, has been the Bank’s Chief Accounting Officer since September 2013. Prior to joining the Bank, Mr. Osmonov was an audit senior manager at Deloitte LLP, where he worked from 2004 to 2013. While at Deloitte, he focused on the financial services and oil and gas industries.