Exhibit 99.1 FOR IMMEDIATE RELEASE Oklahoma City, OK 73102 On November 17, 2025, the Company acquired American Bank of Oklahoma ("ABOK"), for aggregate consideration totaling $33 million. ABOK is a community bank headquartered in Collinsville, Oklahoma with six banking locations in Oklahoma. Upon acquisition, ABOK had approximately$413 million in total assets, $244 million in loans and$341 million in deposits. ABOK will continue to operate under its present name until it is merged into BancFirst, which is ...