BANCFIRST CORP /OK/ — Form 10-Q

BancFirst Corporation amended its Thrift Plan effective February 13, 2026, to merge the American Bank of Oklahoma 401(k) Profit Sharing Plan (merger date June 5, 2026). The amendment adds service credit provisions for American Bank of Oklahoma employees hired as of February 12, 2026, establishes eligibility effective February 13, 2026, implements a five-year graded vesting schedule for employer contributions, and permits distributions upon age 59½ or disability. This reflects BancFirst's acquisition of American Bank of Oklahoma, though specific acquisition dollar amount and employee count are not disclosed in this exhibit.