X0508 4 2026-03-04 0001025835 ENTERPRISE FINANCIAL SERVICES CORP EFSC 0001731826 IANNACONE NICOLE M 150 N. MERAMEC CLAYTON MO 63105 1 SEVP, Chief Legal Officer 0 Common Stock 22855 D Non Qualified Stock Option (Right to Buy) 43.81 2024-02-06 2031-02-25 Common Stock 4521 4521 D Non Qualified Stock Option (Right to Buy) 48.34 2025-02-03 2032-02-24 Common Stock 4946 4946 D Non Qualified Stock Option (Right to Buy) 54.46 2026-02-10 2033-02-28 Common Stock 4985 4985 D Non Qualified Stock Option (Right to Buy) 39.50 2034-02-28 Common Stock 7551 7551 D Non Qualified Stock Option (Right to Buy) 57.17 2035-03-04 Common Stock 3976 3976 D Restricted Share Units Common Stock 1443 1443 D Restricted Share Units Common Stock 1330 1330 D Restricted Share Units Common Stock 3326 3326 D Restricted Share Units 2026-03-04 4 A 0 1471 0 A Common Stock 1471 1471 D This option becomes exercisable in the first quarter of 2027, subject to continued employment by the reporting person. The option becomes exercisable in the first quarter of 2028, subject to continued employment by the reporting person. The RSU's were granted pursuant to the Company's 2018 Stock Incentive Plan. Each RSU represents the right to receive one share of Common Stock, subject to adjustment as provided in the Grant Agreement. The RSU's vest 100% in the first quarter of 2027, subject to continued employment by the reporting person. The RSU's vest 100% in the first quarter of 2028, subject to continued employment by the reporting person. The RSUs vest over six years in one-third installments on each of February 24, 2024, February 24, 2026, and February 24, 2028. Vesting is subject to continued employment of the reporting person. On each vesting date, for each RSU vesting on such date, the reporting person will receive one share of Common Stock. The RSU's vest 100% in the first quarter of 2029, subject to continued employment by the reporting person. /s/ Nicole M. Iannacone 2026-03-06