X0609 4 2026-06-30 0001025835 ENTERPRISE FINANCIAL SERVICES CORP EFSC 0001283697 DUMLAO TROY false 150 N. MERAMEC ST LOUIS MO 63105 1 EVP, Chief Accounting Officer 0 Common Stock 2026-06-30 5 J 0 E 462 45.94 A 8935 D Depository Shares 400 D Non Qualified Stock Option (Right to Buy) 43.81 2024-02-06 2031-02-25 Common Stock 1058 1058 D Non Qualified Stock Option (Right to Buy) 48.34 2025-02-03 2032-02-24 Common Stock 1266 1266 D Non Qualified Stock Option (Right to Buy) 54.46 2026-02-10 2033-02-28 Common Stock 1769 1769 D Non Qualified Stock Option (Right to Buy) 39.50 2034-02-28 Common Stock 2722 2722 D Non Qualified Stock Option (Right to Buy) 57.17 2035-03-04 Common Stock 1919 1919 D Restricted Share Units Common Stock 520 520 D Restricted Share Units Common Stock 642 642 D Restricted Share Units Common Stock 836 836 D The reporting person is voluntarily reporting the acquisition of shares of the Issuer's common stock pursuant to the Issuer's 2018 Employee Stock Purchase Plan ("ESPP") for the ESPP purchase period of January 1, 2026, through June 30, 2026. This transaction is exempt under Section 16b-3(c). In accordance with the terms of the ESPP, the reported shares were acquired based on 85% of the closing price of the Issuer's common stock on January 2, 2026. Each Depositary Share represents a 1/40th interest in a share of the Issuer's 5.00% Series A Fixed-Rate Non-Cumulative Perpetual Preferred Stock. Depositary Shares were purchased in an underwritten public offering. 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 RSU's vest 100% in the first quarter of 2029, subject to continued employment by the reporting person. /s/ Troy Dumlao 2026-07-08