X0306 4 2021-05-31 0001025835 ENTERPRISE FINANCIAL SERVICES CORP EFSC 0001283697 DUMLAO TROY 150 N. MERAMEC ST LOUIS MO 63105 1 SVP, Chief Accounting Officer Common Stock 2021-05-31 5 J 0 E 568 29.32 A 2520 D Non Qualified Stock Option (Right to Buy) 43.81 2031-02-25 Common Stock 1058 1058 D Restricted Share Units Common Stock 366 366 D Restricted Share Units Common Stock 737 737 D Restricted Share Units Common Stock 989 989 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 December 1, 2020 through May 31, 2021. 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 December 1, 2020. The Options vest at a rate of 33% annually over three years, subject to continued employment of the reporting person. Vesting occurs on the anniversary date of the grant each year, with final vest occurring on February 25, 2024 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 RSUs vest at a rate of 33% annually over three years, subject to continued employment of the reporting person. Vesting occurs on the anniversary date of the grant each year, with final vest occurring on April 1, 2022. On each vesting date, for each RSU vesting on such date, the reporting person will receive one share of Common Stock. The RSUs vest at a rate of 33% annually over three years, subject to continued employment of the reporting person. Vesting occurs on the anniversary date of the grant each year, with final vest occurring on February 26, 2023. On each vesting date, for each RSU vesting on such date, the reporting person will receive one share of Common Stock. The RSUs vest at a rate of 33% annually over three years, subject to continued employment of the reporting person. Vesting occurs on the anniversary date of the grant each year, with final vest occurring on February 25, 2024. On each vesting date, for each RSU vesting on such date, the reporting person will receive one share of Common Stock. /s/ Troy Dumlao 2021-06-04