X0306 4 2020-05-29 0001025835 ENTERPRISE FINANCIAL SERVICES CORP EFSC 0001482570 KEENE S TURNER 150 N. MERAMEC CLAYTON MO 63105 1 EVP, Chief Financial Officer Common Stock 2020-05-29 5 J 0 E 558 24.96 A 29708 D Common Stock 1419 I 401(k) Plan Restricted Share Units Common Stock 610 610 D Restricted Share Units Common Stock 670 670 D Restricted Share Units Common Stock 940 940 D Restricted Share Units Common Stock 1157 1157 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, 2019 through May 31, 2020. 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 May 29, 2020. The reporting person holds units in the stock fund and the number of shares reported as indirectly held in the 401 (k) plan in this row is an estimate of the number of shares of the issuer's Common Stock held in the unitized stock fund and allocated to the reporting person's account. 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 2021, subject to continued employment by the reporting person. The RSU's vest 100% in the first quarter of 2022, subject to continued employment by the reporting person. The RSU's vest 100% in the first quarter of 2023, subject to continued employment by the reporting person. The RSU's vest 50% on the first anniversary of the closing date of the merger with Trinity Capital Corporation and 50% on the second anniversary of the closing of the merger with Trinity Capital Corporation, subject to continued employment of the reporting person and other terms of the award agreement. On the vesting date, the reporting person will receive one share of Common Stock for each RSU. /s/ Keene S. Turner 2020-06-04