X0306 4 2018-05-01 0001025835 ENTERPRISE FINANCIAL SERVICES CORP EFSC 0001674404 LALLY JAMES BRIAN 150 N. MERAMEC CLAYTON MO 63105 1 CEO Common Stock 2018-05-01 4 M 0 5188 0 A 40998 D Common Stock 2018-05-01 4 F 0 3500 50.85 D 37498 D Common Stock 12012 I 401 (K) Plan Common Stock 9270 D Stock Settled Stock Appreciation Rights 20.63 2018-05-01 4 M 0 5188 0 D 2008-12-15 2018-06-13 Common Stock 5188 0 D Stock Settled Stock Appreciation Rights 10.14 2011-08-02 2020-08-02 Common Stock 15000 15000 D Withholding of stock to satisfy exercise price and tax withholding obligation in connection with the exercise of stock settled appreciation rights. 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. These shares are held jointly with spouse. Each SSAR consists of the right to receive an amount, in common stock, equal to the excess of the fair market value of a share of common stock on the date of exercise over the exercise price of the SSAR. The SSARs vest at a rate of 20% annually over five years, subject to continued employment of the reporting person. Vesting occurs on December 15 of each year, commencing December 15, 2008. Each SSAR consists of the right to receive an amount, in common stock, equal to the excess of the fair market value of a share of common stock on the date of exercise over the exercise price of the SSAR. The SSARs vest at a rate of 20% annually over five years, subject to continued employment of the reporting person. Vesting occurs on August 2, of each year, commencing August 2, 2011. /s/James Brian Lally 2018-05-03