Description of Registrants Securities

The following is a brief description of the rights of the authorized capital stock of Enterprise Financial Service Corp (the “Company”) and related provisions of our Certificate of Incorporation, as amended (the “Certificate of Incorporation”), our Amended and Restated Bylaws (the “Bylaws”) and applicable Delaware law. This description is qualified in its entirety by, and should be read in conjunction with, the Certificate of Incorporation and the Bylaws, which are filed as exhibits to this Annual Report on Form 10-K and are incorporated by reference herein, and Delaware General Corporation Law (the “DGCL”).

Under our Certificate of Incorporation, we are authorized to issue up to 45,000,000 shares of common stock, $0.01 par value (the “Common Stock”), and 5,000,000 shares of preferred stock, $0.01 par value (the “Preferred Stock”). There are no shares of Preferred Stock currently outstanding.

All of the issued and outstanding shares of Common Stock are fully paid and nonassessable.

The holders of our Common Stock are entitled to vote upon all matters submitted to a vote of our stockholders and are entitled to one vote for each share of Common Stock held. There is no cumulative voting.

Subject to the prior rights and preferences, if any, applicable to shares of Preferred Stock or any series of Preferred Stock, the holders of Common Stock are entitled to participate ratably in all dividends, payable in cash, stock or otherwise, that may be declared by our Board of Directors out of any funds legally available for the payment of dividends. Each such distribution will be payable to holders of record as they appear on our stock transfer books on such record dates and dividend dates as may be fixed by our board of directors.

If we voluntarily or involuntarily liquidate, dissolve or wind-up, or upon any distribution of our assets, the holders of our Common Stock will be entitled to receive, after distribution in full of the preferential amounts, if any, to be distributed to the holders of Preferred Stock or any series of Preferred Stock, all of the remaining assets available for distribution equally and ratably in proportion to the number of shares of Common Stock held by them.

Holders of our Common Stock do not have preemptive rights under the DGCL, or our Certificate of Incorporation or Bylaws. Shares of our Common Stock are not redeemable and have no subscription or conversion rights.

The Company may issue Preferred Stock from time to time upon the approval of the Board of Directors, without stockholder approval, with voting, conversion or other rights that could negatively affect the voting power and other rights of the holders of Common Stock. Preferred Stock could thus be issued quickly with terms calculated to delay or prevent a change in control of the Company or make it more difficult to remove our management. Additionally, the issuance of Preferred Stock may have the effect of decreasing the market price of the Common Stock. Preferred Stock will be fully paid and nonassessable upon issuance.

Upon our dissolution, liquidation or winding up, holders of Preferred Stock are entitled to receive from our assets an amount per share equal to the respective liquidation preference before any payment or distribution is made on our Common Stock or any other class of capital stock that ranks junior to the particular series of Preferred Stock. If our assets available for distribution upon our dissolution, liquidation or winding up are insufficient to pay in full the liquidation preference payable to holders of shares of all series of Preferred Stock, such assets will be distributed to such holders on a pro rata basis in proportion to the amounts payable on those shares.

If we issue shares of any series of Preferred Stock, holders of such shares will be entitled to one vote for each share held on matters on which holders of such series are entitled to vote with respect to such series or as expressly required by applicable law.

The affirmative vote or consent of the holders of a majority of the outstanding shares of each series of Preferred Stock, unless our Board of Directors establishes a higher amount, voting as a separate class, will be required for any amendment of our Certificate of Incorporation that adversely changes any rights or preferences of such series of Preferred Stock.

Our Certificate of Incorporation and Bylaws contain various protective provisions that would have the effect of impeding an attempt to change or remove our Board of Directors or to gain control of our outstanding capital stock.

Our Certificate of Incorporation and Bylaws provide:

Restrictions on Ownership

The Bank Holding Company Act requires any bank holding company, as defined in the Bank Holding Company Act, to obtain the approval of the Board of Governors of the Federal Reserve System (the “Federal Reserve Board”)

prior to the acquisition of 5% or more of our Common Stock. Any person, other than a bank holding company, is required to obtain prior approval of the Federal Reserve Board to acquire 10% or more of our Common Stock under the Change in Bank Control Act. Any holder of 25% or more of our Common Stock, or a holder of 5% or more if such holder otherwise exercises a controlling influence over us, is subject to regulation as a bank holding company under the Bank Holding Company Act.

Section 203 of the DGCL applies to the Company because it is listed on a national securities exchange. Pursuant to Section 203, with certain exceptions, a Delaware corporation may not engage in any of a broad range of business combinations, such as mergers, consolidations and sales of assets, with an “interested stockholder,” as defined below, for a period of three years from the date that person became an interested stockholder, unless:

Under Section 203, an “interested stockholder” is defined as any person, other than the corporation and any direct or indirect majority-owned subsidiary, that is:

The Company’s Common Stock is listed on the Nasdaq Global Select Market under the trading symbol “EFSC”.

The transfer agent and registrar for our Common Stock is Computershare N.A.