ENTERPRISE FINANCIAL SERVICES CORP

Exhibit No. Description

3.1 Certificate of Incorporation of Registrant, (incorporated herein by reference to Exhibit 3.1 of Registrant's Registration Statement on Form S-1 filed on December 16, 1996 (File No. 333-14737)).

3.2 Amendment to the Certificate of Incorporation of Registrant (incorporated herein by reference to Exhibit 4.2 to Registrant's Registration Statement on Form S-8 filed on July 1, 1999 (File No. 333-82087)).

3.3 Amendment to the Certificate of Incorporation of Registrant (incorporated herein by reference to Exhibit 3.1 to Registrant's Quarterly Report on Form 10-Q for the period ended September 30, 1999 filed on November 12, 1999 (File No. 001-15373)).

3.4 Amendment to the Certificate of Incorporation of Registrant (incorporated herein by reference to Exhibit 99.2 to Registrant's Current Report on Form 8-K filed on April 30, 2002 (File No. 001-15373)).

3.5 Amendment to the Certificate of Incorporation of Registrant (incorporated herein by reference to Appendix A to Registrant's Definitive Proxy Statement on Schedule 14A filed on November 20, 2008 (File No. 001-15373)).

3.6 Amendment to the Certificate of Incorporation of Registrant (incorporated herein by reference to Exhibit 3.1 to the Registrant's Quarterly Report on Form 10-Q for the period ended June 30, 2014 filed on July 29, 2014 (File No. 001-15373)).

3.7 Amendment to the Certificate of Incorporation of Registrant (incorporated herein by reference to Exhibit 3.8 to Registrant’s Quarterly Report on Form 10-Q for the period ended June 30, 2019 filed on July 26, 2019 (File No. 001-15373)).

3.8 Amendment to the Certificate of Incorporation of Registrant (incorporated herein by reference to Appendix C to Registrant’s Registration Statement on Form S-4/A filed on June 2, 2021 (File No. 333-256265)).

3.9 Certificate of Designations of Registrant for Fixed Rate Cumulative Perpetual Preferred Stock, Series A, dated December 17, 2008 (incorporated herein by reference to Exhibit 3.1 to Registrant's Current Report on Form 8-K filed on December 23, 2008 (File No. 001-15373)).

3.10 Certificate of Elimination of Registrant’s Certificate of Designation, Preferences, and Rights of the Fixed Rate Cumulative Perpetual Preferred Stock, Series A, dated November 9, 2021 (incorporated herein by reference to Exhibit 3.1 to Registrant’s Current Report on Form 8-K filed on November 9, 2021 (File No. 001-15373)).

3.11 Certificate of Designation of Registrant of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A, dated November 16, 2021 (incorporated herein by reference to Exhibit 3.1 to Registrant’s Current Report on Form 8-K filed on November 17, 2021 (File No. 001-15373)).

3.12 Amended and Restated Bylaws of Registrant (incorporated herein by reference to Exhibit 3.1 to Registrant's Current Report on Form 8-K filed on June 12, 2015 (File No. 001-15373)).

4.1 Long-term borrowing instruments are omitted pursuant to Item 601(b)(4)(iii) of Regulation S-K. The Company undertakes to furnish copies of such instruments to the Securities and Exchange Commission upon request.

*31.1 Chief Executive Officer’s Certification required by Rule 13(a)-14(a).

*31.2 Chief Financial Officer’s Certification required by Rule 13(a)-14(a).

**32.1 Chief Executive Officer Certification pursuant to 18 U.S.C. § 1350, as adopted pursuant to section § 906 of the Sarbanes-Oxley Act of 2002.

**32.2 Chief Financial Officer Certification pursuant to 18 U.S.C. § 1350, as adopted pursuant to section § 906 of the Sarbanes-Oxley Act of 2002.

101.INS XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

101.SCH Inline XBRL Taxonomy Extension Schema Document.

101.CAL Inline XBRL Taxonomy Extension Calculation Linkbase Document.

101.LAB Inline XBRL Taxonomy Extension Label Linkbase Document.

101.PRE Inline XBRL Taxonomy Extension Presentation Linkbase Document.

101.DEF Inline XBRL Taxonomy Extension Definitions Linkbase Document.

104 The cover page of Enterprise Financial Services Corp’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2026, formatted in Inline XBRL (contained in Exhibit 101).

• Filed herewith

** Furnished herewith. Notwithstanding any incorporation of this Quarterly Statement on Form 10-Q in any other filing by the Registrant, Exhibits furnished herewith and designated with two (**) shall not be deemed incorporated by reference to any other filing unless specifically otherwise set forth herein or therein.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Clayton, State of Missouri, on the day of May 1, 2026.