Merger Announcement: Setting the Stage for Enterprise Growth

Additional Information About the Merger and Where to Find It

In connection with the proposed acquisition transaction, along with other relevant documents, a registration statement on Form S-4 will be filed with the SEC that will include a joint proxy statement/prospectus to be distributed to the shareholders of EFSC and FCBP in connection with their votes on the acquisition. SHAREHOLDERS OF EFSC AND FCBP ARE URGED TO READ THE REGISTRATION STATEMENT AND ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC, INCLUDING THE JOINT PROXY STATEMENT/PROSPECTUS THAT WILL BE PART OF THE REGISTRATION STATEMENT, AS WELL AS ANY AMENDMENTS OR SUPPLEMENTS TO THOSE DOCUMENTS, WHEN THEY BECOME AVAILABLE, BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT THE PROPOSED ACQUISITION AND RELATED MATTERS. FREE COPIES OF THESE DOCUMENTS MAY BE OBTAINED AS DESCRIBED BELOW.

The final joint proxy statement/prospectus will be mailed to shareholders of EFSC and FCBP. Investors and security holders will be able to obtain the documents, and any other documents EFSC has filed with the SEC, free of charge at the SEC’s website, www.sec.gov. In addition, documents filed with the SEC by EFSC in connection with the proposed acquisition will be available free of charge by (1) accessing EFSC’s website at www.enterprisebank.com under the “Investor Relations” link, (2) writing EFSC at 150 North Meramec, Clayton, Missouri 63105, Attention: Investor Relations, (3) accessing FCBP’s website at https://investors.firstchoicebankca.com under the “SEC Filings” tab, or (4) writing FCBP at 17785 Center Court Drive, N Suite 750, Cerritos, CA 90703, Attention: General Counsel.

Participants in Solicitation

FCBP and certain of their directors and executive officers, and EFSC and certain of their directors, executive officers and other certain members of management and employees, may be deemed to be participants in the solicitation of proxies from the shareholders of FCBP and the shareholders of EFSC in connection with the Merger. Information about the directors and executive officers of EFSC is set forth in the proxy statement for EFSC’s 2021 annual meeting of shareholders, as filed with the SEC on a Schedule 14A on March 17, 2021. Information about the directors and officers of FCBP will be set forth in the Form-10-K/A, to be filed with the SEC on or about April 27, 2021 and in the proxy statement of FCBP to be filed on Schedule 14A during the third quarter of 2021. Additional information regarding the interests of those participants and other persons who may be deemed participants in the transaction may be obtained by reading the joint proxy statement/prospectus regarding the proposed acquisition when it becomes available. Free copies of this document, once filed, may be obtained as described in the preceding paragraph.