Seacoast Banking of Florida : SBCF Investor Presentation September 2023

INVESTOR PRESENTATION

SECOND QUARTER 2023

Cautionary Notice Regarding Forward-Looking Statements

This presentation contains "forward-looking statements" within the meaning, and protections, of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including, without limitation, statements about future financial and operating results, cost savings, enhanced revenues, economic and seasonal conditions in the Company's markets, and improvements to reported earnings that may be realized from cost controls, tax law changes, new initiatives and for integration of banks that the Company has acquired, including Professional Holding Corp., or expects to acquire, as well as statements with respect to Seacoast's objectives, strategic plans, expectations and intentions and other statements that are not historical facts. Actual results may differ from those set forth in the forward-looking statements.

Forward-looking statements include statements with respect to the Company's beliefs, plans, objectives, goals, expectations, anticipations, assumptions, estimates and intentions about future performance, and involve known and unknown risks, uncertainties and other factors, which may be beyond the Company's control, and which may cause the actual results, performance or achievements of Seacoast Banking Corporation of Florida ("Seacoast" or the "Company") or its wholly-owned banking subsidiary, Seacoast National Bank ("Seacoast Bank"), to be materially different from results, performance or achievements expressed or implied by such forward-looking statements. You should not expect the Company to update any forward-looking statements.

All statements other than statements of historical fact could be forward-looking statements. You can identify these forward- looking statements through the use of words such as "may", "will", "anticipate", "assume", "should", "support", "indicate", "would", "believe", "contemplate", "expect", "estimate", "continue", "further", "plan", "point to", "project", "could", "intend", "target" or other similar words and expressions of the future. These forward-looking statements may not be realized due to a variety of factors, including, without limitation: the impact of current and future economic and market conditions generally (including seasonality) and in the financial services industry, nationally and within Seacoast's primary market areas, including the effects of inflationary pressures, changes in interest rates, slowdowns in economic growth, and the potential for high unemployment rates, as well as the financial stress on borrowers and changes to customer and client behavior and credit risk as a result of the foregoing; potential impacts of the recent adverse developments in the banking industry highlighted by high- profile bank failures, including impacts on customer confidence, deposit outflows, liquidity and the regulatory response thereto; governmental monetary and fiscal policies, including interest rate policies of the Board of Governors of the Federal Reserve, as well as legislative, tax and regulatory changes, including those that impact the money supply and inflation and the possibility that the U.S. could default on its debt obligations; the risks of changes in interest rates on the level and composition of deposits (as well as the cost of, and competition for, deposits), loan demand, liquidity and the values of loan collateral, securities, and interest rate sensitive assets and liabilities; interest rate risks, sensitivities and the shape of the yield curve; changes in accounting policies, rules and practices; changes in retail distribution strategies, customer preferences and behavior generally and as a result of economic factors; changes in the availability and cost of credit and capital in the financial markets; changes in the prices, values and sales volumes of residential and commercial real estate; the Company's concentration in commercial real estate loans and in real estate collateral in Florida; Seacoast's ability to comply with any regulatory requirements; the effects of problems encountered by other financial institutions that adversely affect Seacoast or the banking industry; inaccuracies or other failures from the use of models, including the failure of assumptions and estimates, as well as differences in, and changes to, economic, market and credit conditions; the impact on the valuation of Seacoast's investments due to market volatility or counterparty payment risk, as well as the effect of a decline in stock market prices on our fee income from our wealth management business; statutory and regulatory dividend restrictions; increases in regulatory capital requirements for banking organizations generally; the risks of mergers, acquisitions and divestitures, including Seacoast's ability to continue to identify acquisition targets, successfully acquire and integrate desirable financial institutions and realize

expected revenues and revenue synergies; changes in technology or products that may be more difficult, costly, or less effective than anticipated; the Company's ability to identify and address increased cybersecurity risks; fraud or misconduct by internal or external, which Seacoast may not be able to prevent, detect or mitigate; inability of Seacoast's risk management framework to manage risks associated with the Company's business; dependence on key suppliers or vendors to obtain equipment or services for the business on acceptable terms, including the impact of supply chain disruptions; reduction in or the termination of Seacoast's ability to use the online- or mobile-based platform that is critical to the Company's business growth strategy; the effects of war or other conflicts, including the impacts related to or resulting from Russia's military action in Ukraine, acts of terrorism, natural disasters, including hurricanes in the Company's footprint, health emergencies, epidemics or pandemics, or other catastrophic events that may affect general economic conditions; unexpected outcomes of and the costs associated with, existing or new litigation involving the Company, including as a result of the Company's participation in the Paycheck Protection Program ("PPP"); Seacoast's ability to maintain adequate internal controls over financial reporting; potential claims, damages, penalties, fines and reputational damage resulting from pending or future litigation, regulatory proceedings and enforcement actions; the risks that deferred tax assets could be reduced if estimates of future taxable income from the Company's operations and tax planning strategies are less than currently estimated and sales of capital stock could trigger a reduction in the amount of net operating loss carryforwards that the Company may be able to utilize for income tax purposes; the effects of competition from other commercial banks, thrifts, mortgage banking firms, consumer finance companies, credit unions, non-bank financial technology providers, securities brokerage firms, insurance companies, money market and other mutual funds and other financial institutions operating in the Company's market areas and elsewhere, including institutions operating regionally, nationally and internationally, together with such competitors offering banking products and services by mail, telephone, computer and the Internet; the failure of assumptions underlying the establishment of reserves for possible credit losses; risks related to environmental, social and governance ("ESG") matters, the scope and pace of which could alter Seacoast's reputation and shareholder, associate, customer and third-party affiliations; the risks relating to bank acquisitions including the the merger with Professional Holding Corp. including, without limitation: the diversion of management's time on issues related to the merger; unexpected transaction costs, including the costs of integrating operations; the risks that the businesses will not be integrated successfully or that such integration may be more difficult, time-consuming or costly than expected; the potential failure to fully or timely realize expected revenues and revenue synergies, including as the result of revenues following the mergers being lower than expected; the risk of deposit and customer attrition; regulatory enforcement and litigation risk; any changes in deposit mix; unexpected operating and other costs, which may differ or change from expectations; the risks of customer and employee loss and business disruptions, including, without limitation, as the result of difficulties in maintaining relationships with employees; increased competitive pressures and solicitations of customers by competitors; as well as the difficulties and risks inherent with entering new markets; and other factors and risks described under "Risk Factors" herein and in any of the Company's subsequent reports filed with the SEC and available on its website at www.sec.gov

All written or oral forward-looking statements attributable to us are expressly qualified in their entirety by this cautionary notice, including, without limitation, those risks and uncertainties described in the Company's annual report on Form 10-K for the year ended December 31, 2022 and quarterly report on Form 10-Q for the quarters ended March 31, 2023 and June 30, 2023 under "Special Cautionary Notice Regarding Forward-Looking Statements" and "Risk Factors", and otherwise in the Company's SEC reports and filings. Such reports are available upon request from the Company, or from the Securities and Exchange Commission, including through the SEC's Internet website at www.sec.gov.

SECOND QUARTER 2023 INVESTOR PRESENTATION		2

01 ABOUT SEACOAST BANK

02 OUTLOOK

03 COMPANY PERFORMANCE

04 APPENDIX

AGENDA

ABOUT SEACOAST BANK

Valuable Florida Franchise with Strong Capital and Liquidity

SEACOAST BANK FOOTPRINT

Tampa

St. Petersburg

MSA

Naples

Fort Myers

MSA

Jacksonville

MSA

Orlando

MSA

Port St. Lucie

MSA

West Palm Beach

Fort Lauderdale

Miami

MSA

• $15.0 billion in assets as of June 30, 2023, operating in the nation's fastest growing and third most populated state
• Strong presence in Florida's most attractive markets
• • #1 Florida-based bank in Orlando MSA
  • #1 Florida-based bank in Palm Beach county
  • #1 market share in Port St. Lucie MSA
  • #2 Florida-based bank in St. Petersburg
• A top three publicly traded community bank headquartered in Florida

• Market Cap: $1.9 billion as of June 30, 2023
• Serving over 280,000 customers throughout Florida, with a wide variety of customer segments and industries
• Strong capital position, supporting further organic growth and opportunistic acquisitions
• Unique customer analytics capabilities, driving value creation with new, acquired, and existing customers

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