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sbcf-20260428

0000730708false00007307082026-04-282026-04-28

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): April 28, 2026

SEACOAST BANKING CORPORATION OF FLORIDA

(Exact Name of Registrant as Specified in Charter)

Florida000-1366059-2260678

(State or Other Jurisdiction of Incorporation)(Commission File Number)(IRS Employer Identification No.)

815 COLORADO AVENUE,STUARTFL 34994

(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code (772) 287-4000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered

Common Stock, $0.10 par valueSBCFNasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

SEACOAST BANKING CORPORATION OF FLORIDA

Item 2.02    Results of Operations and Financial Condition

On April 28, 2026, Seacoast Banking Corporation of Florida ("Seacoast or the "Company") announced its financial results for the quarter ended March 31, 2026. A copy of the press release announcing Seacoast’s results for the quarter ended March 31, 2026, is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Item 7.01    Regulation FD Disclosure

On April 29, 2026, Seacoast will hold an investor conference call to discuss its financial results for the quarter ended March 31, 2026. The conference call begins at 10:00 a.m. Eastern Time. Attached as Exhibit 99.2 are charts containing information used in the conference call and incorporated herein by reference, which are also available on the Company's website at www.seacoastbanking.com. All information included in the charts is presented as of March 31, 2026, and the Company does not assume any obligation to correct or update said information in the future, unless required to do so by law.

The information in Items 2.02 and 7.01, as well as Exhibits 99.1 and 99.2 is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, unless expressly stated in such filing.

Item 9.01    Financial Statements and Exhibits

(d) Exhibits

Exhibit No.Description

99.1 Press Release dated April 28, 2026, with respect to Seacoast's financial results for the quarter ended March 31, 2026

99.2 Data on website containing information used in the conference call to be held on April 29, 2026

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

Exhibits 99.1 and 99.2 referenced herein, contain “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 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

sbcf-202601230000730708false00007307082026-01-232026-01-23

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): January 23, 2026

SEACOAST BANKING CORPORATION OF FLORIDA

(Exact Name of Registrant as Specified in Charter)

Florida000-1366059-2260678 (State or Other Jurisdiction of Incorporation)(Commission File Number)(IRS Employer Identification No.)

815 COLORADO AVENUE,STUARTFL 34994

(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code (772) 287-4000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐    Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐    Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, $0.10 par valueSBCFNasdaq Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

SEACOAST BANKING CORPORATION OF FLORIDA

Item 2.02    Results of Operations and Financial Condition

On January 29, 2026, Seacoast Banking Corporation of Florida ("Seacoast or the "Company") announced its financial results for the quarter and year ended December 31, 2025. A copy of the press release announcing Seacoast’s results for the quarter and year ended December 31, 2025, is attached hereto as Exhibit 99.1 and incorporated herein by reference.

Item 7.01    Regulation FD Disclosure

On January 30, 2026, Seacoast will hold an investor conference call to discuss its financial results for the quarter and year ended December 31, 2025. The conference call begins at 10:00 a.m. Eastern Time. Attached as Exhibit 99.2 are charts containing information used in the conference call and incorporated herein by reference, which are also available on the Company's website at www.seacoastbanking.com. All information included in the charts is presented as of December 31, 2025, and the Company does not assume any obligation to correct or update said information in the future, unless required to do so by law.

The information in Items 2.02 and 7.01, as well as Exhibits 99.1 and 99.2 is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, unless expressly stated in such filing.

Item 8.01    Other Events

On January 23, 2026, Seacoast repositioned a portion of its available for sale securities portfolio. The Company sold securities with an average book yield of 1.9%, resulting in a pre-tax loss of approximately $39.5 million. The proceeds, approximately $277 million, were reinvested in primarily agency mortgage-backed securities with an average taxable equivalent book yield of 4.8%.

Item 9.01    Financial Statements and Exhibits

(d) Exhibits

Exhibit No.Description 99.1Press Release dated January 29, 2026, with respect to Seacoast's financial results for the quarter and year ended December 31, 2025

99.2Data on website containing information used in the conference call to be held on January 30, 2026

104Cover Page Interactive Data File (embedded within the Inline XBRL document)

Exhibits 99.1 and 99.2 referenced herein, contain “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 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 historica