Other Events Declaration of Cash Dividend As reported in the Financial Results News Release, on July 27, 2026, the Park Board of Directors declared a $1.10 per common share quarterly cash dividend in respect of Park's common shares. The cash dividend is payable on September 10, 2026 to common shareholders of record as of the close of business on August 21, 2026. A copy of the Financial Results News Release is included as Exhibit 99.1 and the portion thereof addressing the declaration of the q…

Regulation FD Disclosure On February 1, 2026, First Citizens Bancshares, Inc., a Tennessee corporation (“First Citizens”) merged into Park, with Park continuing as the surviving corporation. Immediately following the merger, First Citizens National Bank ("FCNB"), a national banking association and a wholly-owned subsidiary of First Citizens, merged into The Park National Bank ("PNB"), with PNB as the surviving bank. FCNB’s former operations now comprise Park’s newly established Tennessee regi…

Results of Operations and Financial Condition On July 27, 2026, Park National Corporation (“Park”) issued a news release (the “Financial Results News Release”) announcing financial results for the three and six months ended June 30, 2026. A copy of the Financial Results News Release is included as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein. Non-U.S. GAAP Financial Measures

The filing is about the approval of new long-term incentive plans for employees and non-employee directors.

Results of Operations and Financial Condition On April 24, 2026, Park National Corporation (“Park”) issued a news release (the “Financial Results News Release”) announcing financial results for the three months ended March 31, 2026. A copy of the Financial Results News Release is included as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein. Non-U.S. GAAP Financial Measures

Other Events Declaration of Cash Dividend As reported in the Financial Results News Release, on April 24, 2026, the Park Board of Directors declared a $1.10 per common share quarterly cash dividend in respect of Park's common shares. The cash dividend is payable on June 10, 2026 to common shareholders of record as of the close of business on May 15, 2026. A copy of the Financial Results News Release is included as Exhibit 99.1 and the portion thereof addressing the declaration of the quarterl…

Regulation FD Disclosure On February 1, 2026, First Citizens Bancshares, Inc., a Tennessee corporation (“First Citizens”) merged into Park, with Park continuing as the surviving corporation. Immediately following the merger, First Citizens National Bank ("FCNB"), a national banking association and a wholly-owned subsidiary of First Citizens, merged into The Park National Bank ("PNB"), with PNB as the surviving bank. FCNB’s former operations now comprise Park’s newly established Tennessee regi…

Director — Jeffrey D. Agee: Mr. Agee was appointed as a director and entered into an employment agreement with Park National Bank, leading the new Tennessee Region.

Completion of Acquisition or Disposition of Assets On February 1, 2026, Park completed its previously announced Merger with First Citizens pursuant to the Merger Agreement. Immediately following the Merger, and also effective as of February 1, 2026, First Citizens' wholly owned banking subsidiary, First Citizens National Bank, a national banking association (“First Citizens National Bank”), merged with and into Park's wholly owned banking subsidiary, The Park National Bank, a national banking…

Other Events Declaration of Cash Dividend As reported in the Financial Results News Release, on January 26, 2026, the Park Board declared a $1.10 per common share quarterly cash dividend in respect of Park's common shares. The cash dividend is payable on March 10, 2026 to common shareholders of record as of the close of business on February 20, 2026. A copy of the Financial Results News Release is included as Exhibit 99.1 and the portion thereof addressing the declaration of the quarterly cas…

Results of Operations and Financial Condition On January 26, 2026, Park National Corporation (“Park”) issued a news release (the “Financial Results News Release”) announcing financial results for the three and twelve months ended December 31, 2025. A copy of the Financial Results News Release is included as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein. Non-U.S. GAAP Financial Measures

Director — C. Daniel DeLawder: The filing announces the planned retirement of a long-serving director at the next annual meeting, which is an orderly succession rather than a sudden loss of a sitting executive.

Entry into a Material Definitive Agreement Agreement and Plan of Merger Overview On October 27, 2025, Park National Corporation, an Ohio corporation ("Park"), entered into an Agreement and Plan of Merger (the “Merger Agreement”) with First Citizens Bancshares, Inc., a Tennessee corporation (“First Citizens”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, First Citizens would merge with and into Park (the “Merger”), with Park continuing as…

Results of Operations and Financial Condition On October 27, 2025, Park issued a news release (the “Financial Results News Release”) announcing financial results for the three and nine months ended September 30, 2025. A copy of the Financial Results News Release is included as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein. Non-U.S. GAAP Financial Measures

Other Events Declaration of Cash Dividend As reported in the Financial Results News Release, on October 27, 2025, the Park Board declared a $1.07 per common share quarterly cash dividend in respect of Park's common shares and a special cash dividend of $1.25 per common share in respect of Park's common shares. The cash dividend and the special cash dividend are payable on December 10, 2025 to common shareholders of record as of the close of business on November 21, 2025. A copy of the Financi…

CEO — Matthew R. Miller: The filing announces a planned CEO succession where the current CEO transitions to Chairman and an internal candidate (President) is elected to succeed him, representing an orderly transition rather than a sudden loss of leadership.

Results of Operations and Financial Condition On July 28, 2025, Park National Corporation (“Park”) issued a news release (the “Financial Results News Release”) announcing financial results for the three and six months ended June 30, 2025. A copy of the Financial Results News Release is included as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein. Non-U.S. GAAP Financial Measures

Other Events Declaration of Cash Dividend As reported in the Financial Results News Release, on July 28, 2025, the Park Board declared a $1.07 per common share quarterly cash dividend in respect of Park's common shares. The cash dividend is payable on September 10, 2025 to common shareholders of record as of the close of business on August 15, 2025. A copy of the Financial Results News Release is included as Exhibit 99.1 and the portion thereof addressing the declaration of the quarterly cash…

Other Events On July 11, 2025, Park National Corporation (“Park”) provided notice under that certain Indenture, dated as of August 20, 2020, by and between Park and U.S. Bank National Association, as trustee (“U.S. Bank”), as supplemented by the First Supplemental Indenture dated August 20, 2020, that Park has elected to redeem on September 1, 2025 (the “Redemption Date”) all of Park’s $175,000,000 outstanding 4.50% Fixed-to-Floating Rate Subordinated Notes due 2030 (the “Notes”) at a redempt…

Results of Operations and Financial Condition On April 25, 2025, Park National Corporation (“Park”) issued a news release (the “Financial Results News Release”) announcing financial results for the three months ended March 31, 2025. A copy of the Financial Results News Release is included as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein. Non-U.S. GAAP Financial Measures

Other Events Declaration of Cash Dividend As reported in the Financial Results News Release, on April 25, 2025, the Park Board declared a $1.07 per common share quarterly cash dividend in respect of Park's common shares. The cash dividend is payable on June 10, 2025 to common shareholders of record as of the close of business on May 16, 2025. A copy of the Financial Results News Release is included as Exhibit 99.1 and the portion thereof addressing the declaration of the quarterly cash divide…

Other Events Declaration of Cash Dividend As reported in the Financial Results News Release, on January 27, 2025, the Park Board declared a $1.07 per common share quarterly cash dividend in respect of Park's common shares. The cash dividend is payable on March 10, 2025 to common shareholders of record as of the close of business on February 14, 2025. A copy of the Financial Results News Release is included as Exhibit 99.1 and the portion thereof addressing the declaration of the quarterly cas…

Director — Mark R. Ramser: The filing discloses the routine retirement of a director whose term is expiring at the annual meeting, with no indication of a sudden loss of a senior executive officer.

Results of Operations and Financial Condition On January 27, 2025, Park National Corporation (“Park”) issued a news release (the “Financial Results News Release”) announcing financial results for the three and twelve months ended December 31, 2024. A copy of the Financial Results News Release is included as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein. Non-U.S. GAAP Financial Measures

Results of Operations and Financial Condition On October 28, 2024, Park National Corporation (“Park”) issued a news release (the “Financial Results News Release”) announcing financial results for the three and nine months ended September 30, 2024. A copy of the Financial Results News Release is included as Exhibit 99.1 to this Current Report on Form 8-K and incorporated by reference herein. Non-U.S. GAAP Financial Measures