Other Events. On August 13, 2026, the Board of Directors of Boyd Gaming Corporation declared a cash dividend of $0.20 per share, payable October 15, 2026, to shareholders of record on September 15, 2026. 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: August 13, 2026 BOYD GAMING CORPORATION By: /s/ Lori M. Nelson Lori M. Nelson Senior Vice P…

Results of Operations and Financial Condition. On July 23, 2026, Boyd Gaming Corporation issued a press release announcing its financial results for the second quarter ended June 30, 2026. A copy of the press release is furnished hereto as Exhibit 99.1 and incorporated herein by reference.

Director — Stacia J. Andersen, George C. Roeth: Election of new directors and their committee assignments.

Director — Stacia J. Andersen, George C. Roeth: The Board of Directors appointed two new external directors.

The disclosure is related to the routine annual board election.

Other Events. On May 7, 2026, the Board of Directors of Boyd Gaming Corporation declared a cash dividend of $0.20 per share, payable July 15, 2026, to shareholders of record on June 15, 2026. 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: May 7 , 2026 BOYD GAMING CORPORATION By: /s/ Lori M. Nelson Lori M. Nelson Senior Vice President Financ…

Results of Operations and Financial Condition. On April 23, 2026, Boyd Gaming Corporation issued a press release announcing its financial results for the first quarter ended March 31, 2026. A copy of the press release is furnished hereto as Exhibit 99.1 and incorporated herein by reference.

Chief Administrative Officer — Stephen Thompson: Mr. Thompson is retiring for personal reasons and not because of any disagreement with the Company.

Other Events. On February 19, 2026, the Board of Directors of Boyd Gaming Corporation declared a cash dividend of $0.20 per share, payable April 15, 2026, to shareholders of record on March 16, 2026. 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: February 19 , 2026 BOYD GAMING CORPORATION By: /s/ Lori M. Nelson Lori M. Nelson Senior Vice Pr…

Results of Operations and Financial Condition. On February 5 , 2026, Boyd Gaming Corporation issued a press release announcing its financial results for the fourth quarter and year ended December 31, 2025. A copy of the press release is furnished hereto as Exhibit 99.1 and incorporated herein by reference.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth in

Entry into a Material Definitive Agreement. On January 21, 2026 (the “Closing Date”), Boyd Gaming Corporation (the “Company”) entered into that certain Amended and Restated Credit Agreement (the “New Credit Agreement”) among the Company, certain direct and indirect subsidiaries of the Company as guarantors (the “Guarantors”), Bank of America, N.A., as administrative agent, collateral agent and letter of credit issuer, Wells Fargo Bank, National Association, as swingline lender, and certain ot…

Termination of a Material Definitive Agreement. The information set forth in

Other Events. On December 4, 2025, the Board of Directors of Boyd Gaming Corporation declared a cash dividend of $0.18 per share, payable January 15, 2026, to shareholders of record on December 15, 2025. 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: December 4 , 2025 BOYD GAMING CORPORATION By: /s/ Lori M. Nelson Lori M. Nelson Senior Vice…

Results of Operations and Financial Condition. On October 23, 2025, Boyd Gaming Corporation issued a press release announcing its financial results for the third quarter ended September 30, 2025. A copy of the press release is furnished hereto as Exhibit 99.1 and incorporated herein by reference.

of this Current Report on Form 8-K is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any other filing under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in any such filing. Forward-looking Statements and Company Informat…

Other Events. On August 12, 2025, the Board of Directors of Boyd Gaming Corporation declared a cash dividend of $0.18 per share, payable October 15, 2025, to shareholders of record on September 15, 2025. 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: August 14 , 2025 BOYD GAMING CORPORATION By: /s/ Lori M. Nelson Lori M. Nelson Senior Vice…

Completion of Acquisition or Disposition of Assets. On July 31, 2025, Boyd Interactive Gaming Holdings, L.L.C. (“Boyd Interactive”), a wholly-owned subsidiary of Boyd Gaming Corporation (“Boyd Gaming”), completed the previously announced sale of its 5% equity interest (the “Equity Interest”) in FanDuel Group Parent, LLC (“FanDuel”) to TSE Holdings Ltd. (“Parent”), pursuant to that certain Equity Purchase Agreement (the “Purchase Agreement”), dated as of July 10, 2025, by and among Boyd Intera…

Results of Operations and Financial Condition. On July 24, 2025, Boyd Gaming Corporation issued a press release announcing its financial results for the second quarter ended June 30, 2025. A copy of the press release is furnished hereto as Exhibit 99.1 and incorporated herein by reference.

Entry into a Material Definitive Agreement. On July 10, 2025, Boyd Interactive Gaming Holdings, L.L.C. (“Boyd Interactive”), a wholly-owned subsidiary of Boyd Gaming Corporation (“Boyd Gaming”), entered into a definitive agreement (“Purchase Agreement”) with TSE Holdings Ltd. (“Parent”) and FanDuel Group Parent, LLC (“FanDuel”), pursuant to which Parent will purchase Boyd Interactive’s 5% equity interest (the “Equity Interest”) in FanDuel, and Boyd Gaming and FanDuel, or their respective affi…

COO — Theodore A. Bogich: The COO is retiring for personal reasons with a six-month notice period, indicating an orderly succession rather than a sudden loss of executive leadership.

The excerpt is a truncated header referencing a proxy proposal rather than disclosing a specific executive departure or appointment.

Results of Operations and Financial Condition. On April 24, 2025, Boyd Gaming Corporation issued a press release announcing its financial results for the first quarter ended March 31, 2025. A copy of the press release is furnished hereto as Exhibit 99.1 and incorporated herein by reference.

Other Events. On February 20, 2025, the Board of Directors of Boyd Gaming Corporation declared a cash dividend of $0.18 per share, payable April 15, 2025, to shareholders of record on March 17, 2025. 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Date: February 20 , 2025 BOYD GAMING CORPORATION By: /s/ Lori M. Nelson Lori M. Nelson Senior Vice Pr…

Results of Operations and Financial Condition. On February 6 , 2025, Boyd Gaming Corporation issued a press release announcing its financial results for the fourth quarter and year ended December 31, 2024. A copy of the press release is furnished hereto as Exhibit 99.1 and incorporated herein by reference.