X0609 4 2026-05-01 0000906553 BOYD GAMING CORP BYD 0001186742 JOHNSON MARIANNE BOYD false 6465 S. RAINBOW BLVD. LAS VEGAS NV 89118 1 1 1 0 Chairman 0 Common Stock 39088 D Common Stock 2026-05-01 4 S 0 37086 85.27 D 1672722 I By Trust* Common Stock 2026-05-05 4 S 0 62914 84.03 D 1609808 I By Trust* Common Stock 1487858 I By Limited Partnership* Common Stock 4800000 I By Limited Liability Company* Common Stock 45482 I By Trust* Common Stock 25555 I By Trust* Common Stock 1100000 I By Limited Liability Company* Common Stock 4004000 I By Limited Liability Company* This transaction was executed in multiple transactions ranging from $86.27 to $85.00.The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. This transaction was executed in multiple transactions ranging from $84.30 to $84.00.The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. By Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust. By BG-00 Limited Partnership, of which the Marianne Boyd Gaming Properties Trust, of which the reporting person is the trustee, settlor and beneficiary, is the general partner thereof. By WSB-BYD, LLC, of which the reporting person is the Manager. By the Johnson Children's Trust Dated 6/24/96, Taylor J. Boyd, Trustee. By Marianne Boyd Johnson as Trustee of the Justin Boyd Education Trust Dated 11/1/99. By BG-SUB, LLC of which Marianne Boyd Johnson is the managing member thereof. By BYD-SST LLC, of which Marianne Boyd Johnson is the managing member thereof. *The reporting person expressly disclaims beneficial ownership of any securities of the Issuer except for those securities that are owned directly by the Reporting Person or to the extent of the Reporting Person's pecuniary interest in a trust or other entity which owns such securities. /s/ Uri Clinton, attorney-in-fact for Marianne Boyd Johnson 2026-05-05