X0508 4 2025-08-11 0000906553 BOYD GAMING CORP BYD 0001186738 BOYD WILLIAM R 6465 S. RAINBOW BLVD. LAS VEGAS NV 89118 1 0 0 0 0 Common Stock 2025-08-11 4 S 0 3226 81.57 D 24962 D Common Stock 2025-08-12 4 S 0 9774 81.61 D 15188 D Common Stock 1680447 I By Trust Common Stock 41552 I By Trust This transaction was executed in multiple trades at prices ranging from $81.60 to $81.50 The price reported above reflects the weighted average sale price. 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 trades at prices ranging from $81.80 to $81.50 The price reported above reflects the weighted average sale price. 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 the William R. Boyd Gaming Properties Trust, of which the reporting person is the trustee, settlor and beneficiary. By the Sean W. Johnson Separate Property Trust, dated 5/9/2019, of which the reporting person is the trustee. * 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 William R. Boyd. 2025-08-13