X0508 4 2023-08-25 0000906553 BOYD GAMING CORP BYD 0001186738 BOYD WILLIAM R 6465 S. RAINBOW BLVD. LAS VEGAS NV 89118 1 1 0 0 Vice President 0 Common Stock 20592 D Common Stock 2023-08-25 4 J 0 16640 D 1667970 I By Trust Common Stock 41398 I By Trust* Reflects the contribution of 16,640 shares of common stock of the issuer to WSB-BYD, LLC by the William R. Boyd Gaming Properties Trust. By the William R. Boyd Gaming Properties Trust, of which the reporting person is the trustee, settlor and beneficiary. By the Sean W. Johnson Education Trust, dated July 1, 1997, 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. 2023-08-29