X0508 4 2023-08-25 0000906553 BOYD GAMING CORP BYD 0000940434 BOYD WILLIAM S 6465 S. RAINBOW BLVD. LAS VEGAS NV 89118 0 0 1 1 Chair Emeritus 0 Common Stock 2023-08-25 4 J 0 382720 D 9287344 I By Trust Common Stock 4004000 I By Trust Common Stock 186617 I By Spouse* Reflects the contribution of 382,720 shares of common stock of the issuer to WSB-BYD, LLC by the William S. Boyd Gaming Properties Trust. By the William S. Boyd Gaming Properties Trust, of which the reporting person is the trustee, settlor, and beneficiary. By The WSB SS Irrevocable Trust, of which the reporting person is the settlor and beneficiary. * 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 S. Boyd. 2023-08-29