X0306 4 2022-11-04 0000906553 BOYD GAMING CORP BYD 0001186738 BOYD WILLIAM R 6465 S. RAINBOW BOULEVARD LAS VEGAS NV 89118 1 1 0 0 Vice President Common Stock 2022-11-04 4 S 0 50000 55.58 D 1744522 I By Trust Common Stock 2022-11-07 4 S 0 50000 57.47 D 1694522 I By Trust Common Stock 30634 D Common Stock 41216 I By Trust* Common Stock 10000 I By Trust* Common Stock 10000 I By Trust* Common Stock 192000 I By LLC This transaction was executed in multiple trades at prices ranging from $55.50 to $55.78. 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 ("WRBGPT"), of which the reporting person is the trustee, settlor and beneficiary. This transaction was executed in multiple trades at prices ranging from $57.20 to $57.875. 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 Sean W. Johnson Education Trust, dated July 1, 1997, of which the reporting person is the trustee. By the Taylor J. Boyd Trust, of which the reporting person's child is the trustee and beneficiary. By the William S. Boyd Trust, of which the reporting person's child is the trustee and beneficiary. On June 13, 2022, the reporting person agreed to transfer 192,000 shares from WRBGPT to WSB-BYD, LLC. The reporting person's pecuniary interest in the transferred shares did not change. *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. 2022-11-08