X0508 4 2024-02-28 0000906553 BOYD GAMING CORP BYD 0001186742 JOHNSON MARIANNE BOYD 6465 S. RAINBOW BLVD. LAS VEGAS NV 89118 1 1 1 0 Executive Chairman 0 Common Stock 33494 D Common Stock 2024-02-28 4 A 0 13066 0 A 1495166 I By Trust* Common Stock 2024-02-28 4 F 0 5140 63.96 D 1490026 I By Trust* Common Stock 2024-02-28 4 A 0 6602 0 A 1496628 I By Trust Common Stock 4800000 I By Limited Liability Company Common Stock 39663 I By Trust* Common Stock 39463 I By Trust* Common Stock 25555 I By Trust* Common Stock 90964 I By Trust* Common Stock 3297040 I By Limited Partnership* Common Stock 1100000 I By Limited Liability Company* Represents shares underlying Performance Share Units that vested on February 28, 2024. The Reporting Person was awarded 6,602 Restricted Stock Units for no consideration pursuant to the Issuer's 2020 Stock Incentive Plan. Each Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock upon vesting. The Restricted Stock Units will vest in full on February 28, 2027. The Restricted Stock Units are subject to the forfeiture and other terms and conditions contained in the award agreement and the 2020 Stock Incentive Plan. By Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust. By WSB-BYD, LLC, of which the reporting person is the Manager. By Marianne Boyd Johnson as Trustee of the William Samuel Boyd Education Trust Dated 7/1/97. By Marianne Boyd Johnson as Trustee of the Josef William Boyd Education Trust Dated 7/1/97. By Marianne Boyd Johnson as Trustee of the Justin Boyd Education Trust Dated 11/1/99. By the Johnson Children's Trust Dated 6/24/96, Bruno Mark, Trustee. 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 BG-SUB, 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 2024-03-01