BYD · Boyd Gaming Corp

Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

Represents shares of underlying Career Restricted Share Units that vested on 6/30/3036 as a result of the Reporting Person’s retirement as an officer of the Company as of December 31, 2025.

By Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust.

Reflects withholding of shares issuable upon the early vesting of Restricted Stock Units to pay taxes associated with the Reporting Person’s retirement as an officer of the Company as of December 31, 2025.

By Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust.

This transaction was executed in a single trade of $87.69 per share.

This transaction was executed in multiple transactions ranging from $86.52 to $85.01.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 transactions ranging from $80.94 to $80.88 .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.

The Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

The Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

By Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust.

The Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

The Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

The Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

The Restricted Stock Units ("RSUs") were granted to the Reporting Person for no consideration under Issuer's 2020 Stock Incentive Plan. The RSUs fully vested, and one share of Issuer common stock was issued for each RSU, on the date of grant.

By the JRB-TAT Bailey Family Trust.

This transaction was executed in multiple transactions ranging from $84.30 to $84.00.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 Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust.

This transaction was executed in multiple transactions ranging from $86.27 to $85.00.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 Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust.

This transaction was executed in multiple trades at prices ranging from $83.28 to $83.99. 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.

Options granted under Boyd Gaming Corporation's 2012 Stock Incentive Plan. Vesting plan calls for options to become exercisable at the rate of 33.333% per year on the first day of each successive 12 month period commencing one year from grant date of November 8, 2016.

This transaction was executed in multiple trades at prices ranging from $85.17 to $86.19 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.

Options granted under Boyd Gaming Corporation's 2012 Stock Incentive Plan. Vesting plan calls for options to become exercisable at the rate of 33.333% per year on the first day of each successive 12 month period commencing one year from grant date of November 8, 2016.

The Reporting Person was awarded 35,608 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 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.

Represents shares underlying Performance Share Units that vested on February 22, 2026

Represents shares underlying Performance Share Units that vested on February 22, 2026.

Represents shares underlying Performance Share Units that vested on February 22, 2026

Represents shares underlying Performance Share Units that vested on February 22, 2026.

By Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust.

Represents shares underlying Performance Share Units that vested on February 22, 2026.

Represents shares underlying Performance Share Units that vested on February 22, 2026

The Reporting Person was awarded 42,730 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 are subject to the forfeiture and other terms and conditions contained in the award agreement and the 2020 Stock Incentive Plan

The Reporting Person was awarded 11,869 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 are subject to the forfeiture and other terms and conditions contained in the award agreement and the 2020 Stock Incentive Plan

The Reporting Person was awarded 16,024 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 are subject to the forfeiture and other terms and conditions contained in the award agreement and the 2020 Stock Incentive Plan

Represents shares underlying Performance Share Units that vested on February 22, 2026

The Reporting Person was awarded 1,335 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 are subject to the forfeiture and other terms and conditions contained in the award agreement and the 2020 Stock Incentive Plan

This transaction was executed in multiple transactions ranging from $85.03 to $84.85.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.

The Career Restricted Stock Units were granted to the Reporting Person for no consideration pursuant to the Issuer's Career Shares Program under its 2020 Stock Incentive Plan. Each Career Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock.

The Career Restricted Stock Units generally will be paid out in shares of lssuer common stock at the time of retirement at a level determined by the grantee's attained age and years of continuous service at retirement.

The Career Restricted Stock Units were granted to the Reporting Person for no consideration pursuant to the Issuer's Career Shares Program under its 2020 Stock Incentive Plan. Each Career Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock.

The Career Restricted Stock Units generally will be paid out in shares of lssuer common stock at the time of retirement at a level determined by the grantee's attained age and years of continuous service at retirement

The Career Restricted Stock Units were granted to the Reporting Person for no consideration pursuant to the Issuer's Career Shares Program under its 2020 Stock Incentive Plan. Each Career Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock.

The Career Restricted Stock Units generally will be paid out in shares of lssuer common stock at the time of retirement at a level determined by the grantee's attained age and years of continuous service at retirement.

The Career Restricted Stock Units were granted to the Reporting Person for no consideration pursuant to the Issuer's Career Shares Program under its 2020 Stock Incentive Plan. Each Career Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock.

The Career Restricted Stock Units generally will be paid out in shares of lssuer common stock at the time of retirement at a level determined by the grantee's attained age and years of continuous service at retirement.

The Career Restricted Stock Units were granted to the Reporting Person for no consideration pursuant to the Issuer's Career Shares Program under its 2020 Stock Incentive Plan. Each Career Restricted Stock Unit represents a contingent right to receive one share of Issuer common stock.

The Career Restricted Stock Units generally will be paid out in shares of lssuer common stock at the time of retirement at a level determined by the grantee's attained age and years of continuous service at retirement.

This transaction was executed in multiple transactions ranging from $80.51 to $80.23.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.

This transaction was executed in multiple trades at prices ranging from $87.10 to $86.34. 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 Marianne Boyd Johnson as Trustee of the Marianne Boyd Johnson Gaming Properties Trust.

On August 25, 2025, the reporting person gifted 50,000 shares of common stock to the KJS Family Foundation.

This transaction was executed in multiple trades at prices ranging from $85.01 to $85.45. 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 $85.25 to $85.65. 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.