SITE · SiteOne Landscape Supply, Inc.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On June 2, 2025, the Reporting Person was granted 2,189 RSUs, vesting in four equal annual installments beginning on June 2, 2026, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 sales plan adopted by the Reporting Person on February 25, 2026.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 sales plan adopted by the Reporting Person on February 25, 2026.

Represents deferred stock units granted as director fees. The deferred stock units vest in full upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026. Settlement is deferred until the earlier of the Reporting Person's termination of board service and a change in control of the Company.

Includes deferred stock units.

RSUs convert into common stock on a one-for-one basis.

The RSUs will vest and settle upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026, in each case subject to the Reporting Person's continued service as a non-employee director.

Represents deferred stock units granted as director fees. The deferred stock units vest in full upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026. Settlement is deferred until the earlier of the Reporting Person's termination of board service and a change in control of the Company.

Includes deferred stock units.

RSUs convert into common stock on a one-for-one basis.

The RSUs will vest and settle upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026, in each case subject to the Reporting Person's continued service as a non-employee director.

Represents deferred stock units granted as director fees. The deferred stock units vest in full upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026. Settlement is deferred until the earlier of the Reporting Person's termination of board service and a change in control of the Company.

Includes deferred stock units.

Represents deferred stock units granted as director fees. The deferred stock units vest in full upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026. Settlement is deferred until the earlier of the Reporting Person's termination of board service and a change in control of the Company.

Includes deferred stock units.

RSUs convert into common stock on a one-for-one basis.

The RSUs will vest and settle upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026, in each case subject to the Reporting Person's continued service as a non-employee director.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On May 14, 2025, the Reporting Person was granted 1,125 RSUs, vesting and settling upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 14, 2025, in each case subject to the Reporting Person's continued service as a non-employee director.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On May 14, 2025, the Reporting Person was granted 1,125 RSUs, vesting and settling upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 14, 2025, in each case subject to the Reporting Person's continued service as a non-employee director.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On May 14, 2025, the Reporting Person was granted 1,125 RSUs, vesting and settling upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 14, 2025, in each case subject to the Reporting Person's continued service as a non-employee director.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report settlement of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On May 11, 2023, the Reporting Person was granted 878 RSUs, vesting upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 11, 2024, in each case subject to the Reporting Person's continued service as a non-employee director, and settling on May 1, 2026.

Filed to report settlement of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

20,621 options were granted on May 12, 2016, and vested and became exercisable ratably in four installments on each anniversary of May 12, 2016. Prior to the transactions reported on this Form 4, 3,755 of these options that remain outstanding had vested.

Reflects the transfer of 10,000 shares to a family trust.

Reflects indirect ownership by a family trust for which the Reporting Person's spouse serves as trustee.

Reflects the transfer of 10,000 shares to a family trust.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 10, 2022, the Reporting Person was granted 1,021 RSUs, vesting in four equal annual installments beginning on February 10, 2023, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 10, 2022, the Reporting Person was granted 289 RSUs, vesting in four equal annual installments beginning on February 10, 2023, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 10, 2022, the Reporting Person was granted 1,114 RSUs, vesting in four equal annual installments beginning on February 10, 2023, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 10, 2022, the Reporting Person was granted 6,317 RSUs, vesting in four equal annual installments beginning on February 10, 2023, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 10, 2022, the Reporting Person was granted 929 RSUs, vesting in four equal annual installments beginning on February 10, 2023, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 9, 2023, the Reporting Person was granted 1,450 RSUs, vesting in four equal annual installments beginning on February 9, 2024, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 9, 2023, the Reporting Person was granted 363 RSUs, vesting in four equal annual installments beginning on February 9, 2024, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 9, 2023, the Reporting Person was granted 1,339 RSUs, vesting in four equal annual installments beginning on February 9, 2024, subject to the Reporting Person's continued employment.

Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

On February 9, 2023, the Reporting Person was granted 8,034 RSUs, vesting in four equal annual installments beginning on February 9, 2024, subject to the Reporting Person's continued employment.