SiteOne Landscape Supply, Inc. — Director's Dealing 2021

May 17, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: SiteOne Landscape Supply, Inc. (SITE)
CIK: 0001650729
Period of Report: 2021-05-13

Reporting Person: Weller Greg (EVP of Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-13	Common Stock	M	1200	$8.02	Acquired	11503	Direct
2021-05-13	Common Stock	S	1200	$172.45	Disposed	10303	Direct
2021-05-13	Common Stock	M	500	$38.73	Acquired	10803	Direct
2021-05-13	Common Stock	S	500	$172.45	Disposed	10303	Direct
2021-05-13	Common Stock	M	1000	$77.04	Acquired	11303	Direct
2021-05-13	Common Stock	S	1000	$172.45	Disposed	10303	Direct
2021-05-13	Common Stock	M	500	$51.59	Acquired	10803	Direct
2021-05-13	Common Stock	S	500	$172.45	Disposed	10303	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-13	Stock Options (right to buy)	$8.02	M	1200	Disposed	2025-04-15	Common Stock (1200)	Direct
2021-05-13	Stock Options (right to buy)	$38.73	M	500	Disposed	2027-02-17	Common Stock (500)	Direct
2021-05-13	Stock Options (right to buy)	$77.04	M	1000	Disposed	2028-02-14	Common Stock (1000)	Direct
2021-05-13	Stock Options (right to buy)	$51.59	M	500	Disposed	2029-02-06	Common Stock (500)	Direct

Footnotes

F1: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 sales plan adopted by the Reporting Person on March 5, 2021.

F2: 46,472 options were granted on April 15, 2015, and vest and become exercisable ratably in five installments on each anniversary of April 15, 2015, subject to the Reporting Person's continued employment. Prior to the transactions reported on this Form 4, 6,094 of these options that remain outstanding had vested.

F3: 8,365 options were granted on February 17, 2017, and vest and become exercisable ratably in four installments on each anniversary of February 17, 2017, subject to the Reporting Person's continued employment. Prior to the transactions reported on this Form 4, 2,500 of these options that remain outstanding had vested.

F4: 8,750 options were granted on February 14, 2018, and vest and become exercisable ratably in four installments on each anniversary of February 14, 2018, subject to the Reporting Person's continued employment. Prior to the transactions reported on this Form 4, 4,562 of these options that remain outstanding had vested.

F5: 8,722 options were granted on February 6, 2019, and vest and become exercisable ratably in four installments on each anniversary of February 6, 2019, subject to the Reporting Person's continued employment. Prior to the transactions reported on this Form 4, 3,861 of these options that remain outstanding had vested.