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Doug Black has served as SiteOne's Chief Executive Officer since April 2014, and as the Chairman of the Board since June 2017. Prior to joining SiteOne, Mr. Black was President and Chief Operating Officer of Oldcastle Inc., an integrated building materials manufacturer and distributor and a wholly owned subsidiary of Irish-based CRH plc. During his 18-year career with Oldcastle, Mr. Black led the company's entry into building products distribution and then held several senior leadership roles, including Chief Operating Officer and Chief Executive Officer of Oldcastle Architectural Products and Chief Operating Officer and Chief Executive Officer of Oldcastle Materials. Prior to Oldcastle, Mr. Black's business career began at McKinsey & Company in 1992 where he led strategy, sales force effectiveness and plant improvement projects in the telecommunications, airline, lumber, paper and packaging industries. While serving as a U.S. Army Engineer Officer from 1986 to 1990, he completed construction projects in the Southeastern U.S., Central America and South America. Mr. Black earned an M.B.A. from Duke University's Fuqua School of Business as a Fuqua Scholar and a B.S. in Mathematical Science/Civil Engineering from the U.S. Military Academy, West Point, where he was an AP all-American fullback and NCAA Scholar Athlete.

Shannon Versaggi has served as SiteOne's Executive Vice President Marketing, Category Management, Digital and Pricing since May 2025. Ms. Versaggi most recently served as SiteOne's Senior Vice President Marketing, Category Management and Pricing from April 2024 to May 2025 and previously as Chief Marketing Officer from February 2020 to April 2024. Prior to joining SiteOne, Ms. Versaggi was Vice President, Integrated Marketing at Lowe's Companies. During her 16-year career at Lowe's, Ms. Versaggi held various marketing leadership positions including Vice President, Media and Planning; Director of Media; Director of Marketing Strategy; and Product Marketing Director. Prior to Lowe's, she began her career in finance as a Portfolio Specialist at SunTrust Banks. Ms. Versaggi earned an M.B.A. from the Terry College of Business at the University of Georgia and a B.S.B.A. at the Kenan-Flagler Business School at the University of North Carolina?-?Chapel Hill.

William (Bill) W. Douglas III serves as our Lead Director and has been one of our directors since April 2016. In June 2016, Mr. Douglas retired as Executive Vice President of Coca-Cola Enterprises, Inc. (CCE). During Mr. Douglas's tenure at CCE, it was one of the largest independent bottlers and distributors for The Coca-Cola Company and operated across the United States and Western Europe. Mr. Douglas served as Executive Vice President, Supply Chain at CCE until April 2015. Prior to that, he was Executive Vice President & Chief Financial Officer of CCE from May 2008 to November 2013, Senior Vice President and Chief Financial Officer of CCE from May 2005 to May 2008, and Vice President, Controller and Principal Accounting Officer from July 2004 until May 2005. Prior to joining CCE, Mr. Douglas served as Chief Financial Officer of Coca-Cola HBC, one of the largest bottlers of non-alcoholic beverages in Europe. Mr. Douglas currently serves on the Board of Directors of Monster Beverage Corporation and Dollar Tree, Inc., including each of their respective Audit Committees, and previously served on the Board of Directors of Coca Cola Hellenic, which is listed on the London Stock Exchange and the Athens Stock Exchange. Mr. Douglas received a degree in Accounting from the J.M. Tull School of Accounting at the University of Georgia. Public Company Directorships: Monster Beverage Corporation and Dollar Tree, Inc.

Jack L. Wyszomierski has served as one of our directors since April 2016. From June 2004 to June 2009, Mr. Wyszomierski served as the Executive Vice President and Chief Financial Officer of VWR International, LLC, a supplier of laboratory supplies, equipment and supply chain solutions to the global research laboratory industry. From 1982 to 2003, Mr. Wyszomierski held positions of increasing responsibility within the finance group at Schering-Plough Corporation, a health care company, culminating with his appointment as Executive Vice President and Chief Financial Officer in 1996. Prior to joining Schering-Plough, he was responsible for capitalization planning at Joy Manufacturing Company, a producer of mining equipment, and was a management consultant at Data Resources, Inc. Mr. Wyszomierski currently serves on the Board of Directors of Exelixis, Inc. and Xoma Royalty Corp. (formerly known as Xoma Corp.). He previously served on the Board of Directors of Unigene Laboratories, Inc. and Athersys, Inc. He holds an M.S. in Industrial Administration and a B.S. in Administration, Management Science and Economics from Carnegie Mellon University. Public Company Directorships: Exelixis, Inc. and Xoma Royalty Corp.

Jeri L. Isbell has served as one of our directors since October 2016. She was Vice President-Human Resources and Corporate Communications at Lexmark International, Inc., a leading developer, manufacturer, and supplier of printing, imaging, device management, managed print services, document workflow and business process, and content management solutions, a position she held from 2003 until her retirement in December 2016. During her 24-year tenure at Lexmark, she also held a number of leadership positions including Vice President of Compensation and Benefits, Vice President of Finance and Division Chief Financial Officer, and U.S. Controller. Ms. Isbell began her career at IBM. She currently serves as a member of the Board of Directors of Atkore Inc. Ms. Isbell holds a B.B.A. in Accounting from Eastern Kentucky University and an M.B.A. from Xavier University. She is a certified public accountant. Ms. Isbell was honored with a NACD Directorship 100 designation in 2021, is also a NACD Board Leadership Fellow and is NACD Directorship Certified. Public Company Directorships: Atkore Inc.

Fred M. Diaz has served as one of our directors since August 2017. From April 2018 to March 2020, Mr. Diaz served as President, Chief Executive Officer and Chairman of the Board of Mitsubishi Motors North America, Inc. He previously served in executive management roles at Nissan, most recently as Division Vice President and General Manager, North America, Trucks and Commercial Vehicles, of Nissan North America, Inc. Prior to that, Mr. Diaz served as Senior Vice President, Sales, Marketing and Operations, of Nissan USA. Before joining Nissan in 2013, Mr. Diaz spent 24 years at Chrysler Corporation, where he held a number of executive management roles, including President and Chief Executive Officer of Chrysler's Ram Truck brand and President and Chief Executive Officer, Chrysler de Mexico and Latin America. He currently serves as a member of the Board of Directors of Archer Aviation Inc., Smith & Wesson Brands, Inc. and Valero Energy Corporation. He is also a National Association of Corporate Directors (NACD) Board Leadership Fellow. Mr. Diaz is a graduate of Texas Lutheran University and holds an M.B.A. from Central Michigan University. Public Company Directorships: Archer Aviation Inc., Smith & Wesson Brands, Inc. and Valero Energy Corporation.

W. Roy Dunbar has served as one of our directors since March 2017. He was Chairman of the Board of Network Solutions, a technology company and web service provider, and was the Chief Executive Officer from January 2008 until October 2009. Mr. Dunbar also served as the President of Global Technology and Operations for MasterCard Incorporated from September 2004 until January 2008. Prior to MasterCard, Mr. Dunbar worked at Eli Lilly and Company for 14 years, serving as President of Intercontinental Operations, and earlier as Chief Information Officer. He currently serves on the Board of Directors of McKesson Corporation, Johnson Controls International PLC and Duke Energy Corporation and previously served on the boards of Humana Inc., Lexmark International and iGate. Mr. Dunbar was named to NACD Directorship 100 in 2015 and is a NACD Board Leadership Fellow. He is a graduate of Manchester University in the United Kingdom and holds an M.B.A. from Manchester Business School. Public Company Directorships: McKesson Corporation, Johnson Controls International PLC and Duke Energy Corporation.

Judy Sansone has served as one of our directors since May 2024. From October 2020 to October 2023, Ms. Sansone served as the Executive Vice President and Chief Commercial Officer of Sysco Corporation, the largest global distributor of food and related products primarily to the foodservice or food-away-from-home industry, where she was responsible for, among other things, commercial strategy and growth, merchandising, marketing, ecommerce development, and digital commercialization. Ms. Sansone recently retired from her role as an advisor for Sysco. Prior to that, Ms. Sansone spent over forty years at CVS Health Corporation, where she held a number of executive roles, including serving as SVP, Front Store Business & Chief Merchant from September 2011 to May 2020. She holds an associate degree from Holyoke Community College.

Eric Elema has served as SiteOne's Executive Vice President, Chief Financial Officer and Assistant Secretary of the Company since January 1, 2026. Mr. Elema most recently served as SiteOne's Vice President, Finance and Corporate Controller from 2016 to 2025. In this role, Mr. Elema held responsibility for the Company's accounting, finance, shared services and treasury functions. Prior to joining SiteOne, Mr. Elema served as Vice President and Business Unit Controller and Region Controller with McKesson Technology Solutions and Skanska USA Building, Inc., respectively, and held various other finance and controller positions throughout his 35 years of professional experience. Mr. Elema earned a B.A. in Finance from Michigan State University and is a Certified Public Accountant.

On March 31, 2026, SiteOne Landscape Supply, Inc. Daniel Laughlin, was appointed as Executive Vice President, Strategy and Development effective March 31, 2026. Mr. Laughlin previously served in progressive leadership roles in Strategy and Development at SiteOne from 2014 to 2021. During this time, Mr. Laughlin played a central role in executing the Company's acquisition strategy while building strong relationships with leadership teams and acquisition partners. Prior to rejoining SiteOne in January 2026 as Senior Vice President of Strategy and Development, Mr. Laughlin held senior strategy and development roles at ServiceMaster Brands, Marcone Supply, and most recently Alloy Roofing. He has a degree in Finance and Accounting from the University of North Carolina at Charlotte and an MBA from the Wake Forest University School of Business.