Announcement PDF Mayfield Group Holdings Limited | ASX:MYG | ABN 57 010 597 672 3 Gidgie Court, Edinburgh SA 5111 Australia | mayfieldgroup.com.au ASX Release 22 April 2026 APPOINTMENT OF GENERAL MANAGER - COMMERCIAL, LEGALAND RISK Strengthening Commercial Capability to Support Strategic Growth Highlights: • Nick Saunders appointed as General Manager - Commercial, Legal and Risk, commencing 28 April 2026. • Currently General Counsel and Company Secretary at Hassell, leading governance, legal, commercial and M&A functions across an international business operating in six countries • Role will drive procurement optimisation, governance, compliance and M&A activities across the Group • Completes the senior leadership realignment communicated during the recent investor roadshow Mayfield Group Holdings Limited (ASX: MYG) (“Mayfield” or “the Company”) is pleased to announce the appointment of Mr Nick Saunders as General Manager - Commercial, Legal and Risk, effective 28 April 2026. The role will drive procurement optimisation, governance, compliance and M&A activities across the Group as the Company continues to scale its operations. This appointment completes a key element of the organisational realignment communicated to investors during the recent roadshow, joining the recently appointed COO (Andrew Naffin), CTIO (Chris Ware) and GM Mayfield Industries (Steve Clark) to form a strengthened executive team. About Nick Saunders Mr Saunders is a senior legal and commercial executive with extensive experience across construction, infrastructure and resources. He currently serves as General Counsel and Company Secretary at Hassell, an international architecture and design practice operating across Australia, the UK, Singapore, Hong Kong, China and the USA, where he leads governance, legal and commercial strategy across 11 corporate entities, negotiates major government and private contracts and oversees M&A due diligence. Prior to Hassell, Mr Saunders practised at global law firms Hogan Lovells (infrastructure and project finance) and Jones Day (construction disputes, including matters related to the Roy Hill, Gorgon and Ichthys LNG projects). He began his career in industry with EC&M Limited and O’Donnell Griffin, administering contracts for major Rio Tinto and BHP resources projects. Mr Saunders holds a Bachelor of Laws (First Class Honours) and a Bachelor of Commerce (Corporate Finance and Financial Accounting) from the University of Western Australia, where he was awarded several academic prizes, including the Mergers and Acquisitions Prize. He is admitted as a legal practitioner of the Supreme Court of Western Australia. CEO Commentary Group CEO Andrew Rowe said: “We are pleased to welcome Nick to the Mayfield team. As we scale the business across our opportunity pipeline and integrate two recent acquisitions, the complexity of our commercial environment is growing. Nick’s combination of top-tier legal practice, in-house general counsel leadership and hands-on industry experience in construction and resources is exactly the capability we need. With Nick joining Andrew Naffin, Chris Ware and Steve Clark, the leadership team we outlined to investors during the roadshow is now substantially in place. We have the right people to deliver on the opportunities ahead.” ASX:MYG | mayfieldgroup.com.au Strategic Context The GM Commercial, Legal and Risk appointment reflects the increasing scale and complexity of Mayfield’s operations as the Company executes on its three-pillar strategy: • Growing operational complexity: Multiple business units, two recent acquisitions (BE Switchcraft and SMEC Power and Technology), and operations in all mainland states require dedicated commercial leadership to optimise procurement, strengthen governance and manage contractual risk. • M&A capability: Two acquisitions completed within twelve months demonstrate a repeatable M&A capability that requires dedicated executive focus on origination, due diligence and integration. • Procurement optimisation: Coordinated procurement across business units presents a significant opportunity to improve margins and supply chain resilience as the Company scales. • Leadership team completion: This appointment substantially completes the organisational realignment communicated during the recent investor roadshow, with the senior leadership team now in place to deliver across all three strategic pillars. This announcement has been authorised for release by the Board of Directors. FOR MORE INFORMATION, PLEASE CONTACT: Andrew Rowe Managing Director Mayfield Group Holdings Limited T: +61 8 8169 1070 ASX:MYG | mayfieldgroup.com.au About Mayfield Group Holdings Mayfield Group Holdings Limited (ASX: MYG) designs, manufactures and services the critical electrical infrastructure that forms the foundation for Australia's energy systems, data centres, defence installations and essential industrial operations. While the world embraces new technologies, such as solar farms, data centres, electric vehicles, and AI computing, Mayfield builds the fundamental electrical infrastructure that makes them work. Our business is built on a simple truth: nothing happens without power, and power requires reliable, intelligent distribution systems. We don't just participate in Australia's progress; we provide the essential infrastructure foundation that enables it. Operating from advanced manufacturing facilities in Adelaide (26,500m²) and Perth (7,900m²), with service operations across all mainland state capitals, Mayfield delivers integrated solutions through three complementary business units: Mayfield Industries (modular electrical manufacturing), BE Switchcraft (commercial electrical solutions), and Power Parameters (critical power equipment and testing), supported by ATI Australia's communications and control systems capabilities. Our Australian manufacturing provides supply chain security and rapid response capabilities, positioning Mayfield as an experienced and trusted partner that delivers for major contractors, utilities, infrastructure operators, and government entities. For more information, visit: www.mayfieldgroup.com.au