HaysMac, the award-winning accountancy, tax and advisory firm, has acquired Green Square, a specialist corporate finance advisory firm with an excellent reputation for delivering high-quality M&A advice to founders, management teams and shareholders.
The acquisition strengthens HaysMac’s corporate finance capability and supports its long-term strategy to help ambitious, growth-focused businesses and their owners respond to change, navigate successful transactions, and create long-term value.
Green Square brings more than 20 years’ experience advising on transactions across a wide range of ownership structures, including founder-led and investor-backed businesses. While the firm is well known for its work in the marketing, media and technology sectors, its expertise spans a broad range of cross jurisdiction transactions and commercial environments.
As part of HaysMac, Green Square’s team will offer clients seamless access to strategic corporate finance advice alongside leading Tax, Transaction Services, Audit, Risk Assurance and Private Client Expertise. This integrated approach gives clients a single, joined‑up advisory team to support critical decisions, from early preparation and strategic planning through to transaction execution and longer‑term post‑deal outcomes.
HaysMac has a long‑established reputation for advising ambitious, growing and evolving businesses, building deep expertise across transaction support, tax structuring, due diligence and ongoing advisory services. The addition of Green Square significantly strengthens this capability, representing HaysMac’s in‑house corporate finance expertise and reinforcing the firm’s ability to guide clients through complex transactions and periods of change.
Tony Walford and Barry Dudley, Partners at Green Square, commented: “Green Square has always been focused on helping founders and shareholders make confident decisions at pivotal moments in their lives. Joining HaysMac allows us to build on that purpose, working as part of a larger advisory firm that shares our commitment to quality, relationships and long–term outcomes. Together, we can support more businesses across a wider range of situations, with the depth and breadth of expertise that clients increasingly value.”
Jon Dawson, Partner and Head of Sectors and Markets at HaysMac, said: “Bringing Green Square into the firm broadens the advice we can offer ambitious businesses and investors. It embeds dedicated transaction expertise within HaysMac and enhances how we support founders, leadership teams and stakeholders across a wider range of situations and growth stages.”
Natasha Frangos, Managing Partner at HaysMac, said: “This acquisition is an important milestone for HaysMac and achieves our strategic ambition to deepen our transaction advisory capabilities. We have known and worked with the team at Green Square for many years and so I know our culture and values are aligned. Green Square has an outstanding reputation for supporting owners and shareholders through complex, high–value transactions, and their expertise perfectly complements our existing strength in advising growth focused and investor backed businesses.
Bringing Green Square into the firm builds on what we already do best: combining rigorous thinking with a genuinely people‑centred approach. This bolsters our capability so we can support stronger outcomes and long‑term value for our clients and their stakeholders. It underpins our purpose at HaysMac – For Business. For People. For Good. – and how we support clients through meaningful, long‑term decisions.”
This announcement follows an exceptional 12 months for HaysMac. Most recently, the firm was named ‘DEI Champion of the Year’ at the Lloyds British Business Excellence Awards, recognised for the second consecutive year as one of The Sunday Times ‘Best Places to Work 2025 – Big Organisation’, and highly commended in the ‘Best Places to Work for Women’ category. These achievements build on HaysMac’s inclusion in eprivateclient’s ‘Top Accountancy Firms’ for 2025, ranking the leading UK tax advisory firms serving domestic and international private clients, their businesses, and families.
In January 2026, HaysMac celebrated its 25th anniversary, marking a quarter century of delivering exceptional service, fostering talent, and making a lasting impact across the business and social purpose community. This milestone year also saw the acquisition of Moore DM’s US Tax team, strengthening the firm’s international tax compliance offering and enhancing its Private Client Tax team to provide seamless cross-border support for entrepreneurs, business owners, and high net worth individuals.
