AAB accelerates growth in Ireland with O’Connor Pyne deal

Leading professional services firm, AAB, has invested in O’Connor Pyne & Co, a Munster-based firm of chartered accountants employing 65 people. The firm is led by three senior partners: Conor Pyne, Tomas O’Connor and Oriel Lawton.

Through a deal with Ormsby & Rhodes, one of Ireland’s longest-established accountancy firms in January 2025, AAB achieved €120m annual revenue. The O’Connor Pyne deal boosts AAB’s business in Ireland to €20m, employing more than 200 people.

As part of its expansion in the Munster region, it is intended that AAB’s office will be a flagship building located in the Ballincollig area. The move will reflect the firm’s long-term commitment to investing in regional capability, talent and client service.

Founded more than 20 years ago, O’Connor Pyne & Co has built a strong reputation for delivering a broad range of professional services to clients across Ireland. O’Connor Pyne & Co also has long–standing links with Munster Technological University, with graduates forming a core part of its well–established graduate programme. AAB plans to scale its Munster operations significantly over the coming two years through a combination of organic growth and selective acquisitions.

Emma Lancaster, Chief Executive of AAB, said:“Bringing O’Connor Pyne into AAB is an important milestone in the continued development of our business in Ireland. O’Connor Pyne is a highly respected firm with a strong client focus and a culture that closely aligns with our own. This investment allows us to build scale in Munster while broadening the services and specialist expertise available to clients in the region.”

Tomás O’Connor , Founding Partner of O’Connor Pyne & Co, said:“This is a very positive step for our clients and our people. Joining AAB gives us access to a broader range of expertise, technology and investment while allowing us to continue delivering the close, partner-led service that has defined O’Connor Pyne for more than two decades. We see this as a platform for long-term growth in Munster and beyond.”

AAB now employs over 1,200 people across 18 locations. AAB’s scale, ambition and momentum reflect a business that is strongly positioned for its next chapter of expansion with the backing of Goldman Sachs Alternatives.