Riordan O'Sullivan & Co

Riordan O’Sullivan & Co has been providing expert accounting and tax solutions to businesses and individuals throughout London and the South East of England for over 50 years. Founded in 1968, we have evolved through the decades to become one of London’s most established accountancy firms. We now offer a wide suite of accounting, tax planning and advisory services to businesses and private clients in search of practical solutions from an experienced team with a refreshingly proactive and hands-on approach. Our client base extends into a wealth of industries. We work with an impressive portfolio of clients in a variety of sectors, from the beginner embarking on their first dream to businesses with turnovers ranging from thousands to hundreds of millions. Many of these firms came to our practice in the 1960s, 1970s and 1980s and have stayed with us ever since – and these businesses are now well into second generation of owners, something that we believe is testament to the quality of the service we offer and the trust that our clients have placed on us. In particular, we never forget that our largest clients were beginners themselves one day. Our reputation is second to none. Our clients regard us not only as their accountants, but as an extension of their own business and personal financial affairs. They value our practical advice, our efforts to find a solution, our flexible and approachable nature; they appreciate our enduring transparency; and they enjoy the reassurance that comes with partnering with one of London’s long established and most trusted accountancy firms.