The team you trust, now with even more to offer
Riordan O’Sullivan & Co is now a part of Simmons Gainsford
What’s happening?
We have joined forces
We are pleased to share that Riordan O’Sullivan & Co has joined forces with Simmons Gainsford, a move that brings together two firms with a shared commitment to client service, specialist expertise, and long-standing relationships.
While the name may be changing, the people and service you know remain the same – now with the added benefit of access to a broader network of knowledge and resources.
- Familiar Faces
Your usual contacts at Riordan O’Sullivan & Co are still here and continuing to support you. - Expanded Services
You’ll now also have access to Simmons Gainsford’s full range of services including tax, audit, advisory, outsourced finance, payroll, financial services, and more. - Seamless solutions
This integration enables us to support your needs even more effectively, across every stage of your business or personal financial journey.
About Simmons Gainsford
The Obvious Choice for Quality Advice and Service
First established in 1948, Simmons Gainsford is a multidisciplinary firm of chartered accountants and business advisers. Our main office is in Central London, with additional offices in Sussex and Gibraltar. Our size, structure, and resources enable us to provide the full range of services and technical expertise, but with the personal touch that comes from a high level of partner engagement.
In December 2023, Simmons Gainsford joined the Sumer Group, the UK and Ireland’s leading mid-market accountancy practice delivering professional support to small and medium-sized enterprises (SMEs) across England, Scotland, and Northern Ireland. It is a top 15 UK accountancy practice consisting of over 2,500 people across more than 50 UK offices on a mission to champion SME businesses and offer local delivery supported by national expertise.
What the team says
Our Combined Strength
“We are delighted to welcome Riordan O’Sullivan & Co to our group. Their excellent reputation and strong client relationships perfectly complement our mission to champion SMEs throughout the UK. This merger represents another significant step in our ambitious growth strategy.”
Darren Hersey
Senior Partner of Simmons Gainsford
“Joining Simmons Gainsford marks an exciting new chapter for our firm. Our clients will benefit from enhanced service capabilities while maintaining the hands-on personal relationships we know they expect and value. We’re proud to join an organisation that shares our commitment to supporting SME businesses and the communities they serve.”
Kumar Perumal
Client Director, Simmons Gainsford incorporating Riordan O’Sullivan & Co
You now have access to Simmons Gainsford’s full range of services including:
They said it best
FAQs
Why have Simmons Gainsford, part of the Sumer Group acquired Riordan O’Sullivan & Co?
This partnership brings together two thriving businesses with complementary strengths and a shared purpose and values. Riordan O'Sullivan & Co’s excellent reputation and strong presence in North London enhances the Sumer Group's ability to serve clients across the UK with local expertise backed by national resources.
Will there be any changes to client service teams?
Clients will continue working with the same trusted professionals they know. Riordan O'Sullivan & Co team will remain in place, now with access to additional resources, specialised expertise, and technology to enhance client service.
Will Riordan O’Sullivan & Co be changing its name?
Sumer adopts a regional brand approach and following the deal we have become part of the enlarged regional practice within London. This will mean after a short transition period we will adopt the Simmons Gainsford name.
How does this affect Riordan O’Sullivan & Co's operations?
Day-to-day operations will continue smoothly. The local leadership team remains in place and will continue to operate from its headquarters at: 38-40 Chamberlayne Rd, London NW10 3JE. Over time, clients will benefit from enhanced capabilities and access to specialised services through Sumer Group's national network.
Does this partnership signal further expansion for Simmons Gainsford, part of the Group in London?
Simmons Gainsford is committed to strategic growth in the region. We continue to seek opportunities to enhance our ability to serve SME businesses throughout the country.
How does this merger fit into the Sumer Group's overall strategy?
This partnership aligns perfectly with the Sumer Group's strategy of investing in exceptional firms that share our commitment to championing SME businesses. With backing from Penta Capital and BlackRock, the Sumer Group aims to grow rapidly over the coming years through strategic partnerships with leading regional firms like Riordan O'Sullivan & Co.
Contact us
London Office
Tel: 020 7447 9000
Email:mail@sgllp.co.uk
Uckfield Office
Tel: 01825 746 888
Email:mail@sgllp.co.uk
Gibraltar Office
Tel: +350 2005 9753
Email:mail@sgllp.gi
North London Office
Tel: 020 8969 9411
Email:mail@sgllp.co.uk
or leave us a message using the form