Helping financial services firms
grow with confidence and control

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How we champion
your business

We help financial services businesses navigate complex regulations, reduce risk and grow with confidence.

With tailored advice and practical support, we guide you through challenges, unlock opportunities and help you make smart decisions for long-term success.

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4 Reasons to Choose Sumer

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Stay compliant with confidence:

Expert guidance on FCA rules, CASS and regulatory reporting.

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Structure your firm for growth:

Support that helps you build tax-efficient, regulation-ready business models.

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Improve margin control:

Practical insight into services, clients and costs to boost performance.

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Plan your next move:

Succession strategies for valuations, retirement and partner exits.

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Discover how we help financial services businesses thrive.

Meet the team

Gilles Siow

London
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Gilles Siow

With more than 20 years’ experience, I work with entrepreneurial businesses across sectors including financial services, manufacturing, hospitality and technology. My client base covers small, large and international entities, reporting under UK GAAP and IFRS. I specialise in statutory audits and I also work on non-audit assignments and advisory matters. I am heavily involved in the management of the audit department and on technical matters.

There are plenty of ways Sumer can make a
difference to your business.

But if we had to pick one, it’s our people. With partner-led services from local experts in every region, we offer national scale and personal
support from people who understand your sector and your community. From succession planning and exits to international growth, our
specialists are here to help you make the big decisions with confidence.

Let's strengthen your
organisation’s financial future.