Insights

Growing Leadership Recent promotions of multiple professionals to Partner level demonstrate Simmons Gainsford’s commitment to expanding leadership capacity, indicating potential for increased service offerings and more strategic account management opportunities.

Mergers & Acquisitions The acquisition of Defriesweiss and strategic partnership with Riordan O’Sullivan & Co suggest a focus on expanding geographic reach and service expertise, providing opportunities to cross-sell advisory, tax, and consultancy services to a broader client base.

Market Expansion The firm’s focus on inward investment from Asian and Eastern European markets, along with multilingual teams, positions them well to attract international clients seeking UK market entry, creating potential for specialized corporate advisory and currency risk management solutions.

Technological Investment Utilization of advanced tech stack tools such as HubSpot Analytics, Google Cloud, and Cookiebot indicates a data-driven approach to client engagement and operational efficiency, opening opportunities to offer digital transformation and automation services.

Client Demographics Serving a diverse range of clients from start-ups to companies with over £100 million in turnover, Simmons Gainsford presents opportunities to tailor high-value consulting, tax planning, and growth strategy services to different segments of successful, privately-owned businesses.

Simmons Gainsford, part of the Sumer Group Tech Stack

Simmons Gainsford, part of the Sumer Group uses 8 technology products and services including HubSpot Analytics, Cookiebot, Google Cloud, and more. Explore Simmons Gainsford, part of the Sumer Group's tech stack below.

  • HubSpot Analytics
    Analytics
  • Cookiebot
    Cookie Compliance
  • Google Cloud
    Infrastructure As A Service
  • jQuery
    Javascript Libraries
  • HubSpot
    Marketing Automation
  • Piwik
    System Analytics & Monitoring
  • ZURB Foundation
    UI Frameworks
  • WP-PageNavi
    Web Platform Extensions

Media & News

Simmons Gainsford, part of the Sumer Group's Email Address Formats

Simmons Gainsford, part of the Sumer Group uses at least 1 format(s):
Simmons Gainsford, part of the Sumer Group Email FormatsExamplePercentage
First.Last@sgllp.co.ukJohn.Doe@sgllp.co.uk
49%
First.Middle@sgllp.co.ukJohn.Michael@sgllp.co.uk
1%
First.L@sgllp.co.ukJohn.D@sgllp.co.uk
1%
First.Last@sgllp.co.ukJohn.Doe@sgllp.co.uk
49%

Frequently Asked Questions

Where is Simmons Gainsford, part of the Sumer Group's headquarters located?

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Simmons Gainsford, part of the Sumer Group's main headquarters is located at 14th Floor, 33 Cavendish Square, London, W1G 0PW, GB. The company has employees across 2 continents, including EuropeNorth America.

What is Simmons Gainsford, part of the Sumer Group's phone number?

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You can contact Simmons Gainsford, part of the Sumer Group's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Simmons Gainsford, part of the Sumer Group's official website and social media links?

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Simmons Gainsford, part of the Sumer Group's official website is sgllp.co.uk and has social profiles on LinkedIn.

What is Simmons Gainsford, part of the Sumer Group's NAICS code?

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Simmons Gainsford, part of the Sumer Group's NAICS code is 5412 - Accounting, Tax Preparation, Bookkeeping, and Payroll Services.

How many employees does Simmons Gainsford, part of the Sumer Group have currently?

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As of October 2025, Simmons Gainsford, part of the Sumer Group has approximately 148 employees across 2 continents, including EuropeNorth America. Key team members include Partner: A. H.Partner/Member: J. D.Associate Partner: L. D.. Explore Simmons Gainsford, part of the Sumer Group's employee directory with LeadIQ.

What industry does Simmons Gainsford, part of the Sumer Group belong to?

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Simmons Gainsford, part of the Sumer Group operates in the Accounting industry.

What technology does Simmons Gainsford, part of the Sumer Group use?

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Simmons Gainsford, part of the Sumer Group's tech stack includes HubSpot AnalyticsCookiebotGoogle CloudjQueryHubSpotPiwikZURB FoundationWP-PageNavi.

What is Simmons Gainsford, part of the Sumer Group's email format?

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Simmons Gainsford, part of the Sumer Group's email format typically follows the pattern of First.Last@sgllp.co.uk. Find more Simmons Gainsford, part of the Sumer Group email formats with LeadIQ.

When was Simmons Gainsford, part of the Sumer Group founded?

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Simmons Gainsford, part of the Sumer Group was founded in 1948.
Simmons Gainsford, part of the Sumer Group

Simmons Gainsford, part of the Sumer Group

AccountingUnited Kingdom51-200 Employees

Simmons Gainsford is a multi-disciplinary firm of chartered accountants and business advisers. The firm was established in 1948 and currently has 25 Partners and Associate Partners and over 150 staff.  Our main office is in Central London, with additional offices in North London, Sussex, and Gibraltar. Our core client group consists of successful, privately-owned businesses ranging from start-ups to businesses with turnover in excess of £100m. Over the years we have helped many of these clients to grow nationally and internationally.

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). It is a top 15 UK accountancy practice consisting of over 2,500 people across more than 50 UK offices.

A key focus of our business is inward investment to the UK, especially from the emerging Asian and Eastern European markets. Our multilingual Partners and team members have strong links in these jurisdictions and are ideally placed to help businesses seeking to trade in and with the UK.

We also have extensive experience in dealing with the personal taxation affairs of foreign nationals residing or working in the UK. And, with our Gibraltar office, we are perfectly placed to advise UK nationals looking to establish residence in Gibraltar.

Beyond accountancy, audit, and tax, we regularly advise clients on broader business requirements. Within the group we have several businesses that provide specialist expertise in the areas of Capital Allowances, Credit Management, Financial Services, Insurance, and Procurement.

Section iconCompany Overview

Headquarters
14th Floor, 33 Cavendish Square, London, W1G 0PW, GB
Phone number
NAICS Code
5412 - Accounting, Tax Preparation, Bookkeeping, and Payroll Services
Founded
1948
Employees
51-200

Section iconFunding & Financials

  • $10M$25M

    Simmons Gainsford, part of the Sumer Group's revenue is estimated to be in the range of $10M$25M

Section iconFunding & Financials

  • $10M$25M

    Simmons Gainsford, part of the Sumer Group's revenue is estimated to be in the range of $10M$25M

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