Isosceles Finance

What Isosceles Finance does

Isosceles Finance Limited is a UK-based professional services firm providing outsourced accounting, fractional CFO/Finance Director, HR, payroll, company secretarial, and M&A advisory services. Founded in 2001 and headquartered in Egham, the firm operates from three UK offices (Egham, Sheffield, London) and employs 51-100 staff. It is a wholly-owned subsidiary of the Dains Group of Companies, a mid-market UK accounting conglomerate.

The company's stated focus is ambitious growth-stage technology businesses; approximately 75% of its 300+ client base is investor-backed, and clients range from early startups through to companies with turnover up to $50 million. Services are sold on a modular, quote-based engagement model — clients can buy discrete components (e.g., bookkeeping only) or assemble an end-to-end outsourced finance function including part-time FD/CFO access and international subsidiary setup support for overseas companies entering the UK. Distribution is direct, with account directors managing enterprise client relationships and the CEO Mike O'Connell sitting on client boards as Group CFO for major accounts.

Revenue is generated entirely through fee-for-service professional engagements; pricing is not publicly disclosed. Marketing is primarily organic — content marketing via blog/case studies and presence on LinkedIn, Twitter and Instagram — supplemented by limited LinkedIn advertising. The technology stack is not proprietary: Isosceles leverages third-party ERP and accounting platforms and positions its value on people, processes, and sector expertise rather than on a software platform. Strategic activity in 2024–2025 has centered on geographic expansion (Sheffield office, Feb 2024), a leadership refresh (Greg Eaton appointed MD, Sept 2024), and a partnership with Northern Gritstone (Jan 2025) to access North of England tech-startup portfolio companies.

Name

Isosceles Finance

Legal name

Isosceles Finance Limited

Website

https://isoscelesfinance.co.uk

Company type

Private

Founded year

2001

Operating status

Operating

Headcount range

51–100 employees

Short description

Isosceles Finance is a UK-based outsourced accounting, fractional CFO, HR, and payroll services firm serving 300+ ambitious growth-stage technology companies. Founded in 2001 and now part of the Dains Group, it operates from three UK offices.

Ownership category

akta.pro rank

Product category

Outsourced Accounting & Financial Advisory

NAICS

Credit Card Issuing (522210)

SIC

Finance Services (6199)

akta.pro primary industry

Accounts Receivable (Invoicing, Cash Application, Deductions) (BPAAAGAB)

Keywords

• Outsourced accounting
• Fractional CFO services
• HR outsourcing
• Payroll processing
• Business exit planning

Headquarters

HQ city

Egham

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Outsourced Accounting Services: Providing comprehensive finance function outsourcing including bookkeeping, management accounts, financial reporting, and controls. Billed as flexible part-time or full-service arrangements tailored to client needs.
2. Fractional CFO / FD Services: Part-time Finance Director and CFO services available on flexible basis - a few days a week, a few days a month, or project-by-project. Provides access to FD-level expertise at fraction of full-time cost.
3. HR Services: Outsourced HR support including payroll processing, employment contracts, employee handbook development, and ongoing day-to-day HR administration.
4. Business Exit Planning / M&A Advisory: Preparing businesses for sale, acting as lead adviser on acquisitions, supporting due diligence processes, and facilitating successful exits. Includes corporate finance and accounting skills blend.
5. Payroll Services: Full payroll service provision including PAYE registration, payroll processing, and compliance management.
6. UK Subsidiary Setup Services: Comprehensive services for overseas companies establishing UK entities including company formation, registered office provision, company secretarial, tax registration (VAT, corporation tax, PAYE), and compliance services.

Go-to-market motion2 records

Distribution channels1 record

Marketing channels6 records

Core offering

Isosceles Finance provides outsourced accounting, bookkeeping, management accounts and financial controls to growing businesses, alongside part-time fractional CFO/Finance Director services. It also offers outsourced HR, payroll, company secretarial, UK subsidiary setup for overseas companies, and M&A/exit advisory tailored primarily to technology companies and startups.

Product overview

Isosceles Finance operates as a modular outsourced accounting and professional services firm offering a suite of interconnected services designed for early-stage and growing technology companies. The core offering comprises Fractional Accounting (bookkeeping and transaction processing), Fractional CFO/FD Services (part-time Finance Director access), HR Services, and Payroll Services. These can be purchased individually or combined into a comprehensive outsourced finance function. Additional specialized modules include Company Secretarial Services, International Expansion Services for UK branch/subsidiary establishment, M&A Advisory for exit preparation and acquisitions, and Financial Forecasting/Business Intelligence dashboards. The service model is designed to scale with client growth, allowing businesses to blend resources as needed without requiring a full in-house team.

Differentiator

Problem solved

Functional benefit

Products and services

• Fractional Accounting Outsourced accounting service covering bookkeeping, purchase and sales ledger management, credit control, payment runs, bank transaction management, and management accounts/reporting for growing technology companies and small businesses.
• Fractional CFO / FD Services Part-time Finance Director and CFO services providing access to senior financial leadership on a flexible, as-needed basis for businesses that cannot afford a full-time executive, delivered a few days a week, a few days a month, or per project.
• Business Exit Planning Preparation-for-exit services covering valuation support, due diligence readiness, identifying buyers beyond the immediate network, and broader M&A advisory to help business owners achieve premium exit outcomes.
• HR Services Outsourced HR support for small and growing businesses, including policy development, employee relations, recruitment support and compliance with UK employment law.
• Payroll Service Full-service payroll processing including PAYE registration, RTI submissions, and pension auto-enrolment management for small businesses and growing companies.
• Company Secretarial Services Company secretarial support including statutory books maintenance, board-level support, AGM management and Companies Act compliance for client companies.
• International Expansion Services Support for overseas companies setting up a UK branch or subsidiary, including UK company formation, registered office provision, HR and tax registration (VAT, corporation tax, PAYE), and ongoing compliance with UK regulations.
• M&A Advisory Corporate finance and M&A advisory services including acquisition support, vendor assistance, valuation work and transaction negotiation for buyer and seller clients.

Quantifiable outcome

• Client grew from <$2M turnover with handful of employees to $40M revenues with ~200 employees over 18-year relationship
• +3 more outcomes

Named customers10 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Partnerships

One partnership is on record.

• Northern GritstonenotableStrategic or Co-development Partner · 20 January 2025Isosceles Finance announced partnership with Northern Gritstone, an investment firm focused on the North of England technology and innovation sector. Partnership announced January 2025, aligning Isosceles with Northern Gritstone's portfolio companies requiring accounting, finance, and HR support.

Scale indicators6 records

Recent moves6 records

Expansion highlights4 records

Direct peers

• FD Centre: UK fractional Finance Director provider serving SMEs with part-time FDs on flexible contracts. Highly comparable in service line (fractional FD), geography (UK), and customer segment (growth-stage SMEs).
• Pilot.com: US-based outsourced bookkeeping, accounting, and CFO services firm focused specifically on technology startups and venture-backed companies. Direct match on target customer (tech companies, investor-backed) and service mix (bookkeeping, fractional CFO, tax).
• The CFO Centre: UK-based provider of part-time / fractional CFO services to SMEs and growth-stage businesses. Directly comparable service offering (fractional CFO/FD), target market (UK SMEs/growth companies), and flexible engagement model.

Regional players

• Haines Watts: UK-wide accountancy group with a strong owner-managed business and SME focus, including outsourced accounting, payroll, HR and advisory services. Comparable service mix and UK-only delivery footprint.
• Gravita: UK-focused accountancy group serving SMEs, startups and scale-ups with accounting, tax, payroll and advisory services. Strong overlap on target segment (UK growth-stage businesses) with a tech / startup vertical.

Broad incumbents

• RSM UK: Mid-tier UK accounting, tax and consulting firm with a tech sector focus and international footprint. Comparable on outsourced finance, HR/payroll, and M&A advisory, but at larger scale and broader verticals.
• Mazars UK: International mid-tier accounting and advisory firm with UK presence serving SMEs through to listed companies. Overlaps on accounting outsourcing, payroll, HR advisory, and transaction services.
• BDO UK: Top-10 UK accounting and advisory network with a dedicated tech sector practice. Overlaps with Isosceles across accounting, tax, HR advisory, and M&A services, but serves larger enterprises and a broader range of verticals.
• Crowe UK: UK accounting and advisory network (part of Crowe Global) with strong SME and owner-managed business practice. Comparable in outsourced accounting, payroll, and growth advisory services.
• Andersens UK: UK member of the Andersen Global accounting network offering accounting, tax, and advisory to SMEs, HNWIs, and owner-managed businesses. Comparable in providing outsourced finance function and advisory to UK growth companies.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/isoscelesfin
• LinkedInlinkedin.com/company/isosceles-finance
• Instagraminstagram.com/isoscelesfinance
• Facebookfacebook.com/IsoscelesFinance

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Isosceles Finance