Internal Audit Outsourcing Companies in Birmingham: A Practical Selection Guide (2026)
AC
Acumon Chartered Accountants·9 min read
This practical guide provides an overview of companies offering internal audit outsourcing services in Birmingham and the surrounding market. Rather than ranking companies, it reviews different organisations based on their expertise, service focus, and the types of clients they support. The companies range from larger organisations with broad audit and advisory capabilities to more specialised specialists focused on specific sectors or assurance needs. The goal is to give readers useful context about each company, its areas of work, and factors that can help with selecting a suitable internal audit partner.
Acumon
Acumon is a UK firm of chartered accountants and registered auditors providing internal audit outsourcing services to organisations that need independent assurance over governance, risk management, and internal controls. The firm supports businesses, charities, and other entities with outsourced and co-sourced internal audit arrangements.
Acumon works with organisations that require structured internal audit support without maintaining all audit capabilities in-house. Its approach includes risk-based audit planning, control reviews, audit testing, reporting, and recommendations designed to support management teams and boards.
The firm provides internal audit services alongside its wider audit, risk, and assurance capabilities. This allows Acumon to support organisations with reviews of financial controls, operational processes, compliance frameworks, and governance arrangements.
Acumon’s internal audit outsourcing services are designed to provide independent insight into business processes and control environments. The firm works with organisations across different sectors, adapting audit assignments to the size, complexity, and specific requirements of each organisation.
Internal audit engagements can support organisations during periods of growth, operational change, regulatory development, or when additional assurance over existing processes is required. Acumon works with management teams to identify control improvements and strengthen governance frameworks.
Through its UK audit and assurance experience, Acumon supports organisations seeking practical internal audit solutions that combine independent review with a clear understanding of financial reporting and risk management requirements.
Audit Capabilities
Acumon provides internal audit outsourcing services across different organisational structures and business environments.
These include:
Outsourced internal audit functions
Co-sourced internal audit support
Risk-based internal audit planning
Internal control reviews
Governance and compliance assessments
Operational and financial process reviews
Internal audit assignments are structured around the organisation’s objectives, risk profile, and existing governance arrangements. Acumon’s professionals provide independent assessments while working closely with management teams and relevant stakeholders.
Regulatory Licences and Registrations
Acumon operates as a regulated UK audit firm with experience supporting organisations that require professional audit and assurance services.
These include:
UK statutory audit registration
Public Interest Entity (PIE) audit licence
Jersey audit licence
Isle of Man audit licence
Cayman Islands audit licence
British Virgin Islands audit licence
These registrations support Acumon’s ability to work with organisations operating across different jurisdictions and complex corporate structures. The firm’s regulatory experience contributes to its understanding of governance, reporting, and control requirements.
Core Services
In addition to internal audit outsourcing, Acumon provides a range of audit, risk, and assurance services that support organisational governance.
These include:
Internal audit outsourcing
Co-sourced internal audit support
Internal control reviews
Risk management assessments
Governance reviews
Compliance support
External audit services
Acumon supports organisations that need additional assurance resources, independent reviews of internal processes, or ongoing support with governance frameworks.
The firm works with businesses and organisations that are:
Expanding operational activities
Reviewing existing internal controls
Preparing for regulatory requirements
Strengthening governance processes
Managing complex organisational structures
Internal audit outsourcing can provide organisations with access to experienced audit professionals while maintaining an independent perspective on risks, controls, and improvement opportunities.
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
Bishop Fleming
Bishop Fleming provides audit, tax, and advisory services from offices across the UK, including Birmingham. Its internal audit offering supports organisations with assurance reviews, governance assessments, risk management, and internal control evaluations.
The firm works with public sector organisations, charities, education providers, and businesses requiring structured assurance support. Its internal audit services can be delivered as outsourced arrangements or alongside existing internal teams.
Key Facts
Ideal for: Organisations needing internal audit and risk assurance support
Core services: Internal audit outsourcing, risk reviews, governance support
Specialization: Assurance and advisory services
Industries: Public sector, charities, education, businesses
Kreston Reeves provides internal audit outsourcing and co-sourcing services for organisations seeking additional assurance capacity. Its internal audit work covers governance, compliance, operational controls, and technology-related risks.
The firm supports organisations that already have internal audit teams as well as those requiring external support. Services include audit planning, control reviews, audit committee support, and specialist assurance assignments.
Key Facts
Ideal for: Organisations requiring flexible internal audit support
Address: 2nd Floor, 168 Shoreditch High Street, London, E1 6RA
Phone: +44 (0)330 124 1399
Twitter: x.com/KrestonReeves
LinkedIn: www.linkedin.com/company/kreston-reeves
BDO
BDO provides audit and advisory services for businesses and organisations across different sectors. Its internal audit services focus on helping organisations review controls, improve risk management processes, and strengthen governance frameworks.
The firm works with organisations requiring independent assurance over operational, financial, and compliance-related areas. Its broader advisory teams allow internal audit work to be combined with other risk and business support services.
Key Facts
Ideal for: Medium-sized and larger organisations requiring structured assurance
Specialization: Business controls and assurance frameworks
Industries: Financial services, public sector, commercial organisations
Location: UK-wide offices
Contact Information
Website: www.bdo.co.uk
Phone: 0121 352 6200
Address: Two Snowhill Birmingham, B4 6GA, United Kingdom
LinkedIn: www.linkedin.com/company/bdo-llp
Instagram: www.instagram.com/bdo_uk
Forvis Mazars
Forvis Mazars provides audit, tax, and advisory services, including internal audit and risk management support. The firm helps organisations assess controls, governance arrangements, and compliance processes.
Its internal audit services cover areas such as risk assessments, internal control reviews, and audit function support. The Birmingham office provides access to wider UK advisory teams.
Key Facts
Ideal for: Organisations needing audit and advisory support
RSM provides audit, tax, and consulting services, including internal audit outsourcing and risk advisory support. Its internal audit teams help organisations evaluate controls, governance processes, and operational risks.
The firm works with businesses and public sector organisations that require independent assurance or additional internal audit resources. Its services include internal audit planning, reviews, and risk management support.
Grant Thornton provides advisory and assurance services, including internal audit support for organisations managing governance, risk, and compliance requirements.
Its internal audit teams work with organisations to assess processes, controls, and risk frameworks. The firm supports businesses and public bodies that require independent insight into their internal control environment.
Key Facts
Ideal for: Larger organisations with complex assurance requirements
Protiviti provides internal audit consulting and outsourcing support for organisations that need additional assurance expertise, risk management support, or help developing their internal audit functions. Its services cover areas such as technology risk, operational controls, compliance, and governance reviews.
The firm works with organisations that require specialist audit knowledge without maintaining all capabilities internally. Its Birmingham-area presence is supported through UK offices, including Solihull, allowing it to support businesses across the West Midlands.
Key Facts
Ideal for: Organisations requiring specialist internal audit and risk support
Location: UK-wide services with West Midlands presence
Contact Information
Website: www.protiviti.com
Phone: +44.12.1616. 4600
Address: Second Floor, AIR, 35 Homer Road, Solihull B91 3QJ, United Kingdom
LinkedIn: www.linkedin.com/company/protiviti
Facebook: www.facebook.com/protiviti
Twitter: x.com/protiviti
Instagram: www.instagram.com/protiviti
S&W
S&W provides audit and advisory services for businesses and organisations across the UK. Its internal audit-related work focuses on reviewing controls, governance processes, financial systems, and operational risks.
The firm supports organisations that need independent reviews of internal processes and assurance over key business areas. Its Birmingham presence allows it to work with companies in the region alongside its wider UK advisory teams.
Key Facts
Ideal for: Businesses needing audit and assurance support
PKF Smith Cooper provides internal audit and advisory services for organisations across the Midlands, including Birmingham. Its work covers internal controls, governance reviews, risk management, and compliance assessments.
The firm combines internal audit support with wider accounting and advisory services, which can be useful for organisations looking for broader financial oversight alongside assurance work.
Key Facts
Ideal for: Midlands-based organisations requiring internal audit support
Sedulo provides audit and advisory services, including internal audit support for organisations reviewing their controls, governance arrangements, and operational processes. The firm works with businesses that require independent assessments or additional audit resources.
Its Birmingham office supports local organisations with accounting, advisory, and assurance requirements. Internal audit work can include reviews of business processes, risk areas, and control environments.
Key Facts
Ideal for: Businesses needing flexible audit support
Address: The Metro Club, 73 Cornwall Street, Birmingham, B3 2DF
LinkedIn: www.linkedin.com/company/sedulo
Facebook: www.facebook.com/SeduloGroup
Twitter: x.com/sedulo_group
Instagram: www.instagram.com/sedulogroup
KPMG
KPMG provides internal audit outsourcing and co-sourcing services for organisations that require additional risk, controls, and compliance expertise. Its internal audit teams support organisations with assurance programmes, control reviews, and risk management assessments.
The firm works with organisations across multiple industries and provides access to specialist teams covering areas such as technology risk, regulatory requirements, and operational assurance.
Key Facts
Ideal for: Large organisations with complex audit requirements
Specialization: Enterprise risk and specialist assurance
Industries: Financial services, public sector, multinational organisations
Location: UK-wide offices
Contact Information
Website: kpmg.com
Phone: +44 (0)121 232 3000
Address: One Snowhill, Snowhill Queensway, B4 6GH
LinkedIn: www.linkedin.com/company/kpmg-uk
Twitter: x.com/kpmguk
Facebook: www.facebook.com/KPMG
Conclusion
This guide highlights a selection of internal audit outsourcing services providers available to organisations in Birmingham and across the UK. The right choice depends on factors such as sector experience, audit requirements, preferred delivery model, and the level of specialist support needed.
Some organisations require a fully outsourced internal audit function, while others need targeted reviews or additional capacity for an existing team. Comparing service scope, governance experience, and assurance capabilities can help organisations identify a provider that matches their internal audit needs.
AC
Written by the Acumon team
Acumon is an ICAEW-registered firm of chartered accountants and registered auditors
based in London, with offices in Pitstone, Aylesbury and Bournemouth. Need advice on
anything covered here? Talk to us.
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