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CASS 6 Audit Companies in Leeds 2026: A Practical Guide

Choosing a CASS 6 audit provider in Leeds is more than just ticking a regulatory box — it can make a real difference to how confidently your firm handles client assets and meets FCA expectations.

Leeds has a solid selection of audit companies that work with investment firms and other regulated businesses on custody asset rules. This overview looks at some of the active providers in the area, the kind of support they offer, and the approaches they take, so you can find the right fit for your needs without it feeling like a strict ranking.

Acumon

Acumon is a London-based firm of chartered accountants and registered auditors providing CASS audit services for FCA-regulated investment firms. The company specialises in CASS five, CASS six and CASS seven audits focused on client money and custody asset compliance under the Client Assets Sourcebook rules. Acumon holds ICAEW registration and FRC authorisation for public interest entity audits, supporting its work on regulated financial services engagements.

Acumon delivers structured CASS audit processes that include planning, systems and controls review, testing of reconciliations and segregation arrangements, and final reporting to the FCA. The firm integrates CASS work within its broader audit, risk and advisory offerings, helping finance teams and boards strengthen governance and internal controls around client asset handling. This approach applies to investment firms while maintaining alignment with FCA expectations and UK regulatory standards.

Audit Capabilities

Acumon provides CASS audit services across FCA-regulated firms and related structures.

These include:

  • Investment firms holding client money and custody assets
  • Firms subject to CASS five, six and seven requirements
  • Regulated entities requiring reasonable or limited assurance reports
  • Financial services businesses with complex client asset arrangements

Audit engagements are typically led by senior audit professionals with direct involvement throughout the engagement.

Regulatory Licences and Registrations

Acumon holds several audit registrations that enable it to support organisations operating across multiple jurisdictions.

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 allow the firm to provide audit services to groups that include entities in both the UK and key international financial centres.

Core Services

In addition to statutory external audit, Acumon provides a range of services that support financial reporting and governance.

These include:

  • statutory external audit
  • group and subsidiary audits
  • Public Interest Entity (PIE) audits
  • charity and not-for-profit audit
  • audit of international group structures
  • internal audit and governance reviews
  • risk management and compliance support

Audit work is often delivered alongside discussions with management and boards regarding financial reporting processes and governance frameworks.

Many organisations initially encounter statutory audit requirements as they grow and exceed the audit exemption thresholds set out in the Companies Act.

Acumon works with businesses that are:

  • approaching their first statutory audit
  • preparing for external investment
  • expanding into international markets
  • operating within corporate group structures

Early engagement with an audit firm can help ensure that financial reporting systems and documentation are aligned with statutory audit requirements.

Contact Information:

Sedulo Audit Limited

Sedulo Audit Limited delivers CASS audit support to regulated firms that handle client money and assets under FCA rules. The company examines compliance procedures, client asset controls, and related systems to help businesses meet regulatory expectations. Their process involves understanding how firms operate before assessing records, reconciliations, and internal arrangements in detail.

Sedulo Audit Limited maintains offices in multiple UK locations including Leeds which allows them to serve local clients effectively. The firm also covers other assurance areas such as grant audits and solicitors accounts rules reviews. Experienced professionals provide practical input during engagements while focusing on efficient delivery that fits around business operations. This structure helps firms navigate complex CASS obligations with structured reviews and clear documentation.

Key Highlights:

  • Focus on regulated financial services businesses
  • Offices across the UK including Leeds
  • Experience with client asset compliance reviews
  • Support for various types of assurance engagements

Services:

  • Strategic planning support
  • Client assets CASS work
  • Statutory audit
  • Credit union audits
  • Pensions audits
  • Compliance reviews

Contact Information:

  • Website: sedulo.co.uk
  • Address: St. Paul’s House, 23 Park Square, Leeds, LS1 2ND
  • Phone: 0333 222 4445
  • E-mail: hello@sedulo.co.uk
  • LinkedIn: www.linkedin.com/company/sedulo
  • Twitter: x.com/sedulo_group
  • Facebook: www.facebook.com/SeduloGroup
  • Instagram: www.instagram.com/sedulogroup

PKF Littlejohn

PKF Littlejohn offers CASS audit services as part of their work with wealth and asset management firms. The company assists with preparation for audits by reviewing risk and controls matrices, resolution packs, policies, and breach registers. Their guidance covers early planning, internal training, and updates to procedures that support compliance with CASS rules.

PKF Littlejohn operates from a Leeds office alongside other UK locations and provides specialist input on client asset requirements. The firm works with investment firms and related entities on assurance engagements that address both reasonable and limited assurance needs. Their approach emphasises timely communication and practical steps to meet FCA reporting deadlines within the required four-month window after year end.

Key Highlights:

  • Specialist funds and asset management focus
  • Guidance on CASS preparation and common requirements
  • Support for breach register maintenance
  • Experience with resolution pack reviews

Services:

  • Audit and assurance
  • Internal audit
  • IT assurance
  • Risk and controls assessment
  • CASS health checks

Contact Information:

  • Website: www.pkf-l.com
  • Phone: 0113 244 5141
  • E-mail: akonieczko@pkf-l.com
  • LinkedIn: www.linkedin.com/company/littlejohn
  • Twitter: x.com/PKF_Littlejohn
  • Instagram: www.instagram.com/pkf.littlejohn

Grant Thornton

Grant Thornton provides support around CASS compliance through insights, webinars, and audit services for firms handling client assets. The company shares practical recommendations on maintaining systems and controls in growing operations. Their team discusses common challenges and helps firms prepare for regulatory reviews in the client assets area.

Grant Thornton has a presence in Leeds and works across financial services sectors including wealth management and investment firms. The firm delivers assurance engagements that align with FCA expectations for client money and custody assets. Partners and directors contribute expertise on both audit and advisory matters related to CASS obligations.

Key Highlights:

  • Focus on small and medium sized firms
  • Regular insights on CASS rules and preparation
  • Webinars covering compliance topics

Services:

  • Limited assurance reviews
  • Internal audit support
  • Statutory audit
  • CASS audit
  • Advisory services

Contact Information:

  • Website: www.grantthornton.co.uk
  • Address: 7th Floor, City Square House, 11 Wellington Street, Leeds, LS1 4DL
  • Phone: +44 (0)113 245 5514
  • E-mail: dan.j.dickinson@uk.gt.com
  • LinkedIn: www.linkedin.com/company/grant-thornton-uk
  • Instagram: www.instagram.com/gt_trainees

Saffery

Saffery carries out CASS audits for FCA regulated firms that hold or control client money and assets. The company clearly sets out the difference between reasonable assurance and limited assurance engagements. They also explain the deadlines for reports and what needs to go into them, while checking systems, controls and procedures to help firms stay in line with the Client Assets Sourcebook rules.

The agency gives straightforward advice on which firms actually need a CASS audit and what can happen if things are not done properly. The firm works with financial services businesses and professional practices, bringing practical knowledge of the rules and how they work in real life. Their style mixes the technical side with everyday application, so it makes sense for companies of different sizes.

Key Highlights:

  • Details on reporting deadlines
  • Clear explanations of assurance report types
  • Guidance on who needs CASS audits
  • Practical view of systems and controls

Services:

  • Regulatory compliance advice
  • Client asset reviews
  • CASS assurance engagements
  • Audit services

Contact Information:

  • Website: www.saffery.com
  • Address: 10 Wellington Place, Leeds, LS1 4AP, UK
  • Phone: +44 (0)113 887 5538
  • E-mail: info@saffery.com
  • LinkedIn: www.linkedin.com/company/saffery
  • Instagram: www.instagram.com/saffery_uk

Forvis Mazars

Forvis Mazars provides audit and assurance services to firms in the financial services sector. The company supports organisations with regulatory requirements through its audit work and has a presence in Leeds among other UK locations. Their approach covers a range of assurance engagements for businesses operating under various regulatory frameworks.

Forvis Mazars delivers services across multiple industries with particular experience in financial services, banking and insurance. The firm combines audit capabilities with advisory support to help organisations manage compliance and governance matters. This setup allows them to work with entities that face complex regulatory obligations in client asset handling and related areas.

Key Highlights:

  • Strong presence in financial services sector
  • Audit and assurance focus for regulated firms
  • Offices including Leeds
  • Integration of audit with advisory services
  • Support for governance and compliance work

Services:

  • Consulting
  • Sustainability advisory
  • Audit and assurance
  • Tax services
  • Financial advisory

Contact Information:

  • Website: www.forvismazars.com
  • Address: 5th Floor, 3 Wellington Place, Leeds, LS1 4AP, United Kingdom
  • Phone: +44 (0) 113 394 2000
  • LinkedIn: www.linkedin.com/company/forvis-mazars-in-the-uk
  • Twitter: x.com/ForvisMazarsUK
  • Facebook: www.facebook.com/ForvisMazarsGroup
  • Instagram: www.instagram.com/ForvisMazarsGroup

KPMG

KPMG offers CASS compliance support and advisory services to regulated financial services firms. The company helps with understanding CASS rules, embedding controls, and preparing for regulatory scrutiny including thematic reviews and health checks. Their work includes CASS change projects, transformation programmes and support for payment and e-money firms under new safeguarding requirements.

They assist with CASS operating model improvements, training, and readiness for FCA visits. The firm runs industry forums and webinars on current CASS topics such as CASS fifteen implementation. This practical focus covers core assurance activities, remediation, and ongoing monitoring of client asset arrangements.

Key Highlights:

  • CASS health checks and RP reviews
  • Specialist CASS advisory and assurance support
  • Experience with CASS transformation projects
  • Support for payment and e-money firms
  • Training and forum events on regulatory developments

Services:

  • Technology solutions
  • Financial crime risk management
  • Audit services
  • Risk consulting
  • Regulatory compliance advisory

Contact Information:

  • Website: kpmg.com
  • Address: 1 Sovereign Square, Sovereign Street, Leeds, LS1 4DA
  • Phone: +44 (0)113 231 3000
  • LinkedIn: www.linkedin.com/company/kpmg-uk
  • Twitter: x.com/kpmguk
  • Facebook: www.facebook.com/KPMG

Deloitte

Deloitte provides CASS Risk Advisory services to financial institutions. The company supports firms with interpretation of CASS rules, development of control environments, and oversight arrangements including SMF mentoring. Their collaborative approach includes full scope assessments, ad-hoc advice, training, and remediation of audit findings.

Deloitte works on business and regulatory change projects related to client assets while maintaining a focus on practical application of the rules. The firm helps strengthen CASS controls and prepare for external scrutiny through targeted advisory engagements.

Key Highlights:

  • Remediation and training services
  • Advice on regulatory visits and changes
  • Dedicated CASS Risk Advisory team
  • Support for CASS control environment assessments
  • SMF and oversight mentoring

Services:

  • Risk advisory
  • Audit services
  • Consulting
  • Regulatory compliance support

Contact Information:

  • Website: www.deloitte.com
  • Address: 1 City Square, Leeds, LS1 2AL, United Kingdom
  • Phone: +44 (0)113 243 9021
  • E-mail: Globalprandeminence@deloitte.com
  • LinkedIn: www.linkedin.com/company/deloitte
  • Twitter: x.com/deloitte
  • Facebook: www.facebook.com/deloitte
  • Instagram: www.instagram.com/deloitte

EY

EY provides assurance services that include audit and technology risk work for regulated firms. The company looks at risk and complexity in financial reporting and controls. They combine audit work with advisory support in areas like sustainability, forensics and financial accounting. EY also pays attention to how technology and data affect compliance processes.

The company operates across different sectors and helps organisations with regulatory and reporting requirements. Their team delivers assurance engagements that use analytics and specialist input. This helps build confidence in how businesses manage their controls and obligations. Their work supports firms that need to demonstrate solid governance around client assets and financial oversight.

Key Highlights:

  • Work across regulated sectors
  • Analytics-driven assurance services
  • Broad assurance and audit capabilities
  • Technology risk and controls focus
  • Support for financial reporting and governance

Services:

  • Financial accounting advisory
  • Forensic and integrity services
  • Audit services
  • Climate change and sustainability services
  • Technology risk services

Contact Information:

  • Website: www.ey.com
  • Address: 12 Wellington Place, Leeds LS1 4AP
  • Phone: +44 113 298 2200
  • LinkedIn: www.linkedin.com/company/ernstandyoung
  • Twitter: x.com/EYnews
  • Facebook: www.facebook.com/EY

Conclusion

Choosing the right CASS 6 audit company in Leeds comes down to how well they understand your business and fit into your day-to-day operations. Some firms are more technical, while others offer a straightforward, practical approach that suits busy teams.

Ultimately, a good auditor does more than just meet FCA requirements — they help you identify issues early and strengthen your controls. Take time to speak with a few of the providers mentioned, ask about their experience with similar firms, and see which one feels like the best fit.