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Due Diligence Services Companies in Bristol: Providers Overview

Bristol’s business market has grown steadily across technology, aerospace, manufacturing and investor-backed companies, bringing increased demand for specialist due diligence support. Whether linked to acquisitions, investment activity or strategic partnerships, due diligence is often a critical part of understanding financial exposure, operational risks and wider governance considerations before decisions are made.

The firms operating in this area vary considerably in size and focus. Some specialise in transaction and financial due diligence, while others provide broader risk, regulatory and advisory support alongside corporate finance services.

This guide highlights a selection of due diligence services companies operating in Bristol. Rather than ranking providers, the aim is to offer practical context around the types of firms in the market, the organisations they typically support and the areas where their expertise is most relevant.

Acumon

Acumon is a UK firm of chartered accountants and advisors providing due diligence services to companies, investors and corporate groups across Bristol and the wider UK market.

The firm works with organisations ranging from owner-managed businesses through to larger corporate groups and internationally active organisations. Due diligence engagements are structured to support acquisitions, disposals, investment transactions and corporate restructurings, while helping clients assess financial, operational and commercial risks.

Acumon provides financial, tax and commercial due diligence support across a range of transaction structures and reporting environments. Work is delivered using a structured analytical approach tailored to the scope, complexity and objectives of each engagement.

In addition to its UK statutory audit registration, Acumon also maintains audit licences in the Cayman Islands, British Virgin Islands (BVI), Jersey and Isle of Man. These registrations support transactions involving cross-border structures, offshore entities and international reporting requirements.

Corporate transactions frequently involve coordination between management teams, investors, lenders and professional advisers across multiple entities and jurisdictions. Acumon supports organisations through transaction processes by providing analysis, reporting insight and financial due diligence support throughout the engagement lifecycle.

Due Diligence Capabilities

Acumon provides due diligence services across a wide range of transaction structures and organisational environments.

These include:

  • UK limited companies and corporate groups
  • business acquisitions and disposals
  • management buy-outs and buy-ins (MBO/MBI)
  • corporate restructurings and demergers
  • investment and funding transactions
  • cross-border and international group structures
  • owner-managed businesses and corporate groups

Engagements are typically led by senior professionals with direct involvement throughout the transaction process.

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 support engagements involving both UK entities and international group structures.

Core Services

Alongside transaction advisory work, Acumon provides a broader range of services supporting reporting, governance and organisational oversight.

These include:

  • statutory external audit
  • group and subsidiary audits
  • Public Interest Entity (PIE) audits
  • charity and not-for-profit audit
  • financial reporting and governance support
  • financial and tax due diligence
  • internal audit and governance reviews
  • risk management and compliance support
  • business advisory and transaction support

Transaction engagements often involve reviewing reporting reliability, operational performance, commercial assumptions and areas of financial or regulatory exposure.

As organisations expand, restructure or pursue investment opportunities, the complexity of financial reporting, governance and transaction oversight can increase significantly.

Acumon works with businesses that are:

  • preparing for statutory audit requirements
  • acquiring or disposing of businesses
  • seeking investment or funding support
  • operating within group structures
  • assessing financial and operational risks
  • managing cross-border reporting requirements

Early-stage due diligence support can help organisations evaluate transaction risks, improve decision-making visibility and strengthen planning throughout the investment or acquisition process.

Contact Information:

Grant Thornton

Grant Thornton provides due diligence and transaction advisory support for businesses involved in sales processes, acquisitions and investment activity. Their vendor due diligence offering is focused on helping companies prepare for transactions by identifying financial and operational issues early in the process, while also reducing disruption during negotiations with potential buyers.

The firm approaches due diligence as part of a broader advisory process connected to deal management, risk assessment and transaction support. Their teams work alongside company management and external advisers to review value drivers, control issues and financial reporting considerations that may influence deal outcomes or investor confidence.

Key Highlights:

  • Vendor due diligence and transaction advisory support
  • Experience supporting business sales and investment processes
  • Focus on risk identification and value-related issues
  • Support for management teams during transaction preparation
  • Access to wider advisory and international network resources
  • Involvement in financial, governance and operational review processes

Services:

  • Vendor due diligence
  • Sell-side advisory
  • Transaction advisory
  • Risk and financial analysis
  • Completion support
  • Governance and control reviews
  • Forensic and investigations support
  • Restructuring advisory

Contact Information:

  • Website: www.grantthornton.co.uk
  • LinkedIn: www.linkedin.com/company/grant-thornton-uk
  • Instagram: www.instagram.com/gt_trainees
  • Address: 2 Glass Wharf, Bristol, BS2 0EL
  • Phone: +44 (0)11 7305 7600

BDO

BDO provides transaction services and due diligence support for businesses, investors and private equity firms involved in mergers, acquisitions, fundraising and restructuring activity. Their Bristol presence forms part of a wider UK advisory network supporting mid-market and large corporate transactions across multiple sectors.

The scope of their due diligence work covers financial, operational, commercial and technology-related reviews. Different projects are tailored around the transaction itself, with teams examining areas such as earnings quality, operational performance, ESG considerations, tax exposure and systems infrastructure. Alongside transaction support, the firm is also involved in valuation work, post-deal integration and sale and purchase agreement advisory.

Key Highlights:

  • Due diligence support across acquisitions and investment activity
  • Experience working with private equity, corporates and lenders
  • Financial, commercial and operational review capabilities
  • Technology and ESG due diligence support
  • Transaction advisory linked to wider corporate finance services
  • Sector-focused approach across mid-market transactions

Services:

  • Financial due diligence
  • Commercial due diligence
  • ESG due diligence
  • IT and digital due diligence
  • Operational due diligence
  • Tax due diligence and structuring
  • Valuation advisory
  • Bid support and defence
  • Post-transaction review support
  • SPA advisory

Contact Information:

  • Website: www.bdo.co.uk
  • LinkedIn: www.linkedin.com/company/bdo-llp
  • Instagram: www.instagram.com/bdo_uk
  • Address: Bridgewater House, Finzels Reach, Counterslip, Bristol, BS1 6BX, United Kingdom
  • Phone: 0117 930 1500

S&W

S&W advises businesses and investors on financial due diligence during acquisitions, refinancing projects and wider corporate transactions. Their approach is built around tailored reviews that focus on the areas most relevant to the deal, including financial performance, liabilities, working capital and transaction risk.

A large part of their work involves helping clients understand how a business is performing beneath headline figures. Reviews often cover earnings sustainability, cash flow, tax exposure, completion mechanics and control environments, alongside support connected to SPA negotiations and vendor preparation exercises.

Key Highlights:

  • Financial due diligence linked to transactions and refinancing
  • Tailored review scope based on transaction priorities
  • Analysis of earnings, liabilities and working capital
  • Support for vendor due diligence and bid processes
  • Transaction-focused tax and SPA advisory
  • International reach through wider advisory network

Services:

  • Financial due diligence
  • Vendor due diligence
  • Vendor assistance
  • SPA advisory
  • Completion accounts support
  • Tax due diligence
  • Tax structuring
  • Financial investigations
  • Exit studies
  • Value driver analysis
  • Financial modelling

Contact Information:

  • Website: www.swgroup.com
  • Twitter: x.com/S_W_Group
  • LinkedIn: www.linkedin.com/company/swgroupuk
  • Address: EQ Building, 111 Victoria Street, Bristol BS1 6AX
  • Phone: +44 117 233 2200

Bishop Fleming

Bishop Fleming supports private equity firms and portfolio businesses through a combination of transaction, tax and advisory services. Their due diligence work is connected closely to investment activity, including buy-side reviews, platform acquisitions and portfolio expansion projects.

The firm’s transaction teams focus on reviewing financial risks, historic performance and forecast assumptions while also supporting negotiations linked to deal structures and completion arrangements. Alongside due diligence, they provide broader corporate finance and governance-related support for businesses moving through different stages of growth or investment.

Key Highlights:

  • Due diligence support for private equity transactions
  • Buy-side transaction advisory services
  • Reviews tailored to transaction risk and structure
  • Support for portfolio and buy-and-build strategies
  • Tax and transaction advisory capabilities
  • Corporate finance and governance support

Services:

  • Financial due diligence
  • Tax due diligence
  • Transaction services
  • SPA advisory
  • Tax structuring
  • Corporate finance advisory
  • Valuation support
  • Internal audit and risk assurance
  • Forensic accounting
  • Funding advisory

Contact Information:

  • Website: www.bishopfleming.co.uk
  • Facebook: www.facebook.com/100093464198343
  • Twitter: x.com/BishopFlemingUK
  • LinkedIn: www.linkedin.com/company/bishop-fleming-chartered-accountants
  • Instagram: www.instagram.com/bishopfleminguk
  • Address: 10 Temple Back, Bristol, BS1 6FL
  • Phone: 0117 9100250

FRP Advisory

FRP Advisory provides lender-focused due diligence and financial review services connected to financing decisions, restructuring situations and acquisition activity. Their work is commonly linked to helping lenders assess borrower performance, debt capacity and financial risks before funding decisions are made.

Many of their projects involve independent business reviews, cashflow analysis and covenant assessments designed to give lenders clearer visibility into operational stability and financial resilience. The firm also supports transactions where businesses are experiencing pressure around liquidity, refinancing or growth funding requirements.

Key Highlights:

  • Lender due diligence and financial review support
  • Independent business review capabilities
  • Focus on risk assessment and lending decisions
  • Cashflow and debt structure analysis
  • Experience supporting restructuring and financing activity
  • Governance and financial advisory services

Services:

  • Lender due diligence
  • Independent business reviews
  • Cashflow management support
  • Financial analysis
  • Covenant review
  • Financial modelling
  • Governance advisory
  • Valuation services
  • Board and C-suite advisory
  • ESG advisory

Contact Information:

  • Website: www.frpadvisory.com
  • Email: bristol@frpadvisory.com
  • Address: Kings Orchard, 1 Queen Street, Bristol, BS2 0HQ
  • Phone: +44 (0)117 203 3700

Harbourside Corporate Finance

Harbourside Corporate Finance is a Bristol-based advisory practice involved in business sales, acquisitions and succession planning projects. Their due diligence support forms part of a wider corporate finance offering focused on owner-managed businesses and transaction-related decision making.

The firm becomes involved at different stages of the deal process depending on client requirements. Some projects focus on due diligence investigations and valuation work, while others involve support around mergers, management buy-outs or strategic planning linked to ownership transitions.

Key Highlights:

  • Bristol-based corporate finance advisory firm
  • Due diligence support for acquisitions and sales
  • Experience with owner-managed businesses
  • Involvement in succession and exit planning
  • Transaction support across different deal stages
  • Valuation and financial modelling capabilities

Services:

  • Due diligence investigations
  • Business acquisitions support
  • Business sale advisory
  • Strategic merger support
  • Management buy-out advisory
  • Business valuations
  • Financial modelling
  • Succession planning

Contact Information:

  • Website: harboursidecf.co.uk
  • Email: info@harboursidecf.co.uk
  • Facebook: www.facebook.com/Harbourside-Corporate-Finance-105183295323951
  • Twitter: x.com/HarboursideCF
  • LinkedIn: www.linkedin.com/company/harbourside-corporate-finance
  • Address: Freshford House, Redcliffe Way, Bristol, BS1 6NL
  • Phone: 0117 233 8800

Opus Business Advisory Group

Opus Business Advisory Group operates across several UK locations, including Bristol, and provides forensic accounting, restructuring and advisory services connected to financial disputes, investigations and business recovery matters. Their work often overlaps with transactions and financially sensitive situations where independent analysis is required.

The group’s advisory capabilities include support around governance concerns, financial investigations and regulatory matters. Due diligence-related work may form part of wider forensic reviews or restructuring engagements involving investors, creditors or legal advisers.

Key Highlights:

  • Bristol office within wider UK advisory network
  • Forensic accounting and investigations experience
  • Involvement in restructuring and recovery matters
  • Financial analysis linked to disputes and governance issues
  • FCA-regulated advisory group
  • Multi-office UK presence

Services:

  • Forensic accounting
  • Financial investigations
  • Governance advisory
  • Business restructuring support
  • Regulatory advisory
  • Dispute-related financial analysis
  • Risk assessment
  • Advisory services

Contact Information:

  • Website: opusllp.com
  • Email: bristolenquiry@opusllp.com
  • Facebook: www.facebook.com/opusbusinessadvisorygroup
  • Twitter: x.com/opus_llp
  • LinkedIn: www.linkedin.com/company/opus-advisory-group-uk
  • Address: Sixth Floor, Broad Quay House, Prince Street, Bristol, BS1 4DJ, United Kingdom
  • Phone: +44 (0) 117 428 8700

Forvis Mazars

Forvis Mazars provides financial due diligence and transaction advisory services for businesses involved in acquisitions, investment activity and wider corporate transactions. The firm supports clients across different sectors, including private equity, infrastructure, financial services and technology, with reviews focused on financial performance, working capital, debt exposure and transaction risks.

A noticeable part of their approach is the flexibility around scope and deal requirements. Some engagements involve full financial reviews across historical and projected performance, while others focus on specific risks connected to pricing, cash flow assumptions or post-deal planning. Their teams also support vendor due diligence and post-transaction integration matters linked to business transformation and operational change.

Key Highlights:

  • Financial due diligence for acquisitions and investments
  • Sector coverage across private equity, infrastructure and technology
  • Flexible review scope based on transaction requirements
  • Assessment of working capital, debt and cash flow risks
  • Vendor due diligence support
  • International advisory network and multi-office UK presence

Services:

  • Financial due diligence
  • Vendor due diligence
  • Third-party due diligence
  • Transaction advisory
  • Risk assessment
  • Post-deal transformation support
  • Financial analysis
  • Crisis and disputes advisory
  • Restructuring support

Contact Information:

  • Website: www.forvismazars.com
  • Facebook: www.facebook.com/ForvisMazarsGroup
  • Twitter: x.com/ForvisMazarsUK
  • LinkedIn: www.linkedin.com/company/forvis-mazars-in-the-uk
  • Instagram: www.instagram.com/forvismazarsuk
  • Address: 8th Floor, Assembly C, Cheese Lane, Bristol, BS2 0JJ, United Kingdom
  • Phone: +44 (0) 117 928 1700

SLR Consulting

SLR Consulting provides transaction due diligence services with a strong focus on environmental, technical and sustainability-related risks linked to investments and acquisitions. Their projects are often connected to infrastructure, real estate, energy, telecoms and industrial sectors where operational and environmental exposure can have a direct impact on transactions.

A large part of the firm’s due diligence work involves reviewing assets, sites and projects before investment decisions are made. This can include ESG assessments, environmental liabilities, engineering reviews and property-related investigations connected to acquisitions, financing or portfolio management activity.

Key Highlights:

  • Environmental and technical due diligence support
  • Experience across infrastructure, energy and real estate sectors
  • ESG-focused transaction advisory capabilities
  • Support for acquisitions, financing and investment reviews
  • International project and advisory experience
  • Sector-specific risk assessment approach

Services:

  • Transaction due diligence
  • Environmental due diligence
  • ESG assessments
  • Technical due diligence
  • Property-related investigations
  • Risk analysis
  • Sustainability advisory
  • Engineering assessments
  • Site and asset reviews

Contact Information:

  • Website: www.slrconsulting.com
  • LinkedIn: www.linkedin.com/company/slr-consulting
  • Instagram: www.instagram.com/slr_europe
  • Address: 3rd Floor, Brew House, Jacob Street, Tower Hill, Bristol, BS2 0EQ
  • Phone: +44 (0) 330 088 6631

Saffery

Saffery provides financial due diligence support for businesses involved in acquisitions, investment activity and corporate transactions. The firm focuses on financial performance reviews, risk assessment and analysis of earnings, working capital and debt-related exposures linked to potential deals.

The transaction services team handles assignments across different sectors and tailors reviews around the structure and complexity of the transaction itself. Sustainability and ESG considerations are becoming a larger part of this process as well, particularly where long-term operational resilience or reporting obligations may affect investment decisions.

Key Highlights:

  • Financial due diligence for transactions and acquisitions
  • Review of earnings quality and working capital
  • Risk assessment and compliance review support
  • ESG and sustainability due diligence capabilities
  • Sector-focused transaction advisory approach
  • Support across different stages of the deal process

Services:

  • Financial due diligence
  • Risk assessment
  • Cash flow analysis
  • Compliance review
  • ESG due diligence
  • Vendor due diligence
  • Transaction advisory
  • Valuation support
  • Sustainability reporting review

Contact Information:

  • Website: www.saffery.com
  • Email: info@saffery.com
  • LinkedIn: www.linkedin.com/company/saffery
  • Instagram: www.instagram.com/saffery_uk
  • Address: St Catherine’s Court, Berkeley Place, Clifton, Bristol BS8 1BQ, UK
  • Phone: +44 (0)117 915 1617

EY

EY delivers due diligence services across large and mid-market transactions, supporting organisations involved in mergers, acquisitions, investments and strategic growth activity. The scope of their work extends across financial, operational, commercial, tax and technology-related areas linked to transaction decision-making.

One area that stands out is the breadth of specialist reviews available within a single transaction process. Depending on the deal, assessments may include cybersecurity, AI systems, sustainability exposure, workforce matters or operational performance alongside traditional financial diligence. The firm positions these reviews as part of wider transaction and corporate finance advisory support.

Key Highlights:

  • Multi-disciplinary due diligence capabilities
  • Support for mergers, acquisitions and investment projects
  • Financial, operational and technology-focused reviews
  • AI, cyber and sustainability due diligence services
  • Corporate finance and transaction advisory support
  • International transaction experience

Services:

  • Financial due diligence
  • Commercial due diligence
  • Operational due diligence
  • IT due diligence
  • Cybersecurity due diligence
  • AI due diligence
  • Sustainability due diligence
  • Human resources due diligence
  • Transaction tax advisory

Contact Information:

  • Website: www.ey.com
  • Facebook: www.facebook.com/pages/Ernst-Young/195665063800329
  • Twitter: x.com/EYnews
  • LinkedIn: www.linkedin.com/company/1073
  • Address: The Paragon, Counterslip, Bristol BS1 6BX
  • Phone: +44 117 981 2050

RSM UK

RSM UK focuses part of its due diligence offering on regulatory risk and compliance reviews, particularly within financial services transactions. Their reviews are designed to help organisations understand authorisation requirements, governance structures and compliance controls before completing mergers, acquisitions or investment activity.

The firm examines areas such as oversight frameworks, internal controls, technology use and risk management structures to identify issues that could affect regulatory exposure or long-term commercial stability. This type of due diligence is often relevant where regulated entities or financial services businesses are involved in the transaction.

Key Highlights:

  • Regulatory due diligence for financial services transactions
  • Focus on governance and compliance frameworks
  • Review of risk management and control environments
  • Assessment of regulatory authorisation requirements
  • Internal audit and risk assurance capabilities
  • Financial services sector expertise

Services:

  • Regulatory due diligence
  • Risk assurance
  • Governance review
  • Compliance assessment
  • Internal controls review
  • Risk management analysis
  • Technology and systems review
  • Internal audit support

Contact Information:

  • Website: www.rsmuk.com
  • LinkedIn: www.linkedin.com/company/rsm-uk
  • Instagram: www.instagram.com/rsm.uk
  • Address: 2nd Floor, 1 The Square, Temple Quay, Bristol, BS1 6DG
  • Phone: 44 (0)117 945 2000

PKF Francis Clark

PKF Francis Clark provides due diligence and transaction support for buyers, vendors and investors involved in acquisitions, disposals and investment projects. The firm approaches due diligence as a practical review process that looks at commercial risks, financial reporting issues and operational considerations linked to a deal.

Part of their process includes detailed financial analysis supported by tax specialists and data analytics teams. Reviews are tailored around the transaction itself and may cover areas such as tax exposure, completion risks, integration planning and post-deal recommendations. Their Bristol office supports businesses across the South West and wider UK market.

Key Highlights:

  • Buy-side and vendor due diligence support
  • Transaction advisory for investors and businesses
  • Financial and tax-focused deal reviews
  • Data analytics and reporting support
  • Practical post-deal planning considerations
  • Bristol-based corporate finance presence

Services:

  • Financial due diligence
  • Vendor due diligence
  • Buy-side due diligence
  • Tax due diligence
  • Transaction support
  • Data analytics
  • Post-deal advisory
  • Risk assessment
  • Completion support
  • Tax structuring

Contact Information:

  • Website: pkf-francisclark.co.uk
  • Email: contact@pkf-francisclark.co.uk
  • Facebook: www.facebook.com/PKFFrancisClark
  • LinkedIn: www.linkedin.com/company/francis-clark-chartered-accountants
  • Instagram: www.instagram.com/pkffrancisclark
  • Address: 90 Victoria Street Bristol BS1 6DP
  • Phone: 01174 039800

Conclusion

Choosing a due diligence provider in Bristol often depends on the type of transaction involved, the level of financial or operational risk, and the kind of insight a business or investor needs before moving forward. Some firms focus mainly on financial and tax diligence, while others bring experience in areas such as regulatory review, ESG, technology risk or lender advisory.

The Bristol market includes a mix of national advisory firms, specialist corporate finance practices and sector-focused consultancies. Each brings a slightly different approach depending on the complexity of the deal, the industry involved and the scope of the review required.

This guide highlights a selection of due diligence services companies operating in and around Bristol to provide general context on the market and the types of support available across different transaction scenarios.