London's M&A market operates at every altitude, but for private companies and their owners the layer that matters is the boutique and mid-market one: independent corporate finance houses that sell owner-managed businesses, sector specialists who know every buyer in their vertical, and firms whose partners handle each mandate personally rather than delegating to juniors.
That layer is unusually rich in the capital - family-owned houses with thirty-year track records, technology-only advisors with international office networks, and sector boutiques covering everything from food and beverage to the energy transition. The right fit depends on sector, deal size and whether your buyer is likely to be domestic or global.
This guide highlights a selection of mergers and acquisitions services companies in London. It is not a ranking - the aim is context: each firm's focus, deal territory and what distinguishes its model.
Acumon
Acumon is a London firm of chartered accountants whose advisory practice covers mergers and acquisitions for owner-managed and mid-market businesses from its London base. The deal services sit together in one team: selling your business, buying a business, management buyouts and buy-ins, demergers, valuations and succession planning - with financial modelling and both commercial and tax due diligence delivered in-house rather than subcontracted.
The firm's angle on M&A is that tax and diligence decide outcomes as much as negotiation does: deal structures are planned before heads of terms, when reliefs such as Business Asset Disposal Relief can still be secured, and due diligence findings are translated directly into price adjustments, warranties and completion mechanics. Because Acumon is also an ICAEW-registered audit practice with 90 UK-based professionals, the evidence discipline behind its transaction work is the same one that survives regulatory inspection.
Key Highlights:
- Partner-led M&A and transaction support for owner-managed and mid-market deals
- Buying, selling, MBO/MBI, demergers and valuations handled in one firm
- Tax due diligence, commercial due diligence and financial modelling in-house
- ICAEW Chartered Accountants with 90 UK-based professionals
- Tax structuring of deals planned before heads of terms, not after
Services:
- Business sale (sell-side) advisory
- Acquisition support and buy-side advisory
- Management buyouts and buy-ins (MBO/MBI)
- Business valuations
- Financial, commercial and tax due diligence
- Company demergers and reorganisations
- Succession and exit planning
Contact Information:
- Website: acumon.com
- E-mail: [email protected]
- Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
- Phone: 020 8567 3451
Corbett Keeling
Corbett Keeling is the classic London boutique: independent, family-owned, based at Angel Court in the City, and founded 30 years ago by Jim Keeling. Its territory is precisely defined - privately-owned UK companies valued between £10 million and £150 million - and its claims are concrete: a 90% deal completion rate and an average 40% uplift in sale value for clients.
The firm is FCA-authorised and covers selling private businesses, raising capital and acquisitions across consumer, financial services, healthcare, industrials, support services and TMT. For owners in its valuation band who want senior attention on a sale that will happen once, the model is built exactly for them.
Key Highlights:
- Family-owned City boutique, 30 years established
- £10m-£150m private company territory
- 90% claimed deal completion rate
- Average 40% claimed uplift in sale value
- FCA authorised and regulated
Services:
- Selling private businesses
- Raising capital
- Acquisition advisory
- Sell-side M&A for owner-managed companies
- Exit preparation for shareholders
- Private equity transaction advice
Contact Information:
- E-mail: [email protected]
- Address: 8 Angel Court, London EC2R 7HP
- Phone: +44 (0)20 7626 6266
Cavendish
Cavendish is the largest firm in this guide: an investment banking and corporate finance house headquartered at Bartholomew Close with offices in Edinburgh, Manchester and Birmingham, serving public and private companies across sectors. Its advisory span runs from M&A sell-side and buy-side through growth equity, debt advisory and IPO advisory.
For listed and pre-IPO companies it adds what boutiques cannot: sponsor, NOMAD and broking services plus PLC strategic advisory. Recent activity highlighted spans technology, defence, and food and drink - and for private companies whose exit might plausibly be a listing rather than a sale, having both routes under one roof matters.
Key Highlights:
- Full-service corporate finance and investment banking
- M&A, growth equity, debt and IPO advisory
- Sponsor, NOMAD and broking for listed companies
- Four UK offices led from London
- Public and private company client base
Services:
- M&A sell-side advisory
- M&A buy-side advisory
- Growth equity
- Debt advisory
- IPO advisory
- PLC strategic advisory
- Sponsor, NOMAD and broking services
- Investment company services
Contact Information:
- E-mail: [email protected]
- Address: 1 Bartholomew Close, London EC1A 7BL
- Phone: +44 (0)20 7908 6000
GP Bullhound
GP Bullhound is London's technology M&A institution: founded in 1999, now spanning 11 offices across the US, UK, Europe and Asia, with over 700 transactions advised and $58 billion in deal value realised. It advises technology innovators and investors on M&A, exits and growth capital across business software and AI, consumer technology and digital services.
The firm's client roster - Strava, Accenture, Apple, Google, NVIDIA, WPP, BlackRock among names shown on its site - signals its position at the premium end of tech advisory, with sector benchmarking and insights published continuously. For UK technology companies whose buyers are global, its network is the product.
Key Highlights:
- 700+ transactions, $58bn deal value realised
- Eleven offices across the US, UK, Europe and Asia
- Business software, AI and consumer tech focus
- Advises both companies and technology investors
- Founded 1999 - a tech M&A institution
Services:
- M&A advisory for technology companies
- Strategic exit advisory
- Growth capital raising
- Capital raising
- Sector benchmarking and insights
- Advisory to technology investors
Contact Information:
Hampleton Partners
Hampleton Partners advises companies with technology at their core from Mayfair, with additional offices in Frankfurt, Stockholm and Warsaw. Its specialisation is granular: seven defined technology verticals - autotech, digital commerce, enterprise software, IT services, healthtech, fintech and insurtech - plus cross-sector coverage of AI, AR/VR, cybersecurity and HR tech.
The firm advises on company sales and sales of significant equity stakes, and publishes sector market reports that map valuations and buyer activity across its verticals - research that doubles as evidence of how closely it tracks each niche. For tech companies seeking European as well as UK buyers, the continental footprint is a genuine differentiator.
Key Highlights:
- Seven defined technology verticals covered
- London, Frankfurt, Stockholm and Warsaw offices
- Published sector valuation research
- Sales of companies and significant equity stakes
- European buyer reach built in
Services:
- M&A advisory for technology companies
- Company sale mandates
- Sale of significant equity stakes
- Corporate finance consulting
- Sector-focused advisory across seven tech verticals
- Technology market research and reports
Contact Information:
- Address: 17 Woodstock Street, London W1C 2AJ
Livingstone Partners
Livingstone Partners is an independent global M&A and debt advisory firm whose London office in Fulham anchors a 14-office international partnership spanning Amsterdam, Chicago, Frankfurt, Hamburg, Los Angeles, Madrid, Milan, Seoul and Stockholm among others. Core services are sell-side and buy-side M&A, debt advisory and special situations.
Sector coverage runs across consumer, energy and infrastructure, healthcare, industrial, and technology and business services, with private equity investors served alongside corporates. For mid-market deals where the logical buyer sits abroad, a genuinely partnered international firm - rather than a loose network - changes execution.
Key Highlights:
- Fourteen international offices in genuine partnership
- Sell-side, buy-side, debt and special situations
- Private equity investors served alongside corporates
- Cross-border execution as standard
- London base in Fulham
Services:
- Sell-side M&A
- Buy-side M&A
- Debt advisory
- Special situations advisory
- Advice to private equity investors
- Cross-border transaction execution
Contact Information:
- Address: 81-83 Fulham High Street, London SW6 3JW
Oghma Partners
Oghma Partners owns a niche and works it deeply: corporate finance advisory to the food, beverage, packaging and consumer industries, from North Audley Street in Mayfair. The record stands at 56 deals and over $2.12 billion in transaction value, delivered by a team of 11 M&A professionals.
Its founding principle - the big investment bank tool kit combined with old-fashioned client focus, applied to smaller-scale transactions - shows in its work with UK and Continental European companies and investors, including carve-outs and sales of owner-operated businesses. Recent transactions span the UK, Italy and Finland.
Key Highlights:
- Food, beverage, packaging and consumer specialism
- 56 deals, $2.12bn+ transaction value
- Carve-out and owner-operated sale experience
- UK and Continental European deal flow
- Team of 11 M&A professionals
Services:
- Acquisition advisory
- Divestment advisory
- Strategy advice
- Carve-out transactions
- Sales of owner-operated businesses
- Cross-border UK/European M&A in food, beverage, packaging and consumer
Contact Information:
- E-mail: [email protected]
- Address: 20 North Audley Street, London W1K 6LX
- Phone: +44 (0)20 3931 9875
Opus Corporate Finance
Opus Corporate Finance, founded in 2006 at Carey Lane in the City, has positioned itself on the energy transition: M&A advisory and growth capital raising for infrastructure, services and technology clients across renewable energy, storage and grid, eMobility, smart cities, industrial decarbonisation and the circular economy.
Most of its transactions are cross-border, involving investors from Europe, North America and Asia, with listed deals spanning biogas, heat networks, battery storage, carbon capture and vertical farming across five European countries. For companies in the sustainable economy, a specialist who already knows the capital is the shortcut.
Key Highlights:
- Energy transition and sustainable economy specialism
- Majority cross-border transactions
- European, North American and Asian investor network
- Deals from battery storage to vertical farming
- City of London base since 2006
Services:
- M&A advisory
- Growth capital raising
- Cross-border transaction advisory
- Renewable energy and storage and grid sector advisory
- eMobility and smart cities sector advisory
- Industrial decarbonisation and circular economy advisory
Contact Information:
- Address: Opus Corporate Finance LLP, 1 Carey Lane, London EC2V 8AE
- Phone: +44 20 7025 3600
MCF Corporate Finance
MCF Corporate Finance is a boutique M&A house at Waterloo Place in St James's, providing sell-side, buy-side and debt advisory with cross-border transactions and strategic advice for private and public companies. The London team of 13 spans partner to analyst level - large enough for full execution, small enough for partner attention.
Client sectors cover business services, consumer, industrials and technology, with 2025-2026 transactions including deals involving Saxdor Yachts, Immerse Education and UPM/Metamark. The firm's scale and positioning suit mid-market companies that want investment-bank process without investment-bank anonymity.
Key Highlights:
- Boutique with full execution capability
- Sell-side, buy-side and debt advisory
- Cross-border transaction experience
- Recent deals across consumer, education and industrials
- St James's base with a 13-person London team
Services:
- M&A advisory
- Sell-side advisory
- Buy-side advisory
- Debt advisory
- Cross-border transactions
- Strategic advice for private and public companies
Contact Information:
- E-mail: [email protected]
- Address: 14 Waterloo Place, London SW1Y 4AR
- Phone: +44 20 7968 2760
Conclusion
In London the M&A question is rarely whether capable advisors exist - it is which specialisation fits. Sector boutiques bring buyer networks generalists cannot match; international partnerships change outcomes when the buyer is abroad; full-service houses matter when an IPO is a live alternative; and the classic City boutiques earn their keep on the once-in-a-lifetime private sale. Deal size bands are real too - most firms here state theirs, and respecting them saves everyone time.
This guide was assembled to make those distinctions visible. Whoever you shortlist, apply the same tests: recent deals that look like yours, the seniority of who will actually run your mandate, a fee structure whose incentives you understand, and - before anything is signed - tax structuring advice, because the difference between a well-structured and poorly-structured exit routinely exceeds every fee on the deal.
