Boutique M&A Companies in London: 92 Active Firms (2026)
Boutique M&A companies in London advise smaller and mid-market business sales, acquisitions and capital events across the city.
Buying usually starts with owner-managers, finance directors and boards rather than procurement teams, with private investors and corporate development desks appearing on buy-side mandates. The London cohort skews towards specialist advisory teams handling preparation, valuation, negotiation and execution for founder-owned and mid-market situations. Engagements tend to be bespoke projects, often combining an upfront retainer with a completion-linked fee, so relationship access and sector focus matter more than platform scale. The typical client wants a controlled process, a defensible valuation and credible buyer access, not a broad investment-banking bench.
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London has 92 actively trading boutique M&A companies matching this profile, a small cohort by advisory-market standards and one that appears more capacity-constrained than technology-led. Reported headcount totals 535, which fits the operating model: partner-led origination, small execution teams and variable external support around diligence, legal work and tax. Only 8 companies report more than £5M in revenue, so the visible scale tier is narrow; most firms appear closer to owner-managed professional services than institutional investment banks. A further 9 were incorporated since 2022, suggesting some new formation without changing the overall small-firm shape.
Regulatory exposure depends on the activity, not the label on the mandate. Plain company-sale advice, valuation work and negotiation support can look different from arranging investments, distributing securities or handling client money, so boutique advisers tend to draw careful boundaries around scope, disclaimers and referrals. London also creates a dense referral market: accountants, lawyers, lenders and private investors can originate work, but the same network raises conflict-management expectations. For researchers, the practical market-structure point is that apparent size can understate influence, because a lean adviser may still control access to a narrow buyer universe.
The sector appears likely to remain fragmented, with reputation, sector focus and partner networks doing much of the work that scale performs in larger advisory houses. Newer firms can enter with limited infrastructure, but credibility takes longer to build because mandates depend on trust, buyer access and evidence of completed processes. Consolidation may occur where succession, compliance costs or cross-border buyer reach create pressure on very small teams. Even so, the cohort tends to reward independence: founder-shareholders often prefer advisers who look close to the deal rather than distant from it.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
92
Active firms
2026
8
Revenue above £5M
Companies
9
Incorporated since 2022
Companies
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Key facts
About 8% of the trading cohort reports turnover above £5M (8 of 92 firms) — the rest sits below that revenue band.
9% of the cohort was incorporated since 2022 (9 firms), so a sizeable share is in its first few filing cycles.
Boutique M&A advisers tend to sit between accountancy-led corporate finance teams and larger investment banks, with mandates centred on business sales, acquisitions, management buyouts and capital events.
London demand is shaped by owner-managed exits, private-equity bolt-ons, sector-specialist acquisition searches and capital events for companies below bulge-bracket attention.
Relationship-led origination and sector familiarity matter in smaller and mid-market transactions where formal auction processes are less common.
Procurement often starts from existing adviser and referral networks rather than open supplier searches, which can make category mapping untidy.
Top London Boutique M&A companies
Provides corporate finance advisory services to owner‑managed and mid‑market businesses, including mergers and acquisitions advice, sale processes, and capital raising. Supports companies in finding…
Serves shareholders, founders and management teams of owner-managed SMEs and lower-mid-market businesses, especially media, events, business information and digital media firms seeking buyers,…
Financial Health
N/AN/A
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Financial sub-scores
Computed from 5 filingsProvides corporate finance advisory services to lower and mid‑market businesses, advising on company sales, acquisitions and investment transactions. Supports deal processes including buyer or…
Serves lower to mid-market businesses, owner-managers and management teams seeking corporate transactions, typically involving £5m-£75m deal values, across multiple sectors.
Financial Health
StrongStrong · Hiring · 36% CAGR over 4y
Location
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Computed from 5 filingsProvides corporate finance advisory services to entrepreneurs, management teams and investors. Advises on raising debt and equity capital, mergers and acquisitions, share sales, and business exits,…
Serves entrepreneurs, management teams and investors globally, across all industry sectors, typically involved in corporate transactions or growth strategies with deal sizes of £10m-£300m.
Financial Health
StableStable · 0% CAGR over 5y
Location
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Computed from 2 filingsProvides corporate finance and M&A advisory services to SME and lower mid‑market founder‑led businesses, including advising on company sales, raising growth equity, and structuring strategic or…
Serves founders and owners of SME and lower mid-market, founder-led businesses valued at £10m-£250m, particularly those preparing for exits, growth capital or strategic transactions.
Financial Health
StrongStrong · Hiring · 167% CAGR over 1y
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Computed from 4 filingsProvides mergers and acquisitions advisory services to mid‑market businesses and private equity investors. Supports sell‑side and buy‑side transactions, capital raising, and strategic growth…
Serves mid-market businesses, private equity investors, strategic buyers and financial sponsors across tech and services, education, financial institutions, healthcare, media and events, and…
Financial Health
StrongStrong · Hiring · 59% CAGR over 3y
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Computed from 5 filingsProvides investment banking and financial advisory services, including mergers and acquisitions advisory, capital raising, business sales and acquisitions, business valuations and fairness opinions,…
Serves entrepreneurs, business owners and shareholders in the lower middle market, plus buyers and investors, across aerospace, business services, consumer/retail, healthcare, energy, manufacturing,…
Financial Health
HealthyHealthy · Hiring · 6% CAGR over 4y
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Computed from 5 filingsProvides mergers and acquisitions advisory services to company founders and management teams. Advises on sales, acquisitions and strategic transactions for mid‑market businesses, particularly…
Serves company founders and management teams pursuing M&A, typically at tech-enabled services, SaaS and services businesses with £5m-£75m enterprise value, headquartered in the UK, EMEA or AsiaPac.
Financial Health
WeakWeak · -3% CAGR over 6y
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Computed from 5 filingsProvides corporate finance advisory services including business sales, mergers and acquisitions, capital raising through debt or equity, management buyouts and buy-ins, and debt restructuring,…
Serves business owners, management teams and companies, typically valued up to £100m, involved in private equity-backed transactions, acquisitions, capital raises or restructurings, alongside UK and…
Financial Health
StableStable
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Provides independent corporate finance advisory services to entrepreneurs, business owners and management teams, including fundraising, debt advisory, business sales, acquisitions, management buyouts…
Serves entrepreneurs, business owners and management teams in consumer sectors, including brands, e-commerce, leisure and retail, as well as renewable energy, offshore energy services, environmental…
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Computed from 4 filingsProvides mergers and acquisitions advisory services to technology and services companies. Advises on buy-side and sell-side transactions, focusing on fintech, HR technology, workforce solutions, and…
Serves B2B companies, founders, shareholders and acquirers in FinTech, HRTech, workforce solutions and ESG, including software, staffing, recruitment, payroll, sustainability data and carbon…
Financial Health
WeakWeak · 0% CAGR over 3y
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Computed from 2 filingsProvides investment banking and corporate finance advisory services including mergers and acquisitions support, business valuation, strategic planning, capital structuring, and transaction advisory…
Serves business owners, private companies and investors pursuing acquisitions, exits, roll-up strategies or valuation needs, including clients in sectors such as medical staffing and steel.
Financial Health
WeakWeak
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Computed from 3 filingsProvides corporate finance advisory services for small to mid-cap transactions, including mergers and acquisitions, divestments, capital raising, debt financing, and business valuations. Advises…
Targets corporate companies, financial investors and business owners involved in small to mid-cap transactions, including owners of family businesses and firms seeking capital, buyers or exits.
Financial Health
WeakWeak · -11% CAGR over 2y
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Computed from 5 filingsProvides mergers and acquisitions advisory services, business sales and acquisitions support, and valuation for companies in the print, packaging, labelling and plastics sectors, including targeted…
Serves business owners, shareholders and corporate acquirers in the printing, packaging, labelling, plastics injection moulding and allied sectors.
Financial Health
StableStable · -4% CAGR over 4y
Location
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Computed from 5 filingsProvides mergers and acquisitions advisory services to business owners and companies, including sell-side and buy-side support, target identification and evaluation, transaction negotiation and due…
Sells to business owners, founders, investors, and corporate acquirers seeking support with selling, buying, or growing companies. Serves businesses needing fundraising advice, transaction support,…
Financial Health
StrongStrong · Hiring · 41% CAGR over 4y
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Provides mergers and acquisitions advisory services, supporting company owners and managers with sell-side and buy-side transactions, company valuations, buyer or target identification, and deal…
Serves owners, managers, investors and shareholders of mid-sized companies, including family businesses and senior executive teams pursuing company sales, acquisitions, growth or transformation.
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Computed from 5 filingsProvides growth and M&A advisory to creative, technology, digital and media companies. Supports business expansion, fundraising, acquisitions and company sales, and advises founders and management…
Serves founders, owners and leadership teams at creative, tech, digital and media companies, including agencies and consultancies considering growth, investment, acquisitions or sale.
Financial Health
StableStable · 0% CAGR over 4y
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Computed from 5 filingsProvides corporate finance and M&A advisory services, including debt and equity fundraising, acquisitions, trade sales and management buyouts. Advises companies on securing investment, structuring…
Targets UK business owners, founders and management teams at growth companies, including firms scaling operations, entering new markets, pursuing acquisitions or planning private equity, trade sale…
Financial Health
StrongStrong · Growing, Hiring · 6% CAGR over 4y
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Computed from 3 filingsProvides corporate finance advisory services to private business owners, including business sales and acquisitions, succession through employee ownership trusts, raising investment, and managing…
Serves owners and shareholders of successful private businesses, typically seeking company sales, succession via employee ownership trusts, investment or growth support, across multiple sectors in…
Financial Health
HealthyHealthy · -6% CAGR over 2y
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Computed from 2 filingsProvides strategic mergers and acquisitions advisory to founders and business owners, focusing on mid‑market private equity transactions. Advises on company sales, exits to private equity investors,…
Sells to founders and CEOs of mid-market businesses, typically valued at £20m-£200m, who are considering a private equity or strategic sale. Targets business owners across the UK and Europe involved…
Financial Health
StrongStrong
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Computed from 5 filingsProvides mergers and acquisitions advisory services, including buy‑side and sell‑side transaction support, capital raising, business sales, acquisitions, and strategic advice on ownership…
Serves business owners, founders and management teams, plus private equity investors, considering company sales, acquisitions, investment raises or succession planning.
Financial Health
HealthyHealthy · -61% CAGR over 4y
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Computed from 5 filingsProvides corporate finance advisory services to private company owners, including business sales, capital raising and acquisitions. Advises on transactions, identifies buyers and investors, and…
Serves owners of privately owned UK companies valued £10m-£150m, particularly in consumer, financial services, healthcare, industrials, support services and tech/media/telecoms.
Financial Health
StrongStrong · Growing, Hiring · 12% CAGR over 4y
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Computed from 5 filingsProvides corporate finance advisory services including mergers and acquisitions, divestments and strategic advice. Works with food, beverage, packaging and consumer sector companies and investors on…
Serves UK and Continental European food, beverage, packaging and broader consumer companies, their shareholders and investors, typically involved in smaller-scale M&A and strategic transactions.
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
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Computed from 3 filingsProvides corporate finance advisory services focused on financial services, financial technology and professional services companies. Advises on mergers and acquisitions, buy‑side and sell‑side…
Serves B2B clients across Europe: financial services, professional services and fintech companies, as well as private equity investors, entrepreneurs, boards and shareholders.
Financial Health
HealthyHealthy · Hiring · 41% CAGR over 2y
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Computed from 3 filingsProvides financial and strategic advisory services on technology sector transactions, including mergers and acquisitions. Advises founders and shareholders on deal structuring, negotiations and…
Serves founders and shareholders of technology businesses across the UK, Europe and the US, particularly in SaaS, AI, data centres, industrial IoT, marketplaces, PropTech, hardware, machinery and…
Financial Health
WeakWeak · 0% CAGR over 2y
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Computed from 2 filingsProvides corporate finance and mergers and acquisitions advisory services for companies in the consumer sector. Advises corporates, entrepreneurs and financial sponsors on sell‑side and buy‑side…
Serves corporates, entrepreneurs and financial sponsors in the global consumer sector, including food and beverage, leisure and hospitality, health, beauty and wellness, agriculture, ingredients and…
Financial Health
StrongStrong · -5% CAGR over 1y
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Computed from 5 filingsProvides mergers and acquisitions and strategic advisory services to healthcare businesses. Advises founders and operators on company sales, acquisitions, mergers, and growth strategy, supporting…
Serves founders, shareholders and operators of UK and European healthcare SMEs, including clinics, diagnostic imaging, NHS insourcing, MSK and diagnostics providers.
Financial Health
HealthyHealthy · Hiring · 5% CAGR over 4y
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Provides mergers and acquisitions advisory and strategic growth support to founder‑led businesses, including sell‑side exit planning, buyer outreach, capital raising, and investment partnerships to…
Serves founder-led businesses, founders and business owners seeking growth capital, strategic support or exits, plus buyers and investors pursuing acquisitions in SaaS, fintech, manufacturing,…
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Provides corporate finance advisory services including mergers and acquisitions, divestments, and strategic advice to companies and investors in the food, beverage, packaging, and consumer goods…
Serves UK and Continental European food, beverage, packaging and broader consumer companies and investors, including owner-operated businesses, shareholders and corporate buyers.
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Computed from 4 filingsAdvises owners of IT, technology and telecommunications companies on business sales and mergers and acquisitions. Provides buyer sourcing, fundraising support, reverse due diligence, and transaction…
Serves owners and shareholders of IT, technology and telecoms businesses, especially MSPs and communications providers, seeking a sale, fundraising or transaction preparation, plus buyers active in…
Financial Health
WeakWeak · -6% CAGR over 3y
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Computed from 3 filingsProvides corporate finance and M&A advisory services focused on energy technology, energy infrastructure and e‑mobility. Advises companies and investors on acquisitions and disposals, capital…
Serves corporates, entrepreneurs, management teams, boards, investment funds and infrastructure owners in climate tech, energy technology, energy infrastructure, e-mobility and transport…
Financial Health
WeakWeak · Hiring · 29% CAGR over 2y
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Provides investment banking and financial advisory services, including sell-side and buy-side mergers and acquisitions advisory, capital raising, infrastructure finance, and fairness opinions for…
Serves founders, family-owned businesses, entrepreneurs, and public or private middle-market companies in healthcare, technology, industrials, business services, financial services, and consumer…
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Provides corporate finance and strategic advisory services including mergers and acquisitions, acquisitions support, and growth planning. Works with creative, technology, digital and media companies…
Serves owners and leadership teams of creative, tech, digital and media businesses, including agencies and communications consultancies, seeking growth, finance, acquisitions or sale options.
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Computed from 5 filingsProvides corporate finance advisory services, helping businesses raise growth capital, secure debt financing, arrange asset finance, and execute mergers and acquisitions including business sales,…
Serves SMEs, corporates and owner-managed businesses, especially firms with £1m+ EBITDA seeking growth funding, debt options, asset finance, acquisitions, management buyouts or shareholder exits.
Financial Health
StableStable · Hiring · 3% CAGR over 4y
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Computed from 2 filingsProvides financial advisory and deal origination services, including sourcing debt and equity investors, structuring and arranging financing, and executing acquisitions and divestments. Also invests…
Serves strategic and financial buyers, investors and asset owners involved in small and mid-cap transactions across power and utilities, renewables, real estate and technology.
Financial Health
DistressedDistressed
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Computed from 5 filingsProvides corporate finance advisory services to IT, telecoms and technology companies, including mergers and acquisitions advice, business sale support, growth strategy planning, due diligence and…
Targets founders, owners and management teams of IT, telecoms and technology businesses, including firms preparing for exit, growth plans, mergers, acquisitions or transaction due diligence.
Financial Health
WeakWeak
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Computed from 5 filingsProvides mergers and acquisitions and corporate finance advisory services to technology-focused companies. Advises on the sale of businesses and equity stakes, growth capital transactions, and sector…
Sells to technology-focused businesses seeking M&A, sale, or growth capital advice, including companies and investors in autotech, digital commerce, enterprise software, IT services, healthtech,…
Financial Health
DistressedDistressed · -46% CAGR over 4y
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Computed from 5 filingsProvides corporate finance advisory services to owner‑managed businesses, including advising on selling and acquiring companies, raising finance, and structuring management buyouts and employee…
Serves B2B owner-managed businesses and owner-managers across the UK, particularly shareholders and management teams planning acquisitions, company sales, growth funding, management buyouts or…
Financial Health
WeakWeak · Hiring · 7% CAGR over 4y
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Computed from 4 filingsProvides mergers and acquisitions advisory services, focusing on the events and exhibitions sector. Advises founders and companies on selling businesses, running sale processes, identifying buyers,…
Serves founders, owners and corporate shareholders in the exhibitions, conferences, events and specialist media sectors, alongside trade buyers pursuing acquisitions in those markets.
Financial Health
StrongStrong
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Computed from 3 filingsProvides corporate finance and investment banking advisory services, including mergers and acquisitions, strategic transactions, and capital raising. Advises founders, corporates, and private equity…
Serves founders, corporate management teams and private equity investors, particularly in consumer, retail, media, digital media and technology sectors.
Financial Health
WeakWeak · -6% CAGR over 2y
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Computed from 3 filingsProvides corporate finance advisory services including mergers and acquisitions execution, capital raising, acquisition target identification and strategic advice to corporates, private equity…
Serves public and private corporates, private equity and venture capital investors, founders and entrepreneurs pursuing European deals, particularly in technology, healthcare, cleantech/greentech and…
Financial Health
DistressedDistressed · 0% CAGR over 2y
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Provides mergers and acquisitions advisory and corporate finance services to mid‑market companies and investors. Advises on business sales, acquisitions, capital raising and debt financing across…
Serves mid-market business owners, management teams and investors across sectors including technology, healthcare, consumer, industrials, financial services, real estate and transport, with an…
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Computed from 2 filingsProvides mergers and acquisitions advisory services to media and creative industry companies, particularly TV production, kids’ IP, advertising and marketing businesses. Advises owners on company…
Serves business owners and founders in the media sector, especially TV production, kids IP, advertising, marketing and creative services companies seeking sale, investment or fundraising transactions.
Financial Health
StrongStrong · Growing · 0% CAGR over 1y
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Provides independent corporate finance advisory to companies and investors in the energy and environmental services sector, including advice on business sales, acquisitions, fundraising, debt…
Serves corporate clients, financial investors and entrepreneurs in the energy and environmental services sector, including energy services, logistics, consultancy, engineering, transport…
Financial Health
N/AN/A
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Computed from 3 filingsProvides investment banking advisory services to technology companies, including strategic advice, private fundraising for growth and secondary capital, and sell-side mergers and acquisitions support…
Serves entrepreneurs and leadership teams at technology businesses, particularly growth companies and innovators seeking private capital, secondary funding or sell-side transactions.
Financial Health
HealthyHealthy · -86% CAGR over 2y
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Computed from 5 filingsProvides investment banking services focused on technology companies, including mergers and acquisitions advisory, capital raising, and strategic growth advice. Advises software, fintech, IoT and…
Serves B2B technology companies and their owners, executives and investors, including software, IT services, fintech, IoT, cyber, SaaS and digital transformation firms.
Financial Health
WeakWeak · Hiring · 6% CAGR over 4y
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Computed from 5 filingsProvides corporate finance and strategic advisory services to shareholders and management of marketing, media and marketing technology businesses, including mergers and acquisitions advice,…
Serves shareholders and management teams of independent media, marketing communications and marketing technology businesses, typically with enterprise values of £10m-£50m.
Financial Health
StrongStrong · Growing, Hiring · 14% CAGR over 4y
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Computed from 3 filingsProvides strategic and financial advisory services to founders and operators of technology, digital services, and digital media companies, including mergers and acquisitions advice, capital raising,…
Serves B2B founders, operators, entrepreneurs, and VC/PE-backed technology companies, particularly in software, digital services, and digital media, with an international client base.
Financial Health
StrongStrong · Hiring · 41% CAGR over 2y
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Computed from 4 filingsProvides mergers and acquisitions advisory and fundraising advice to businesses in the media and technology sectors. Advises sellers, buyers and investors on company sales, acquisitions, partner…
Serves businesses, owners, buyers and investors in the media and technology sectors, including digital media, marketing services, technology consulting, ecommerce and data/analytics firms.
Financial Health
HealthyHealthy · Hiring · 4% CAGR over 3y
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Computed from 5 filingsProvides corporate finance and investment banking advisory to public and private companies, including mergers and acquisitions advice, equity capital raising, IPO support, debt advisory, and…
Serves ambitious UK public and private companies, entrepreneurs, founders and management teams across sectors, including growth businesses, PLCs and investment companies.
Financial Health
StrongStrong · 0% CAGR over 2y
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How London Boutique M&A companies work and how to sell to them
What they do
Boutique M&A advisers earn revenue by selling partner-led professional services around company sales, acquisitions and related valuation work. Fees typically combine a retainer for preparation and process management with a completion-linked element when a transaction closes, so revenue is lumpy and tied to mandate conversion. The service is not a repeatable software product: it is a controlled project covering positioning, buyer mapping, financial materials, negotiation support and coordination with lawyers, accountants and lenders. Smaller mandates can still require senior attention because trust, confidentiality and buyer credibility sit at the centre of the work.
Who they sell to
Typical buyers are founder-shareholders, owner-managers, finance directors and boards preparing for a sale, as well as private investors and corporate acquirers looking for targets. Procurement rarely controls the process; buying is usually direct, referral-led and shaped by previous relationships with accountants, lawyers, lenders or investors. Contract value is mandate-specific and often success-weighted rather than bought from a rate card. Sales cycles can be long and uneven, because clients may speak to advisers well before a transaction is viable and then move once succession, valuation expectations or buyer interest becomes concrete.
What they buy
Most boutique M&A firms tend to spend on tools and services that protect partner time, improve deal execution and reduce operational risk. Relevant categories include CRM for relationship mapping, secure document sharing, virtual data-room support, financial modelling, market research, buyer intelligence, project management, compliance workflows, email security and knowledge management. They also buy specialist legal, tax, accounting, design, copywriting and recruitment support, usually in narrow bursts around live mandates or new hiring. Pitches that assume a large technology department often miss the mark; many firms need low-friction adoption, clear accountability and evidence that confidential client work will remain controlled.
Why and how to sell to them
Commercial pain usually appears when a lean team has more live mandates than execution capacity, when a new sector focus needs better buyer coverage, or when succession and compliance costs force partners to tidy internal processes. Hiring, a new partner group, cross-border buyer work and a visible push into mid-market transactions can all indicate buying intent. Outbound tends to land better when it speaks to mandate outcomes: shorter preparation cycles, cleaner diligence packs, fewer manual follow-ups, better relationship visibility and reduced risk around confidentiality. The safer angle is efficiency and control, not scale for its own sake.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
Also in London
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Frequently asked questions
How many boutique M&A companies are there in London?
What counts as a boutique M&A company in this list?
Which are the largest boutique M&A companies in London?
What do boutique M&A companies in London actually do?
How does London boutique M&A compare internationally?
How is this list built and how fresh is the data?
How big are the typical boutique M&A companies in London?
Are these mostly new or established boutique M&A companies?
What SIC codes does this use?
What buying signals should I look for?
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