These London-based companies, backed by private equity, generally represent mid-sized to large firms with a strong presence in professional and financial services. Noteworthy examples include Acuity Analytics, specializing in financial services research, and Grant Thornton UK, providing assurance, tax, and advisory services. Other significant companies are SLR Consulting in environmental sustainability and Domestic & General, which offers protection and repair for household appliances.
A recurring pattern within this group is the prevalence of service-oriented businesses. Beyond financial and professional services, sectors like construction with Mace, maritime transportation with V.Group, and retail with AllSaints and Waterstones also feature prominently. This indicates a diverse yet service-heavy economic landscape among private equity-backed entities in London.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Macemacegroup.com
Delivery consultancy and construction expertise for iconic buildings, data centres, life science, social infrastructure, and regeneration projects worldwide. |
9,872 | |||
| 2 |
Acuity Analyticsacuityanalytics.com
Provides bespoke research, analytics, and technology solutions to financial services, helping institutions operate efficiently and unlock human capital to drive revenue. |
7,619 | |||
| 3 |
Thomas Cookthomascook.com
A newly revived online travel business under Fosun Tourism Group, focused on providing easy holiday booking solutions with a team of travel and tech experts |
6,149 | |||
| 4 |
Grant Thornton UKgrantthornton.co.uk
Providing assurance, tax, and advisory services through a global network, combining local insight with flexible, client-focused solutions. |
5,972 | |||
| 5 | 5,889 | ||||
| 6 |
SLR Consultingslrconsulting.com
Providing expert sustainability consulting and advisory services globally, partnering with clients to solve complex environmental challenges collaboratively. |
4,311 | |||
| 7 |
Domestic & Generaldomesticandgeneral.com
Protection, repair, and care for household appliances including fridges, washing machines, TVs, and boilers, ensuring reliable home operation. |
3,376 | |||
| 8 |
PIB Grouppibgroup.co.uk
A specialist insurance solutions provider in the UK market and beyond, offering commercial and personal lines products through acquisitions and expertise |
3,023 | |||
| 9 |
AllSaintscareers.allsaints.com
A customer-centric global team creating cool clothes, curating all aspects of style in-house Agile, responsible, and focused on customer satisfaction |
2,923 | |||
| 10 |
HBK - Hottinger Brüel & Kjærhbkworld.com
Provides comprehensive testing and data analysis solutions in sound, vibration, reliability, durability, propulsion efficiency, and weighing to accelerate product development. |
2,750 | |||
| 11 |
Azzurri Groupazzurrigroup.co.uk
Hospitality investment platform operating multiple Italian and Mexican restaurant brands, serving millions of meals with focus on quality and experience. |
2,533 | |||
| 12 |
Waterstoneswaterstones.com
Leading high street bookseller in UK and Ireland with almost 300 bookshops, offering author events, book clubs, and online platform |
2,284 | |||
| 13 |
Hyve Grouphyve.group
Organizing in-person events, online platforms, and facilitated meetings to connect industry ecosystems and foster community growth and progress. |
2,246 | |||
| 14 |
S&Wswgroup.com
Financial and professional services firm specializing in wealth management, accountancy, tax advisory, and investment management solutions. |
2,218 | |||
| 15 |
Ocorianocorian.com
A global provider of fund administration, capital markets, corporate, and compliance solutions for various clients, offering expertise, trust, and scale |
1,846 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
The Compleat Food Groupcompleatfood.com
Supplier of branded and own-label pastry, bakery, party food, plant-based products, and continental meats to UK retailers and foodservice. |
1,830 | |||
| 17 |
GTAdiscover.hotelbeds.com
Connects travel providers with travel sellers globally via technology platform, increasing reach, revenue, and yield. Offers hotels, transfers, and activities. |
1,800 | |||
| 18 |
ghdghdhair.com
A stylish and innovative company known for its acclaimed range of hair stylers, focused on growth, innovation, and global expansion |
1,772 | |||
| 19 | 1,737 | ||||
| 20 |
Misysfinastra.com
It combines Misys and D+H to form a leading fintech company, Finastra, now the third largest in the world. |
1,535 | |||
| 21 |
Euromoney Institutional Investordelinian.com
Global B2B information-services business providing actionable data, analysis, intelligence, and market participant access across multiple international markets. |
1,487 | |||
| 22 |
Kurt Geigerbit.ly
A London-based footwear and accessories retailer promoting creativity, kindness, diversity, and inclusion through statement styles and kindness-driven initiatives globally |
1,435 | |||
| 23 |
Boldyn Networksmobilitie.com
A US-based telecommunications infrastructure company providing wireless solutions for robust coverage and 5G services at large venues and cities |
1,286 | |||
| 24 | 1,250 | ||||
| 25 |
Miller Insurance Services LLPmiller-insurance.com
Leading independent insurance broking firm providing specialist (re)insurance services internationally, focusing on integrity, expertise, and client trust. |
1,191 | |||
| 26 |
AnyVananyvan.com
AnyVan uses technology and innovation to improve delivery and moving processes, providing efficient, affordable, and environmentally friendly services to millions of customers |
1,177 | |||
| 27 |
Oxane Partnersoxanepartners.com
A technology-driven solutions provider for private markets, offering transformative solutions for investment analysis and management across all asset classes |
898 | |||
| 28 |
EXA Infrastructureexainfra.net
A leading digital infrastructure platform in Europe and North America, owning a vast fibre network, data centers, and sub-sea routes for optimal connectivity |
846 | |||
| 29 |
Kaplan International Languageskaplaninternational.com
A leading provider of international language courses and university pathway programs, catering to learners of all ages from over 150 countries |
823 | |||
| 30 |
Kiki-insurance.com
Ki leverages technology and data to streamline risk placement at Lloyd’s of London, providing instant underwriting decisions and expert assistance |
786 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 15, 2026.
More company lists in London
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