# The 30 largest private equity-backed companies in London
Tamtam tracks 88 private equity-backed companies headquartered in London. This list ranks the 30 largest by number of employees on LinkedIn, led by Mace, Acuity Analytics and Thomas Cook. Their median headcount is 1,846. Half of them were founded in 1991 or later.
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.
π¬π§ London Β· 30 companies Β· Updated Nov 15, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Mace](https://www.tamtam.ai/c/mace) (macegroup.com)
Delivery consultancy and construction expertise for iconic buildings, data centres, life science, social infrastructure, and regeneration projects worldwide. | Construction | π¬π§ London | 9,872 | 1990 |
| 2 | [Acuity Analytics](https://www.tamtam.ai/c/acuity-analytics) (acuityanalytics.com)
Provides bespoke research, analytics, and technology solutions to financial services, helping institutions operate efficiently and unlock human capital to drive revenue. | Financial Services | π¬π§ London | 7,619 | 2003 |
| 3 | [Thomas Cook](https://www.tamtam.ai/c/thomas-cook) (thomascook.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 | Travel Arrangements | π¬π§ London | 6,149 | 1841 |
| 4 | [Grant Thornton UK](https://www.tamtam.ai/c/grant-thornton-uk) (grantthornton.co.uk)
Providing assurance, tax, and advisory services through a global network, combining local insight with flexible, client-focused solutions. | Accounting | π¬π§ London | 5,972 | 1904 |
| 5 | [V.Group](https://www.tamtam.ai/c/v-group) (vgrouplimited.com)
A dedicated partner advancing maritime activities and innovations | Maritime Transportation | π¬π§ London | 5,889 | 1984 |
| 6 | [SLR Consulting](https://www.tamtam.ai/c/slr-consulting) (slrconsulting.com)
Providing expert sustainability consulting and advisory services globally, partnering with clients to solve complex environmental challenges collaboratively. | Environmental Services | π¬π§ London | 4,311 | 1994 |
| 7 | [Domestic & General](https://www.tamtam.ai/c/domestic-and-general) (domesticandgeneral.com)
Protection, repair, and care for household appliances including fridges, washing machines, TVs, and boilers, ensuring reliable home operation. | Financial Services | π¬π§ London | 3,376 | 1912 |
| 8 | [PIB Group](https://www.tamtam.ai/c/pib-group) (pibgroup.co.uk)
A specialist insurance solutions provider in the UK market and beyond, offering commercial and personal lines products through acquisitions and expertise | Insurance | π¬π§ London | 3,023 | 2015 |
| 9 | [AllSaints](https://www.tamtam.ai/c/allsaints) (careers.allsaints.com)
A customer-centric global team creating cool clothes, curating all aspects of style in-house Agile, responsible, and focused on customer satisfaction | Retail Apparel and Fashion | π¬π§ London | 2,923 | 1994 |
| 10 | [HBK - Hottinger Brüel & Kjær](https://www.tamtam.ai/c/hbk-hottinger-bruel-and-kjaer) (hbkworld.com)
Provides comprehensive testing and data analysis solutions in sound, vibration, reliability, durability, propulsion efficiency, and weighing to accelerate product development. | Industrial Machinery Manufacturing | π¬π§ London | 2,750 | 1942 |
| 11 | [Azzurri Group](https://www.tamtam.ai/c/azzurri-group) (azzurrigroup.co.uk)
Hospitality investment platform operating multiple Italian and Mexican restaurant brands, serving millions of meals with focus on quality and experience. | Hospitality | π¬π§ London | 2,533 | 2015 |
| 12 | [Waterstones](https://www.tamtam.ai/c/waterstones) (waterstones.com)
Leading high street bookseller in UK and Ireland with almost 300 bookshops, offering author events, book clubs, and online platform | Retail | π¬π§ London | 2,284 | 1982 |
| 13 | [Hyve Group](https://www.tamtam.ai/c/hyve-group) (hyve.group)
Organizing in-person events, online platforms, and facilitated meetings to connect industry ecosystems and foster community growth and progress. | Events Services | π¬π§ London | 2,246 | 1991 |
| 14 | [S&W](https://www.tamtam.ai/c/s-and-w) (swgroup.com)
Financial and professional services firm specializing in wealth management, accountancy, tax advisory, and investment management solutions. | Professional Services | π¬π§ London | 2,218 | 1881 |
| 15 | [Ocorian](https://www.tamtam.ai/c/ocorian) (ocorian.com)
A global provider of fund administration, capital markets, corporate, and compliance solutions for various clients, offering expertise, trust, and scale | Financial Services | π¬π§ London | 1,846 | 1971 |
| 16 | [The Compleat Food Group](https://www.tamtam.ai/c/the-compleat-food-group) (compleatfood.com)
Supplier of branded and own-label pastry, bakery, party food, plant-based products, and continental meats to UK retailers and foodservice. | Food and Beverage Manufacturing | π¬π§ London | 1,830 | 2021 |
| 17 | [GTA](https://www.tamtam.ai/c/gta) (discover.hotelbeds.com)
Connects travel providers with travel sellers globally via technology platform, increasing reach, revenue, and yield. Offers hotels, transfers, and activities. | Retail Motor Vehicles | π¬π§ London | 1,800 | 1975 |
| 18 | [ghd](https://www.tamtam.ai/c/ghd-london) (ghdhair.com)
A stylish and innovative company known for its acclaimed range of hair stylers, focused on growth, innovation, and global expansion | Retail | π¬π§ London | 1,772 | 2001 |
| 19 | [Rubix](https://www.tamtam.ai/c/rubix) (rubix.com)
A leading supplier of industrial maintenance and repair products, bringing together expertise from multiple brands to serve over 220,000 customers in Europe | Manufacturing | π¬π§ London | 1,737 | 1920 |
| 20 | [Misys](https://www.tamtam.ai/c/misys) (finastra.com)
It combines Misys and D+H to form a leading fintech company, Finastra, now the third largest in the world. | Financial Services | π¬π§ London | 1,535 | 1979 |
| 21 | [Euromoney Institutional Investor](https://www.tamtam.ai/c/euromoney-institutional-investor) (delinian.com)
Global B2B information-services business providing actionable data, analysis, intelligence, and market participant access across multiple international markets. | Information Services | π¬π§ London | 1,487 | |
| 22 | [Kurt Geiger](https://www.tamtam.ai/c/kurt-geiger) (bit.ly)
A London-based footwear and accessories retailer promoting creativity, kindness, diversity, and inclusion through statement styles and kindness-driven initiatives globally | Retail | π¬π§ London | 1,435 | 1963 |
| 23 | [Boldyn Networks](https://www.tamtam.ai/c/boldyn-networks) (mobilitie.com)
A US-based telecommunications infrastructure company providing wireless solutions for robust coverage and 5G services at large venues and cities | Telecommunications | π¬π§ London | 1,286 | 2005 |
| 24 | [Isio](https://www.tamtam.ai/c/isio) (isio.com)
A leading financial services company challenging traditional thinking in pensions, benefits, and investment advice by providing expertise and innovative solutions | Financial Services | π¬π§ London | 1,250 | 2020 |
| 25 | [Miller Insurance Services LLP](https://www.tamtam.ai/c/miller-insurance-services-llp) (miller-insurance.com)
Leading independent insurance broking firm providing specialist (re)insurance services internationally, focusing on integrity, expertise, and client trust. | Insurance | π¬π§ London | 1,191 | 1902 |
| 26 | [AnyVan](https://www.tamtam.ai/c/anyvan) (anyvan.com)
AnyVan uses technology and innovation to improve delivery and moving processes, providing efficient, affordable, and environmentally friendly services to millions of customers | Transportation, Logistics, Supply Chain and Storage | π¬π§ London | 1,177 | 2009 |
| 27 | [Oxane Partners](https://www.tamtam.ai/c/oxane-partners) (oxanepartners.com)
A technology-driven solutions provider for private markets, offering transformative solutions for investment analysis and management across all asset classes | Financial Services | π¬π§ London | 898 | 2014 |
| 28 | [EXA Infrastructure](https://www.tamtam.ai/c/exa-infrastructure) (exainfra.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 | Telecommunications | π¬π§ London | 846 | 2021 |
| 29 | [Kaplan International Languages](https://www.tamtam.ai/c/kaplan-international-languages) (kaplaninternational.com)
A leading provider of international language courses and university pathway programs, catering to learners of all ages from over 150 countries | Language Schools | π¬π§ London | 823 | |
| 30 | [Ki](https://www.tamtam.ai/c/ki-london) (ki-insurance.com)
Ki leverages technology and data to streamline risk placement at Lloydβs of London, providing instant underwriting decisions and expert assistance | Insurance | π¬π§ London | 786 | 2020 |
## 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
- [The largest companies in London](https://www.tamtam.ai/l/largest-companies-london) (12,882)
- [Multinational companies in London](https://www.tamtam.ai/l/multinational-companies-london) (3,652)
- [Financial Services companies in London](https://www.tamtam.ai/l/financial-services-companies-london) (1,862)
- [Financial services firms in London](https://www.tamtam.ai/l/financial-services-firms-london) (1,824)
- [SaaS companies in London](https://www.tamtam.ai/l/saas-companies-london) (1,615)
- [Professional services firms in London](https://www.tamtam.ai/l/professional-services-firms-london) (1,248)
- [Software Development companies in London](https://www.tamtam.ai/l/software-development-companies-london) (1,217)
- [Retail chains in London](https://www.tamtam.ai/l/retail-chains-london) (942)
- [IT Services and IT Consulting companies in London](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-london) (693)
- [Companies with a mobile app in London](https://www.tamtam.ai/l/companies-with-mobile-app-london) (667)
- [Consulting firms in London](https://www.tamtam.ai/l/consulting-firms-london) (648)
- [IT services companies in London](https://www.tamtam.ai/l/it-services-companies-london) (607)
- [Subscription businesses in London](https://www.tamtam.ai/l/subscription-businesses-london) (544)
- [Venture capital and private equity firms in London](https://www.tamtam.ai/l/vc-and-private-equity-firms-london) (539)
- [Marketing and communications agencies in London](https://www.tamtam.ai/l/marketing-agencies-london) (533)
- [Retail Apparel and Fashion companies in London](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-london) (498)
- [Advertising Services companies in London](https://www.tamtam.ai/l/advertising-services-companies-london) (480)
- [Companies with in-house R&D in London](https://www.tamtam.ai/l/r-and-d-companies-london) (477)
- [AI companies in London](https://www.tamtam.ai/l/ai-companies-london) (456)
- [Investment Management companies in London](https://www.tamtam.ai/l/investment-management-companies-london) (452)
- [Hotel and hospitality groups in London](https://www.tamtam.ai/l/hospitality-groups-london) (445)
- [Luxury brands in London](https://www.tamtam.ai/l/luxury-brands-london) (428)
- [AI-native companies in London](https://www.tamtam.ai/l/ai-native-companies-london) (407)
- [E-commerce companies in London](https://www.tamtam.ai/l/ecommerce-companies-london) (384)
## The same list elsewhere in United Kingdom
- [Private equity-backed companies in the United Kingdom](https://www.tamtam.ai/l/private-equity-backed-companies-united-kingdom) (202)
## The same list elsewhere
- [Private equity-backed companies in the world](https://www.tamtam.ai/l/private-equity-backed-companies-in-the-world) (1,497)
- [Private equity-backed companies in Europe](https://www.tamtam.ai/l/private-equity-backed-companies-in-europe) (710)
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Source: https://www.tamtam.ai/l/private-equity-backed-companies-london