# 100 leading managed service providers in the United Kingdom
Tamtam tracks 275 managed service providers headquartered in the United Kingdom. This list ranks the 100 largest by number of employees on LinkedIn, led by FUJITSU, Computacenter and Iron Mountain EMEA. Their median headcount is 665. Half of them were founded in 1999 or later. The most common headquarters are London (40), Manchester (7) and Birmingham (2).
The companies listed here are large managed service providers headquartered in the United Kingdom. They mostly offer IT services and consulting, with a significant presence in telecommunications. FUJITSU, a global information and communication technology company, is the largest. Computacenter helps large organizations manage and transform their technology infrastructure, while Iron Mountain EMEA specializes in storage and information management services. SCC provides limitless IT solutions, including cybersecurity and digital workplace services. Vodafone Business offers mobile, fixed, unified communications, IoT, cloud, and security services.
A notable pattern among these companies is the concentration of headquarters in London, with several other significant presences in cities like Hatfield, Birmingham, and Warwick. This indicates a strong hub for managed IT and telecommunications services within the UK.
π¬π§ United Kingdom Β· 100 companies Β· Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [FUJITSU](https://www.tamtam.ai/c/fujitsu) (global.fujitsu)
Leading global information and communication technology company, offering technology products, solutions, and services, connecting people, technology, and ideas for a sustainable world. | IT Services and IT Consulting | π¬π§ | 124,000 | 1935 |
| 2 | [Computacenter](https://www.tamtam.ai/c/computacenter) (computacenter.com)
A leading technology and services provider, trusted by large organizations, helping customers manage and transform their technology infrastructure for digital transformation | IT Services and IT Consulting | π¬π§ Hatfield | 20,070 | 1981 |
| 3 | [Iron Mountain EMEA](https://www.tamtam.ai/c/iron-mountain-emea) (ironmountain.co.uk)
Global leader in storage and information management services with a vast network of facilities worldwide, offering solutions for records, data, and document management | IT Services and IT Consulting | π¬π§ London | 15,148 | |
| 4 | [SCC](https://www.tamtam.ai/c/scc) (scc.com)
SCC is a leading IT group in Europe, providing limitless IT solutions, cyber security services, digital workplace solutions, and hybrid infrastructure services | IT Services and IT Consulting | π¬π§ Birmingham | 8,687 | 1975 |
| 5 | [Vodafone Business](https://www.tamtam.ai/c/vodafone-business) (vodafone.com)
Providing mobile, fixed, unified communications, IoT, cloud, and security services to businesses globally, regionally, and locally. | Telecommunications | π¬π§ London | 8,100 | |
| 6 | [Colt Technology Services](https://www.tamtam.ai/c/colt-technology-services) (colt.net)
Global digital infrastructure provider connecting businesses across 40+ countries with extensive networks, customer-focused innovation, and reliable connectivity solutions. | Telecommunications | π¬π§ London | 5,107 | 1992 |
| 7 | [Logicalis](https://www.tamtam.ai/c/logicalis) (logicalis.com)
A global technology service provider helping organizations succeed in a digital-first world through cloud, connectivity, collaboration, and security solutions | IT Services and IT Consulting | π¬π§ Maidenhead | 4,868 | 1998 |
| 8 | [Infobip](https://www.tamtam.ai/c/infobip) (infobip.com)
Global leader in omnichannel engagement, providing messaging tools and solutions for customer engagement, authentication, and security with a strong focus on quality engineering | IT Services and IT Consulting | π¬π§ London | 3,501 | 2006 |
| 9 | [Claranet](https://www.tamtam.ai/c/claranet) (claranet.com)
A global technology services provider offering managed services, professional services, and training in Cloud, Networks, Cyber Security, and Workplace technologies since 1996 | IT Services and IT Consulting | π¬π§ London | 3,073 | 1996 |
| 10 | [Telent Technology Services Ltd](https://www.tamtam.ai/c/telent-technology-services-ltd) (telent.com)
Leading technology company specializing in designing, building, operating, and maintaining critical digital infrastructure for public sector, transport, emergency services, and network providers | Telecommunications | π¬π§ Warwick | 2,675 | |
| 11 | [Gamma](https://www.tamtam.ai/c/gamma) (gammagroup.co)
Gamma is a leading supplier of Unified Communications services in the UK, Germany, Spain, and Benelux, offering robust solutions for communication and collaboration | Telecommunications | π¬π§ London | 2,588 | 2002 |
| 12 | [NTT Global Data Centers](https://www.tamtam.ai/c/ntt-global-data-centers) (services.global.ntt)
Global Data Centers, now a part of NTT DATA, offers neutral access to cloud providers, internet exchanges, and telecom providers with reliable data centers worldwide | IT Services and IT Consulting | π¬π§ London | 2,449 | |
| 13 | [Canonical](https://www.tamtam.ai/c/canonical) (canonical.com)
Publishing Ubuntu, popular enterprise Linux, open source delivery, cloud to edge, secure, cost-effective, global community, developer platform, remote-first company. | Software Development | π¬π§ London | 2,001 | 2004 |
| 14 | [Hardware](https://www.tamtam.ai/c/hardware) (kubus.com)
A hardware company formed in 2003 is now Kubus Group Limited Follow on LinkedIn for company updates, employee information, and career opportunities | IT Services and IT Consulting | π¬π§ Cirencester | 1,667 | 2003 |
| 15 | [MTI](https://www.tamtam.ai/c/mti-staines-upon-thames) (mti.com)
Provides comprehensive cybersecurity and data centre technology solutions, managed services, and consulting to support secure, compliant IT infrastructure management. | IT Services and IT Consulting | π¬π§ Staines-upon-Thames | 1,660 | 1987 |
| 16 | [CDS, an HPE company](https://www.tamtam.ai/c/cds-an-hpe-company) (hpecds.com)
Delivers customer experience and services across HPE Edge-to-Cloud platforms, offering early career technical roles and professional development opportunities to aspiring talent. | IT Services and IT Consulting | π¬π§ Winnersh | 1,604 | 2004 |
| 17 | [CSC UKI](https://www.tamtam.ai/c/csc-uki) (dxc.com)
A leading independent IT services company formed through the merger of HPE Enterprise Services and CSC, offering end-to-end solutions with longevity | Outsourcing and Offshoring Consulting | π¬π§ London | 1,442 | |
| 18 | [Connect](https://www.tamtam.ai/c/connect-london) (weconnect.tech)
Communication experts providing solutions in Contact Centre, Unified Communications, and Network Services, delivering digital transformation through bespoke strategies for businesses globally | IT Services and IT Consulting | π¬π§ London | 1,387 | 1990 |
| 19 | [Daisy Group](https://www.tamtam.ai/c/daisy-group-nelson) (linkedin.com)
A leading provider of communications, IT, and cloud services in the UK and internationally, offering solutions for businesses of all sizes | IT Services and IT Consulting | π¬π§ Nelson | 1,368 | 2001 |
| 20 | [Advania UK](https://www.tamtam.ai/c/advania-uk) (advania.co.uk)
Specializes in Microsoft technologies like AI, Azure, and Dynamics 365 to deliver transformational IT services and sustainable value for customers. | IT Services and IT Consulting | π¬π§ London | 1,351 | |
| 21 | [Jisc](https://www.tamtam.ai/c/jisc) (jisc.ac.uk)
National research infrastructure providing high-speed connectivity, cyber security, and technology solutions to UK universities and schools through shared services and digital data tools. | Education | π¬π§ Bristol | 1,333 | |
| 22 | [Focus Group](https://www.tamtam.ai/c/focus-group) (focusgroup.co.uk)
Provides essential business technology, including telecoms, IT, connectivity, mobile, cyber security, and energy solutions for various organizations, ensuring optimized and secure operations. | Technology, Information and Internet | π¬π§ Shoreham-by-Sea | 1,315 | 2003 |
| 23 | [MASS](https://www.tamtam.ai/c/mass) (mass.co.uk)
A dynamic technology company within the Cohort plc group, specializing in electronic warfare support, cyber security, IT managed services, and data management | Defense and Space Manufacturing | π¬π§ St Neots | 1,294 | |
| 24 | [Wavenet](https://www.tamtam.ai/c/wavenet) (wavenet.co.uk)
A UK-based company providing unified communications, business telephony, and Cyber Security solutions to help businesses overcome real challenges and achieve brilliance | Technology, Information and Internet | π¬π§ Solihull | 1,284 | 2000 |
| 25 | [First Technology UK](https://www.tamtam.ai/c/first-technology-uk) (first-technology.co.uk)
A group of companies providing IT products and services to help organizations navigate technology challenges and achieve their business outcomes | IT Services and IT Consulting | π¬π§ Pangbourne | 1,224 | 1982 |
| 26 | [NSC Global](https://www.tamtam.ai/c/nsc-global) (nscglobal.com)
This company simplifies global business with expert teams delivering IT services to clients in over 180 countries, flexibly adapting to their needs | IT Services and IT Consulting | π¬π§ London | 1,070 | 1997 |
| 27 | [CTS](https://www.tamtam.ai/c/cts) (cts.co)
Largest Google Cloud-only digital consultancy in Europe, providing strategic consulting and engineering for AI, martech, data, and cloud security solutions. | IT Services and IT Consulting | π¬π§ Manchester | 1,015 | 2008 |
| 28 | [ANS Group](https://www.tamtam.ai/c/ans-group) (ans.co.uk)
Providing accessible, affordable enterprise-grade technology and digital transformation solutions to businesses of all sizes, enabling growth and innovation. | IT Services and IT Consulting | π¬π§ Manchester | 975 | 1996 |
| 29 | [ICM](https://www.tamtam.ai/c/icm) (icm.co.uk)
A UK-based IT infrastructure and business continuity services provider offering managed hosting, cloud services, disaster recovery, networking, and professional services to various sectors | IT Services and IT Consulting | π¬π§ Birstall | 971 | 1979 |
| 30 | [Maintel](https://www.tamtam.ai/c/maintel) (maintel.co.uk)
Provider of cloud communications and managed services, specializing in digital transformation for public and private sectors Delivering digital workplace, customer experience, and secure connectivity solutions globally | Telecommunications | π¬π§ London | 946 | 1991 |
| 31 | [Node4](https://www.tamtam.ai/c/node4) (node4.co.uk)
Node4 specializes in providing a wide range of tech solutions and managed services to help organizations achieve their strategic goals through digital transformation | IT Services and IT Consulting | π¬π§ Derby | 933 | 2004 |
| 32 | [Dimension Data UKI](https://www.tamtam.ai/c/dimension-data-uki) (services.global.ntt)
This company helps organizations achieve their goals through digital infrastructure, hybrid cloud, workspaces, and cybersecurity, empowering businesses to excel and grow with ICT solutions | IT Services and IT Consulting | π¬π§ Fleet | 895 | 1983 |
| 33 | [Bell Integration](https://www.tamtam.ai/c/bell-integration) (bell-integration.com)
Provides technology consultation and managed services enabling organizations to transform IT capabilities, enhancing productivity, and cost efficiency. Specializes in IT services and infrastructure. | IT Services and IT Consulting | π¬π§ Portsmouth | 885 | 1996 |
| 34 | [Bytes Software Services](https://www.tamtam.ai/c/bytes-software-services) (bytes.co.uk)
Provider of IT solutions including cloud, security, AI, data management, licensing, training, deployment, and managed services for diverse sectors. | IT Services and IT Consulting | π¬π§ Leatherhead | 868 | 1982 |
| 35 | [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 |
| 36 | [Arrow Business Communications](https://www.tamtam.ai/c/arrow-business-communications) (aro.tech)
Provides cloud, collaboration, and sustainability IT solutions to major UK clients including FTSE100 companies, law firms, universities, NHS, and emergency services. | Telecommunications | π¬π§ Godalming | 836 | |
| 37 | [Cobra](https://www.tamtam.ai/c/cobra) (amazingsupport.co.uk)
We successfully completed a company acquisition in June 2012 resulting in a re-brand to Amazing Support, providing quality business solutions | IT Services and IT Consulting | π¬π§ London | 831 | 2007 |
| 38 | [DC Thomson](https://www.tamtam.ai/c/dc-thomson) (dcthomson.co.uk)
A leading UK media organization diversifying into publishing, digital technology, radio, TV, events, genealogy, cloud solutions, and a variety of media brands | Technology, Information and Media | π¬π§ Dundee | 815 | 1905 |
| 39 | [Kerv](https://www.tamtam.ai/c/kerv) (kerv.com)
Kerv is a purpose-driven cloud and digital services organization providing enterprise software, consulting, networking, security, and digital transformation services across key industries | IT Services and IT Consulting | π¬π§ London | 782 | 2020 |
| 40 | [Xyratex](https://www.tamtam.ai/c/xyratex) (seagate.com)
A provider of Intelligent Information Infrastructure solutions, helping organizations handle digital data growth and meet next-generation workload demands | Computer Hardware Manufacturing | π¬π§ Havant | 761 | 1994 |
| 41 | [Nasstar](https://www.tamtam.ai/c/nasstar) (nasstar.com)
specialise in managed technology services including cloud optimisation, application modernisation, networking, security, and consultative implementation for business success | IT Services and IT Consulting | π¬π§ Wakefield | 755 | 1998 |
| 42 | [Beyond](https://www.tamtam.ai/c/beyond) (bynd.com)
A design agency focused on enhancing customer experiences through strategy, technology, and design, serving diverse clients globally with a remote-first workforce | IT Services and IT Consulting | π¬π§ London | 752 | 2010 |
| 43 | [Onecom](https://www.tamtam.ai/c/onecom) (onecom.co.uk)
The UK's top business telecoms provider offering communication services and unified solutions like fixed-line voice, connectivity, and managed cloud to 80,000+ clients | Telecommunications | π¬π§ Fareham | 742 | 2002 |
| 44 | [UBIO](https://www.tamtam.ai/c/ubio) (ub.io)
UBIO connects websites and APIs to collect data for clients like Google and trivago, enabling them to sell tickets and collect information | Technology, Information and Internet | π¬π§ London | 706 | 2013 |
| 45 | [Exponential-e](https://www.tamtam.ai/c/exponential-e) (exponential-e.com)
Provides superfast network and cloud infrastructure delivering tailored enterprise solutions including data centre, cloud, unified communications, security, and IT services. | IT Services and IT Consulting | π¬π§ London | 695 | 2002 |
| 46 | [Systal Technology Solutions](https://www.tamtam.ai/c/systal-technology-solutions) (systaltech.com)
Specialist in managing complex network, cloud, and security services globally, enabling enterprise businesses to transform technology and maximize IT value. | IT Services and IT Consulting | π¬π§ Glasgow | 694 | |
| 47 | [Zenzero](https://www.tamtam.ai/c/zenzero) (zenzero.co.uk)
Design tailored IT infrastructure solutions using proven technologies to optimize client operations and maximize value from resources. | IT Services and IT Consulting | π¬π§ London | 688 | 2004 |
| 48 | [DSP](https://www.tamtam.ai/c/dsp-london) (dsp.co.uk)
Specializes in secure, optimized database management and consulting for Oracle, SQL Server, and multi-cloud environments including Azure and Oracle Cloud. | IT Services and IT Consulting | π¬π§ London | 679 | 1999 |
| 49 | [Littlefish Group](https://www.tamtam.ai/c/littlefish-group) (littlefish.co.uk)
Providing 24/7 IT support, cyber security, cloud solutions, managed infrastructure, and consultancy for enterprise organisations across sectors. | IT Services and IT Consulting | π¬π§ Nottingham | 674 | 2003 |
| 50 | [Onnec](https://www.tamtam.ai/c/onnec) (onnecgroup.com)
A leading technology partner offering end-to-end connectivity solutions including structured cabling, networking, managed services, and integrated intelligent systems for businesses globally | IT Services and IT Consulting | π¬π§ London | 665 | |
| 51 | [Options Technology](https://www.tamtam.ai/c/options-technology) (options-it.com)
Provides global financial technology solutions specializing in banking and trading infrastructure, integrating high-performance networking, cloud, security, and AI technologies. | IT Services and IT Consulting | π¬π§ London | 641 | 1993 |
| 52 | [Acora - IT, Cyber & AI](https://www.tamtam.ai/c/acora-it-cyber-and-ai) (acora.com)
UK-based company offering IT support, cybersecurity, applications, data management, and cloud solutions to protect and optimize business technology. | IT Services and IT Consulting | π¬π§ Burgess Hill | 639 | 1989 |
| 53 | [Giacom](https://www.tamtam.ai/c/giacom) (giacom.com)
The company provides a platform for technology resellers and MSPs to access various services and products to create solutions for UK small businesses | IT Services and IT Consulting | π¬π§ London | 633 | |
| 54 | [Phoenix Software](https://www.tamtam.ai/c/phoenix-software) (phoenixs.co.uk)
Innovative UK IT solutions provider driving digital transformation with cloud, data, AI, security, and collaboration tools Recognized for diversity and Microsoft partnership | IT Services and IT Consulting | π¬π§ York | 605 | 1990 |
| 55 | [PXC](https://www.tamtam.ai/c/pxc) (pxc.co.uk)
Leading UK wholesale provider of connectivity, voice, cloud, and security solutions with a robust network, offering tailored support for business growth and success | Telecommunications | π¬π§ Manchester | 604 | |
| 56 | [Redcentric](https://www.tamtam.ai/c/redcentric) (redcentricplc.com)
A managed service provider delivering network, cloud, and collaboration solutions to help public and private sector organizations succeed with agile and assured services | IT Services and IT Consulting | π¬π§ Harrogate | 602 | 1997 |
| 57 | [Nscale](https://www.tamtam.ai/c/nscale) (nscale.com)
Specializing in AI, Nscale provides a GPU cloud platform in Europe for high-performance computing optimized for training and intensive workloads | Technology, Information and Internet | π¬π§ London | 585 | 2024 |
| 58 | [boxxe](https://www.tamtam.ai/c/boxxe) (boxxe.com)
Provider of hardware, software, and managed IT services delivering flexible technology solutions to enhance productivity, security, and operational efficiency. | IT Services and IT Consulting | π¬π§ Hemel Hempstead | 578 | 1987 |
| 59 | [Ultima](https://www.tamtam.ai/c/ultima) (ultima.com)
Providing end-to-end cloud, security, data, and AI solutions with tailored managed services for global private and public sector clients. | IT Services and IT Consulting | π¬π§ Reading | 575 | 1990 |
| 60 | [Zen Internet](https://www.tamtam.ai/c/zen-internet) (zen.co.uk)
Telecommunications and technology service provider offering business broadband, Ethernet, data services, and expert cloud solutions for diverse business needs. | Telecommunications | π¬π§ Rochdale | 562 | 1995 |
| 61 | [TSG](https://www.tamtam.ai/c/tsg) (tsg.com)
TSG is a leading UK IT company providing comprehensive technology solutions and support including IT infrastructure, software, telecoms, broadband, and cloud computing | IT Services and IT Consulting | π¬π§ Gateshead | 561 | 2003 |
| 62 | [TelefΓ³nica Tech (EN)](https://www.tamtam.ai/c/telefonica-tech-en) (telefonicatech.uk)
Specialist provider of integrated technology solutions including cybersecurity, cloud, data, AI, business applications, and digital workplace services. | IT Services and IT Consulting | π¬π§ London | 557 | |
| 63 | [Sharp UK](https://www.tamtam.ai/c/sharp-uk) (sharp.co.uk)
Innovative workplace technologies and services that support new ways of working, designed to benefit people's lifestyles and work styles | IT Services and IT Consulting | π¬π§ East Ardsley | 548 | |
| 64 | [Fortray Global Service Limited](https://www.tamtam.ai/c/fortray-global-service-limited) (fortray.com)
Provides services for digital transformation, cybersecurity, cloud, and managed IT. Also develops talent through tech and AI bootcamps for various digital skills. | IT Services and IT Consulting | π¬π§ London | 547 | 2011 |
| 65 | [TalkTalk Business](https://www.tamtam.ai/c/talktalk-business) (business.talktalk.co.uk)
Providing UK businesses with internet, data, voice, and network infrastructure solutions alongside managed services and dedicated support. | Telecommunications | π¬π§ Manchester | 538 | 1995 |
| 66 | [Lemongrass](https://www.tamtam.ai/c/lemongrass) (lemongrasscloud.com)
Provides automated managed services for SAP on Cloud, enabling scalable, agile, and innovative enterprise solutions with near zero downtime migrations. | IT Services and IT Consulting | π¬π§ Reading | 535 | 2008 |
| 67 | [Medhurst](https://www.tamtam.ai/c/medhurst) (medhurst-it.com)
Providing cost-effective and flexible IT solutions for businesses and the public sector, relieving clients of IT management burdens to focus on core business | IT Services and IT Consulting | π¬π§ Fareham | 525 | 1986 |
| 68 | [Colt Data Centre Services](https://www.tamtam.ai/c/colt-data-centre-services) (coltdatacentres.net)
Specializing in data centre services, the company designs, builds, manages, and innovates infrastructure solutions to support customers' growth globally | IT Services and IT Consulting | π¬π§ London | 483 | |
| 69 | [Intercity](https://www.tamtam.ai/c/intercity) (intercity.technology)
Intercity helps businesses improve their IT capabilities and solve technology issues, focusing on cloud, security, communications, and managed IT services | IT Services and IT Consulting | π¬π§ Birmingham | 472 | 1985 |
| 70 | [Hitachi Solutions UK](https://www.tamtam.ai/c/hitachi-solutions-uk) (hitachi-solutions.co.uk)
Provides business-tailored services and solutions for transformation journeys, including finance, low code, AI, and data-based transformation, offering advisory and application support. | IT Services and IT Consulting | π¬π§ London | 462 | 2012 |
| 71 | [EPI-USE Labs](https://www.tamtam.ai/c/epi-use-labs) (epiuselabs.com)
Global software solutions company specializing in maximizing SAP system performance, simplifying data management, and helping clients navigate business challenges successfully | IT Services and IT Consulting | π¬π§ Manchester | 454 | 1983 |
| 72 | [Global Switch](https://www.tamtam.ai/c/global-switch) (globalswitch.com)
Ownership and operation of large-scale, carrier-neutral data centers across Europe and Asia-Pacific, providing secure, resilient solutions to diverse customers. | Real Estate | π¬π§ London | 447 | 1998 |
| 73 | [Trustmarque](https://www.tamtam.ai/c/trustmarque) (trustmarque.com)
Delivers technology value through IT solutions, helping organizations acquire and adopt the right technology to create innovation across various IT domains. | IT Services and IT Consulting | π¬π§ York | 431 | 1987 |
| 74 | [Iomart](https://www.tamtam.ai/c/iomart) (iomart.com)
Cloud computing and IT managed services provider offering secure hybrid cloud, network connectivity, data management, and digital workplace capabilities to enable businesses to operate seamlessly | IT Services and IT Consulting | π¬π§ Glasgow | 426 | |
| 75 | [Air IT Group](https://www.tamtam.ai/c/air-it-group) (airit.co.uk)
Provides managed IT services including cybersecurity, business intelligence, automation, cloud solutions, and IT support to optimize and scale SME operations. | IT Services and IT Consulting | π¬π§ Nottingham | 419 | 2005 |
| 76 | [EPCC](https://www.tamtam.ai/c/epcc) (epcc.ed.ac.uk)
Provider of supercomputing and data services to industry and academia, offering advanced computing facilities, education & training programs, and cutting-edge research in HPC and data science | Higher Education | π¬π§ Edinburgh | 414 | 1990 |
| 77 | [BCN](https://www.tamtam.ai/c/bcn-manchester) (bcn.co.uk)
Providing managed IT services, digital transformation guidance, cloud solutions, and security expertise to help organizations innovate and compete effectively. | IT Services and IT Consulting | π¬π§ Manchester | 412 | 2009 |
| 78 | [Babble](https://www.tamtam.ai/c/babble) (babble.cloud)
The company specializes in simplifying the use, deployment, and management of next-generation technology for ambitious businesses | Telecommunications | π¬π§ Basildon | 411 | 2001 |
| 79 | [Easynet Group](https://www.tamtam.ai/c/easynet-group) (easynet.com)
A provider of managed services for national and global businesses, offering network, hosting, and unified communications solutions, along with security and application performance management | Telecommunications | π¬π§ London | 408 | 1994 |
| 80 | [Elevate](https://www.tamtam.ai/c/elevate-manchester) (elevate.uk)
Providing affordable, hyperfast internet access to empower individuals, drive economic growth, and foster technological innovation worldwide. | Technology, Information and Internet | π¬π§ Manchester | 402 | 2014 |
| 81 | [ArpaWare](https://www.tamtam.ai/c/arpaware) (arpaware.com)
This company specializes in providing cost-effective, high-capacity networking solutions for modern data centers using Open networking and OpenStack technology to reduce costs and complexities | IT Services and IT Consulting | π¬π§ London | 401 | 2015 |
| 82 | [Transparity](https://www.tamtam.ai/c/transparity) (transparity.com)
Leading UK Microsoft partner offering professional services, managed services, and licensing to support digital transformation with expertise in various Microsoft technology areas | IT Services and IT Consulting | π¬π§ London | 397 | |
| 83 | [PURVIEW](https://www.tamtam.ai/c/purview) (purviewservices.com)
Providing IT engineering and talent solutions to mid-market and Fortune 500 companies globally, with expertise in data, AI, cloud, and cybersecurity services. | IT Services and IT Consulting | π¬π§ Edinburgh | 395 | 2010 |
| 84 | [MBA](https://www.tamtam.ai/c/mba) (mba-it.com)
IT solutions and services provider in London, specializing in complex applications, enterprise capabilities, and exceptional service for businesses in finance, legal, and insurance sectors | IT Services and IT Consulting | π¬π§ London | 388 | 2005 |
| 85 | [prosource.it](https://www.tamtam.ai/c/prosource-it) (prosource.it)
Managed IT services provider specializing in infrastructure, operational, and project requirements for corporate enterprises globally, with expertise in various industries and locations | IT Services and IT Consulting | π¬π§ Aberdeen | 382 | 1999 |
| 86 | [Interoute](https://www.tamtam.ai/c/interoute) (exainfra.net)
A leading digital infrastructure platform connecting Europe and North America with extensive fiber network and data centers, offering low-latency sub-sea routes | Telecommunications | π¬π§ London | 367 | 2021 |
| 87 | [NTT DATA Business Solutions UK&I](https://www.tamtam.ai/c/ntt-data-business-solutions-uk-and-i) (nttdata-solutions.com)
This company specializes in transforming SAP solutions to drive innovation and help businesses become more efficient, effective, and successful globally | IT Services and IT Consulting | π¬π§ London | 364 | 1989 |
| 88 | [MainOne](https://www.tamtam.ai/c/mainone) (mainone.net)
Leading connectivity and managed services provider, delivering innovative services for digital transformation, including top-tier data center services, network solutions and cloud services in West Africa. | Telecommunications | π¬π§ Victoria Island | 363 | 2007 |
| 89 | [Daisy Groupβ’](https://www.tamtam.ai/c/daisy-group) (daisygroup.co.uk)
The company is a leading UK provider of voice, connectivity, mobile, phone systems, and cloud services for businesses across various sectors | Telecommunications | π¬π§ Brierfield | 354 | 2001 |
| 90 | [Telehouse](https://www.tamtam.ai/c/telehouse) (telehouse.net)
Provider of global data centre colocation services with extensive connectivity, secure facilities, and sustainable operations across major commercial hubs. | Telecommunications | π¬π§ London | 343 | 1988 |
| 91 | [Kocho](https://www.tamtam.ai/c/kocho) (kocho.co.uk)
Empowering ambitious companies with Microsoft cloud solutions, identity, mobility, connectivity, and cyber security services for secure growth and business success | IT Services and IT Consulting | π¬π§ London | 332 | 2001 |
| 92 | [Aspire Technology Solutions](https://www.tamtam.ai/c/aspire-technology-solutions) (aspirets.com)
It is a leading UK provider of managed IT, cyber security, and workplace solutions, serving over 2,000 customers effectively. | IT Services and IT Consulting | π¬π§ Gateshead | 321 | 2006 |
| 93 | [Converge Technology Solutions UK](https://www.tamtam.ai/c/converge-technology-solutions-uk) (convergetp.co.uk)
Transforming organizations with technology solutions, IT services, and support while championing sustainability and providing bespoke solutions for a variety of industries | IT Services and IT Consulting | π¬π§ Stafford | 318 | 1991 |
| 94 | [Six Degrees](https://www.tamtam.ai/c/six-degrees) (6dg.co.uk)
Providing AI-enabled, people-led technology services in Core, Hybrid Cloud, Cyber Security, and Modern Work aligned with client outcomes. | IT Services and IT Consulting | π¬π§ London | 313 | 2011 |
| 95 | [ARO Technology](https://www.tamtam.ai/c/aro-technology) (aro.tech)
A 25-year enterprise specializing in cloud, cyber, IT services, and sustainability Offers advanced cloud technologies, managed services, and secure platforms for high-performing teams | IT Services and IT Consulting | π¬π§ Liverpool | 307 | 1995 |
| 96 | [Armakuni](https://www.tamtam.ai/c/armakuni) (armakuni.com)
The company helps organizations leverage cloud-native technologies and processes to drive growth, increase efficiency, minimize risk, and accelerate delivery for sustainable success | IT Services and IT Consulting | π¬π§ London | 307 | 2012 |
| 97 | [Total IT Global](https://www.tamtam.ai/c/total-it-global) (totalitglobal.com)
Total IT Global offers innovative hardware and managed IT services for digital workplaces and data centers, specializing in digital transformations for high-growth enterprises | IT Services and IT Consulting | π¬π§ London | 304 | 2015 |
| 98 | [Pulsant](https://www.tamtam.ai/c/pulsant) (pulsant.com)
Provides next-generation cloud, colocation, and connectivity services via 12 edge data centers, enabling regional enterprises and service providers to innovate and grow with edge computing and hybrid cloud environments. | IT Services and IT Consulting | π¬π§ Maidenhead | 300 | 1995 |
| 99 | [CCS Media Limited (Advania UK)](https://www.tamtam.ai/c/ccs-media-limited-advania-uk) (ccsmedia.com)
Leading Northern European IT services provider delivering managed services, hardware, software, and professional support focused on client needs and business outcomes. | IT Services and IT Consulting | π¬π§ Chesterfield | 291 | |
| 100 | [Vorboss](https://www.tamtam.ai/c/vorboss) (vorboss.com)
A dedicated fiber network provider in London offering 10Gbps minimum internet service for data-hungry businesses, recognized as a top workplace | Telecommunications | π¬π§ London | 280 | 2006 |
## 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 12, 2026.
## More company lists in the United Kingdom
- [The largest companies in the United Kingdom](https://www.tamtam.ai/l/largest-companies-united-kingdom) (36,548)
- [Multinational companies in the United Kingdom](https://www.tamtam.ai/l/multinational-companies-united-kingdom) (7,458)
- [Financial services firms in the United Kingdom](https://www.tamtam.ai/l/financial-services-firms-united-kingdom) (3,711)
- [Financial Services companies in the United Kingdom](https://www.tamtam.ai/l/financial-services-companies-united-kingdom) (3,696)
- [Retail chains in the United Kingdom](https://www.tamtam.ai/l/retail-chains-united-kingdom) (3,289)
- [Professional services firms in the United Kingdom](https://www.tamtam.ai/l/professional-services-firms-united-kingdom) (2,706)
- [Software Development companies in the United Kingdom](https://www.tamtam.ai/l/software-development-companies-united-kingdom) (2,600)
- [Manufacturers in the United Kingdom](https://www.tamtam.ai/l/manufacturers-united-kingdom) (2,159)
- [Companies with in-house R&D in the United Kingdom](https://www.tamtam.ai/l/r-and-d-companies-united-kingdom) (1,930)
- [IT Services and IT Consulting companies in the United Kingdom](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-united-kingdom) (1,722)
- [Retail companies in the United Kingdom](https://www.tamtam.ai/l/retail-companies-united-kingdom) (1,596)
- [IT services companies in the United Kingdom](https://www.tamtam.ai/l/it-services-companies-united-kingdom) (1,583)
- [Hotel and hospitality groups in the United Kingdom](https://www.tamtam.ai/l/hospitality-groups-united-kingdom) (1,461)
- [Companies with a mobile app in the United Kingdom](https://www.tamtam.ai/l/companies-with-mobile-app-united-kingdom) (1,411)
- [Consulting firms in the United Kingdom](https://www.tamtam.ai/l/consulting-firms-united-kingdom) (1,298)
- [E-commerce companies in the United Kingdom](https://www.tamtam.ai/l/ecommerce-companies-united-kingdom) (1,246)
- [Hardware manufacturers in the United Kingdom](https://www.tamtam.ai/l/hardware-companies-united-kingdom) (1,239)
- [Family-owned companies in the United Kingdom](https://www.tamtam.ai/l/family-owned-companies-united-kingdom) (1,224)
- [Hospitality companies in the United Kingdom](https://www.tamtam.ai/l/hospitality-companies-united-kingdom) (1,204)
- [Critical infrastructure operators in the United Kingdom](https://www.tamtam.ai/l/critical-infrastructure-operators-united-kingdom) (1,195)
- [Wellness and Fitness Services companies in the United Kingdom](https://www.tamtam.ai/l/wellness-and-fitness-services-companies-united-kingdom) (1,151)
- [Retail Apparel and Fashion companies in the United Kingdom](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-united-kingdom) (1,085)
- [Subscription businesses in the United Kingdom](https://www.tamtam.ai/l/subscription-businesses-united-kingdom) (1,077)
- [Distributors and wholesalers in the United Kingdom](https://www.tamtam.ai/l/distributors-and-wholesalers-united-kingdom) (1,060)
## The same list elsewhere in United Kingdom
- [Managed service providers in London](https://www.tamtam.ai/l/managed-service-providers-london) (92)
## The same list elsewhere
- [Managed service providers in the world](https://www.tamtam.ai/l/managed-service-providers-in-the-world) (3,468)
- [Managed service providers in Europe](https://www.tamtam.ai/l/managed-service-providers-in-europe) (1,750)
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Source: https://www.tamtam.ai/l/managed-service-providers-united-kingdom