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Top 100 public sector organisations in London

Tamtam tracks 104 public sector organisations headquartered in London. This list ranks the 100 largest by number of employees on LinkedIn, led by UK Civil Service, NHS England and BBC. Their median headcount is 1,743. Half of them were founded in 1995 or later.

πŸ‡¬πŸ‡§ London100 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
UK Civil Servicegov.uk

This company implements government policies, delivering essential public services in the UK

Government Administration πŸ‡¬πŸ‡§ London 238,504 n/a
2
NHS Englandengland.nhs.uk

This organization collaborates with NHS Improvement to enhance care delivery, transparency, and services for patients in England while prioritizing efficiency and accountability

Hospitals and Health Care πŸ‡¬πŸ‡§ London 59,120 2012
3
BBCbbc.co.uk

Leading public service broadcaster, creates impartial, independent, distinctive, world-class programmes and content; informs, educates, entertains millions globally.

Broadcast Media Production and Distribution πŸ‡¬πŸ‡§ London 42,697 1922
4
Department for Work and Pensions (DWP)gov.uk

The company is responsible for welfare, pensions, child maintenance, and benefits, aiming to reduce poverty, promote work, and ensure financial security for all

Government Administration πŸ‡¬πŸ‡§ London 33,465 1948
5
UK Ministry of Defencegov.uk

The company works to protect the security and interests of the United Kingdom, providing necessary training, equipment, and support for the Armed Forces

Defense and Space Manufacturing πŸ‡¬πŸ‡§ London 30,901 n/a
6
Ministry of Justice UKgov.uk

Government department responsible for justice system administration, legal affairs, courts, prisons, and public safety in the United Kingdom.

Government Administration πŸ‡¬πŸ‡§ London 20,603 2007
7
Transport for Londontfl.gov.uk

London-based transportation company leading in providing diverse travel options, focusing on customer feedback, technology innovation, and large-scale investments for city-wide mobility improvements

Non-profit Organizations πŸ‡¬πŸ‡§ London 18,658 2000
8
Post Office Ltdpostoffice.co.uk

operates largest UK retail network with 11,500 branches and a major digital presence, focusing on customer service and innovation

Retail πŸ‡¬πŸ‡§ London 17,058 n/a
9
Guy's and St Thomas'​ NHS Foundation Trustguysandstthomas.nhs.uk

Provides high-quality healthcare services, clinical excellence, research, and community care through multiple hospitals and partnerships in London.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 11,655 n/a
10
Barts Health NHS Trustbartshealth.nhs.uk

Managing five London hospitals including specialist heart and cancer services while providing safe quality medical care for diverse and deprived local communities.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 10,093 2012
11
BBC Newsbbc.com

Global provider of trusted, accurate, and impartial news through TV, radio, online, and social media with extensive journalist network.

Broadcast Media Production and Distribution πŸ‡¬πŸ‡§ London 9,410 1922
12
Imperial College Healthcare NHS Trustimperial.nhs.uk

Delivers acute and specialist medical care, conducts biomedical research, and provides clinical education for healthcare professionals across five London hospital sites.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 7,248 1823
13
House of Commonsparliament.uk

This company supports and educates on the functions of elected MPs in representing the public, legislating, and scrutinizing the Government

Political Organizations πŸ‡¬πŸ‡§ London 6,657 1327
14
King's College Hospital NHS Foundation Trustkch.nhs.uk

A large and busy Trust providing care to 1 million people, with a commitment to excellence and a global reach strategy in place

Hospitals and Health Care πŸ‡¬πŸ‡§ London 6,425 1913
15
BBC Studiosbbcstudios.com

BBC Studios is a leading content studio and channels & streaming business known for top-quality, award-winning shows and global distribution of British content

Broadcast Media Production and Distribution πŸ‡¬πŸ‡§ London 6,277 1995
16
Bank of Englandbankofengland.co.uk

Maintains monetary and financial stability to promote the public good and benefit of the people in the United Kingdom.

Banking πŸ‡¬πŸ‡§ London 5,947 1694
17
Royal Free London NHS Foundation Trustroyalfree.nhs.uk

A leading London NHS Trust providing high-quality healthcare across three hospitals, focusing on clinical excellence, research, and patient-centered care

Hospitals and Health Care πŸ‡¬πŸ‡§ London 5,782 1828
18
University College London Hospitals NHS Foundation Trustuclh.nhs.uk

Provides acute and specialist medical services across six London hospitals, focusing on patient care, education, and biomedical research.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 5,737 n/a
19
HM Courts & Tribunals Service (HMCTS)gov.uk

This organization oversees the administration of courts and tribunals in England, Wales, Scotland, and Northern Ireland, ensuring fair and efficient access to justice

Government Administration πŸ‡¬πŸ‡§ London 5,284 2011
20
EBRDebrd.com

The company focuses on building sustainable economies, supporting countries affected by war, promoting equality, and leveraging digital technology for positive change

Banking πŸ‡¬πŸ‡§ London 4,789 1991
21
Civil Aviation Authoritycaa.co.uk

Regulation and oversight of aviation safety, consumer protection through ATOL, development of aviation technology and environmental standards.

Airlines and Aviation πŸ‡¬πŸ‡§ London 4,334 1972
22
Thames Valley District School Boardtvdsb.ca

A public school board serving a diverse region in Ontario, focused on progressive growth, student achievement, equity, and community partnerships

Primary and Secondary Education πŸ‡¬πŸ‡§ London 4,232 1998
23
North London NHS Foundation Trustnorthlondonmentalhealth.nhs.uk

Providing community-based and inpatient mental health care services across North London boroughs, supporting local and wider populations.

Mental Health Care πŸ‡¬πŸ‡§ London 3,983 2024
24
Great Ormond Street Hospital for Children NHS Foundation Trustgosh.nhs.uk

National centre providing specialist healthcare for children with complex, rare, and congenital conditions, focusing on research and teaching partnerships.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 3,938 n/a
25
Central and North West London NHS Foundation Trustcnwl.nhs.uk

Integrated healthcare provider in Central and North West London, also serving Milton Keynes, Surrey, and beyond Offers diverse services for various health needs

Hospitals and Health Care πŸ‡¬πŸ‡§ London 3,898 n/a
26
Dorchester Collectiondorchestercollection.com

Collection of luxury hotels and residences known for unique character, cultural significance, and providing sophisticated, legendary guest experiences worldwide.

Hospitality πŸ‡¬πŸ‡§ London 3,763 2007
27
East London NHS Foundation Trustelft.nhs.uk

Provider of mental health care, innovation, and improvement services in East London and beyond Earning awards and striving for excellence

Hospitals and Health Care πŸ‡¬πŸ‡§ London 3,749 2000
28
Chelsea and Westminster Hospital NHS Foundation Trustchelwest.nhs.uk

A NHS Foundation Trust running two hospitals and community services, providing outstanding healthcare to a million people with innovative outreach programs

Hospitals and Health Care πŸ‡¬πŸ‡§ London 3,504 1993
29
UK Health Security Agencywww.gov.uk

The company is an executive agency responsible for planning, preventing, and responding to external health threats at national and global levels

Hospitals and Health Care πŸ‡¬πŸ‡§ London 3,430 2021
30
London Borough of Lambethbeacons.ai

Providing planning, social work, housing, and education services to a diverse community of over 300,000 residents and businesses.

Government Administration πŸ‡¬πŸ‡§ London 3,148 1965
31
Islington Councilislington.gov.uk

Local government focused on affordable housing, job investment, environmental health, youth development, and fostering safe, inclusive community connections.

Government Administration πŸ‡¬πŸ‡§ London 2,986 1963
32
Richmond and Wandsworth Councilsjobs.richmondandwandsworth.gov.uk

Deliver high-quality public services across two London boroughs, supporting communities through innovation, collaboration, and adapting to change.

Government Administration πŸ‡¬πŸ‡§ London 2,965 n/a
33
The Royal Marsden NHS Foundation Trustroyalmarsden.nhs.uk

Cancer diagnosis, treatment, research, and education, operating two hospitals in London and Surrey, and partnering with The Institute of Cancer Research.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 2,930 1851
34
London Fire Brigadelondon-fire.gov.uk

Full-time firefighters and support staff protect people and property from fire across Greater London, operating 24/7 emergency response system.

Public Safety πŸ‡¬πŸ‡§ London 2,894 1866
35
Care Quality Commissioncqc.org.uk

Independent regulator ensuring safe, effective, compassionate, and high-quality health and adult social care services in England.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 2,847 n/a
36
Channel 4channel4.com

Free-to-air UK broadcaster offering multiple TV channels and streaming, commissioning independent content, focusing on young audiences and British film investment.

Broadcast Media Production and Distribution πŸ‡¬πŸ‡§ London 2,807 1982
37
London Ambulance Service NHS Trustlondonambulance.nhs.uk

This company is the busiest emergency ambulance service in the UK, providing free emergency and urgent healthcare in London

Hospitals and Health Care πŸ‡¬πŸ‡§ London 2,724 n/a
38
Lewisham and Greenwich NHS Trustlewishamandgreenwich.nhs.uk

Healthcare provider serving over 666,000 people across three boroughs, offering quality care, innovative services, and support for staff well-being and development

Hospitals and Health Care πŸ‡¬πŸ‡§ London 2,668 2013
39
South Western Railwaysouthwesternrailway.com

A train company focused on improving customer experience through investments in new trains, station upgrades, and ticket options

Rail Transportation πŸ‡¬πŸ‡§ London 2,647 2017
40
HM Treasurygov.uk

Government ministry responsible for managing public spending and shaping UK economic policy direction

Public Policy Offices πŸ‡¬πŸ‡§ London 2,260 1066
41
Whittington Healthwhittington.nhs.uk

Integrated care organization providing hospital and community services to 500,000 people in north London, focusing on delivering personalized, coordinated, and high-quality healthcare

Hospitals and Health Care πŸ‡¬πŸ‡§ London 2,173 n/a
42
Royal Brompton and Harefield hospitalsrbht.nhs.uk

Largest UK centre specializing in advanced heart and lung treatments, surgeries, and research, attracting patients and experts worldwide.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 2,094 n/a
43
Moorfields Eye Hospital, Londonmoorfields.nhs.uk

A leading eye hospital in London providing clinical care, research, and education, treating a wide range of eye conditions and conducting ophthalmic research

Hospitals and Health Care πŸ‡¬πŸ‡§ London 2,054 1804
44
British Transport Policebtp.police.uk

national police force ensuring safety and security across railways, underground, trams, and cable car systems during passenger journeys

Law Enforcement πŸ‡¬πŸ‡§ London 2,039 1948
45
Southeastern Railwaysoutheasternrailway.co.uk

A transportation company operating train services into London from Kent and East Sussex, with a large network and high-speed trains

Rail Transportation πŸ‡¬πŸ‡§ London 2,039 2006
46
Royal Borough of Kensington and Chelsearbkc.gov.uk

The organization aims to provide high-quality services in Kensington and Chelsea to improve residents' lives, environment, housing, and community resources

Government Administration πŸ‡¬πŸ‡§ London 1,968 n/a
47
South West London and St George's Mental Health NHS Trustswlstg.nhs.uk

Provider of mental health services in south west London, with a staff of over 2,000 serving 11 million people Offers care, treatment, education, and research partnerships

Mental Health Care πŸ‡¬πŸ‡§ London 1,878 n/a
48
Central London Community Healthcare NHS Trustclch.nhs.uk

A leading community healthcare organisation providing services across London and Hertfordshire, focused on supporting patients to live healthier lives at home

Hospitals and Health Care πŸ‡¬πŸ‡§ London 1,855 2010
49
UK National Audit Officenao.org.uk

Independent public spending watchdog in the UK, supporting Parliament in holding government accountable and improving public services through high-quality audits

Government Administration πŸ‡¬πŸ‡§ London 1,760 1983
50
Tatetate.org.uk

A public institution with four major galleries showcasing British and international art to increase public enjoyment and understanding

Museums, Historical Sites, and Zoos πŸ‡¬πŸ‡§ London 1,743 1897
51
Greater London Authoritylondon.gov.uk

Strategic authority implementing mayoral policies, supporting assembly oversight, managing finance, communities, growth, housing, resources, and communications for London.

Government Administration πŸ‡¬πŸ‡§ London 1,737 1999
52
Natural History Museumnhm.ac.uk

The company is a leading science research center and visitor attraction with vast collections, expertise, and a mission to tackle global challenges

Museums, Historical Sites, and Zoos πŸ‡¬πŸ‡§ London 1,731 1881
53
Medicines and Healthcare products Regulatory Agencygov.uk

Regulating medicines and medical devices to improve health, supported by science and research, with career opportunities in central London and Hertfordshire

Government Administration πŸ‡¬πŸ‡§ London 1,718 n/a
54
Ofcomofcom.org.uk

Regulating UK communications, ensuring fair home phone and mobile services, overseeing TV, radio, and content, protecting consumers, promoting access to technology

Telecommunications πŸ‡¬πŸ‡§ London 1,700 2003
55
North Middlesex University Hospital NHS Trustnorthmid.nhs.uk

A busy acute hospital in London providing a wide range of medical services and specialist care, including cancer treatment and support services

Hospitals and Health Care πŸ‡¬πŸ‡§ London 1,488 1910
56
Royal Marinesroyalnavy.mod.uk

An elite fighting force within the Royal Navy, specializing in rapid response to global threats and security challenges, including ship-to-ship operations

Armed Forces πŸ‡¬πŸ‡§ London 1,423 1664
57
Capital City Collegecapitalccg.ac.uk

London's largest further education college group offering exceptional education, training for students and businesses through popular colleges and bespoke training programs

Education πŸ‡¬πŸ‡§ London 1,403 2016
58
Victoria and Albert Museumvam.ac.uk

Museum family promoting creativity and design through exhibitions, education, conservation, research, and a vast collection spanning 5,000 years.

Museums, Historical Sites, and Zoos πŸ‡¬πŸ‡§ London 1,402 1852
59
National Crime Agency (NCA)nationalcrimeagency.gov.uk

The company is focused on protecting the public from serious and organized crime by targeting and pursuing high-risk criminals in the UK

Law Enforcement πŸ‡¬πŸ‡§ London 1,363 2013
60
The British Librarybl.uk

National library providing access to over 170 million items including historical documents, contemporary media, and digital content for inspiration and research.

Libraries πŸ‡¬πŸ‡§ London 1,326 1973
61
The British Museumbritishmuseum.org

Museum preserving and exhibiting global cultural artifacts, offering educational exhibitions and events to engage millions of visitors annually.

Museums, Historical Sites, and Zoos πŸ‡¬πŸ‡§ London 1,321 1753
62
Cafcass (Children and Family Court Advisory and Support Service)cafcass.gov.uk

Cafcass represents children in family court cases, advocating for their safety and best interests, ensuring their voices are heard and welfare is safeguarded

Civic and Social Organizations πŸ‡¬πŸ‡§ London 1,282 2001
63
Historic Englandhistoricengland.org.uk

This organization protects and celebrates England's historic environment, working with communities to inspire interest, care, and conservation for future generations

Government Administration πŸ‡¬πŸ‡§ London 1,278 2015
64
NICE - National Institute for Health and Care Excellencenice.org.uk

Independent assessment and guidance development for health and social care professionals to improve outcomes and promote best practices.

Public Policy Offices πŸ‡¬πŸ‡§ London 1,231 1999
65
Acasacas.org.uk

Impartial experts providing information, training, and dispute resolution services to support good employer-employee relationships and ensure compliance with UK employment laws.

Government Relations Services πŸ‡¬πŸ‡§ London 1,081 1975
66
The Crown Estatethecrownestate.co.uk

Managing diverse land, property, and seabed assets across the UK, supporting sustainability, economic growth, and returning profits to government.

Real Estate πŸ‡¬πŸ‡§ London 1,044 1961
67
Science Museum Groupsciencemuseumgroup.org.uk

A group operating multiple museums focusing on science, technology, engineering, and medicine using a national collection to inspire visitors

Museums, Historical Sites, and Zoos πŸ‡¬πŸ‡§ London 960 1909
68
Barnet Enfield and Haringey Mental Health NHS Trustnorthlondonmentalhealth.nhs.uk

Provider of integrated mental health and community health services in Barnet, Enfield, and Haringey, serving 12 million people with over 3,300 staff across 20 sites

Hospitals and Health Care πŸ‡¬πŸ‡§ London 946 2001
69
College of Policingcollege.police.uk

Setting police standards, accrediting training, promoting best practices, supporting partnerships, and leading ethics and integrity in policing.

Law Enforcement πŸ‡¬πŸ‡§ London 888 2012
70
Sport Englandsportengland.org

Promoting inclusivity in sports and physical activities by utilizing funds from the Government and The National Lottery to support participation for all

Spectator Sports πŸ‡¬πŸ‡§ London 876 1996
71
General Pharmaceutical Council (GPhC)pharmacyregulation.org

An independent regulator ensuring safe and effective care in pharmacy services by setting standards, inspecting pharmacies, and protecting public confidence

Public Safety πŸ‡¬πŸ‡§ London 875 2010
72
The Insolvency Servicegov.uk

The company provides a framework for dealing with financial failure and misconduct, maintains insolvency laws, delivers public services, and enforces regulations

Government Administration πŸ‡¬πŸ‡§ London 858 n/a
73
Security Industry Authoritywww.gov.uk

Regulating the private security industry in the UK by licensing individuals and managing the Approved Contractor Scheme to ensure high standards

Government Administration πŸ‡¬πŸ‡§ London 836 2003
74
Assala Energyassalaenergy.com

An energy company in Africa focused on acquiring mature oil and gas assets, increasing production and reserves through field redevelopment

Oil and Gas πŸ‡¬πŸ‡§ London 776 2017
75
City of London Policecityoflondon.police.uk

Policing a unique financial district with focus on preventing crime, tackling fraud, and ensuring business continuity in a global center.

Law Enforcement πŸ‡¬πŸ‡§ London 753 n/a
76
Imperial War Museumsiwm.org.uk

The company tells the stories of people involved in conflicts, explores war causes and impacts, and engages audiences worldwide through various platforms

Museums, Historical Sites, and Zoos πŸ‡¬πŸ‡§ London 753 1917
77
The National Lottery Community Fundtnlcommunityfund.org.uk

Distributor of National Lottery funding supporting community-led projects for resilient, inclusive, and sustainable communities across the UK

Non-profit Organizations πŸ‡¬πŸ‡§ London 740 n/a
78
British International Investmentbii.co.uk

A UK-based development finance institution and impact investor, partnering with businesses in Africa, Asia, and the Caribbean to create inclusive economies

Financial Services πŸ‡¬πŸ‡§ London 706 n/a
79
The Tavistock and Portman NHS Foundation Trusttavistockandportman.ac.uk

Specialist mental health trust offering services for children, families, young people, and adults, along with academic training, research, and consultancy

Mental Health Care πŸ‡¬πŸ‡§ London 701 n/a
80
SEFE Marketing & Trading Ltdsefe-mt.com

Leading European energy trading company offering physical & financial trading of LNG, gas, power, environmental products, and hydrogen with risk management services

Oil and Gas πŸ‡¬πŸ‡§ London 643 n/a
81
NHS Resolutionresolution.nhs.uk

An arm's length body of the Department of Health and Social Care providing expertise to the NHS in claims management, performance advice, and contracting dispute resolution

Hospitals and Health Care πŸ‡¬πŸ‡§ London 608 1995
82
The National Gallerynationalgallery.org.uk

A prestigious institution housing Western European paintings from the 13th to 19th centuries, striving for excellence in collection care, access, and education

Museums, Historical Sites, and Zoos πŸ‡¬πŸ‡§ London 598 1824
83
UK Export Financeukexportfinance.gov.uk

Support UK companies with finance and insurance to secure, complete, and receive payment for export contracts sustainably and cost-effectively.

Financial Services πŸ‡¬πŸ‡§ London 590 1919
84
Genomics Englandgenomicsengland.co.uk

collaboration with NHS to integrate genomic testing into routine healthcare, supporting research and development of targeted medicines

Biotechnology Research πŸ‡¬πŸ‡§ London 566 2013
85
General Dental Councilgdc-uk.org

Regulating dental professionals in the UK, ensuring high standards, quality education, updated practices, and protecting patient rights through registration and complaints support

Public Safety πŸ‡¬πŸ‡§ London 558 1956
86
Tube Linestfl.gov.uk

Maintenance and upgrade of infrastructure on Jubilee, Northern, Piccadilly lines, including tracks, trains, stations, and safety services.

Truck Transportation πŸ‡¬πŸ‡§ London 552 n/a
87
Nest Pensionsnestpensions.org.uk

Established in 2010, this UK company provides a low-cost pension scheme to help individuals save for retirement with high quality services and investment solutions

Financial Services πŸ‡¬πŸ‡§ London 499 2010
88
London & Partnerslondonandpartners.com

Promotes London business growth through innovation announcements, business launches, expansions, news, free events, and reports.

International Trade and Development πŸ‡¬πŸ‡§ London 427 2011
89
NS&Insandi-corporate.com

A leading UK savings provider with unique government backing, aiming to become the most trusted in the country through innovation

Financial Services πŸ‡¬πŸ‡§ London 405 1861
90
Financial Services Compensation Schemefscs.org.uk

The company offers a reliable compensation service to enhance trust in the financial services sector

Financial Services πŸ‡¬πŸ‡§ London 369 2008
91
Digital Catapultdigicatapult.org.uk

Accelerate deep technology adoption by partnering with businesses, investors, and academia to create market pathways and support UK innovation growth.

Software Development πŸ‡¬πŸ‡§ London 307 2013
92
LPPIlppi.co.uk

Investment management and pension services provider for local government and public sector pension schemes, focusing on reducing deficits and improving returns.

Investment Management πŸ‡¬πŸ‡§ London 222 2015
93
Westminster Adult Education Servicewaes.ac.uk

Provides diverse adult education courses including Art, Health, Social Care, and ESOL with flexible study options and community partnerships.

Higher Education πŸ‡¬πŸ‡§ London 167 n/a
94
London Stadiumlondon-stadium.com

Transformed London Stadium into a versatile venue for music, sports, and entertainment, creating a world-class environment to bring fans together

Spectator Sports πŸ‡¬πŸ‡§ London 141 2009
95
CDC Group plcbii.co.uk

A company specializing in international investments, providing services in various financial sectors with a focus on British markets

Financial Services πŸ‡¬πŸ‡§ London 127 1948
96
London LGPS CIV Limitedlondonciv.org.uk

manages and pools local government pension scheme assets to achieve economies of scale, efficiency, and improved investment performance

Investment Management πŸ‡¬πŸ‡§ London 75 2015
97
China Taiping Insurance (UK) Co Ltduk.cntaiping.com

Underwriting general insurance and reinsurance policies, specializing in property, accident, liability, marine, and aviation insurance for UK and European markets.

Insurance πŸ‡¬πŸ‡§ London 57 1985
98
London Pensions Fund Authoritylpfa.org.uk

Management of a defined benefit pension fund with extensive assets, active in sustainable investment and collaboration with public sector pension networks.

Investment Management πŸ‡¬πŸ‡§ London 36 2016
99
Start Up Loans Companystartuploans.co.uk

Provide government-backed personal loans up to Β£25,000 with fixed interest and free mentoring to help UK startups grow successfully.

Financial Services πŸ‡¬πŸ‡§ London 34 2012
100
London Treasurylondontreasury.org

A London-based investment manager specializing in ultra short fixed income and GBP-denominated alternatives for the Greater London Authority and its partners

Financial Services πŸ‡¬πŸ‡§ London 30 2017

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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 Oct 24, 2026.

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