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Top 100 critical infrastructure operators in the United Kingdom

Tamtam tracks 935 critical infrastructure operators headquartered in the United Kingdom. This list ranks the 100 largest by number of employees on LinkedIn, led by NHS, Shell and HSBC. Their median headcount is 7,756. Half of them were founded in 1991 or later. The most common headquarters are London (53), Reading (4) and Edinburgh (3).

πŸ‡¬πŸ‡§ United Kingdom100 companiesUpdated Oct 24, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
NHSwww.nhs.uk

It provides comprehensive healthcare services to UK residents, employing over 1.5 million staff and ensuring free access at the point of use.

Food and Beverage Services πŸ‡¬πŸ‡§ 252,871 1948
2
Shellshell.com

A global energy company with a focus on cleaner energy solutions, serving millions of customers through retail service stations worldwide

Oil and Gas πŸ‡¬πŸ‡§ London 208,511 n/a
3
HSBChsbc.com

A global financial services organization with a network spanning 63 countries, serving individuals, companies, and governments, creating opportunities for customers worldwide

Financial Services πŸ‡¬πŸ‡§ London 197,879 n/a
4
Vodafonevodafone.com

Using technology to connect people globally, drive social change, and improve lives while emphasizing the importance of humanity and collaboration

Telecommunications πŸ‡¬πŸ‡§ London 142,740 1982
5
bpbp.com

Investing in a balanced energy system by transitioning from oil and gas to lower-carbon energy, convenience stores, and power trading

Oil and Gas πŸ‡¬πŸ‡§ London 85,000 1909
6
Barclayshome.barclays

A British universal bank with global presence, offering consumer banking, payments, corporate and investment banking services, supported by technology and operational solutions

Financial Services πŸ‡¬πŸ‡§ London 82,417 n/a
7
Standard Charteredsc.com

An international banking group with a presence in 53 markets, driving commerce and prosperity through diversity and values Listed on London and Hong Kong Stock Exchanges

Banking πŸ‡¬πŸ‡§ London 79,401 n/a
8
BT Groupbt.com

A global communications services company connecting people through technology to address challenges like the pandemic, climate change, and cyber security

Telecommunications πŸ‡¬πŸ‡§ London 73,712 n/a
9
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
10
Lloyds Banking Grouplloydsbankinggroup.com

This company focuses on creating a more sustainable and inclusive future in the financial services industry, while supporting customers' changing needs

Financial Services πŸ‡¬πŸ‡§ London 57,702 n/a
11
NatWest Groupnatwestgroup.com

Support UK businesses by removing barriers, promoting learning, enhancing financial confidence, and championing climate solutions for sustainable community growth.

Banking πŸ‡¬πŸ‡§ Edinburgh 43,833 n/a
12
Royal Maillinktr.ee

Connecting businesses, customers, and communities in the UK by providing universal postal service to over 29 million addresses, aiming to be the best delivery company in Europe

Freight and Package Transportation πŸ‡¬πŸ‡§ London 39,215 n/a
13
Avivaaviva.com

This company prioritizes their people, striving to create an inclusive workplace with market-leading benefits for employees and a strong connection to customers and communities

Insurance πŸ‡¬πŸ‡§ London 36,000 1696
14
Skysky.com

A leading media and entertainment company offering innovative TV, streaming services, connectivity solutions, premium content production, and societal impact initiatives

Broadcast Media Production and Distribution πŸ‡¬πŸ‡§ Middlesex 35,346 1989
15
Network Railnetworkrail.co.uk

Managing and modernising Britain's railway infrastructure to ensure safe, reliable transport for passengers and freight, supporting economic growth.

Rail Transportation πŸ‡¬πŸ‡§ Milton Keynes 28,033 n/a
16
Boots UKboots.jobs

Leading UK pharmacy-led retailer offering health, beauty products & care services through retail stores, digital platforms, and exclusive brands for over 170 years

Retail πŸ‡¬πŸ‡§ Nottingham 27,869 1849
17
LSEGlseg.com

Provides financial indexing, benchmarking, analytic services, technology solutions, and integrated market infrastructure across data, capital markets, and post-trade.

Financial Services πŸ‡¬πŸ‡§ London 25,298 n/a
18
Santander UKsantander.co.uk

Providing personal and commercial financial products and services to millions of customers, fostering diversity and a positive workplace culture.

Banking πŸ‡¬πŸ‡§ London 21,000 n/a
19
Bupa UKbupa.co.uk

International healthcare company dedicated to helping people live longer, healthier, happier lives by providing quality healthcare services to over 38 million customers worldwide

Hospitals and Health Care πŸ‡¬πŸ‡§ London 20,537 1947
20
Menzies Aviationmenziesaviation.com

Providing ground handling, air cargo, and fueling services worldwide, ensuring safety, precision, and continuous support in aviation operations.

Airlines and Aviation πŸ‡¬πŸ‡§ London 18,695 1833
21
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
22
Revolutrevolut.com

A fintech company on a mission to provide customers with more visibility, control, and freedom over their money through innovative products

Financial Services πŸ‡¬πŸ‡§ London 18,462 2015
23
RBSnatwestgroup.com

Announcement of rebranding from RBS to NatWest Group, encouraging followers to transition to the new company page for updates.

Banking πŸ‡¬πŸ‡§ Gogarburn 18,457 n/a
24
Centricacentrica.com

A leading energy services provider with a focus on sustainability, offering zero carbon electricity to millions of customers through various brands

Utilities πŸ‡¬πŸ‡§ Windsor 18,164 n/a
25
National Gridnationalgrid.com

Operate and develop electricity transmission and distribution networks, natural gas systems, and invest in clean energy infrastructure and technology ventures.

Utilities πŸ‡¬πŸ‡§ London 17,432 n/a
26
Openreachopenreach.com

This company is the UK's digital network business, connecting homes, businesses, and more to the world with a focus on high-quality service

Telecommunications πŸ‡¬πŸ‡§ London 16,885 n/a
27
Babcock International Groupbabcockinternational.com

An international defence company providing product and service solutions to enhance customers' capabilities and assets, offering opportunities for professionals to grow

Defense and Space Manufacturing πŸ‡¬πŸ‡§ London 16,474 n/a
28
Nationwide Building Societynationwide.co.uk

Providing reliable and customer-focused banking services, offering financial products and support to meet everyday banking needs effectively.

Financial Services πŸ‡¬πŸ‡§ Swindon 14,486 1846
29
easyJeteasyjet.com

Mission-driven to make low-cost travel accessible with Europe's best airline network, value fares, and personalized service, fostering a supportive, opportunity-driven culture

Airlines and Aviation πŸ‡¬πŸ‡§ London Luton Airport 13,948 1995
30
Liverpool University Hospitals NHS Foundation Trustuhliverpool.nhs.uk

Provides general hospital, specialist, cancer, dental, and community healthcare services, including major trauma care for Cheshire and Merseyside.

Hospitals and Health Care πŸ‡¬πŸ‡§ Liverpool 13,000 2019
31
SSE plcsse.com

The company is focused on investing in a cleaner, more affordable, and secure energy system to drive positive change in the industry

Utilities πŸ‡¬πŸ‡§ Perth 12,865 n/a
32
Bank of Communications Co., Ltd. London Branchbankcomm.com.hk

Provides commercial banking, securities, trust services, financial leasing, fund management, and insurance through a vast network of domestic branches and international overseas institutions.

Banking πŸ‡¬πŸ‡§ 12,670 1908
33
EEee.co.uk

A leading mobile communications company in the UK, offering mobile and fixed services with the largest and fastest network coverage

Telecommunications πŸ‡¬πŸ‡§ London 12,146 2012
34
Wisewise.com

Platform enabling individuals and businesses to hold multiple currencies, transfer money internationally, and spend abroad with low fees.

Financial Services πŸ‡¬πŸ‡§ London 11,769 2011
35
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
36
Ameyamey.com

A leading provider of engineering, operations, and decarbonisation solutions for transport infrastructure and complex facilities, focusing on sustainability and resilience

Civil Engineering πŸ‡¬πŸ‡§ London 11,000 n/a
37
AXA XLaxaxl.com

Specializing in solving complex risks, this division provides innovative insurance solutions for mid-sized companies, multinational corporations, and individuals

Insurance πŸ‡¬πŸ‡§ Hamilton 10,917 n/a
38
British Gasbritishgas.co.uk

Providing affordable energy services and support to millions of UK homes and businesses, focusing on saving energy and money.

Utilities πŸ‡¬πŸ‡§ Windsor 10,311 1997
39
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
40
Barclays UKsearch.jobs.barclays

A company focused on helping individuals progress in their lives through financial services, digital innovation, career guidance, and customer-centric approach

Banking πŸ‡¬πŸ‡§ London 9,925 1690
41
Investecinvestec.com

Provides global banking and asset management services, creating and managing wealth through specialized financial solutions and insights for diverse international clients.

Financial Services πŸ‡¬πŸ‡§ London 9,732 1974
42
Nuffield Healthnuffieldhealth.com

Leading UK not-for-profit healthcare organization, investing all income back into hospitals, fitness clubs, and wellbeing services to build a healthier nation.

Wellness and Fitness Services πŸ‡¬πŸ‡§ London 9,066 n/a
43
RSAintactinsurance.co.uk

A multinational insurer with a 300-year heritage, operating across Europe with significant businesses in the UK, Ireland, and Luxembourg Employing over 4,500 people

Insurance πŸ‡¬πŸ‡§ London 8,918 n/a
44
Jet2.com and Jet2holidaysjet2careers.com

A leisure flight and package holiday operator with over 40 years of success, offering great value and service across Europe

Airlines and Aviation πŸ‡¬πŸ‡§ Leeds 8,917 2002
45
EDF (UK)edfenergy.com

Leading sustainable energy transition, building nuclear power, investing in renewables like wind and solar, and electrifying homes and businesses with low-carbon technology.

Utilities πŸ‡¬πŸ‡§ London 8,774 2003
46
Allianz UKallianz.co.uk

Global financial services provider offering commercial and personal insurance products through brokers, focusing on employee growth, diversity, and sustainability for a better future

Insurance πŸ‡¬πŸ‡§ Guildford 8,735 n/a
47
Virgin Media O2virginmediao2.co.uk

Provides fastest broadband and largest mobile network in the UK, focusing on customer-first connectivity services and network upgrades.

Telecommunications πŸ‡¬πŸ‡§ London 8,272 2021
48
Vodafone Businessvodafone.com

Providing mobile, fixed, unified communications, IoT, cloud, and security services to businesses globally, regionally, and locally.

Telecommunications πŸ‡¬πŸ‡§ London 8,100 n/a
49
Legal & Generallegalandgeneral.com

Provides financial services through asset management, pension risk transfers, and retail savings while investing capital responsibly to deliver long-term shareholder returns.

Financial Services πŸ‡¬πŸ‡§ London 7,832 n/a
50
Virgin Atlanticvirginatlantic.com

Operate transatlantic flights connecting major global cities, focus on customer experience, sustainability, inclusivity, and innovative travel solutions.

Airlines and Aviation πŸ‡¬πŸ‡§ Crawley 7,756 1984
51
Virgin Mediajobs.virginmediao2.co.uk

Providing ultrafast broadband and fibre optic network services to connect millions of homes and businesses with reliable internet access.

Telecommunications πŸ‡¬πŸ‡§ Reading 7,691 n/a
52
TP ICAPtpicap.com

Specialist in connecting clients to liquidity and data solutions across financial and commodities markets with advanced technology and global presence.

Financial Services πŸ‡¬πŸ‡§ Liverpool Street 7,548 n/a
53
NHS Greater Glasgow and Clydenhsggc.scot

Provider of NHS health care services serving 12 million people in Glasgow and half of Scotland's population, with 25 hospitals and a Β£842m investment program

Hospitals and Health Care πŸ‡¬πŸ‡§ Glasgow 7,466 1948
54
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
55
Manchester University NHS Foundation Trustmft.nhs.uk

A large UK acute Trust with nine hospitals providing comprehensive general to highly specialized services to 750,000 people in Manchester and Trafford

Hospitals and Health Care πŸ‡¬πŸ‡§ Manchester 7,150 n/a
56
NatWestnatwest.com

Provides comprehensive banking services to personal, small business, and SME customers, supports the UK economy through lending to businesses, and fosters entrepreneurship.

Banking πŸ‡¬πŸ‡§ 7,041 n/a
57
NHS Lothiannhslothian.scot

Provider of primary, community-based, and acute hospital services in Edinburgh and surrounding areas, offering comprehensive healthcare to local populations

Hospitals and Health Care πŸ‡¬πŸ‡§ Edinburgh 7,007 n/a
58
Thames Waterthameswater.co.uk

Providing clean water and wastewater services to millions, maintaining infrastructure, ensuring quality, investing in sustainability and community education.

Utilities πŸ‡¬πŸ‡§ Reading 7,000 n/a
59
Severn Trentseverntrent.com

Provision of clean water and safe wastewater removal for homes, schools, businesses, and hospitals, focusing on community care and quality service.

Utilities πŸ‡¬πŸ‡§ Coventry 7,000 1974
60
Perencoperenco.com

An independent hydrocarbon producer, involved in the entire lifecycle of projects, from exploration to decommissioning, operating globally with a strong team.

Oil and Gas πŸ‡¬πŸ‡§ London 6,910 1992
61
Mobico Group PLCmobicogroup.com

A leading international transport provider operating in 11 countries, promoting safe, affordable, and reliable public transport for the benefit of the planet

Truck Transportation πŸ‡¬πŸ‡§ England 6,835 n/a
62
Leeds Teaching Hospitals NHS Trustleedsth.nhs.uk

One of Europe's largest acute hospital trusts in Leeds, providing healthcare, specialist services, training, research, and pioneering treatments with 20,000 employees

Hospitals and Health Care πŸ‡¬πŸ‡§ Leeds 6,812 1948
63
Spire Healthcare Group plcspirehealthcare.com

Leading provider of private healthcare services operating 38 hospitals and over 50 clinics, consulting rooms, and medical centres in the UK.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 6,621 2007
64
Coventry Building Societycoventrycareers.co.uk

Financial institution offering diverse career opportunities, focusing on member-first service, innovation, and promoting equality, diversity, and inclusion.

Banking πŸ‡¬πŸ‡§ Coventry 6,612 1884
65
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
66
Three UKthreev1-1481200-gb-engb.sr-attrax.com

Provides mobile network services, including 3G, 4G, and 5G, covering 99% of the UK outdoor population and sponsoring Chelsea FC.

Telecommunications πŸ‡¬πŸ‡§ Reading 6,239 2003
67
Lloyds Banklloydsbank.com

A UK-based bank focusing on serving the needs of individuals and businesses, prioritizing what truly matters in life Connect with us online

Banking πŸ‡¬πŸ‡§ London 5,996 n/a
68
Heathrowheathrow.com

Europe's largest airport connecting over 80 airlines, passengers, businesses, and cargo to more than 200 global destinations.

Airlines and Aviation πŸ‡¬πŸ‡§ Hounslow 5,968 1946
69
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
70
National Highwaysnationalhighways.co.uk

Government company managing, maintaining, and modernising motorways and main A roads to ensure smooth traffic flow nationwide.

Civil Engineering πŸ‡¬πŸ‡§ Birmingham 5,889 2015
71
Barchester Healthcarejobs.barchester.com

Operate over 260 care homes and six hospitals across the UK, delivering high-quality, person-centred care to thousands daily.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 5,859 1992
72
Care UKcareuk.com

Award-winning provider of care services, specializing in supporting over 7,000 individuals to live active and fulfilling lives in safe, comfortable environments

Hospitals and Health Care πŸ‡¬πŸ‡§ Colchester 5,843 1982
73
Circle Health Groupcirclehealthgroup.co.uk

Operates UK's largest private hospital group, providing over 500 treatments across 60 specialties with personalized patient care and expert consultants.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 5,791 n/a
74
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
75
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
76
Stagecoach Group Limitedstagecoachbus.com

Market leader in providing greener, smarter travel through bus, coach, and tram operations Committed to safety, service, integrity, innovation, and partnership

Interurban and Rural Bus Services πŸ‡¬πŸ‡§ Perth 5,660 n/a
77
Aberdeenaberdeenplc.com

Providing wealth and investment services focused on helping clients plan, manage portfolios, and navigate financial futures with insight.

Financial Services πŸ‡¬πŸ‡§ Edinburgh 5,527 n/a
78
University Hospitals Birmingham NHS Foundation Trustuhb.nhs.uk

Operates large teaching hospitals, providing comprehensive medical care, specialist treatments, and trauma services for millions regionally and internationally, with a focus on staff development.

Hospitals and Health Care πŸ‡¬πŸ‡§ Birmingham 5,525 n/a
79
Priorypriorygroup.com

A leading provider of behavioral care in the UK and internationally, offering healthcare, education, and care services for over 30,000 people annually

Hospitals and Health Care πŸ‡¬πŸ‡§ 5,504 1980
80
Octopus Energyoctopus.energy

providing affordable, transparent renewable energy solutions with innovative technology and exceptional customer service across multiple countries and sectors

Utilities πŸ‡¬πŸ‡§ London 5,415 n/a
81
Moniepoint Groupmoniepoint.com

A leading fintech company offering digital payment solutions, credit access, and business management tools to help businesses worldwide grow and succeed

Financial Services πŸ‡¬πŸ‡§ London 5,413 2015
82
Oxford University Hospitals NHS Foundation Trustouh.nhs.uk

A world-renowned NHS teaching trust with four hospitals in Oxford, providing clinical services, specialist care, medical education, training, and research

Hospitals and Health Care πŸ‡¬πŸ‡§ Oxford 5,379 n/a
83
O2 (TelefΓ³nica UK)o2.co.uk

Leading UK mobile network operator providing 2G to 5G services, retail stores, WiFi, and partnerships with Tesco Mobile and entertainment venues.

Telecommunications πŸ‡¬πŸ‡§ Reading 5,371 n/a
84
United Utilitiesunitedutilities.com

Provides water and wastewater services to seven million people in the North West of England through treatment, delivery, and environmental protection measures

Utilities πŸ‡¬πŸ‡§ Warrington 5,299 1995
85
ScottishPowerscottishpower.com

Leading renewable energy generation, managing electricity grids, and supporting homes and businesses in transitioning to a low carbon future.

Utilities πŸ‡¬πŸ‡§ Glasgow 5,295 n/a
86
Cambridge University Hospitals NHS Foundation Trustcuh.nhs.uk

A leading healthcare provider delivering general, specialist, women's, and maternity care, known for biomedical research, academic health science, and innovative healthcare solutions

Hospitals and Health Care πŸ‡¬πŸ‡§ Cambridge 5,288 n/a
87
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
88
Monzomonzo.com

A mobile-first bank focused on solving problems, treating customers fairly, and being transparent to make banking better

Financial Services πŸ‡¬πŸ‡§ London 5,267 2015
89
GTRgtrailwaycareers.com

A leading UK train operating company, part of Govia, investing in infrastructure & technology to provide more trains, seats, and services for customers

Rail Transportation πŸ‡¬πŸ‡§ London 5,187 2014
90
Colt Technology Servicescolt.net

Global digital infrastructure provider connecting businesses across 40+ countries with extensive networks, customer-focused innovation, and reliable connectivity solutions.

Telecommunications πŸ‡¬πŸ‡§ London 5,107 1992
91
Utility Warehouseuw.co.uk

A growing business focusing on simplifying utilities and providing personalized service to help people spend more time on important things

Utilities πŸ‡¬πŸ‡§ London 5,083 1997
92
Vivo Energyvivoenergy.com

A leading energy company in Africa, distributing Shell and Engen branded fuels and lubricants to retail and commercial customers with a focus on safety, innovation, and customer satisfaction

Oil and Gas πŸ‡¬πŸ‡§ London 5,081 2011
93
St George's University Hospitals NHS Foundation Truststgeorges.nhs.uk

Large healthcare provider offering acute, specialist, community hospital care, and extensive community services including education and medical research.

Hospitals and Health Care πŸ‡¬πŸ‡§ Tooting 4,910 1733
94
Belfast Health and Social Care Trustbelfasttrust.hscni.net

Delivering integrated health and social care services to 340,000 people in Belfast and throughout Northern Ireland, with a focus on improving health and reducing inequalities

Hospitals and Health Care πŸ‡¬πŸ‡§ Belfast 4,902 2007
95
MAG (Airports Group)magairports.com

Ownership and operation of three major UK airports, digital travel services, extensive route network, economic contribution, and sustainability focus.

Airlines and Aviation πŸ‡¬πŸ‡§ Manchester 4,902 2001
96
Cygnetcygnetgroup.com

Providing health and social care services for individuals with mental health needs, brain injuries, eating disorders, autism, and learning disabilities in the UK.

Hospitals and Health Care πŸ‡¬πŸ‡§ London 4,847 1988
97
HC-Onehc-one.co.uk

Provider of professional residential, nursing, and dementia care for older people across England, Scotland, and Wales, focusing on kindness and making a positive impact in communities

Hospitals and Health Care πŸ‡¬πŸ‡§ County Durham 4,840 2011
98
Hermesevri.com

It is the UK's largest dedicated parcel delivery company, recently rebranded as Evri, reflecting significant growth and transformation efforts.

Truck Transportation πŸ‡¬πŸ‡§ 4,807 1974
99
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
100
Arriva Grouparrivagroup.com

A leading passenger transport operator in Europe, providing a wide range of transportation services across 10 European countries

Ground Passenger Transportation πŸ‡¬πŸ‡§ Sunderland 4,733 1938

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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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