# List of critical infrastructure operators in North America

Tamtam tracks 6,768 critical infrastructure operators headquartered in North America. This list ranks the 100 largest by number of employees on LinkedIn, led by UnitedHealth Group, Bank of America and J.P. Morgan. Their median headcount is 46,913. The most common headquarters are New York (14), Toronto (6) and Dallas (4).

This list comprises large critical infrastructure operators in North America, primarily established financial services and healthcare groups. Companies like UnitedHealth Group, with 380,000 employees, focus on health care and well-being. Bank of America provides global financial services, while AT&T offers telecommunications. FedEx is a leader in shipping and logistics.

A notable pattern is the concentration of financial services companies headquartered in New York, including J.P. Morgan, JPMorganChase, and Citi, indicating a strong hub for banking and asset management in the city.

🌍 North America · 100 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [UnitedHealth Group](https://www.tamtam.ai/c/unitedhealth-group) (unitedhealthgroup.com)<br>Health care and well-being company focused on improving access, affordability, outcomes, and experiences through technology, data, and high-quality health benefits | Hospitals and Health Care | 🇺🇸 Eden Prairie | 380,000 | 1977 |
| 2 | [Bank of America](https://www.tamtam.ai/c/bank-of-america) (bankofamerica.com)<br>Global financial institution providing comprehensive banking, investing, and asset management services to individuals, small businesses, and large corporations through diverse risk management products. | Banking | 🇺🇸 Charlotte | 304,000 |  |
| 3 | [J.P. Morgan](https://www.tamtam.ai/c/j-p-morgan) (jpmorgan.com)<br>Providing comprehensive financial services and wealth management solutions to clients worldwide, prioritizing client interests and long-term relationships. | Financial Services | 🇺🇸 New York | 240,000 |  |
| 4 | [Wells Fargo](https://www.tamtam.ai/c/wells-fargo) (wellsfargo.com)<br>A diversified financial services company offering banking, investment, mortgage products, and more through numerous locations and digital platforms Serving customers globally | Financial Services | 🇺🇸 San Francisco | 234,570 |  |
| 5 | [JPMorganChase](https://www.tamtam.ai/c/jpmorganchase) (jpmorganchase.com)<br>Global financial institution, managing assets and investments, offering business advice, strategies, and innovative banking solutions to diverse clients worldwide. | Financial Services | 🇺🇸 New York | 231,537 |  |
| 6 | [U.S. Department of Veterans Affairs](https://www.tamtam.ai/c/u-s-department-of-veterans-affairs) (va.gov)<br>Recruitment of skilled employees dedicated to providing respectful and appropriate care and support services for United States veterans. | Government Administration | 🇺🇸 Washington | 202,010 | 1930 |
| 7 | [AT&T](https://www.tamtam.ai/c/at-and-t) (att.com)<br>Innovative company connecting people with technology to create a seamless, better life through network, products, services, and passionate employees | Telecommunications | 🇺🇸 Dallas | 193,793 |  |
| 8 | [FedEx](https://www.tamtam.ai/c/fedex) (fedex.com)<br>A global leader in shipping, transportation, e-commerce, and business services, known for exceptional customer service and a focus on safety and ethics | Freight and Package Transportation | 🇺🇸 Memphis | 193,709 | 1973 |
| 9 | [Comcast](https://www.tamtam.ai/c/comcast) (comcast.com)<br>Delivering broadband, mobile, and video products, along with entertainment, sports, news, and theme park experiences; driven by passionate creators and innovators | Telecommunications | 🇺🇸 Philadelphia | 189,000 | 1963 |
| 10 | [Citi](https://www.tamtam.ai/c/citi) (citi.com)<br>A global financial institution with 200 years of experience providing services like asset safeguarding, lending, payments, and capital market access | Financial Services | 🇺🇸 New York | 188,351 | 1812 |
| 11 | [UPS](https://www.tamtam.ai/c/ups) (ups.com)<br>A global transportation and logistics company with a strong social impact, offering innovative solutions and opportunities for job seekers worldwide | Truck Transportation | 🇺🇸 Atlanta | 168,435 | 1907 |
| 12 | [United States Postal Service](https://www.tamtam.ai/c/united-states-postal-service) (usps.com)<br>Delivers mail and packages to over 157 million addresses nationwide, connecting every American, every door, every business, everywhere, funded by sales, not tax dollars. | Government Administration | 🇺🇸 Washington | 159,003 |  |
| 13 | [University of California](https://www.tamtam.ai/c/university-of-california) (jobs.universityofcalifornia.edu)<br>Educating top minds, advancing research, engaging communities, supporting economy, improving health, protecting environment, and driving innovation across California. | Higher Education | 🇺🇸 Oakland | 152,503 |  |
| 14 | [HCA Healthcare](https://www.tamtam.ai/c/hca-healthcare) (dpxmedcity.net)<br>A healthcare organization with 186 hospitals and 2,300 sites, focused on providing quality care, advancing science, and impacting communities positively | Hospitals and Health Care | 🇺🇸 Nashville | 150,409 |  |
| 15 | [Walgreens Boots Alliance](https://www.tamtam.ai/c/walgreens-boots-alliance) (walgreens.com)<br>Integrated healthcare and retail company operating thousands of pharmacy locations, providing medicines, health services, beauty products, and digital convenience globally. | Retail Pharmacies | 🇺🇸 Deerfield | 141,576 | 2014 |
| 16 | [CVS Health](https://www.tamtam.ai/c/cvs-health) (cvshealth.com)<br>Providing accessible health care services, managing chronic diseases, supporting medication compliance, and improving community health through local and digital channels. | Hospitals and Health Care | 🇺🇸 Woonsocket | 139,212 | 1963 |
| 17 | [Kaiser Permanente](https://www.tamtam.ai/c/kaiser-permanente) (healthy.kaiserpermanente.org)<br>Leading not-for-profit health plan with a unique business model driving industry improvements, serving millions of members across multiple states and impacting communities positively | Hospitals and Health Care | 🇺🇸 Oakland | 137,397 | 1945 |
| 18 | [Verizon](https://www.tamtam.ai/c/verizon) (verizon.com)<br>A global human network that values creativity, connection, and flexibility, dedicated to making an impact and moving the world forward | IT Services and IT Consulting | 🇺🇸 Basking Ridge | 137,000 |  |
| 19 | [Optum](https://www.tamtam.ai/c/optum) (optum.com)<br>A leading health services and innovation company revolutionizing health care delivery, operations, and analytics to improve quality and efficiency globally | Hospitals and Health Care | 🇺🇸 Eden Prairie | 113,067 |  |
| 20 | [State Farm](https://www.tamtam.ai/c/state-farm) (statefarm.com)<br>Providing insurance and financial solutions to help people manage risks, recover from unexpected events, and achieve their dreams. | Insurance | 🇺🇸 Bloomington | 112,234 | 1922 |
| 21 | [TD](https://www.tamtam.ai/c/td-toronto) (careers.td.com)<br>A leading North American bank with a global presence, serving 22 million customers with a team of over 85,000 employees Providing legendary customer experiences | Banking | 🇨🇦 Toronto | 105,476 |  |
| 22 | [Morgan Stanley](https://www.tamtam.ai/c/morgan-stanley) (morganstanley.com)<br>Global financial services firm providing investment banking, securities, wealth and investment management services to corporations, governments, institutions, and individuals through strategic capital allocation. | Financial Services | 🇺🇸 New York | 103,041 |  |
| 23 | [RBC](https://www.tamtam.ai/c/rbc) (rbc.com)<br>Global financial institution focused on delivering leading performance through innovative solutions, exceptional client experiences, and community support initiatives in various countries | Banking | 🇨🇦 Toronto | 99,801 |  |
| 24 | [Spectrum](https://www.tamtam.ai/c/spectrum-stamford) (spectrum.net)<br>A leading broadband connectivity company offering internet, TV, mobile, voice, and tailored advertising services to residential, business, and government customers | Telecommunications | 🇺🇸 Stamford | 97,651 | 1993 |
| 25 | [T-Mobile](https://www.tamtam.ai/c/t-mobile) (careers.t-mobile.com)<br>Leading US wireless provider delivering advanced 4G LTE and nationwide 5G networks, prioritizing customer value, service excellence, and innovation in Bellevue, Washington | Telecommunications | 🇺🇸 Bellevue | 96,232 |  |
| 26 | [Humana](https://www.tamtam.ai/c/humana) (humana.com)<br>This company focuses on delivering personalized healthcare experiences, creating innovative solutions, and prioritizing the well-being of individuals and communities | Insurance | 🇺🇸 Louisville | 96,000 |  |
| 27 | [American Express](https://www.tamtam.ai/c/american-express) (americanexpress.com)<br>A globally integrated payments company supporting customers' financial confidence, promoting commerce, and providing experiences that enrich lives and drive business success | Financial Services | 🇺🇸 New York | 94,909 |  |
| 28 | [U.S. Bank](https://www.tamtam.ai/c/u-s-bank) (usbank.com)<br>A leading commercial bank offering a blend of personal service and digital tools to serve millions of clients worldwide | Banking | 🇺🇸 Minneapolis | 87,474 |  |
| 29 | [Scotiabank](https://www.tamtam.ai/c/scotiabank) (scotiabank.com)<br>A global financial institution serving customers, families, and communities by providing advice, products, and services to help them achieve success | Banking | 🇨🇦 Toronto | 87,065 |  |
| 30 | [Capital One](https://www.tamtam.ai/c/capital-one) (capitalone.com)<br>Innovative bank focused on financial inclusion, creating tools to improve customers' lives, and encouraging a work-life balance for employees | Financial Services | 🇺🇸 McLean | 82,863 |  |
| 31 | [Goldman Sachs](https://www.tamtam.ai/c/goldman-sachs) (goldmansachs.com)<br>Global financial institution providing expert capital markets services, investment banking, and asset management for clients through partnership, integrity, and world-class operational excellence. | Financial Services | 🇺🇸 New York | 76,000 |  |
| 32 | [Delta Air Lines](https://www.tamtam.ai/c/delta-air-lines) (delta.com)<br>Leading global airline focused on safety, innovation, operational excellence, and award-winning customer service connecting people and cultures worldwide. | Airlines and Aviation | 🇺🇸 Atlanta | 75,854 | 1925 |
| 33 | [United Airlines](https://www.tamtam.ai/c/united-airlines) (united.com)<br>Leading airline with over 90,000 employees focused on customer service, sustainability, and teamwork, currently hiring 15,000 new team members in 2023 | Airlines and Aviation | 🇺🇸 Chicago | 75,520 | 1926 |
| 34 | [Ascension](https://www.tamtam.ai/c/ascension) (healthcare.ascension.org)<br>A faith-based healthcare organization focused on providing compassionate care to those in need across the US through various services and programs | Hospitals and Health Care | 🇺🇸 St. Louis | 66,381 | 1999 |
| 35 | [Verizon Wireless](https://www.tamtam.ai/c/verizon-wireless) (verizonwireless.com)<br>This company powers fast and reliable network, offers cloud and security solutions, and leads in IoT and video entertainment | Telecommunications | 🇺🇸 Basking Ridge | 65,405 |  |
| 36 | [PNC](https://www.tamtam.ai/c/pnc) (pnc.com)<br>Provides financial services focused on managing money effectively to simplify clients' financial lives and support their life goals. | Financial Services | 🇺🇸 Pittsburgh | 64,159 |  |
| 37 | [BMO](https://www.tamtam.ai/c/bmo) (bmo.com)<br>Financial institution offering banking services, career growth opportunities, learning programs, and a supportive culture for personal and professional success. | Financial Services | 🇨🇦 Toronto | 60,290 |  |
| 38 | [American Airlines](https://www.tamtam.ai/c/american-airlines) (aa.com)<br>Operate a global airline with over 1,300 aircraft, connecting customers worldwide while providing career growth and leadership opportunities. | Airlines and Aviation | 🇺🇸 Dallas-Fort Worth | 60,018 |  |
| 39 | [MetLife](https://www.tamtam.ai/c/metlife-new-york) (metlife.com)<br>A leading financial services company offering insurance, annuities, employee benefits, and asset management globally, focused on simplifying and meeting customers' evolving needs | Insurance | 🇺🇸 New York | 58,000 |  |
| 40 | [Northwell Health](https://www.tamtam.ai/c/northwell-health) (northwell.edu)<br>Largest New York healthcare system with hospitals, outpatient facilities, research institutes, medical education, and extensive patient care services. | Hospitals and Health Care | 🇺🇸 Lake Success | 56,405 | 1997 |
| 41 | [BNY](https://www.tamtam.ai/c/bny) (bny.com)<br>Global financial platforms provider managing investment assets and custody services for top banks, governments, pension plans, and major corporations to accelerate growth. | Financial Services | 🇺🇸 New York | 55,654 | 1784 |
| 42 | [Chevron](https://www.tamtam.ai/c/chevron) (chevron.com)<br>The company values its people and their innovation in tackling energy challenges, fostering open and respectful communication on LinkedIn | Oil and Gas | 🇺🇸 Houston | 55,495 |  |
| 43 | [Allstate](https://www.tamtam.ai/c/allstate) (allstate.com)<br>This company advocates for peace of mind, builds diverse teams, develops careers, and empowers people and communities through innovation and advocacy | Insurance | 🇺🇸 Northbrook | 55,012 | 1931 |
| 44 | [Mastercard](https://www.tamtam.ai/c/mastercard) (mastercard.com)<br>Global technology company in payments industry connecting and powering inclusive digital economy through safe, simple, smart transactions benefiting individuals, institutions, and businesses worldwide | IT Services and IT Consulting | 🇺🇸 Purchase | 49,687 |  |
| 45 | [Cleveland Clinic](https://www.tamtam.ai/c/cleveland-clinic) (my.clevelandclinic.org)<br>A not-for-profit academic medical center in Ohio, offering clinical care, research, and education with multiple facilities worldwide | Hospitals and Health Care | 🇺🇸 Cleveland | 49,624 |  |
| 46 | [Lumen Technologies](https://www.tamtam.ai/c/lumen-technologies) (lumen.com)<br>The company provides digital connectivity solutions, utilizing their network strength to connect people, data, and applications quickly, securely, and effortlessly | Technology, Information and Internet | 🇺🇸 Monroe | 49,357 |  |
| 47 | [Mayo Clinic](https://www.tamtam.ai/c/mayo-clinic) (mayoclinic.org)<br>A leading not-for-profit medical practice founded on values of patient-centered care, teamwork, professionalism, and excellence in healthcare services | Hospitals and Health Care | 🇺🇸 Rochester | 48,774 |  |
| 48 | [CommonSpirit Health](https://www.tamtam.ai/c/commonspirit-health) (commonspirit.careers)<br>Building a healthier future for all through integrated health services, delivering patient encounters via clinics, care sites, hospitals, home-based services, and virtual care. | Hospitals and Health Care | 🇺🇸 Chicago | 48,074 |  |
| 49 | [CIBC](https://www.tamtam.ai/c/cibc) (cibc.com)<br>Providing reliable financial products/services with innovative tools, dedicated to helping clients achieve their goals Cultivating a culture of trust, teamwork, and accountability | Banking | 🇨🇦 Toronto | 47,865 |  |
| 50 | [State Street](https://www.tamtam.ai/c/state-street) (statestreet.com)<br>Global financial leader providing comprehensive investment services, institutional asset management, multi-asset trading, and digital solutions to enhance portfolio performance and decision making. | Financial Services | 🇺🇸 Boston | 46,913 | 1792 |
| 51 | [Alberta Health Services](https://www.tamtam.ai/c/alberta-health-services) (albertahealthservices.ca)<br>providing accessible, sustainable, patient-focused health services to over 4.5 million people across Alberta with dedicated professionals | Hospitals and Health Care | 🇨🇦 Edmonton | 46,248 | 2008 |
| 52 | [Edward Jones](https://www.tamtam.ai/c/edward-jones-st-louis) (edwardjones.com)<br>Provides personalized financial advisory and investment services through a large network of advisors to help clients achieve financial goals. | Financial Services | 🇺🇸 St. Louis | 45,845 | 1922 |
| 53 | [PEMEX](https://www.tamtam.ai/c/pemex) (pemex.com)<br>A leading Mexican company in the oil industry, involved in exploration, production, distribution, and petrochemicals Major contributor to the country's economy and social development | Oil and Gas | 🇲🇽 Mexico City | 45,692 | 1938 |
| 54 | [Desjardins](https://www.tamtam.ai/c/desjardins) (desjardins.com)<br>A leading cooperative financial group in Canada, offering a wide range of products and services through online platforms and subsidiaries | Banking | 🇨🇦 Lévis | 44,145 |  |
| 55 | [Tenet Healthcare](https://www.tamtam.ai/c/tenet-healthcare) (tenethealth.com)<br>Operates ambulatory surgery centers, acute and specialty hospitals, physician networks, and provides revenue cycle management and value-based care services. | Hospitals and Health Care | 🇺🇸 Dallas | 44,016 |  |
| 56 | [Elevance Health](https://www.tamtam.ai/c/elevance-health) (elevancehealth.com)<br>Serving over 118 million people with a digital platform and integrated health services, focusing on improving health at every stage. | Hospitals and Health Care | 🇺🇸 Indianapolis | 43,568 |  |
| 57 | [Labcorp](https://www.tamtam.ai/c/labcorp) (labcorp.com)<br>Provides innovative, comprehensive laboratory services, insights, and advanced science to improve health outcomes and develop new drugs for global clients and patients. | Hospitals and Health Care | 🇺🇸 Burlington | 42,780 | 1905 |
| 58 | [UPMC](https://www.tamtam.ai/c/upmc) (upmc.com)<br>A leading health care provider and insurer in Pittsburgh, offering patient-centered care, innovative models, and community benefits through hospitals and insurance services | Hospitals and Health Care | 🇺🇸 Pittsburgh | 41,860 |  |
| 59 | [AdventHealth](https://www.tamtam.ai/c/adventhealth) (jobs.adventhealth.com)<br>A healthcare organization with a Christian mission to provide holistic care through skilled caregivers across 9 states in various settings | Hospitals and Health Care | 🇺🇸 Altamonte Springs | 41,645 | 1973 |
| 60 | [Aetna, a CVS Health Company](https://www.tamtam.ai/c/aetna-a-cvs-health-company) (aetna.com)<br>A leading health care benefits company focused on making health care easy, affordable, and personalized Promoting diversity, inclusion, and community well-being | Wellness and Fitness Services | 🇺🇸 Hartford | 40,685 |  |
| 61 | [USAA](https://www.tamtam.ai/c/usaa) (usaa.com)<br>This company provides financial services to the military community, offering competitive products, exceptional service, and trusted advice with integrity and loyalty | Financial Services | 🇺🇸 San Antonio | 40,406 | 1922 |
| 62 | [Southwest Airlines](https://www.tamtam.ai/c/southwest-airlines) (southwest.com)<br>This company provides a friendly, customer-centered airline experience, prioritizing customer service and compassion in all their interactions | Airlines and Aviation | 🇺🇸 Dallas | 40,329 | 1971 |
| 63 | [DaVita Kidney Care](https://www.tamtam.ai/c/davita-kidney-care) (davita.com)<br>Leaders in dialysis, providing essential life-sustaining treatment for end-stage kidney disease. Minimizing impacts of kidney disease across full spectrum of kidney health care. | Hospitals and Health Care | 🇺🇸 Denver | 39,850 |  |
| 64 | [Johns Hopkins Medicine](https://www.tamtam.ai/c/johns-hopkins-medicine) (hopkinsmedicine.org)<br>Coordinates research, teaching, patient care, and related enterprises for the university's School of Medicine and health system, including hospitals and healthcare practices. | Hospitals and Health Care | 🇺🇸 Baltimore | 39,325 |  |
| 65 | [XPO](https://www.tamtam.ai/c/xpo-greenwich) (xpo.com)<br>A global transportation company offering top-tier solutions to leading companies, with diverse opportunities for career growth and impactful work | Truck Transportation | 🇺🇸 Greenwich | 38,917 |  |
| 66 | [PayPal](https://www.tamtam.ai/c/paypal) (paypal.com)<br>Enables fast, easy, enjoyable money movement for individuals and businesses globally, unlocking opportunities and empowering everyday financial interactions for millions. | Software Development | 🇺🇸 San Jose | 38,343 | 1998 |
| 67 | [TELUS](https://www.tamtam.ai/c/telus) (telus.com)<br>A purpose-driven team innovating technology solutions to empower customers, communities, and each other to thrive in a digital world | Telecommunications | 🇨🇦 Vancouver | 38,236 |  |
| 68 | [Liberty Mutual Insurance](https://www.tamtam.ai/c/liberty-mutual-insurance) (libertymutualgroup.com)<br>Global leader in property and casualty insurance dedicated to fostering career growth, social responsibility, sustainability, diversity, and innovative solutions for customers worldwide | Insurance | 🇺🇸 Boston | 37,734 | 1912 |
| 69 | [Northwestern Mutual](https://www.tamtam.ai/c/northwestern-mutual) (northwesternmutual.com)<br>Financial planning and wealth management through life insurance, disability income, annuities, brokerage services, and discretionary portfolio management for over four million clients worldwide. | Financial Services | 🇺🇸 Milwaukee | 37,457 | 1857 |
| 70 | [Prudential plc](https://www.tamtam.ai/c/prudential-plc) (prudentialplc.com)<br>Trusted financial services | Financial Services | 🇺🇸 Central | 37,372 |  |
| 71 | [New York Life](https://www.tamtam.ai/c/new-york-life) (newyorklife.com)<br>A company committed to putting love into action, supporting local communities through volunteering and giving, while prioritizing development, diversity, and integrity | Financial Services | 🇺🇸 New York | 37,288 | 1845 |
| 72 | [New York Life](https://www.tamtam.ai/c/new-york-life-92634034) (newyorklife.com)<br>Provides life insurance, investment products, retirement planning, and advisory services to protect families and grow financial security over time. | Financial Services | 🇺🇸 | 37,000 | 1845 |
| 73 | [Sprint](https://www.tamtam.ai/c/sprint) (t-mobile.com)<br>The company offers T-Mobile® Business Advantage services Connect with T-Mobile For Business to learn more about their offerings | Telecommunications | 🇺🇸 Overland Park | 36,990 | 1899 |
| 74 | [Centene Corporation](https://www.tamtam.ai/c/centene-corporation) (centene.com)<br>Providing affordable, high-quality healthcare plans for Medicaid, Medicare, and marketplace members, focusing on under-insured and uninsured individuals nationwide. | Hospitals and Health Care | 🇺🇸 St. Louis | 36,022 | 1984 |
| 75 | [Intermountain Health](https://www.tamtam.ai/c/intermountain-health) (intermountainhealthcare.org)<br>The largest nonprofit health system in the Mountain West region providing expert care, personalized research, and affordable healthcare services in various states | Hospitals and Health Care | 🇺🇸 Murray | 35,965 |  |
| 76 | [Travelers](https://www.tamtam.ai/c/travelers) (travelers.com)<br>A leading insurance company offering coverage for homes, cars, valuables, and businesses with a focus on customer care, innovation, and risk management | Insurance | 🇺🇸 New York | 35,633 | 1853 |
| 77 | [Banner Health](https://www.tamtam.ai/c/banner-health) (bannerhealth.com)<br>Nonprofit healthcare system operating hospitals, urgent care, clinics, home care, hospice, pharmacies, and physician groups across six states. | Hospitals and Health Care | 🇺🇸 Phoenix | 35,542 | 1999 |
| 78 | [Cox Enterprises](https://www.tamtam.ai/c/cox-enterprises) (coxenterprises.com)<br>Global family-owned company focusing on broadband communications, automotive solutions, and sustainable technologies to improve communities and future mobility. | Technology, Information and Media | 🇺🇸 Atlanta | 35,357 | 1898 |
| 79 | [Health Service Executive](https://www.tamtam.ai/c/health-service-executive) (hse.ie)<br>Provides safe, high quality health and personal social services to the population of Ireland, aiming for a healthier nation with valued healthcare. | Hospitals and Health Care | 🇲🇽 Dublin | 34,791 | 2005 |
| 80 | [Chase](https://www.tamtam.ai/c/chase) (chase.com)<br>Providing a wide range of financial services to nearly half of American households, including personal banking, credit cards, mortgages, and small business loans | Financial Services | 🇺🇸 New York | 34,783 |  |
| 81 | [Merrill Lynch](https://www.tamtam.ai/c/merrill-lynch) (ml.com)<br>Global wealth management firm providing financial advice and solutions tailored to clients' needs including investment management, retirement planning, estate planning, and banking services | Financial Services | 🇺🇸 New York | 34,594 |  |
| 82 | [Manulife](https://www.tamtam.ai/c/manulife) (manulife.com)<br>Global financial services group providing insurance, wealth management, and asset management solutions to millions of customers worldwide. | Insurance | 🇨🇦 Toronto | 34,375 |  |
| 83 | [Bell](https://www.tamtam.ai/c/bell-montreal) (letstalk.bell.ca)<br>A leading Canadian communications company offering advanced wireless, internet, TV, media, and business services, as well as supporting social and economic prosperity | Telecommunications | 🇨🇦 Montreal | 34,053 | 1880 |
| 84 | [Advocate Health](https://www.tamtam.ai/c/advocate-health) (advocatehealth.org)<br>Advocate Health redefines care delivery to help people live well by providing equitable services across six states for better outcomes at lower costs | Hospitals and Health Care | 🇺🇸 Charlotte | 34,037 |  |
| 85 | [Charter Communications](https://www.tamtam.ai/c/charter-communications) (charter.com)<br>Provider of internet, television, and phone services, delivering innovative telecommunications solutions to residential and business customers nationwide. | Telecommunications | 🇺🇸 Stamford | 33,550 |  |
| 86 | [British Airways](https://www.tamtam.ai/c/british-airways) (ba.com)<br>Operating extensive international flight routes connecting Britain with over 200 destinations across six continents, focusing on sustainable aviation practices. | Airlines and Aviation | 🇺🇸 Middlesex | 32,662 | 1919 |
| 87 | [Charles Schwab](https://www.tamtam.ai/c/charles-schwab) (aboutschwab.com)<br>An investment services firm disrupting traditional Wall Street, offering brokerage, banking, and financial advisory services to improve the investing experience for clients | Financial Services | 🇺🇸 Westlake | 32,647 |  |
| 88 | [Bon Secours Mercy Health](https://www.tamtam.ai/c/bon-secours-mercy-health) (bsmhealth.org)<br>Operates 48 hospitals and thousands of providers across seven states and Ireland, focusing on quality, safety, and cost-effective healthcare delivery. | Hospitals and Health Care | 🇺🇸 Cincinnati | 32,495 |  |
| 89 | [Quest Diagnostics](https://www.tamtam.ai/c/quest-diagnostics) (questdiagnostics.com)<br>Provides extensive clinical laboratory testing services, innovative diagnostics, pathology, and consultation to improve health outcomes and support healthcare providers. | Medical and Diagnostic Laboratories | 🇺🇸 Secaucus | 32,423 | 1967 |
| 90 | [Dignity Health](https://www.tamtam.ai/c/dignity-health) (commonspirit.careers)<br>Providing accessible, compassionate healthcare through numerous hospitals and care centers across California, Arizona, and Nevada, offering a range of medical services and specialties | Hospitals and Health Care | 🇺🇸 San Francisco | 32,260 |  |
| 91 | [Baylor Scott & White Health](https://www.tamtam.ai/c/baylor-scott-and-white-health) (bswhealth.com)<br>A Texas-based not-for-profit health system dedicated to providing accessible, integrated, and affordable healthcare through a wide network of facilities and services | Hospitals and Health Care | 🇺🇸 Dallas | 31,869 | 1903 |
| 92 | [Nationwide](https://www.tamtam.ai/c/nationwide) (nationwide.com)<br>A top-rated insurance and financial services organization offering a wide range of products including auto, home, life insurance, retirement plans, and more | Insurance | 🇺🇸 | 31,376 |  |
| 93 | [Northern Trust](https://www.tamtam.ai/c/northern-trust) (northerntrust.com)<br>Global provider of innovative wealth management, asset servicing, and investment solutions for institutions, families, and individuals through diverse technology and financial expertise. | Financial Services | 🇺🇸 Chicago | 30,965 | 1889 |
| 94 | [Visa](https://www.tamtam.ai/c/visa) (visa.com)<br>A global leader in digital payments, connecting consumers, merchants, and financial institutions across 200+ countries with secure transaction solutions | IT Services and IT Consulting | 🇺🇸 Foster City | 30,900 |  |
| 95 | [Atrium Health](https://www.tamtam.ai/c/atrium-health) (atriumhealth.org)<br>Nationally recognized health leader providing innovative research, education, and compassionate patient care through top-ranked specialties, medical education, and community benefits | Hospitals and Health Care | 🇺🇸 Charlotte | 30,465 | 1940 |
| 96 | [M&T Bank](https://www.tamtam.ai/c/m-and-t-bank) (mtb.com)<br>Full-service commercial bank offering retail banking, wealth management, and institutional services with a strong community focus and employee development. | Financial Services | 🇺🇸 Buffalo | 30,335 |  |
| 97 | [Mercy](https://www.tamtam.ai/c/mercy) (mercy.net)<br>A nationally recognized health system providing excellent patient care, with over 50 hospitals, 900+ physician locations, and outreach ministries across multiple states | Hospitals and Health Care | 🇺🇸 Chesterfield | 30,240 | 1886 |
| 98 | [Mount Sinai Health System](https://www.tamtam.ai/c/mount-sinai-health-system) (mountsinai.org)<br>Provides distinguished care, conducts transformative research, and advances biomedical education through hospitals, a medical school, and extensive ambulatory network. | Hospitals and Health Care | 🇺🇸 New York | 30,202 | 2013 |
| 99 | [HonorHealth](https://www.tamtam.ai/c/honorhealth) (honorhealth.com)<br>Provides comprehensive healthcare services including acute-care hospitals, medical group, cancer care, surgery centers, research, education, and community services across Arizona. | Hospitals and Health Care | 🇺🇸 Scottsdale | 30,000 | 2013 |
| 100 | [NYU Langone Health](https://www.tamtam.ai/c/nyu-langone-health) (jobs.nyulangone.org)<br>World-class academic medical center with top-ranked patient care, education, and research programs, serving diverse communities with excellence and inclusive values | Hospitals and Health Care | 🇺🇸 New York | 29,840 |  |

## 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 North America

- [The largest companies in North America](https://www.tamtam.ai/l/largest-companies-in-north-america) (119,523)
- [Multinational companies in North America](https://www.tamtam.ai/l/multinational-companies-in-north-america) (18,660)
- [Manufacturers in North America](https://www.tamtam.ai/l/manufacturers-in-north-america) (10,136)
- [Education providers in North America](https://www.tamtam.ai/l/education-companies-in-north-america) (8,464)
- [Retail chains in North America](https://www.tamtam.ai/l/retail-chains-in-north-america) (8,234)
- [Financial services firms in North America](https://www.tamtam.ai/l/financial-services-firms-in-north-america) (7,764)
- [Companies with in-house R&D in North America](https://www.tamtam.ai/l/r-and-d-companies-in-north-america) (7,619)
- [Hardware manufacturers in North America](https://www.tamtam.ai/l/hardware-companies-in-north-america) (5,985)
- [Financial Services companies in North America](https://www.tamtam.ai/l/financial-services-companies-in-north-america) (5,616)
- [Public sector organisations in North America](https://www.tamtam.ai/l/public-sector-organisations-in-north-america) (5,041)
- [Higher Education companies in North America](https://www.tamtam.ai/l/higher-education-companies-in-north-america) (3,953)
- [Construction companies in North America](https://www.tamtam.ai/l/construction-companies-in-north-america) (3,792)
- [Energy companies in North America](https://www.tamtam.ai/l/energy-companies-in-north-america) (3,543)
- [Publicly traded companies in North America](https://www.tamtam.ai/l/publicly-traded-companies-in-north-america) (3,538)
- [Family-owned companies in North America](https://www.tamtam.ai/l/family-owned-companies-in-north-america) (3,387)
- [Corporate groups and holding companies in North America](https://www.tamtam.ai/l/holding-companies-in-north-america) (3,311)
- [Distributors and wholesalers in North America](https://www.tamtam.ai/l/distributors-and-wholesalers-in-north-america) (3,208)
- [Hotel and hospitality groups in North America](https://www.tamtam.ai/l/hospitality-groups-in-north-america) (3,148)
- [E-commerce companies in North America](https://www.tamtam.ai/l/ecommerce-companies-in-north-america) (2,944)
- [Logistics companies in North America](https://www.tamtam.ai/l/logistics-companies-in-north-america) (2,701)
- [Insurance companies in North America](https://www.tamtam.ai/l/insurance-companies-in-north-america) (2,622)
- [Government Administration companies in North America](https://www.tamtam.ai/l/government-administration-companies-in-north-america) (2,495)
- [Retail companies in North America](https://www.tamtam.ai/l/retail-companies-in-north-america) (2,407)
- [Contract manufacturers in North America](https://www.tamtam.ai/l/contract-manufacturers-in-north-america) (2,377)

## The same list elsewhere

- [Critical infrastructure operators in the world](https://www.tamtam.ai/l/critical-infrastructure-operators-in-the-world) (23,312)
- [Critical infrastructure operators in the United States](https://www.tamtam.ai/l/critical-infrastructure-operators-united-states) (5,801)
- [Critical infrastructure operators in Canada](https://www.tamtam.ai/l/critical-infrastructure-operators-canada) (767)
- [Critical infrastructure operators in Mexico](https://www.tamtam.ai/l/critical-infrastructure-operators-mexico) (200)

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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-in-north-america