# Critical infrastructure operators headquartered in Phoenix
Tamtam tracks 38 critical infrastructure operators headquartered in Phoenix. This list ranks the 30 largest by number of employees on LinkedIn, led by Banner Health, Swift Transportation and Cable One/Sparklight Careers. Their median headcount is 1,482. Half of them were founded in 1977 or later.
This selection of companies in Phoenix primarily comprises large firms, many of which are well-established. The dominant industries are healthcare and transportation. For example, Banner Health is a nonprofit healthcare system operating hospitals and clinics across six states, while Swift Transportation is a large full-truckload motor carrier. Other notable companies include Cable One/Sparklight Careers, providing telecommunications solutions, and Western Alliance Bank, which offers commercial banking and consumer financial products.
A clear pattern is the strong presence of healthcare providers, with several large hospitals and health systems like Phoenix Children's, St. Joseph's Hospital and Medical Center, and Abrazo Health, all based in Phoenix. This indicates a significant concentration of critical healthcare infrastructure in the city.
๐บ๐ธ Phoenix ยท 30 companies ยท Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Banner Health](https://www.tamtam.ai/c/banner-health) (bannerhealth.com)
Nonprofit healthcare system operating hospitals, urgent care, clinics, home care, hospice, pharmacies, and physician groups across six states. | Hospitals and Health Care | ๐บ๐ธ Phoenix | 35,542 | 1999 |
| 2 | [Swift Transportation](https://www.tamtam.ai/c/swift-transportation) (swifttrans.com)
Largest full-truckload motor carrier in North America with extensive terminal network offering diverse freight and logistics services. | Truck Transportation | ๐บ๐ธ Phoenix | 10,957 | 1966 |
| 3 | [Cable One/Sparklight Careers](https://www.tamtam.ai/c/cable-one-sparklight-careers) (sparklight.com)
This company provides scalable, reliable business solutions including high-speed internet, phone service, cable TV, and fiber-optic options for success | Telecommunications | ๐บ๐ธ Phoenix | 7,156 | 1983 |
| 4 | [Phoenix Children's](https://www.tamtam.ai/c/phoenix-children-s) (linktr.ee)
An extensive pediatric health system in Arizona providing world-class inpatient, outpatient, trauma, emergency, and urgent care across 75 specialties | Hospitals and Health Care | ๐บ๐ธ Phoenix | 5,495 | 1983 |
| 5 | [Western Alliance Bank](https://www.tamtam.ai/c/western-alliance-bank) (westernalliancebancorporation.com)
Provides tailored commercial banking and consumer financial products with expert service, operating nationwide through multiple full-service banking brands. | Banking | ๐บ๐ธ Phoenix | 4,327 | |
| 6 | [St. Joseph's Hospital and Medical Center](https://www.tamtam.ai/c/st-joseph-s-hospital-and-medical-center) (stjosephs-phx.org)
A not-for-profit hospital in Phoenix offering quality medical care, research, education, and specialized services in neurology, cardiology, trauma, and more | Hospitals and Health Care | ๐บ๐ธ Phoenix | 3,297 | 1895 |
| 7 | [Arizona Public Service - APS](https://www.tamtam.ai/c/arizona-public-service-aps) (aps.com)
Arizona's largest and longest serving electric utility, providing power to nearly 12 million customers in 11 counties with a focus on sustainability and customer satisfaction | Utilities | ๐บ๐ธ Phoenix | 3,112 | 1886 |
| 8 | [Knight Transportation](https://www.tamtam.ai/c/knight-transportation) (linktr.ee)
A truckload carrier providing dry van, refrigerated, intermodal, and brokerage services nationwide, offering personalized attention and integrated freight transportation for various industries | Truck Transportation | ๐บ๐ธ Phoenix | 2,775 | 1990 |
| 9 | [Arizona Department of Transportation](https://www.tamtam.ai/c/arizona-department-of-transportation) (azdot.gov)
The company provides highway infrastructure and transportation services, aiming to connect people safely and empower the economy with collaborative and results-focused values | Government Administration | ๐บ๐ธ Phoenix | 2,160 | 1912 |
| 10 | [Mesa Airlines, Inc.](https://www.tamtam.ai/c/mesa-airlines-inc) (mesa-air.com)
A regional airline operating for over 35 years, partnering with United Airlines as United Express carrier with hubs across the United States, Canada, and Mexico | Airlines and Aviation | ๐บ๐ธ Phoenix | 2,148 | 1982 |
| 11 | [Abrazo Health](https://www.tamtam.ai/c/abrazo-health) (abrazohealth.com)
An Arizona healthcare system with hospitals, specialty institutes, medical groups, and health plans focusing on employee wellness and personalized healthcare | Hospitals and Health Care | ๐บ๐ธ Phoenix | 1,938 | 2003 |
| 12 | [Centuri Group, Inc.](https://www.tamtam.ai/c/centuri-group-inc) (centuri.com)
Strategic infrastructure services company partnering with utilities to build, maintain energy networks delivering electricity and natural gas safely and sustainably. | Construction | ๐บ๐ธ Phoenix | 1,912 | |
| 13 | [Valleywise Health](https://www.tamtam.ai/c/valleywise-health) (valleywisehealth.org)
Provider of quality healthcare services in Maricopa County for over 140 years, now operating under the name Valleywise Health Promoting healthier communities through accessible care | Hospitals and Health Care | ๐บ๐ธ Phoenix | 1,728 | 1877 |
| 14 | [Western Alliance Bancorporation](https://www.tamtam.ai/c/western-alliance-bancorporation) (westernalliancebancorporation.com)
A top-performing banking company with $30 billion in assets, offering customized financial services through experienced bankers for businesses nationwide | Banking | ๐บ๐ธ Phoenix | 1,525 | |
| 15 | [Sonora Quest Laboratories/ Laboratory Sciences of Arizona](https://www.tamtam.ai/c/sonora-quest-laboratories-laboratory-sciences-of-arizona) (sonoraquest.com)
Performs over 97 million diagnostic tests annually including routine, molecular, genetic, and pathology testing, with 70+ patient service centers across Arizona. | Hospitals and Health Care | ๐บ๐ธ Phoenix | 1,482 | 1997 |
| 16 | [Arizona Health Care Cost Containment System (AHCCCS)](https://www.tamtam.ai/c/arizona-health-care-cost-containment-system-ahcccs) (azahcccs.gov)
Providing comprehensive Medicaid coverage to over 19 million Arizonans through a managed care system focusing on quality health care and cost reduction | Hospitals and Health Care | ๐บ๐ธ Phoenix | 1,244 | 1982 |
| 17 | [Sparklight](https://www.tamtam.ai/c/sparklight) (sparklight.com)
A leading broadband communications provider offering high-speed internet, cable television, phone service, and digital marketing solutions to residential and business customers nationwide | Telecommunications | ๐บ๐ธ Phoenix | 1,158 | 1986 |
| 18 | [Hospice of the Valley](https://www.tamtam.ai/c/hospice-of-the-valley) (hov.org)
Leader in hospice care providing excellence in end-of-life services in central Arizona Innovative programs, quality staff, and inclusive support for patients and families | Hospitals and Health Care | ๐บ๐ธ Phoenix | 1,125 | 1977 |
| 19 | [Desert Financial Credit Union](https://www.tamtam.ai/c/desert-financial-credit-union) (desertfinancial.com)
This company is a locally-based credit union in Arizona, focused on providing financial solutions to over 350,000 members and strengthening the local economy | Financial Services | ๐บ๐ธ Phoenix | 1,069 | 1939 |
| 20 | [Maricopa Integrated Health System](https://www.tamtam.ai/c/maricopa-integrated-health-system) (valleywisehealth.org)
A healthcare system in Phoenix, Arizona, dedicated to serving the underserved with Level I Trauma Center, Burn Center, HIV primary care, and family health centers | Hospitals and Health Care | ๐บ๐ธ Phoenix | 957 | 1877 |
| 21 | [Barrow Neurological Institute](https://www.tamtam.ai/c/barrow-neurological-institute) (barrowneuro.org)
Preserving and protecting thoughts, memories, dreams, personalities, and movement to prioritize what matters most | Hospitals and Health Care | ๐บ๐ธ Phoenix | 918 | 1962 |
| 22 | [Southwest Behavioral & Health Services](https://www.tamtam.ai/c/southwest-behavioral-and-health-services) (sbhservices.org)
The company provides compassionate care and services in behavioral health, focusing on housing, prevention, outpatient services, and treatment of co-occurring disorders | Mental Health Care | ๐บ๐ธ Phoenix | 912 | 1969 |
| 23 | [Terros Health](https://www.tamtam.ai/c/terros-health) (terroshealth.org)
Health care company specializing in mental health and substance use treatment, providing primary care to help individuals live in recovery and save lives | Hospitals and Health Care | ๐บ๐ธ Phoenix | 905 | 1969 |
| 24 | [National Bank of Arizona](https://www.tamtam.ai/c/national-bank-of-arizona) (nbarizona.com)
This company provides exceptional customer service and builds local relationships by offering financial services through nearly 500 local financial centers | Banking | ๐บ๐ธ Phoenix | 833 | 1984 |
| 25 | [Adelante Healthcare](https://www.tamtam.ai/c/adelante-healthcare) (adelantehealthcare.com)
A non-profit organization operating nine community health centers in Central Arizona, providing primary and preventative healthcare to over 85,000 individuals annually | Hospitals and Health Care | ๐บ๐ธ Phoenix | 550 | 1979 |
| 26 | [Arizona Financial Credit Union](https://www.tamtam.ai/c/arizona-financial-credit-union) (arizonafinancial.org)
Arizona Financial offers consumer and small business banking services, with a focus on convenience, local expertise, and commitment to strengthening local economies | Banking | ๐บ๐ธ Phoenix | 545 | 1936 |
| 27 | [Valley Metro RPTA](https://www.tamtam.ai/c/valley-metro-rpta) (valleymetro.org)
Develop and deliver integrated regional transit systems through collaboration with agencies and partnerships to improve quality of life and environment. | Ground Passenger Transportation | ๐บ๐ธ Phoenix | 426 | 1985 |
| 28 | [Connections Health Solutions](https://www.tamtam.ai/c/connections-health-solutions) (connectionshs.com)
A pioneer in behavioral health crisis care, providing timely and effective services to stabilize and treat individuals with mental health and substance use diagnoses | Mental Health Care | ๐บ๐ธ Phoenix | 424 | 2009 |
| 29 | [Central Arizona Project](https://www.tamtam.ai/c/central-arizona-project) (centralarizonaproject.com)
A dedicated team delivers Colorado River water to central and southern Arizona, offering competitive salaries, benefits, and a focus on employee development | Utilities | ๐บ๐ธ Phoenix | 412 | 1971 |
| 30 | [OneAZ Credit Union](https://www.tamtam.ai/c/oneaz-credit-union) (oneazcu.com)
A credit union in Arizona dedicated to improving lives through personal and business banking solutions, community involvement, and member-owned benefits | Banking | ๐บ๐ธ Phoenix | 409 | 1951 |
## 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 11, 2026.
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## The same list elsewhere in United States
- [Critical infrastructure operators in the United States](https://www.tamtam.ai/l/critical-infrastructure-operators-united-states) (5,801)
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- [Critical infrastructure operators in Alabama](https://www.tamtam.ai/l/critical-infrastructure-operators-alabama) (186)
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- [Critical infrastructure operators in Colorado](https://www.tamtam.ai/l/critical-infrastructure-operators-colorado) (137)
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- [Critical infrastructure operators in Virginia](https://www.tamtam.ai/l/critical-infrastructure-operators-virginia) (131)
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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-phoenix