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Critical infrastructure operators headquartered in San Diego

Tamtam tracks 33 critical infrastructure operators headquartered in San Diego. This list ranks all of them by number of employees on LinkedIn, led by LPL Financial, Scripps Health and Sharp HealthCare. Their median headcount is 663. Half of them were founded in 1962 or later.

馃嚭馃嚫 San Diego33 companiesUpdated Nov 2, 2026
#CompanyIndustryHeadquarters EmployeesFounded
1
LPL Financiallpl.com

Wealth management firm supporting financial advisors and institutions through investment solutions, fintech tools, practice management services, and custody of trillions in brokerage assets.

Financial Services 馃嚭馃嚫 San Diego 14,788 1989
2
Scripps Healthcareers.scripps.org

Non-profit healthcare system providing acute hospitals, outpatient centers, home health, hospice, and advanced clinical research in San Diego.

Hospitals and Health Care 馃嚭馃嚫 San Diego 11,885 1924
3
Sharp HealthCarecareers.sharp.com

Not-for-profit healthcare system offering acute, specialty hospitals, medical groups, and health plan with advanced, compassionate patient care services.

Hospitals and Health Care 馃嚭馃嚫 San Diego 11,594 1946
4
UC San Diego Healthemployment.ucsd.edu

A leading academic health system in San Diego region, offering outstanding patient care, cutting-edge research, medical education, and community health programs

Hospitals and Health Care 馃嚭馃嚫 San Diego 10,962 1966
5
Guild Mortgageguildmortgage.com

A leading independent mortgage provider, prioritizing customer service with commitment to on-time closings and tailored loan options for homebuyers

Financial Services 馃嚭馃嚫 San Diego 5,337 1960
6
Rady Children's Hospital-San Diegorchsd.org

Leading pediatric health care system with a 511-bed hospital, 40+ locations, and a focus on serving San Diego and surrounding counties Nonprofit organization relying on donations

Hospitals and Health Care 馃嚭馃嚫 San Diego 4,856 1954
7
San Diego Gas & Electricsdge.com

provides clean, safe, and reliable energy to improve lives in San Diego and southern Orange counties with over 4,000 employees

Utilities 馃嚭馃嚫 San Diego 2,822 1881
8
Semprasempra.com

A leading energy infrastructure company helping to electrify and decarbonize major markets in North America through sustainable practices and operational excellence

Utilities 馃嚭馃嚫 San Diego 2,572 n/a
9
EDF Renewables North Americaedf-re.com

Development and operation of wind, solar, and storage projects with onsite energy solutions for commercial and industrial customers.

Renewable Energy Power Generation 馃嚭馃嚫 San Diego 1,725 1987
10
Family Health Centers of San Diegofhcsd.org

Delivering comprehensive behavioral health and primary care services to diverse, underserved populations in San Diego County for over 50 years

Hospitals and Health Care 馃嚭馃嚫 San Diego 1,474 1970
11
California Bank & Trustcalbanktrust.com

A leading California bank with over $12 billion in assets offering a wide range of financial services to businesses and individuals

Banking 馃嚭馃嚫 San Diego 1,432 n/a
12
Axos Bankaxosbank.com

This company empowers consumers and businesses in managing their financial lives through banking, borrowing, investing, and planning with an exceptional team

Banking 馃嚭馃嚫 San Diego 1,430 2000
13
ICW Groupicwgroup.com

National multi-line property and casualty insurance company offering comprehensive coverage through multiple carriers to protect customers and support independent agents.

Insurance 馃嚭馃嚫 San Diego 1,242 1972
14
Mutual of Omaha Mortgagemutualmortgage.com

A trusted mortgage company with strong leadership, cutting-edge technology, and superior support for an easy and efficient loan process Proudly serving customers for over 100 years

Financial Services 馃嚭馃嚫 San Diego 1,104 2016
15
Sempra Infrastructuresemprainfrastructure.com

The company delivers energy in North America, committed to building future energy systems for a better world

Oil and Gas 馃嚭馃嚫 San Diego 968 n/a
16
SHARP MEMORIAL HOSPITAL

A medical practice company located in San Diego, California, specializing in providing healthcare services at Sharp Memorial Hospital

Medical Practices 馃嚭馃嚫 San Diego 768 1955
17
San Diego Metropolitan Transit System (MTS)sdmts.com

provides extensive bus and trolley services with a focus on sustainability, serving millions annually in the San Diego region.

Urban Transit Services 馃嚭馃嚫 San Diego 663 1886
18
San Diego Police Departmentsandiego.gov

The San Diego Police Department aims to protect and serve residents, reduce crime, improve quality of life, and promote accountability in policing

Law Enforcement 馃嚭馃嚫 San Diego 644 1889
19
San Diego County Credit Unionsdccu.com

San Diego County Credit Union is a member-owned, not-for-profit financial institution offering superior products and services with community support and involvement

Banking 馃嚭馃嚫 San Diego 633 1938
20
Port of San Diegoportofsandiego.org

Manage 34 miles of San Diego Bay waterfront, balancing maritime, development, public safety, and environmental efforts to support community and business.

Government Administration 馃嚭馃嚫 San Diego 553 1962
21
Mission Fed Credit Unionmissionfed.com

Serving San Diego with checking, savings, loans, credit cards, extensive branches, fee-free ATMs, mobile banking, and community partnerships.

Banking 馃嚭馃嚫 San Diego 545 1961
22
San Diego Association of Governments (SANDAG)sandag.org

A transportation and planning agency in San Diego region, dedicated to improving quality of life through data-driven decision-making and stakeholder collaboration

Government Administration 馃嚭馃嚫 San Diego 455 1966
23
Cal Coast Credit Unioncalcoastcu.org

A community-focused credit union in San Diego and Riverside counties, offering financial services, support for educators, and commitment to giving back

Banking 馃嚭馃嚫 San Diego 445 1929
24
San Diego County Regional Airport Authoritysan.org

An independent agency managing San Diego International Airport, planning for future air transportation needs, and overseeing airport land use

Airlines and Aviation 馃嚭馃嚫 San Diego 430 n/a
25
Bridge Home Health & Hospicebridgehh.com

A leading California provider of post-acute healthcare services, committed to delivering high-quality home-based patient care with respect and excellence

Hospitals and Health Care 馃嚭馃嚫 San Diego 389 2013
26
Alvarado Hospital Medical Centeralvaradohospital.com

Pioneering medical center in San Diego offering advanced healthcare services with over 450 physicians and a variety of specialized programs for patients

Hospitals and Health Care 馃嚭馃嚫 San Diego 387 1972
27
Palomar Medical Center

Health care provider in North San Diego County with multiple state-of-the-art hospitals, birth centers, and clinics offering a full spectrum of services

Hospitals and Health Care 馃嚭馃嚫 San Diego 333 n/a
28
Imaging Healthcare Specialistsimaginghealthcare.com

Provider of high-quality medical imaging services in San Diego and Riverside Counties, offering advanced technology, specialized expertise, and exceptional customer service

Hospitals and Health Care 馃嚭馃嚫 San Diego 316 n/a
29
San Diego County Water Authoritysdcwa.org

A regional public agency in San Diego delivers water supplies to retail providers, sustaining the economy and quality of life for residents

Utilities 馃嚭馃嚫 San Diego 284 1944
30
Sempra Renewablessemprarenewables.com

A leading developer of clean energy solutions, with nearly 2,600 MW of renewable generating capacity fuelled by sun and wind across 11 states

Renewable Energy Semiconductor Manufacturing 馃嚭馃嚫 San Diego 41 n/a
31
Redwireredwire.com

A business class Internet Service Provider offering fast installations and reliable network services to small to medium tenants in Southern California

Technology, Information and Internet 馃嚭馃嚫 San Diego 19 1999
32
Axosaxos.com

A financial services company that enables individuals and businesses to conveniently bank, borrow, invest, and plan their financial activities

Financial Services 馃嚭馃嚫 San Diego 9 2000
33
Sempra U.S. Gas & Power, LLCsemprausgp.com

Collaborating with partners and communities to develop innovative clean energy solutions for future challenges

Utilities 馃嚭馃嚫 San Diego 2 n/a

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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 2, 2026.

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