| # | Company | Employees |
|---|---|---|
| 1 |
Commonwealth Bankcommbank.com.au
Leading provider of financial services in Australia, offering banking, funds management, insurance, investment, and sharebroking products to help individuals manage their finances |
47,706 |
| 2 |
Telstratelstra.com.au
Providing technology and content solutions for a connected future, with a focus on customer experience and Australia's largest mobile network |
35,493 |
| 3 |
Macquarie Groupmacquarie.com
Global financial services organization empowering people to innovate and invest for a better future in 34 markets Visit wwwmacquariecom for more information |
20,757 |
| 4 |
Westpacwestpac.com.au
A major banking institution in Australia and New Zealand, offering a wide range of financial services globally with a focus on customer prosperity |
16,224 |
| 5 |
Westpac Groupwestpac.com.au
Leading financial institution offering banking, wealth management, and customer-focused services across Australia, Asia, UK, and the US. |
14,973 |
| 6 |
QBE Insuranceqbe.com
An international insurer offering commercial, personal, and specialty products in 27 countries to help manage risks and embrace change |
14,280 |
| 7 |
IAGiag.com.au
Leading general insurance company in Australia and New Zealand, providing coverage under various brands, supporting communities in preventing and recovering from risks since 1851 |
12,798 |
| 8 |
Ramsay Health Careramsayhealth.com
Provider of private hospitals, clinics, mental health, diagnostics, and community care services across multiple countries with extensive healthcare staff. |
11,896 |
| 9 |
Sydney Trainstransport.nsw.gov.au
A leading transport organization in Sydney operates reliable trains, focusing on customer service, career progression, and maintaining a safe, efficient network |
6,549 |
| 10 |
Origin Energyoriginenergy.com.au
Leading Australian energy company providing electricity, natural gas, solar, and LPG while focusing on affordability, sustainability, and carbon emissions reduction. |
6,250 |
| 11 |
AGLagl.com.au
A leading energy company in Australia, dedicated to transforming how energy is produced, shared, and consumed through sustainability and innovation |
5,492 |
| 12 |
NSW Police Forcepolice.nsw.gov.au
A leading police force in New South Wales, Australia, serving a population of seven million across land, sea, and air with community-based policing services |
3,694 |
| 13 |
Healius Limitedhealius.com.au
Provides affordable, accessible specialty diagnostic and pathology services across Australia through extensive laboratories and patient collection centers. |
3,531 |
| 14 |
Calvary Health Carecalvarycare.org.au
A charitable Catholic health care organization founded in 1885, providing compassionate and quality services to the most vulnerable populations across Australia |
3,336 |
| 15 |
St.George Bankstgeorge.com.au
Provides retail and business banking services to over 2.6 million customers with extensive branch network and specialist financial advice. |
3,327 |
| 16 |
Allianz Australiaallianz.com.au
Provider of personal, commercial, and corporate insurance products including general, workers' compensation, and life insurance in Australia and New Zealand. |
3,179 |
| 17 |
GenesisCaregenesiscare.com
Provider of integrated cancer care globally, focusing on personalized treatment experiences and access to radiotherapy, diagnostics, oncology, surgery, and clinical trials |
3,134 |
| 18 |
NSW Ambulanceambulance.nsw.gov.au
Provider of high quality out-of-hospital clinical care to over 725 million people in NSW through emergency responses and community safety programs |
2,840 |
| 19 |
APA Groupapa.com.au
Ownership and management of a diverse $26 billion energy infrastructure portfolio delivering energy solutions across all Australian states and territories. |
2,804 |
| 20 |
Estia Healthestiahealth.com.au
Provider of compassionate residential aged care with 70+ homes across Australia, delivering exceptional care and enriching experiences for residents. |
2,737 |
| 21 |
Sonic Healthcaresonichealthcare.com
Internationally renowned healthcare provider specializing in pathology, radiology, and primary care with operations in multiple countries and a focus on quality medical diagnostic services |
2,328 |
| 22 |
Qubeqube.com.au
Largest integrated provider of import and export logistics services across Australia, New Zealand, and Southeast Asia with extensive supply chain infrastructure. |
2,301 |
| 23 |
Reserve Bank of Australiarba.gov.au
Australia's central bank contributes to price stability, full employment, and economic prosperity through setting cash rates, managing banknotes, and providing banking services |
2,139 |
| 24 |
I-MED Radiology Networki-med.com.au
Australia's leading diagnostic imaging network offering a wide range of medical imaging and radiology services across 240 clinics nationwide |
2,033 |
| 25 |
Transgridtransgrid.com.au
The company operates and maintains high voltage transmission infrastructure in NSW and the ACT, leading the transition to clean energy for a sustainable future |
1,993 |
| 26 |
ASXasx.com.au
Leading global exchange offering trading, clearing, settlement, market insights, connectivity, and depository services across major asset classes with world-class financial infrastructure |
1,991 |
| 27 |
ING Australiaing.com.au
This company is a part of the ING Group, offering simple and value-driven banking products, 24/7 customer support, and a focus on improving customer's lives |
1,768 |
| 28 |
Western Sydney Local Health Districtnsw.gov.au
Delivering comprehensive healthcare to over a million residents in Western Sydney through top-notch clinical expertise, research, and compassionate care |
1,764 |
| 29 |
Westpac Institutional and Businesswestpac.com.au
A partner in nation-building development, supporting clients in transitioning to net zero emissions and driving innovation and efficiency |
1,754 |
| 30 |
Colonial First Statecfs.com.au
provides superannuation, investment, and retirement products with expertise in Australian and global shares, property, fixed interest, and alternative assets |
1,523 |
| 31 |
Alinta Energyalintaenergy.com.au
A leading Australian utility providing gas and electricity generation, retail, and wholesale services with a focus on renewable energy development |
1,342 |
| 32 |
Perpetual Limitedperpetual.com.au
Providing asset management, wealth management, and trustee services to clients across Australia, Asia, Europe, UK, and the United States. |
1,309 |
| 33 | 1,301 | |
| 34 |
MLC Australiamlc.com.au
A financial services provider offering investments, superannuation, and wealth management solutions with a focus on empowering Australians financially throughout their lives |
1,234 |
| 35 |
Sydney Metrosydneymetro.info
Revolutionizing Sydney's public transport with a network of four metro lines, 46 stations, and 113km of new rail by 2030 |
1,103 |
| 36 |
eftpos Payments Australiaeftposaustralia.com.au
Australia's debit card network processed 2 billion transactions in 2017, totaling $130 billion, offering a convenient payment solution for customers |
916 |
| 37 |
Ubankubank.com.au
digital platform providing real-time financial insights, spending tracking, and saving tools to help users manage money and achieve financial goals. |
914 |
| 38 |
NSW Justice Health & Forensic Mental Health Networknsw.gov.au
Delivering healthcare to adults and young people in contact with forensic mental health and criminal justice systems in NSW |
898 |
| 39 |
Bupa Aged Care Australiabupaagedcare.com.au
Leading operator of residential aged care homes across Australia, with over 6000 committed employees providing quality care and innovative dementia support |
841 |
| 40 |
WaterNSWwaternsw.com.au
The company manages and protects water sources, supplies bulk water, operates water systems, plans and delivers infrastructure, and provides customer water transaction services |
807 |
| 41 |
Rabobank Australiarabobank.com.au
Specialist in food and agribusiness banking, providing customised solutions to clients globally, with a focus on sustainability, employee engagement, and diversity |
796 |
| 42 |
Cuscal Limitedcuscal.com
A payments and regulated data services provider in Australia, enabling banks, mutuals, corporates, and fintechs with innovative technology solutions for seamless customer connections |
783 |
| 43 |
Australian Digital Health Agencydigitalhealth.gov.au
Leading national efforts to improve health outcomes in Australia through delivery of digital healthcare systems and driving uptake of digital health technologies |
782 |
| 44 |
Superloopsuperloop.com
Superloop unleashes the possibilities of the internet with carrier-grade networks, providing high-performance connectivity services for residential customers, businesses, and corporations in Australia |
771 |
| 45 |
Challenger Limitedchallenger.com.au
Management of investment funds and life insurance products focused on providing customers with secure and reliable retirement income solutions. |
718 |
| 46 |
Macquarie Technology Groupmacquarietechnologygroup.com
An Australian company specializing in data center, cloud, cyber security, and telecom services for mid-large businesses and government clients Known for exceptional customer service |
707 |
| 47 |
Tyro Paymentstyro.com
Provides integrated payment, banking, and lending solutions tailored for Australian merchants in hospitality, retail, services, and health sectors. |
657 |
| 48 |
CommSeccommsec.com.au
Australia's largest online broker providing online trading, cash management, margin lending, and international share trading Stay updated with live market news and expert analysis |
639 |
| 49 |
Chris O'Brien Lifehousemylifehouse.org.au
A not-for-profit cancer hospital offering comprehensive care, advanced treatments, holistic support, and cutting-edge research to improve patient outcomes and experiences |
638 |
| 50 |
Whiddonwhiddon.com.au
A not-for-profit organization providing award-winning aged care services in NSW and QLD, focusing on individual needs and community connections |
611 |
| 51 |
Australian Payments Plusauspayplus.com.au
An integrated Australian payment entity formed by BPAY Group, eftpos, and NPP Australia to create competitive, coordinated payment solutions for the future |
559 |
| 52 |
Allianz Retire+allianzretireplus.com.au
An Australian company offering retirement products that combine insurance expertise with investment knowledge to provide security and stability for retirees |
63 |
| 53 |
Zurich Australian Insurance Limitedzurich.com.au
Global financial services company in Australia offering insurance and investments under a single brand |
24 |
| 54 |
UBS AG, Australia Branch
An investment banking company located in Sydney, Australia, offering a range of financial services from its Chifley Tower office |
12 |
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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 Oct 24, 2026.
More company lists in Sydney
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- Education Administration Programs companies in Sydney 26
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The same list elsewhere in Australia
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- Critical infrastructure operators in New South Wales 109
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