These Sydney-based companies primarily operate in telecommunications, software development, insurance, and professional services, with a mix of large established corporations and mid-sized firms. Noteworthy examples include Telstra, a telecommunications giant, and Atlassian, known for its collaborative software like Jira. TAL Australia specializes in life insurance, while Chartered Accountants Australia and New Zealand supports financial professionals. Employment Hero offers an all-in-one HR platform, and Outsourced Doers provides virtual marketing assistants globally.
A clear pattern among these companies is their strong presence in the technology sector, encompassing both telecommunications and software development, alongside a robust financial and professional services industry. This indicates a diversified yet interconnected business landscape in Sydney.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
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 | |||
| 2 |
Atlassianatlassian.com
A global team creating tools like Jira, Confluence, Bitbucket, and Trello to empower teams worldwide to collaborate effectively and innovate |
21,044 | |||
| 3 |
TAL Australiatal.com.au
A leading life insurance specialist in Australia, protecting over 5 million customers through various channels and part of the Dai-ichi Life Group |
2,802 | |||
| 4 |
Chartered Accountants Australia and New Zealandcharteredaccountantsanz.com
Representation and support for over 136,000 financial professionals to make a difference through expertise, ethical standards, education, and advocacy on a global scale |
1,869 | |||
| 5 |
Employment Heroemploymenthero.com
all-in-one platform supporting recruitment, HR, compliance, and payroll to help businesses manage and empower their employees effectively |
1,835 | |||
| 6 |
Outsourced Doersoutsourceddoers.com
Outsourced Doers provides virtual marketing assistants to entrepreneurs globally, helping them save time and grow their businesses cost-effectively |
1,821 | |||
| 7 |
HCF Australiahcf.com.au
A leading Australian not-for-profit health fund providing quality cover and healthcare solutions, prioritizing member care, innovation, and employee well-being |
1,620 | |||
| 8 |
Eucalyptuseucalyptus.health
Digital healthcare platform offering telehealth services for men's health, fertility, dermatology, weight loss, and menopause, with a focus on high-quality care and patient safety |
888 | |||
| 9 |
Isentiaisentia.com
Leading media intelligence company in Asia-Pacific, providing insights on brand reputation since 1982 Acquired by Access Intelligence in 2021 for global expansion |
881 | |||
| 10 |
Servcorpservcorp.com
Servcorp offers flexible workspace solutions including hot desks, dedicated desks, virtual offices, and office spaces in over 150 locations worldwide |
880 | |||
| 11 |
ACS (Australian Computer Society)acs.org.au
This company is a professional association for Australia's technology sector, focusing on fostering community, developing skills, guiding careers, and supporting skilled technology migrants |
856 | |||
| 12 |
SAI Globalinfostore.saiglobal.com
Provider of global standards, technical information, and regulations supporting operational efficiency, business growth, and market entry for organizations. |
825 | |||
| 13 |
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 | |||
| 14 |
LEAP Legal Softwarecareers.leaplegalsoftware.com
Provides an all-in-one productivity platform designed for legal professionals to enhance efficiency and profitability across multiple countries. |
719 | |||
| 15 |
Lux Groupluxuryescapes.com
An Australian ecommerce group founded in 2010, operating multiple websites Committed to delivering innovative and exceptional experiences to over six million subscribers |
706 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
FOX SPORTS Australiafoxsports.com.au
Australia's top sports broadcaster, delivering live coverage of major sporting events, innovative broadcast technology, and digital sports content for fans nationwide |
623 | |||
| 17 |
ELMO Softwareelmosoftware.com.au
Provider of AI-driven HR and payroll software unifying recruitment, onboarding, learning, and payroll with secure, scalable, locally supported solutions. |
609 | |||
| 18 |
The Australiantheaustralian.com.au
A premier source for national and international news, offering in-depth coverage of business, politics, media, education, arts, lifestyle, and IT Providing exclusive content and analysis |
588 | |||
| 19 |
Infomediainfomedia.com.au
Provides SaaS and DaaS platforms for automotive OEMs and dealers to manage vehicle lifecycle, parts sales, service, and customer experience globally. |
574 | |||
| 20 |
Insight Timerinsighttimer.com
The company provides a platform with a large community, teachers, and a vast library of free guided meditations |
559 | |||
| 21 |
Standards Australiastandards.org.au
Development of standards supporting safety, innovation, infrastructure, and technology, collaborating with industry, government, and community for national progress. |
547 | |||
| 22 |
Mamamiamamamia.com.au
A leading Australian women's media brand providing content through various platforms to engage and empower women of all generations |
534 | |||
| 23 |
Are Media Pty Ltdaremedia.com.au
An omnichannel content company in Australia for women, creating influential and inspiring content through various platforms to drive positive change |
493 | |||
| 24 |
The College of Law Australiacollaw.edu.au
A leading provider of practical legal education, offering programs for all career stages, professional development, postgraduate specializations, and legal business management |
485 | |||
| 25 |
AI-Mediaai-media.tv
Specialises in AI-powered live and recorded captioning and translation solutions, enhancing accessibility and inclusivity for global broadcasters and enterprises. |
417 | |||
| 26 |
Peninsula Australiapeninsulagrouplimited.com.au
Trusted advisor for small businesses worldwide, providing HR, health & safety, and employment relations support to free up time for growth #SuccessStartsHere |
412 | |||
| 27 |
Airtaskerairtasker.com
A tech company empowering individuals to monetize their skills through a marketplace, creating job opportunities globally with a focus on inclusivity and growth |
389 | |||
| 28 | 386 | ||||
| 29 |
Healthylifehealthylife.com.au
A digital platform that makes health, wellness, and pharmacy needs more accessible by providing trusted products and services from experts |
383 | |||
| 30 |
PetSure (Australia)petsure.com.au
Specializing in providing financial assistance for pet health care, the organization values pets, people, and passion in offering choices for pet protection |
344 | |||
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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 11, 2026.
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- Corporate groups and holding companies in Sydney 57
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