Top Insurance Companies

Aon is in the Business of Better Decisions Our world is changing. Uncertainty has become the new constant in a world that is increasingly volatile and where new business models are rising and falling at an ever-increasing speed. With this change comes a pressing need for businesses to make important decisions more often. Some will be easy, others difficult. There’ll be some that may seem small, but all have the potential to have a profound impact. At Aon, we partner with our clients to help shape business decisions for the better. We are not tied to a traditional way of doing things. That is why we can best prepare organizations to manage the challenges of the volatile world in which we now live. We give our clients the clarity and confidence to make better decisions that protect and grow their businesses. A New Way to Do Business We are dedicated to helping clients meet unmet or unfulfilled needs stemming from today’s rapidly changing, increasingly complex and interconnected challenges. Aon is positioned to deliver innovative solutions that address those unmet client needs and become the partner of choice for all businesses — no matter industry, size or geography — looking to make better and more informed decisions. That is why we deliver: Advanced Analytical Capabilities — through the combination of leading technologies, extensive data sources and leading decision-science capabilities. This means our clients are better informed. Distinctive Client Insight — in the form of future-focused advisory services and more extensive subject matter expertise across segments and geographies. This means our clients are better advised. Superior Outcomes — by accelerating innovation that improves access to new sources of capital and introduces relevant solutions that protect and grow our client’s business. This means our clients are able to make better decisions. To do this, we focus on unmet needs in four key areas where we know we can help our clients the most. Navigating New Forms of Volatility Building a Resilient Workforce Rethinking Access to Capital Addressing the Underserved Investing in Our Future Aon is well-positioned to take on today’s challenges. We are also committed to investing in our future and will continue to invest in both our people and our capabilities to produce superior outcomes for our clients. Aon will help our clients to be better informed, better advised and able to make better decisions on the issues that matter most to them. That is because we are building a business that defies traditional categorization. We are establishing Aon firmly in the business of better decisions; a trusted partner to help our clients navigate today’s challenges and together tackle some of the greatest issues we’ve ever faced.

Insurance Australia Group Limited (IAG) is the parent company of a general insurance group with controlled operations in Australia, New Zealand, Thailand and Vietnam, employing more than 15,000 people. Its businesses underwrite over $11 billion of premium per annum, selling insurance under many leading brands, including: NRMA Insurance, CGU, SGIO, SGIC, Swann, WFI and Lumley Insurance (Australia); NZI, State, AMI and Lumley Insurance (New Zealand); Safety and NZI (Thailand); and AAA Assurance (Vietnam). IAG also has interests in general insurance joint ventures in Malaysia, India and China.

Gallagher is a global leader in insurance, risk management, and consulting services, where champions of The Gallagher Way shape the future every day. Our 70,000+ employees across the globe deliver tailored solutions that help businesses grow, communities thrive, and people prosper. Rooted in a legacy of trust, integrity, and excellence, we empower our people to build careers with purpose—whether in brokerage, benefits and HR consulting, or on our corporate team. At Gallagher, every champion makes an impact. We are honored to be the only insurance broker recognized by the Ethisphere Institute as a World's Most Ethical Company.

Marsh (NYSE: MRSH) — formerly Marsh McLennan — is a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information, visit corporate.marsh.com, or follow us on LinkedIn and X.  Learn more about how we're evolving and building a new, expanded Marsh brand to represent all of our capabilities: https://www.marshmclennan.com/news-events/2025/october/marshmclennan-and-its-businesses-will-brand-as-marsh.html At Marsh, you can be your best here. Explore career opportunities on our global careers site: https://careers.marsh.com/global/en

We're a leading global insurance organization with operations in approximately 80 countries and jurisdictions. We provide a wide range of property casualty insurance, life insurance, retirement solutions, and other financial services to support our clients in business and in life through our General Insurance, Life & Retirement and Investments business units. What unites us across all of these offerings is our commitment to helping individuals, businesses and communities prepare for and respond to times of uncertainty. Whether serving those facing natural disasters or millions of Americans striving for a financially secure retirement, we have the specialist expertise to help clients better manage risk. We’re also committed to doing the right thing for our people and the communities where we work and live. It’s why we seek to offer what matters to our ever-diversifying team - like flexible and creative work environments, professional growth opportunities and forums to advocate for one another and incite change. We encourage employees to give back to the causes they care most about, supporting these efforts through our Volunteer Time Off and Matching Grants Programs.

We help prevent injuries and get New Zealanders and visitors back to everyday life if they’ve had an accident.

AA Insurance is an independently operated, New Zealand-based joint venture between the New Zealand Automobile Association (NZAA) and Vero Insurance New Zealand Limited (VINZL). Since 1994 we have demonstrated trusted expertise in home, contents and car insurance in New Zealand, and in 2018 introduced commercial small business insurance. We underwrite our own policies and sell direct to New Zealanders. Our more than 700 staff look after over 385,000 customers with around 745,000 policies. We proudly partner with Eden Park, support youth charity Blue Light, and have been consistently recognised by: Reader’s Digest Most Trusted Brands (since 2011), IBM Kenexa Best Workplaces Survey (since 2008), Canstar Blue Most Satisfied Customers (2013-2018), and the Colmar Brunton Corporate Reputation Index (since 2015) that recognises New Zealand’s most successful companies.

QBE is a general insurer and reinsurer with a proud history that originated in Australia more than 135 years ago and today sees QBE employ more than 13,000 people across 26 countries around the world. QBE provides a broad range of insurance products to personal, business, corporate and institutional customers, is listed on the Australian Stock Exchange and headquartered in Sydney.

Marsh Risk is a business of Marsh (NYSE: MRSH) — formerly Marsh McLennan — a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information about Marsh Risk, visit marsh.com, or follow us on LinkedIn and X. Learn more about how we're evolving and building a new, expanded Marsh brand to represent all of our capabilities: https://www.marshmclennan.com/news-events/2025/october/marshmclennan-and-its-businesses-will-brand-as-marsh.html This page will be closing soon. Follow Marsh on Glassdoor to stay connected.