As of my last knowledge update in September 2021, some of the top insurance companies globally include:
1. **Berkshire Hathaway**: Often considered one of the largest and most successful insurance companies in the world, offering a wide range of insurance and reinsurance products.
2. **Ping An Insurance**: A Chinese conglomerate that provides a variety of insurance, financial, and healthcare services.
3. **Allianz**: A German multinational financial services company that offers insurance and asset management services.
4. **AXA**: A French multinational insurance firm that operates in various regions and offers insurance, investment management, and other financial services.
5. **China Life Insurance**: Another major Chinese insurance company, primarily focusing on life insurance and related financial services.
6. **Prudential plc**: A British multinational life insurance and financial services company with a global presence.
7. **Japan Post Insurance**: A Japanese company that provides life insurance, non-life insurance, and postal financial services.
8. **MetLife**: An American insurance company offering life insurance, annuities, employee benefits, and asset management services.
9. **Zurich Insurance Group**: A Swiss insurance company that operates globally and provides a wide range of insurance products.
10. **UnitedHealth Group**: An American health insurance and healthcare services company, also involved in offering health technology solutions.
Please note that the ranking of insurance companies can change over time based on various factors such as financial performance, market conditions, and mergers/acquisitions. It’s recommended to check more recent sources for the latest information on the top insurance companies.