Who we are

For over 135 years, Thomas Miller has been an international provider of market-leading insurance services. Most of the businesses we own or manage are acknowledged leaders in their chosen markets.

We are a purpose-led organisation. We pride ourselves on delivering expert service to customers of the businesses we own and manage. In Thomas Miller, we run a variety of businesses, some of which have more similar characteristics than others, but in all our business areas, service is paramount.

The power of service is at the heart of our culture and values. We have always sought to perform in line with this purpose, demanding high standards both in terms of behaviour and achievement. Service includes service to our customers, but also to each other in the organisation and all those we interact with in our business life. At Thomas Miller, we maintain constructive, supportive relationships and aim to achieve the highest performance standards in all we do.

Our principal activities include:

  • Management services for transport and professional indemnity insurance mutuals
  • Managing general agency
  • Professional services, including technical services, legal services, captive and claims management
  • Investment management for institutions


The growth of Thomas Miller for well over a century has been based on prudent financial strategy, the highest standard of risk management and sophisticated investment planning.


Gross Written Premium

$1.6 billion 

Gross Written Premium

Thomas Miller manages over $1.6 billion of gross written premium for the Transport, Specialty and Professional Services industries in the mutual, MGA and captive markets.

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Explore Thomas Miller

Thomas Miller’s origins are in the provision of management services to mutual organisations, particularly in the international transport and professional indemnity sectors; where today we manage a large percentage of the foremost insurance mutuals.