Sovereign Assurance Company Limited (branded as Sovereign) was a New Zealand-based financial services company that provided life and health insurance, home loans, investment and superannuation products.

The initiative was designed and developed by the United Nations Environment Program Finance Initiative (UNEP FI), and is a set of aspirational and voluntary guidelines for investment entities wishing to address environmental, social, and corporate governance (ESG) issues.

On 21 September 2017 CBA announced that it had agreed to sell Sovereign, as well as its Australian insurance business (CommInsure) to AIA Group for AUD $3.8 billion.

[2] AIA New Zealand and Sovereign continued to operate as two separate brands until 5 August 2019.

From this date onwards the combined business has traded as AIA New Zealand Limited.