MS&AD to merge Mitsui Sumitomo, Aioi Nissay Dowa by April 2027

The merged entity could equate to the Japanese insurer holding the top market share.

MS&AD Insurance Group Holdings said it plans to merge its two core non-life insurance subsidiaries, Mitsui Sumitomo Insurance Co., Ltd. and Aioi Nissay Dowa Insurance Co., Ltd., with the merger scheduled for April 2027. 

The decision was made at a Board of Directors meeting on 28 March.  

The merger aims to strengthen MS&AD’s domestic non-life insurance business and support the group's vision of becoming a world-leading insurance and financial entity. 

The company plans to enhance compliance measures following recent price-fixing and information leakage incidents. 

The merged entity could equate to the Japanese insurer holding the top market share in the non-life insurance sector.