Sompo Japan outlook holds as Aspen deal raises execution risk

The agency also sees equity exposure from domestic stock holdings declining.

Sompo Japan Insurance Inc. (SJ) (Japan) and its subsidiaries’ outlook is stable but will also likely see a further improvement driven by overseas expansion, according to AM Best.

The rating agency said the outlook reflects its view that Sompo Japan’s business profile will strengthen over the near to medium term, supported by continued global diversification and the recent acquisition of Aspen Insurance Holdings Limited, completed on 24 February 2026 through Sompo International Holdings Ltd.

AM Best expects the Aspen deal to expand Sompo Japan’s scale and deepen its capabilities in specialty lines, strengthening its position in global property and casualty reinsurance markets. 

The agency noted that overseas operations already account for about 45% of consolidated insurance revenue and the majority of adjusted profit in fiscal year 2024, indicating a shift away from reliance on the domestic Japanese market.

However, AM Best said the pace and success of post-merger integration, as well as risk management of the growing overseas portfolio, will be key factors in future assessments.

Looking ahead, AM Best also expects Sompo Japan’s exposure to equity risk from its domestic stock holdings to decline gradually, as the company continues to reduce strategic equity positions. 

Its conservative financial leverage and strong financial flexibility are expected to remain supportive of its overall credit profile.