Fitch Ratings has affirmed the Insurer Financial Strength ("IFS") ratings of Aviva's main UK life insurance operating subsidiaries at 'AA'.
The agency has also affirmed the group's UK non-life operating subsidiaries at IFS AA-' (AA minus).
The Outlook for all ratings is Stable.
Fitch said the rating actions follow the announcement earlier today of an agreed bid by the group to acquire AmerUs Group Co, a US life insurance group.
The ratings agency said the acquisition of AmerUs will give Aviva a more significant presence in the US, the world's largest life insurance market with attractive growth opportunities.
It added that the acquisition complements its strong business position in Europe and increases the group's geographical diversification.
