The proposed transaction is expected to deepen cooperation between the companies across group medical and general insurance, subject to the satisfaction of multiple closing conditions.
Heibutzki will succeed Tom Wilson as Thailand country manager, while Allianz Re executive Sanghun Park is set to take over the group's general insurance business.
Ratings for Mitsui Sumitomo Insurance and US operating companies; Aioi Nissay Dowa Insurance; and Aioi Nissay Dowa Insurance (China) all affirmed with a stable outlook.