Concern was raised about AFLAC's positions in hybrid securities and preferred shares of financial institutions that have been hit by the recent crisis.
AFLAC made claim paying errors of $16.1 million, underpaying 19,169 cases in Japan.
AFLAC is named one of the World's Most Ethical Companies by Ethisphere magazine.
AFLAC has an earnings conference call, sales down in Japan, expect slow growth there for this year.