Japan’s FSA report: Japan has 10 life insurance companies with over 10 trillion in assets (as of march 31,2013)
Nippon, Dai-ichi, Meiji Yasuda, Sumitomo, Taiyo, Daido do, Fukoku, Mitsui, Asahi, Sony, Gibraltar, AXA, Aflac, MetLife Alico
(there are more names I was unable to copy and paste)
for detailed financial report on each of them see the report published by Japans FSA: