MassMutual Life Insurance Co. is considering widening its Japanese investment portfolio's remit to include synthetic collateralized debt obligations for the first time. Ki Tei, portfolio manager in Tokyo, said, "It may be a good opportunity since spreads are so tight in Japan." Tei, who oversees a fixed income portfolio primarily comprised of corporate and Japanese government bonds, said she is considering CDOs on U.S. and European underlying which offer greater yields than domestic products. Tei declined further comment. MassMutual has over USD325 billion in assets under management globally.