Unum Group Chief Executive Officer Thomas Watjen is shying away from adding junk bonds to the insurer's investment portfolio after yields plummeted.

“There are times like now maybe where high-yield gets too hot,” Watjen, whose company holds about $40 billion of fixed- maturity securities, said today in an interview at Bloomberg headquarters in New York. “You just can't get enough return in the sector to justify investing, given the risk parameters of that asset class.”

Yields on speculative-grade debt tumbled to a record low of 7.19 percent in May before rising to 7.45 percent as of July 22, according to Bank of America Merrill Lynch index data. That compares with an average borrowing cost of 12.6 percent on similarly rated companies two years earlier, the data show.

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