A large insurer has updated the identity of a financial services subsidiary.

Principal Financial Group Inc., Des Moines, Iowa, says the unit, Delaware Charter Guarantee & Trust Company, Wilmington, Del., now will operate as Principal Trust Company.

The unit has been operating under the trade name Trustar Retirement Services.

Principal Trust has been part of Principal since 1986. It manages individual retirement accounts and other savings accounts that benefit from federal tax breaks.