Federal Thrift Savings Plan, Washington, rehired BlackRock to manage its $25.4 billion fixed-income index fund, the F Fund.
BlackRock has managed the account since December 2009, Federal Thrift spokeswoman Kim Weaver said in an interview.
An RFP was issued June 1.
The F Fund, an aggregate corporate and government bond fund, represents 8% of TSP's $324.1 billion in assets.
The year-to-date return for the fund as of Nov. 30 was 4.43%; the 12 month-return as of the same date was 5.49%.