TSP F Fund Fixed Income Index Investment Fund - Thrift Savings Plan Fund Objective. The F Fund s investment objective is to match the performance of the Barclays Capital U.S. Aggregate Bond Index, a broad
TSP Funds - Thrift Savings Plan - Click here for realtime quotes of C, S, I and F fund tracking indices. The G Fund - The G Fund invests in short-term U.S. treasuries. Principal is guaranteed.