The G Fund assets are managed internally by the Federal Retirement Thrift Investment Board. The G Fund buys a nonmarketable U.S. Treasury security that is guaranteed by the U.S. Government. This means that the G Fund will not lose money.
The Federal Retirement Thrift Investment Board currently contracts BlackRock Institutional Trust Company, N.A. (BlackRock) to manage the F, C, S, and I Fund assets. The F and C Fund assets are held in separate accounts.
The F, C, S, and I Funds are index funds, each of which is invested in order to replicate the risk and return characteristics of its appropriate benchmark index. For example, the C Fund is invested in a stock index fund that fully replicates the Standard and Poor's 500 (S&P 500) Index, a broad market index made up of the stocks of 500 large to medium-sized U.S. companies. The C Fund's objective is to match the performance of the S&P 500. The F, C, S, and I Funds remain invested regardless of the performance of the securities markets or the overall economy.
The L Funds are invested in the five individual TSP funds based on professionally determined asset allocations.