Returns represent earnings after deduction of accrued administrative expenses, and, in the cases of the F, C, S, I, and L Funds, after trading costs and accrued investment management fees. Future performance of the funds may be significantly different. See the TSP Fund Sheets on the TSP Web site (http://www.tsp.gov) for additional information. The Government Securities Investment (G) Fund is invested in special issues of U.S. Treasury securities. The Fixed Income Index Investment (F) Fund is invested in the Barclays U.S. Debt Index Fund, which tracks the Lehman Brothers U.S. Aggregate bond index. The Common Stock Index Investment (C) Fund is invested in the Barclays Equity Index Fund, which tracks the S&P 500 stock index. The Small Capitalization Stock Index Investment (S) Fund is invested in the Barclays Extended Market Index Fund, which tracks the Dow Jones Wilshire 4500 Completion stock index. The International Stock Index Investment (I) Fund is invested in the Barclays EAFE Index Fund, which tracks the EAFE (Europe, Australasia, Far East) stock index. The L Funds are invested in the individual TSP funds (G, F, C, S, and I). The L Funds were implemented on August 1, 2005.

Source:  Federal Retirement Thrift Investment Board OC 06-4 (2/2008)