what index tracks tsp funds
1 The TSP S Fund (Small Capitalization Stock Index Fund) is invested in the stocks of small and medium-sized U.S. companies. It tracks the Dow Jones U.S. Completion Total Stock Market Index.  The TSP I Fund (International Stock Index Investment Fund) is invested in international stocks from 21 developed countries.
1 The TSP C Fund (Common Stock Index Investment Fund) is invested in large capitalization U.S. stocks. It tracks the Standard & Poor's 500 (S&P 500) Stock Index.  The TSP S Fund (Small Capitalization Stock Index Fund) is invested in the stocks of small and medium-sized U.S. companies.