TSP C Fund

$123.0718 share price on October 23, 2026-0.31% since the September 30, 2026 close

Index tracked

S&P 500 Index

Asset managers

BlackRock Institutional Trust Company, N.A.; State Street Global Advisors Trust Company

Inception date

January 29, 1988

Risk (TSP rating)

Medium

Total expense ratio (as of December 31, 2025)

0.035%

Assets (as of December 31, 2025)

$474.3 billion

Prices are TSP’s published share prices (the first row is the latest trading day in our data; the others are month-end closes). For every fund and every date, see TSP share price history.

C Fund (Common Stock Index Investment Fund). The C Fund’s investment objective is to match the performance of the Standard and Poor’s 500 (S&P 500) Index, a broad market index made up of stocks of 500 large U.S. companies.

The C Fund invests in the stocks of 500 of the largest U.S. companies, in the same proportions as the S&P 500 Index.

Index tracked: S&P 500 Index. Managed by BlackRock Institutional Trust Company, N.A. and State Street Global Advisors Trust Company, who select and manage the fund’s assets on behalf of the FRTIB’s Executive Director; the fund is judged on how closely its returns match the index.

TSP rates the C Fund’s risk (potential for short-term loss) as Medium. Market risk: C Fund returns move up and down with the prices of the stocks in the S&P 500 Index. Inflation risk: returns may not outpace inflation.

The C Fund’s total expense ratio was 0.035% as of December 31, 2025: a net administrative expense ratio of 0.034% plus an investment expense ratio of 0.001%. That is $0.35 a year for every $1,000 invested. TSP publishes expense ratios once a year.

Through September 2026, TSP’s published average annual returns for the C Fund are 15.72% over 1 year, 22.85% over 3 years, 13.76% over 5 years, 15.30% over 10 years, 11.45% since its January 29, 1988 inception; the year-to-date return is 12.73%. Its best calendar year in TSP’s data is 1995 (37.41%) and its worst is 2008 (-36.99%).

On the 10-year average annual return, the C Fund shows 15.30% against the G Fund’s 2.97% (lower). Past returns do not predict future results.

C Fund composition by sector (as of December 31, 2025)

S&P 500 sector weights. Due to rounding, they may not add up to exactly 100%.

Top ten holdings (as of December 31, 2025, in TSP’s order)

Company names as listed by TSP, with obvious typos corrected, in the order TSP publishes them.

1. Nvidia Corp (NVDA)
2. Apple Inc (AAPL)
3. Microsoft Corp (MSFT)
4. Amazon.com, Inc (AMZN)
5. Alphabet Inc Class A (GOOGL)
6. Broadcom Inc (AVGO)
7. Alphabet Inc Class C (GOOG)
8. Meta Platforms Inc Class A (META)
9. Tesla Inc (TSLA)
10. Berkshire Hathaway Inc Class B (BRK.B)

Averages are TSP’s annualized returns ending September 2026, net of fund expenses; the September 2026 column is that month’s return. Since inception counts from January 29, 1988.

Best calendar year: 1995 (37.41%). Worst: 2008 (-36.99%).

Full history for every fund, with monthly returns, is on TSP rates of return.

Average annual returns through September 2026, as published by TSP. Funds that started on different dates cover different periods, and a blank means the fund has not existed that long.