TSP F Fund

$20.6918 share price on October 23, 2026+1.89% since the September 30, 2026 close

Index tracked

Bloomberg U.S. Aggregate Bond Index

Asset managers

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

Inception date

January 29, 1988

Risk (TSP rating)

Low-medium

Total expense ratio (as of December 31, 2025)

0.035%

Assets (as of December 31, 2025)

$39.3 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.

F Fund (Fixed Income Index Investment Fund). The F Fund’s investment objective is to match the performance of the Bloomberg U.S. Aggregate Bond Index, a broad index representing the U.S. bond market.

The F Fund must be invested in fixed-income securities by law. It holds a large representative sample of the asset-backed, U.S. government, corporate and foreign government securities in the Bloomberg U.S. Aggregate Bond Index, which holds high-quality (investment-grade) bonds with maturities of more than one year. On December 31, 2025 the index included 13,630 notes and bonds; it is not feasible for the fund to hold every one.

Index tracked: Bloomberg U.S. Aggregate Bond 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 F Fund’s risk (potential for short-term loss) as Low-medium. Market risk: F Fund returns move up and down with the bond market. Credit default risk: principal and interest payments on the bonds in the index may not be paid. Inflation risk: returns may not outpace inflation. Prepayment risk: if interest rates fall, bonds in the index may be paid back early, forcing lenders to reinvest at lower rates.

The F 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 F Fund are -1.77% over 1 year, 4.07% over 3 years, -0.57% over 5 years, 1.23% over 10 years, 5.12% since its January 29, 1988 inception; the year-to-date return is -2.75%. Its best calendar year in TSP’s data is 1995 (18.31%) and its worst is 2022 (-12.83%).

On the 10-year average annual return, the F Fund shows 1.23% against the C Fund’s 15.30% (higher) and the G Fund’s 2.97% (higher). Past returns do not predict future results.

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

Index sector weights. Due to rounding, they may not add up to exactly 100%.

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 (18.31%). Worst: 2022 (-12.83%).

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.