FUBFX Performance — Fidelity U.S. Bond Index Fund, Class F
Data updated: 2026-07-24
FUBFX returned +0.50% year to date and +5.16% over one year to May 2026. Annualised returns are +3.93% over 3 years and +0.17% over 5 years. The fund trailed its Intermediate Core Bond category average: $100 invested three years ago grew to $112, against $115 for the category, and to $105 over one year, against $105. Volatility over the past three years was 5.54% a year. In the 12 months to May 2026 the fund took in a net $5.6B, and assets reached $69.05B. Returns are those of sibling share class FXNAX; this class's own returns are not reported in filings.
FUBFX Growth of $100
What $100 invested in Fidelity U.S. Bond Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Core Bond category average over the same months.
| Period | FUBFX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $105 | $105 |
| 3 years (Jun 2023 – May 2026) | $112 | $115 |
| 5 years (Jun 2021 – May 2026) | $101 | $103 |
| Since data start (Sep 2019 – May 2026) | $105 | $109 |
FUBFX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.50% |
| 1 year | +5.16% |
| 3 years (annualised) | +3.93% |
| 5 years (annualised) | +0.17% |
FUBFX Annual Returns
Calendar-year total returns of Fidelity U.S. Bond Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +0.50% |
| 2025 | +7.12% |
| 2024 | +1.34% |
| 2023 | +5.54% |
| 2022 | −13.05% |
| 2021 | −1.77% |
| 2020 | +7.79% |
| 2019 (Sep–Dec) | −0.55% |
FUBFX Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +0.2% | +1.6% | −1.8% | +0.1% | +0.3% | — | — | — | — | — | — | — |
| 2025 | +0.5% | +2.2% | 0.0% | +0.4% | −0.8% | +1.6% | −0.3% | +1.2% | +1.1% | +0.7% | +0.6% | −0.2% |
| 2024 | −0.1% | −1.5% | +0.9% | −2.5% | +1.6% | +1.1% | +2.2% | +1.4% | +1.4% | −2.5% | +1.1% | −1.6% |
| 2023 | +3.2% | −2.5% | +2.5% | +0.6% | −1.1% | −0.3% | 0.0% | −0.6% | −2.5% | −1.7% | +4.5% | +3.8% |
| 2022 | −2.1% | −1.1% | −2.8% | −3.8% | +0.6% | −1.6% | +2.5% | −2.8% | −4.2% | −1.4% | +3.8% | −0.7% |
| 2021 | −0.7% | −1.6% | −1.2% | +0.8% | +0.2% | +0.8% | +1.1% | −0.2% | −0.8% | 0.0% | +0.2% | −0.3% |
| 2020 | +2.1% | +1.8% | −0.2% | +1.7% | +0.4% | +0.7% | +1.4% | −0.9% | −0.1% | −0.5% | +1.1% | +0.1% |
| 2019 | — | — | — | — | — | — | — | — | −0.6% | +0.3% | 0.0% | −0.2% |
FUBFX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 5.54%
- 3-year Sharpe ratio: -0.10 (vs 4.5% risk-free rate)
- Best month: +4.51% (Nov 2023)
- Worst month: −2.54% (Oct 2024)
FUBFX Fund Flows
Monthly money in and out of Fidelity U.S. Bond Index Fund, from SEC Form N-PORT.
- 12-month net flow: $5.6B
- 12-month gross sales (incl. reinvestments): $28.8B
- Sales ÷ redemptions: 1.24×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $2.8B | $1.7B | $1.1B |
| Apr 2026 | $2.1B | $3.0B | −$878.7M |
| Mar 2026 | $2.1B | $2.1B | $67.3M |
| Feb 2026 | $2.6B | $1.9B | $650.6M |
| Jan 2026 | $2.9B | $2.3B | $649.8M |
| Dec 2025 | $2.4B | $1.8B | $582.9M |
| Nov 2025 | $2.4B | $2.1B | $290.0M |
| Oct 2025 | $2.9B | $2.6B | $260.4M |
| Sep 2025 | $2.2B | $1.6B | $615.5M |
| Aug 2025 | $2.0B | $1.4B | $624.3M |
| Jul 2025 | $2.1B | $1.7B | $446.1M |
| Jun 2025 | $2.4B | $1.2B | $1.2B |
FUBFX Assets Under Management
Net assets of Fidelity U.S. Bond Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $69.05B |
| 2026-02-28 | $70.38B |
| 2025-11-30 | $68.03B |
| 2025-08-31 | $65.92B |
| 2025-05-31 | $62.64B |
| 2025-02-28 | $62.16B |
| 2024-11-30 | $61.02B |
| 2024-08-31 | $58.54B |
| 2024-05-31 | $56.54B |
| 2024-02-29 | $57.62B |
| 2023-11-30 | $55.96B |
| 2023-08-31 | $59.91B |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.