FNBGX Performance — Fidelity Long-Term Treasury Bond Index Fund
Data updated: 2026-07-24
FNBGX returned −0.18% year to date and +4.36% over one year to May 2026. Annualised returns are −0.84% over 3 years and −5.09% over 5 years. The fund trailed its Long-Term Government Bond category average: $100 invested three years ago grew to $97, against $104 for the category, and to $104 over one year, against $106. Volatility over the past three years was 12.71% a year. In the 12 months to May 2026 the fund took in a net $128.6M, and assets reached $4.92B.
FNBGX Growth of $100
What $100 invested in Fidelity Long-Term Treasury Bond Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Long-Term Government Bond category average over the same months.
| Period | FNBGX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $104 | $106 |
| 3 years (Jun 2023 – May 2026) | $97 | $104 |
| 5 years (Jun 2021 – May 2026) | $77 | $86 |
| Since data start (Sep 2019 – May 2026) | $75 | $89 |
FNBGX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | −0.18% |
| 1 year | +4.36% |
| 3 years (annualised) | −0.84% |
| 5 years (annualised) | −5.09% |
FNBGX Annual Returns
Calendar-year total returns of Fidelity Long-Term Treasury Bond Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | −0.18% |
| 2025 | +5.27% |
| 2024 | −6.18% |
| 2023 | +3.19% |
| 2022 | −29.42% |
| 2021 | −4.86% |
| 2020 | +17.81% |
| 2019 (Sep–Dec) | −7.01% |
FNBGX 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 | −0.1% | +4.2% | −3.9% | −0.8% | +0.6% | — | — | — | — | — | — | — |
| 2025 | +0.5% | +5.2% | −0.9% | −1.2% | −2.8% | +2.4% | −0.9% | +0.3% | +3.0% | +1.3% | +0.4% | −2.1% |
| 2024 | −1.8% | −2.4% | +1.1% | −6.0% | +2.9% | +1.6% | +3.6% | +2.0% | +2.0% | −5.1% | +1.8% | −5.5% |
| 2023 | +7.1% | −4.8% | +4.7% | +0.5% | −2.8% | 0.0% | −2.1% | −2.8% | −7.3% | −5.0% | +9.1% | +8.2% |
| 2022 | −3.7% | −1.5% | −5.3% | −8.9% | −2.0% | −1.4% | +2.6% | −4.5% | −7.8% | −5.6% | +7.1% | −2.3% |
| 2021 | −3.4% | −5.6% | −5.0% | +2.4% | 0.0% | +4.0% | +3.6% | −0.3% | −2.9% | +1.9% | +2.7% | −1.8% |
| 2020 | +7.5% | +6.6% | +6.7% | +1.0% | −1.8% | +0.3% | +4.2% | −4.8% | +0.8% | −3.3% | +1.5% | −1.3% |
| 2019 | — | — | — | — | — | — | — | — | −2.5% | −1.1% | −0.4% | −3.1% |
FNBGX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 12.71%
- 3-year Sharpe ratio: -0.42 (vs 4.5% risk-free rate)
- Best month: +9.12% (Nov 2023)
- Worst month: −7.33% (Sep 2023)
FNBGX Fund Flows
Monthly money in and out of Fidelity Long-Term Treasury Bond Index Fund, from SEC Form N-PORT.
- 12-month net flow: $128.6M
- 12-month gross sales (incl. reinvestments): $2.1B
- Sales ÷ redemptions: 1.07×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $238.6M | $166.7M | $72.0M |
| Apr 2026 | $129.3M | $186.1M | −$56.8M |
| Mar 2026 | $119.0M | $196.6M | −$77.7M |
| Feb 2026 | $190.8M | $190.3M | $449K |
| Jan 2026 | $216.3M | $106.3M | $110.0M |
| Dec 2025 | $241.3M | $111.9M | $129.3M |
| Nov 2025 | $97.9M | $123.1M | −$25.2M |
| Oct 2025 | $108.3M | $199.6M | −$91.3M |
| Sep 2025 | $112.4M | $242.0M | −$129.6M |
| Aug 2025 | $216.8M | $142.7M | $74.1M |
| Jul 2025 | $218.9M | $119.2M | $99.7M |
| Jun 2025 | $202.5M | $178.9M | $23.6M |
FNBGX Assets Under Management
Net assets of Fidelity Long-Term Treasury Bond Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $4.92B |
| 2026-02-28 | $5.25B |
| 2025-11-30 | $4.96B |
| 2025-08-31 | $5.01B |
| 2025-05-31 | $4.77B |
| 2025-02-28 | $4.80B |
| 2024-11-30 | $4.71B |
| 2024-08-31 | $4.54B |
| 2024-05-31 | $4.06B |
| 2024-02-29 | $4.00B |
| 2023-11-30 | $3.84B |
| 2023-08-31 | $3.67B |
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.