FIFZX Performance — Fidelity Series Bond Index Fund
Data updated: 2026-07-24
FIFZX returned +0.57% year to date and +5.21% over one year to May 2026. Annualised returns are +3.98% over 3 years and +0.21% 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 5.53% a year. In the 12 months to May 2026 the fund took in a net $6.7B, and assets reached $34.05B.
FIFZX Growth of $100
What $100 invested in Fidelity Series 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 | FIFZX | 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 |
FIFZX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.57% |
| 1 year | +5.21% |
| 3 years (annualised) | +3.98% |
| 5 years (annualised) | +0.21% |
FIFZX Annual Returns
Calendar-year total returns of Fidelity Series Bond Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +0.57% |
| 2025 | +7.12% |
| 2024 | +1.42% |
| 2023 | +5.53% |
| 2022 | −12.98% |
| 2021 | −1.82% |
| 2020 | +7.63% |
| 2019 (Sep–Dec) | −0.55% |
FIFZX 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% | −1.7% | +0.1% | +0.4% | — | — | — | — | — | — | — |
| 2025 | +0.5% | +2.2% | 0.0% | +0.3% | −0.7% | +1.6% | −0.2% | +1.1% | +1.1% | +0.7% | +0.7% | −0.3% |
| 2024 | 0.0% | −1.5% | +0.9% | −2.5% | +1.7% | +1.0% | +2.3% | +1.4% | +1.4% | −2.5% | +1.1% | −1.7% |
| 2023 | +3.2% | −2.5% | +2.5% | +0.6% | −1.1% | −0.3% | −0.1% | −0.6% | −2.6% | −1.6% | +4.5% | +3.7% |
| 2022 | −2.0% | −1.1% | −2.7% | −3.7% | +0.6% | −1.5% | +2.5% | −2.9% | −4.3% | −1.3% | +3.7% | −0.7% |
| 2021 | −0.7% | −1.6% | −1.3% | +0.9% | +0.1% | +0.8% | +1.2% | −0.2% | −0.9% | −0.1% | +0.3% | −0.4% |
| 2020 | +2.1% | +1.7% | −0.3% | +1.7% | +0.5% | +0.6% | +1.5% | −0.9% | 0.0% | −0.5% | +1.1% | +0.1% |
| 2019 | — | — | — | — | — | — | — | — | −0.5% | +0.2% | −0.1% | −0.2% |
FIFZX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 5.53%
- 3-year Sharpe ratio: -0.09 (vs 4.5% risk-free rate)
- Best month: +4.45% (Nov 2023)
- Worst month: −2.56% (Sep 2023)
FIFZX Fund Flows
Monthly money in and out of Fidelity Series Bond Index Fund, from SEC Form N-PORT.
- 12-month net flow: $6.7B
- 12-month gross sales (incl. reinvestments): $11.3B
- Sales ÷ redemptions: 2.48×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $2.2B | $181.2M | $2.0B |
| Apr 2026 | $354.1M | $1.3B | −$953.0M |
| Mar 2026 | $734.9M | $320.9M | $414.0M |
| Feb 2026 | $1.0B | $228.9M | $805.6M |
| Jan 2026 | $785.2M | $325.1M | $460.2M |
| Dec 2025 | $785.7M | $716.5M | $69.3M |
| Nov 2025 | $676.7M | $218.5M | $458.2M |
| Oct 2025 | $830.2M | $418.6M | $411.6M |
| Sep 2025 | $622.9M | $129.3M | $493.7M |
| Aug 2025 | $777.6M | $360.6M | $416.9M |
| Jul 2025 | $870.0M | $195.8M | $674.3M |
| Jun 2025 | $1.6B | $128.1M | $1.5B |
FIFZX Assets Under Management
Net assets of Fidelity Series Bond Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $34.05B |
| 2026-02-28 | $33.36B |
| 2025-11-30 | $31.82B |
| 2025-08-31 | $30.04B |
| 2025-05-31 | $27.04B |
| 2025-02-28 | $27.85B |
| 2024-11-30 | $26.49B |
| 2024-08-31 | $25.75B |
| 2024-05-31 | $24.11B |
| 2024-02-29 | $22.89B |
| 2023-11-30 | $21.32B |
| 2023-08-31 | $21.47B |
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.