FIFZX — Fidelity Series Bond Index Fund
Data updated: 2026-07-24
FIFZX — Fidelity Series Bond Index Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Total / Aggregate Bond · $34.05B AUM · 0.00% expense ratio · 5.2% 1-yr return. From SEC regulatory filings.
FIFZX Fund Overview
FIFZX — Fidelity Series Bond Index Fund is a US mutual fund managed by Fidelity Salem Street Trust, categorised as Long Total / Aggregate Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Fidelity Salem Street Trust
- Category: Long Total / Aggregate Bond
- Assets under management: $34.05B
- 1-year return: 5.2%
- Ticker: FIFZX
- SEC CIK: 0000035315
- SEC series ID: S000065215
- Share class ID: C000211071
FIFZX Holdings
Top 10 holdings of Fidelity Series Bond Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Ust Notes | 1.16% |
| Ust Notes | 1.12% |
| Ust Notes | 1.11% |
| Ust Notes | 1.09% |
| Ust Notes | 1.05% |
| United States Treasury Bond | 0.88% |
| Ust Notes | 0.80% |
| Ust Notes | 0.73% |
| United States Treasury Bond | 0.73% |
| United States Treasury Bond | 0.68% |
FIFZX Portfolio Allocation
Asset-class allocation of Fidelity Series Bond Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 75.3% |
| Securitized | 25.0% |
| Cash & Equivalents | 0.8% |
FIFZX Performance
Total returns for FIFZX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.6% |
| 1 year | 5.2% |
| 3 years (annualised) | 4.0% |
| 5 years (annualised) | 0.2% |
FIFZX Risk Information
Risk metrics for FIFZX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.2%
FIFZX Costs and Fees
FIFZX costs about $0 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.00%
- Gross expense ratio: 0.00%
- Portfolio turnover: 55%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
FIFZX Cashflows
Over the 12 months to 2026-02, Fidelity Series Bond Index Fund had net inflows of $4.80B, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | $805.59M |
| 2026-01 | $460.16M |
| 2025-12 | $69.25M |
| 2025-11 | $458.25M |
| 2025-10 | $411.63M |
| 2025-09 | $493.66M |
FIFZX Debt Constituents
Largest debt holdings of Fidelity Series Bond Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Ust Notes | 1.16% |
| Ust Notes | 1.12% |
| Ust Notes | 1.11% |
| Ust Notes | 1.09% |
| Ust Notes | 1.05% |
| United States Treasury Bond | 0.88% |
| Ust Notes | 0.80% |
| Ust Notes | 0.73% |
| United States Treasury Bond | 0.73% |
| United States Treasury Bond | 0.68% |
FIFZX Prospectus and SEC Filings
Official Fidelity Series Bond Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Long Total / Aggregate Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.