FUMBX — Fidelity Short-Term Treasury Bond Index Fund
Data updated: 2026-07-24
FUMBX — Fidelity Short-Term Treasury Bond Index Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Short Treasury / Sovereign Bond · $3.62B AUM · 0.03% expense ratio · 3.4% 1-yr return. From SEC regulatory filings.
FUMBX Fund Overview
FUMBX — Fidelity Short-Term Treasury Bond Index Fund is a US mutual fund managed by Fidelity Salem Street Trust, categorised as Short Treasury / Sovereign 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: Short Treasury / Sovereign Bond
- Assets under management: $3.62B
- 1-year return: 3.4%
- Ticker: FUMBX
- SEC CIK: 0000035315
- SEC series ID: S000017679
- Share class ID: C000194658
FUMBX Holdings
Top 10 holdings of Fidelity Short-Term Treasury Bond Index Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Ust Notes | 4.47% |
| Ust Notes | 2.96% |
| Ust Notes | 2.61% |
| Ust Notes | 2.55% |
| Ust Notes | 2.50% |
| Ust Notes | 2.36% |
| Ust Notes | 2.23% |
| Ust Notes | 1.89% |
| Ust Notes | 1.83% |
| Ust Notes | 1.80% |
FUMBX Portfolio Allocation
Asset-class allocation of Fidelity Short-Term Treasury Bond Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 98.5% |
| Cash & Equivalents | 1.0% |
FUMBX Performance
Total returns for FUMBX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.3% |
| 1 year | 3.4% |
| 3 years (annualised) | 4.0% |
| 5 years (annualised) | 1.4% |
FUMBX Risk Information
Risk metrics for FUMBX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 1.7%
FUMBX Costs and Fees
FUMBX costs about $3 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.03%
- Gross expense ratio: 0.03%
- Portfolio turnover: 35%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
FUMBX Cashflows
Over the 12 months to 2026-02, Fidelity Short-Term Treasury Bond Index Fund had net inflows of $533.52M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | $90.64M |
| 2026-01 | $55.87M |
| 2025-12 | $58.55M |
| 2025-11 | $50.20M |
| 2025-10 | $34.96M |
| 2025-09 | $19.98M |
FUMBX Debt Constituents
Largest debt holdings of Fidelity Short-Term Treasury Bond Index Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Ust Notes | 4.47% |
| Ust Notes | 2.96% |
| Ust Notes | 2.61% |
| Ust Notes | 2.55% |
| Ust Notes | 2.50% |
| Ust Notes | 2.36% |
| Ust Notes | 2.23% |
| Ust Notes | 1.89% |
| Ust Notes | 1.83% |
| Ust Notes | 1.80% |
FUMBX Prospectus and SEC Filings
Official Fidelity Short-Term Treasury Bond Index Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Short Treasury / Sovereign 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.