FUMBX — Fidelity Short-Term Treasury Bond Index Fund

Data updated: 2026-07-24

FUMBX — Fidelity Short-Term Treasury Bond Index Fund. Short Treasury / Sovereign Bond · $3.62B AUM. Holdings, fees, performance and SEC 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 Notes4.47%
Ust Notes2.96%
Ust Notes2.61%
Ust Notes2.55%
Ust Notes2.50%
Ust Notes2.36%
Ust Notes2.23%
Ust Notes1.89%
Ust Notes1.83%
Ust Notes1.80%

View all FUMBX holdings

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 classAllocation
Fixed Income98.5%
Cash & Equivalents1.0%

FUMBX Performance

Total returns for FUMBX (as of 2026-09-01), from SEC filings.

PeriodTotal return
YTD0.3%
1 year3.4%
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 2026-05, Fidelity Short-Term Treasury Bond Index Fund had net inflows of $468.71M, from monthly SEC N-PORT filings.

MonthNet flow
2026-05$34.89M
2026-04$54.36M
2026-03$13.13M
2026-02$90.64M
2026-01$55.87M
2025-12$58.55M

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 Notes4.47%
Ust Notes2.96%
Ust Notes2.61%
Ust Notes2.55%
Ust Notes2.50%
Ust Notes2.36%
Ust Notes2.23%
Ust Notes1.89%
Ust Notes1.83%
Ust Notes1.80%

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.