FUMBX Performance — Fidelity Short-Term Treasury Bond Index Fund
Data updated: 2026-07-24
FUMBX returned +0.28% year to date and +3.39% over one year to May 2026. Annualised returns are +3.96% over 3 years and +1.38% over 5 years. The fund trailed its Short-Term Government Bond category average: $100 invested three years ago grew to $112, against $115 for the category, and to $103 over one year, against $104. Volatility over the past three years was 2.35% a year. In the 12 months to May 2026 the fund took in a net $468.7M, and assets reached $3.62B.
FUMBX Growth of $100
What $100 invested in Fidelity Short-Term Treasury Bond Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Short-Term Government Bond category average over the same months.
| Period | FUMBX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $103 | $104 |
| 3 years (Jun 2023 – May 2026) | $112 | $115 |
| 5 years (Jun 2021 – May 2026) | $107 | $111 |
| Since data start (Sep 2019 – May 2026) | $111 | $117 |
FUMBX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.28% |
| 1 year | +3.39% |
| 3 years (annualised) | +3.96% |
| 5 years (annualised) | +1.38% |
FUMBX Annual Returns
Calendar-year total returns of Fidelity Short-Term Treasury Bond Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +0.28% |
| 2025 | +5.82% |
| 2024 | +3.26% |
| 2023 | +4.46% |
| 2022 | −5.61% |
| 2021 | −1.23% |
| 2020 | +4.41% |
| 2019 (Sep–Dec) | +0.05% |
FUMBX 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% | +0.8% | −0.8% | +0.1% | 0.0% | — | — | — | — | — | — | — |
| 2025 | +0.5% | +1.0% | +0.6% | +1.0% | −0.4% | +0.8% | −0.1% | +1.0% | +0.2% | +0.3% | +0.6% | +0.2% |
| 2024 | +0.2% | −0.8% | +0.4% | −0.7% | +0.9% | +0.8% | +1.5% | +1.1% | +0.9% | −1.1% | +0.4% | −0.1% |
| 2023 | +1.2% | −1.3% | +2.1% | +0.4% | −0.5% | −0.8% | +0.2% | +0.2% | −0.4% | +0.1% | +1.5% | +1.6% |
| 2022 | −1.0% | −0.5% | −2.0% | −0.8% | +0.7% | −0.7% | +0.9% | −1.4% | −1.7% | −0.2% | +1.1% | −0.1% |
| 2021 | −0.1% | −0.3% | −0.2% | +0.2% | +0.1% | −0.2% | +0.4% | −0.1% | −0.3% | −0.5% | +0.1% | −0.2% |
| 2020 | +0.9% | +1.2% | +1.8% | 0.0% | +0.2% | 0.0% | +0.2% | −0.1% | 0.0% | −0.1% | +0.1% | +0.1% |
| 2019 | — | — | — | — | — | — | — | — | −0.2% | +0.2% | 0.0% | +0.1% |
FUMBX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 2.35%
- 3-year Sharpe ratio: -0.23 (vs 4.5% risk-free rate)
- Best month: +1.62% (Dec 2023)
- Worst month: −1.07% (Oct 2024)
FUMBX Fund Flows
Monthly money in and out of Fidelity Short-Term Treasury Bond Index Fund, from SEC Form N-PORT.
- 12-month net flow: $468.7M
- 12-month gross sales (incl. reinvestments): $1.4B
- Sales ÷ redemptions: 1.53×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $121.1M | $86.2M | $34.9M |
| Apr 2026 | $128.9M | $74.5M | $54.4M |
| Mar 2026 | $169.6M | $156.5M | $13.1M |
| Feb 2026 | $144.1M | $53.4M | $90.6M |
| Jan 2026 | $130.4M | $74.5M | $55.9M |
| Dec 2025 | $125.8M | $67.3M | $58.5M |
| Nov 2025 | $107.8M | $57.6M | $50.2M |
| Oct 2025 | $107.4M | $72.5M | $35.0M |
| Sep 2025 | $88.0M | $68.0M | $20.0M |
| Aug 2025 | $93.0M | $55.7M | $37.3M |
| Jul 2025 | $69.0M | $68.1M | $854K |
| Jun 2025 | $74.4M | $56.4M | $18.0M |
FUMBX Assets Under Management
Net assets of Fidelity Short-Term Treasury Bond Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $3.62B |
| 2026-02-28 | $3.57B |
| 2025-11-30 | $3.38B |
| 2025-08-31 | $3.26B |
| 2025-05-31 | $3.17B |
| 2025-02-28 | $2.99B |
| 2024-11-30 | $3.00B |
| 2024-08-31 | $3.38B |
| 2024-05-31 | $3.30B |
| 2024-02-29 | $3.47B |
| 2023-11-30 | $3.70B |
| 2023-08-31 | $4.07B |
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.