VSBIX Performance — Vanguard Short-Term Treasury Index Fund, Institutional Shares
Data updated: 2026-07-29
VSBIX returned +0.62% year to date and +3.50% over one year to May 2026. Annualised returns are +4.16% over 3 years and +1.83% over 5 years. The fund trailed its Short-Term Government Bond category average: $100 invested three years ago grew to $113, against $115 for the category, and to $103 over one year, against $104. Volatility over the past three years was 1.60% a year. In the 12 months to May 2026 the fund took in a net $7.0B, and assets reached $33.86B.
VSBIX Growth of $100
What $100 invested in Vanguard Short-Term Treasury 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 | VSBIX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $103 | $104 |
| 3 years (Jun 2023 – May 2026) | $113 | $115 |
| 5 years (Jun 2021 – May 2026) | $109 | $111 |
| Since data start (Sep 2019 – May 2026) | $113 | $117 |
VSBIX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.62% |
| 1 year | +3.50% |
| 3 years (annualised) | +4.16% |
| 5 years (annualised) | +1.83% |
VSBIX Annual Returns
Calendar-year total returns of Vanguard Short-Term Treasury Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +0.62% |
| 2025 | +5.11% |
| 2024 | +4.01% |
| 2023 | +4.28% |
| 2022 | −3.87% |
| 2021 | −0.67% |
| 2020 | +3.15% |
| 2019 (Sep–Dec) | +0.32% |
VSBIX 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% | +0.6% | −0.5% | +0.2% | +0.1% | — | — | — | — | — | — | — |
| 2025 | +0.4% | +0.7% | +0.5% | +0.8% | −0.2% | +0.6% | −0.1% | +0.9% | +0.3% | +0.3% | +0.5% | +0.3% |
| 2024 | +0.4% | −0.4% | +0.3% | −0.4% | +0.7% | +0.6% | +1.2% | +0.9% | +0.8% | −0.6% | +0.3% | +0.2% |
| 2023 | +0.8% | −0.8% | +1.6% | +0.2% | −0.4% | −0.5% | +0.3% | +0.4% | 0.0% | +0.3% | +1.0% | +1.2% |
| 2022 | −0.7% | −0.4% | −1.4% | −0.5% | +0.6% | −0.6% | +0.4% | −0.8% | −1.2% | −0.1% | +0.6% | +0.2% |
| 2021 | 0.0% | −0.1% | 0.0% | +0.1% | +0.1% | −0.2% | +0.2% | 0.0% | −0.1% | −0.3% | −0.1% | −0.2% |
| 2020 | +0.6% | +0.9% | +1.3% | +0.2% | +0.1% | 0.0% | +0.1% | 0.0% | 0.0% | −0.1% | 0.0% | +0.1% |
| 2019 | — | — | — | — | — | — | — | — | −0.1% | +0.3% | −0.1% | +0.2% |
VSBIX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 1.60%
- 3-year Sharpe ratio: -0.21 (vs 4.5% risk-free rate)
- Best month: +1.19% (Jul 2024)
- Worst month: −0.61% (Oct 2024)
VSBIX Fund Flows
Monthly money in and out of Vanguard Short-Term Treasury Index Fund, from SEC Form N-PORT.
- 12-month net flow: $7.0B
- 12-month gross sales (incl. reinvestments): $11.4B
- Sales ÷ redemptions: 2.63×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $897.9M | $445.6M | $452.3M |
| Apr 2026 | $683.5M | $531.9M | $151.5M |
| Mar 2026 | $1.7B | $751.8M | $957.6M |
| Feb 2026 | $1.1B | $226.6M | $894.4M |
| Jan 2026 | $1.5B | $275.0M | $1.2B |
| Dec 2025 | $662.3M | $157.8M | $504.5M |
| Nov 2025 | $877.3M | $224.0M | $653.3M |
| Oct 2025 | $2.0B | $257.8M | $1.7B |
| Sep 2025 | $611.4M | $436.2M | $175.2M |
| Aug 2025 | $426.3M | $441.1M | −$14.8M |
| Jul 2025 | $428.1M | $368.2M | $59.9M |
| Jun 2025 | $442.9M | $198.0M | $244.9M |
VSBIX Assets Under Management
Net assets of Vanguard Short-Term Treasury Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $33.86B |
| 2026-02-28 | $32.65B |
| 2025-11-30 | $29.95B |
| 2025-08-31 | $27.41B |
| 2025-05-31 | $27.01B |
| 2025-02-28 | $26.17B |
| 2024-11-30 | $23.69B |
| 2024-08-31 | $24.88B |
| 2024-05-31 | $24.04B |
| 2024-02-29 | $24.63B |
| 2023-11-30 | $26.48B |
| 2023-08-31 | $26.94B |
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.