VSIGX Performance — Vanguard Intermediate-Term Treasury Index Fund, Admiral Shares
Data updated: 2026-07-29
VSIGX returned −0.20% year to date and +3.51% over one year to May 2026. Annualised returns are +3.35% over 3 years and +0.11% over 5 years. The fund trailed its Intermediate Government Bond category average: $100 invested three years ago grew to $110, against $112 for the category, and to $104 over one year, against $105. Volatility over the past three years was 4.60% a year. In the 12 months to May 2026 the fund took in a net $10.4B, and assets reached $49.32B.
VSIGX Growth of $100
What $100 invested in Vanguard Intermediate-Term Treasury Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Government Bond category average over the same months.
| Period | VSIGX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $104 | $105 |
| 3 years (Jun 2023 – May 2026) | $110 | $112 |
| 5 years (Jun 2021 – May 2026) | $101 | $104 |
| Since data start (Sep 2019 – May 2026) | $105 | $111 |
VSIGX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | −0.20% |
| 1 year | +3.51% |
| 3 years (annualised) | +3.35% |
| 5 years (annualised) | +0.11% |
VSIGX Annual Returns
Calendar-year total returns of Vanguard Intermediate-Term Treasury Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | −0.20% |
| 2025 | +7.41% |
| 2024 | +1.29% |
| 2023 | +4.39% |
| 2022 | −10.69% |
| 2021 | −2.60% |
| 2020 | +7.65% |
| 2019 (Sep–Dec) | −1.15% |
VSIGX 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 | −0.1% | +1.7% | −1.7% | 0.0% | −0.1% | — | — | — | — | — | — | — |
| 2025 | +0.6% | +2.0% | +0.5% | +1.2% | −0.8% | +1.2% | −0.4% | +1.5% | +0.3% | +0.5% | +0.8% | −0.2% |
| 2024 | +0.2% | −1.5% | +0.6% | −2.0% | +1.4% | +1.1% | +2.3% | +1.2% | +1.1% | −2.4% | +0.7% | −1.1% |
| 2023 | +2.4% | −2.4% | +3.1% | +0.7% | −1.1% | −1.2% | −0.1% | −0.2% | −1.7% | −0.9% | +3.1% | +2.7% |
| 2022 | −1.6% | −0.5% | −3.3% | −2.4% | +0.7% | −0.8% | +2.0% | −2.9% | −3.3% | −0.7% | +2.5% | −0.8% |
| 2021 | −0.4% | −1.4% | −1.1% | +0.6% | +0.4% | 0.0% | +1.2% | −0.3% | −1.0% | −0.7% | +0.4% | −0.4% |
| 2020 | +2.2% | +2.1% | +2.7% | +0.3% | +0.3% | +0.1% | +0.5% | −0.3% | +0.1% | −0.7% | +0.2% | 0.0% |
| 2019 | — | — | — | — | — | — | — | — | −0.7% | +0.3% | −0.4% | −0.3% |
VSIGX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 4.60%
- 3-year Sharpe ratio: -0.25 (vs 4.5% risk-free rate)
- Best month: +3.06% (Nov 2023)
- Worst month: −2.40% (Oct 2024)
VSIGX Fund Flows
Monthly money in and out of Vanguard Intermediate-Term Treasury Index Fund, from SEC Form N-PORT.
- 12-month net flow: $10.4B
- 12-month gross sales (incl. reinvestments): $15.5B
- Sales ÷ redemptions: 3.01×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $1.1B | $135.0M | $934.7M |
| Apr 2026 | $1.1B | $810.1M | $287.6M |
| Mar 2026 | $1.3B | $820.0M | $525.9M |
| Feb 2026 | $1.3B | $233.7M | $1.0B |
| Jan 2026 | $3.4B | $708.2M | $2.7B |
| Dec 2025 | $1.2B | $248.8M | $974.9M |
| Nov 2025 | $1.2B | $175.8M | $1.0B |
| Oct 2025 | $1.4B | $348.6M | $1.1B |
| Sep 2025 | $1.5B | $508.9M | $1.0B |
| Aug 2025 | $758.5M | $427.7M | $330.7M |
| Jul 2025 | $685.4M | $237.0M | $448.4M |
| Jun 2025 | $517.3M | $503.3M | $14.0M |
VSIGX Assets Under Management
Net assets of Vanguard Intermediate-Term Treasury Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $49.32B |
| 2026-02-28 | $48.90B |
| 2025-11-30 | $43.96B |
| 2025-08-31 | $40.63B |
| 2025-05-31 | $39.32B |
| 2025-02-28 | $39.56B |
| 2024-11-30 | $38.82B |
| 2024-08-31 | $37.28B |
| 2024-05-31 | $34.05B |
| 2024-02-29 | $31.34B |
| 2023-11-30 | $26.99B |
| 2023-08-31 | $22.30B |
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.