VLGIX Performance — Vanguard Long-Term Treasury Index Fund, Institutional Shares
Data updated: 2026-07-29
VLGIX returned −0.36% year to date and +4.41% over one year to May 2026. Annualised returns are −0.80% over 3 years and −5.09% over 5 years. The fund trailed its Long-Term Government Bond category average: $100 invested three years ago grew to $98, against $104 for the category, and to $104 over one year, against $106. Volatility over the past three years was 12.80% a year. In the 12 months to May 2026 the fund took in a net $602.5M, and assets reached $14.60B.
VLGIX Growth of $100
What $100 invested in Vanguard Long-Term Treasury Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Long-Term Government Bond category average over the same months.
| Period | VLGIX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $104 | $106 |
| 3 years (Jun 2023 – May 2026) | $98 | $104 |
| 5 years (Jun 2021 – May 2026) | $77 | $86 |
| Since data start (Sep 2019 – May 2026) | $75 | $89 |
VLGIX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | −0.36% |
| 1 year | +4.41% |
| 3 years (annualised) | −0.80% |
| 5 years (annualised) | −5.09% |
VLGIX Annual Returns
Calendar-year total returns of Vanguard Long-Term Treasury Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | −0.36% |
| 2025 | +5.42% |
| 2024 | −6.46% |
| 2023 | +3.70% |
| 2022 | −29.47% |
| 2021 | −5.04% |
| 2020 | +17.72% |
| 2019 (Sep–Dec) | −6.88% |
VLGIX 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 | −0.3% | +4.2% | −3.9% | −0.7% | +0.5% | — | — | — | — | — | — | — |
| 2025 | +0.4% | +5.2% | −0.9% | −1.2% | −2.8% | +2.5% | −0.9% | +0.3% | +3.1% | +1.3% | +0.4% | −1.9% |
| 2024 | −2.2% | −2.2% | +1.0% | −5.9% | +2.9% | +1.6% | +3.6% | +2.0% | +2.0% | −5.2% | +1.8% | −5.4% |
| 2023 | +7.1% | −4.8% | +4.8% | +0.5% | −2.8% | 0.0% | −2.1% | −2.8% | −7.3% | −5.0% | +9.2% | +8.6% |
| 2022 | −3.7% | −1.5% | −5.3% | −8.9% | −1.9% | −1.4% | +2.7% | −4.4% | −7.9% | −5.5% | +7.0% | −2.3% |
| 2021 | −3.5% | −5.6% | −4.9% | +2.3% | +0.1% | +4.0% | +3.6% | −0.2% | −2.9% | +1.8% | +2.7% | −1.9% |
| 2020 | +7.4% | +6.6% | +5.6% | +1.7% | −1.7% | +0.4% | +4.2% | −4.8% | +0.8% | −3.3% | +1.6% | −1.1% |
| 2019 | — | — | — | — | — | — | — | — | −2.6% | −1.1% | −0.4% | −3.0% |
VLGIX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 12.80%
- 3-year Sharpe ratio: -0.41 (vs 4.5% risk-free rate)
- Best month: +9.15% (Nov 2023)
- Worst month: −7.30% (Sep 2023)
VLGIX Fund Flows
Monthly money in and out of Vanguard Long-Term Treasury Index Fund, from SEC Form N-PORT.
- 12-month net flow: $602.5M
- 12-month gross sales (incl. reinvestments): $4.2B
- Sales ÷ redemptions: 1.17×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $457.4M | $130.8M | $326.6M |
| Apr 2026 | $208.4M | $237.1M | −$28.7M |
| Mar 2026 | $538.8M | $1.2B | −$669.8M |
| Feb 2026 | $997.4M | $182.9M | $814.5M |
| Jan 2026 | $256.5M | $296.5M | −$40.0M |
| Dec 2025 | $414.0M | $86.2M | $327.7M |
| Nov 2025 | $288.9M | $57.7M | $231.2M |
| Oct 2025 | $205.2M | $308.9M | −$103.8M |
| Sep 2025 | $273.6M | $434.7M | −$161.1M |
| Aug 2025 | $228.2M | $415.6M | −$187.4M |
| Jul 2025 | $228.6M | $139.0M | $89.7M |
| Jun 2025 | $140.2M | $136.6M | $3.6M |
VLGIX Assets Under Management
Net assets of Vanguard Long-Term Treasury Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $14.60B |
| 2026-02-28 | $15.80B |
| 2025-11-30 | $14.55B |
| 2025-08-31 | $14.06B |
| 2025-05-31 | $14.05B |
| 2025-02-28 | $14.62B |
| 2024-11-30 | $16.01B |
| 2024-08-31 | $19.08B |
| 2024-05-31 | $16.99B |
| 2024-02-29 | $16.40B |
| 2023-11-30 | $12.89B |
| 2023-08-31 | $11.42B |
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.