VTBSX Performance — Vanguard Total Bond Market Index Fund, Institutional Select Shares
Data updated: 2026-08-28
VTBSX returned +0.77% year to date and +3.74% over one year to Jun 2026. Annualised returns are +4.20% over 3 years and +0.11% over 5 years. The fund trailed its Intermediate Core Bond category average: $100 invested three years ago grew to $113, against $115 for the category, and to $104 over one year, against $104. Volatility over the past three years was 5.46% a year. In the 12 months to Jun 2026 the fund took in a net $39.2B, and assets reached $397.11B.
VTBSX Growth of $100
What $100 invested in Vanguard Total Bond Market Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Core Bond category average over the same months.
| Period | VTBSX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $104 | $104 |
| 3 years (Jul 2023 – Jun 2026) | $113 | $115 |
| 5 years (Jul 2021 – Jun 2026) | $101 | $102 |
| Since data start (Jul 2019 – Jun 2026) | $109 | $112 |
VTBSX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.77% |
| 1 year | +3.74% |
| 3 years (annualised) | +4.20% |
| 5 years (annualised) | +0.11% |
VTBSX Annual Returns
Calendar-year total returns of Vanguard Total Bond Market Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +0.77% |
| 2025 | +7.18% |
| 2024 | +1.28% |
| 2023 | +5.74% |
| 2022 | −13.13% |
| 2021 | −1.63% |
| 2020 | +7.76% |
| 2019 (Jul–Dec) | +2.48% |
VTBSX 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% | +1.5% | −1.7% | +0.1% | +0.3% | +0.2% | — | — | — | — | — | — |
| 2025 | +0.6% | +2.1% | 0.0% | +0.4% | −0.7% | +1.6% | −0.3% | +1.2% | +1.0% | +0.6% | +0.6% | −0.3% |
| 2024 | −0.2% | −1.4% | +0.8% | −2.4% | +1.7% | +0.9% | +2.3% | +1.3% | +1.3% | −2.4% | +1.1% | −1.7% |
| 2023 | +3.2% | −2.5% | +2.6% | +0.6% | −1.1% | −0.4% | 0.0% | −0.6% | −2.5% | −1.6% | +4.5% | +3.7% |
| 2022 | −2.2% | −1.1% | −2.8% | −3.8% | +0.6% | −1.5% | +2.3% | −2.8% | −4.2% | −1.4% | +3.7% | −0.6% |
| 2021 | −0.8% | −1.5% | −1.4% | +1.0% | +0.2% | +0.8% | +1.2% | −0.2% | −0.9% | 0.0% | +0.3% | −0.4% |
| 2020 | +2.1% | +1.7% | −0.6% | +1.7% | +0.5% | +0.7% | +1.6% | −1.0% | +0.1% | −0.6% | +1.1% | +0.2% |
| 2019 | — | — | — | — | — | — | +0.2% | +2.8% | −0.6% | +0.2% | −0.1% | −0.1% |
VTBSX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 5.46%
- 3-year Sharpe ratio: -0.06 (vs 4.5% risk-free rate)
- Best month: +4.52% (Nov 2023)
- Worst month: −2.48% (Sep 2023)
VTBSX Fund Flows
Monthly money in and out of Vanguard Total Bond Market Index Fund, from SEC Form N-PORT.
- 12-month net flow: $39.2B
- 12-month gross sales (incl. reinvestments): $104.1B
- Sales ÷ redemptions: 1.61×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $7.2B | $3.5B | $3.7B |
| May 2026 | $9.1B | $4.0B | $5.1B |
| Apr 2026 | $6.3B | $3.5B | $2.8B |
| Mar 2026 | $9.5B | $10.8B | −$1.2B |
| Feb 2026 | $7.8B | $4.9B | $2.9B |
| Jan 2026 | $9.5B | $5.3B | $4.2B |
| Dec 2025 | $9.2B | $5.1B | $4.1B |
| Nov 2025 | $8.9B | $6.3B | $2.5B |
| Oct 2025 | $11.5B | $7.0B | $4.4B |
| Sep 2025 | $8.8B | $4.0B | $4.8B |
| Aug 2025 | $7.3B | $4.8B | $2.5B |
| Jul 2025 | $8.9B | $5.5B | $3.4B |
VTBSX Assets Under Management
Net assets of Vanguard Total Bond Market Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $397.11B |
| 2026-03-31 | $386.76B |
| 2025-12-31 | $384.09B |
| 2025-09-30 | $373.57B |
| 2025-06-30 | $359.18B |
| 2025-03-31 | $354.74B |
| 2024-12-31 | $341.55B |
| 2024-09-30 | $342.64B |
| 2024-06-30 | $319.65B |
| 2024-03-31 | $317.98B |
| 2023-12-31 | $314.27B |
| 2023-09-30 | $291.34B |
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.