VO Performance — Vanguard Mid-Cap Index Fund
Data updated: 2026-08-28
VO returned +11.85% year to date and +16.75% over one year to Jun 2026. Annualised returns are +15.33% over 3 years and +7.95% over 5 years. Against its US Mid-Cap Blend category average the fund came out ahead over three years but behind over one: $100 invested three years ago grew to $153, against $150 for the category, and to $117 over one year, against $122. Volatility over the past three years was 14.34% a year. In the 12 months to Jun 2026 the fund took in a net $2.9B, and assets reached $224.06B.
VO Growth of $100
What $100 invested in Vanguard Mid-Cap Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Mid-Cap Blend category average over the same months.
| Period | VO | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $117 | $122 |
| 3 years (Jul 2023 – Jun 2026) | $153 | $150 |
| 5 years (Jul 2021 – Jun 2026) | $147 | $147 |
| Since data start (Jul 2019 – Jun 2026) | $215 | $208 |
VO Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +11.85% |
| 1 year | +16.75% |
| 3 years (annualised) | +15.33% |
| 5 years (annualised) | +7.95% |
VO Annual Returns
Calendar-year total returns of Vanguard Mid-Cap Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +11.85% |
| 2025 | +11.68% |
| 2024 | +15.23% |
| 2023 | +15.99% |
| 2022 | −18.68% |
| 2021 | +24.52% |
| 2020 | +18.22% |
| 2019 (Jul–Dec) | +7.53% |
VO 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 | +2.1% | +3.4% | −5.8% | +7.7% | +2.1% | +2.4% | — | — | — | — | — | — |
| 2025 | +4.4% | −1.9% | −4.0% | −0.9% | +5.5% | +4.0% | +2.0% | +1.5% | +1.6% | −1.0% | +0.5% | −0.3% |
| 2024 | −1.5% | +5.0% | +4.3% | −4.8% | +2.7% | −0.6% | +4.0% | +2.5% | +2.5% | −0.4% | +8.3% | −6.8% |
| 2023 | +8.0% | −2.7% | −1.1% | −0.7% | −2.6% | +8.4% | +3.5% | −3.6% | −4.9% | −4.7% | +10.0% | +7.1% |
| 2022 | −7.9% | −1.0% | +2.7% | −8.0% | −0.3% | −9.4% | +9.6% | −3.0% | −9.9% | +8.5% | +6.1% | −5.4% |
| 2021 | −0.5% | +5.3% | +2.4% | +4.8% | +0.8% | +1.8% | +1.3% | +3.0% | −4.2% | +6.6% | −2.5% | +3.9% |
| 2020 | −0.2% | −8.8% | −18.4% | +14.4% | +7.1% | +2.0% | +6.5% | +3.1% | −1.7% | −0.1% | +13.5% | +4.1% |
| 2019 | — | — | — | — | — | — | +1.3% | −2.7% | +2.1% | +1.1% | +3.2% | +2.4% |
VO Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 14.34%
- 3-year Sharpe ratio: 0.76 (vs 4.5% risk-free rate)
- Best month: +10.01% (Nov 2023)
- Worst month: −6.83% (Dec 2024)
VO Fund Flows
Monthly money in and out of Vanguard Mid-Cap Index Fund, from SEC Form N-PORT.
- 12-month net flow: $2.9B
- 12-month gross sales (incl. reinvestments): $45.2B
- Sales ÷ redemptions: 1.07×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $10.6B | $9.9B | $684.4M |
| May 2026 | $1.9B | $1.3B | $587.0M |
| Apr 2026 | $2.2B | $1.9B | $333.9M |
| Mar 2026 | $6.9B | $5.9B | $1.0B |
| Feb 2026 | $2.1B | $1.5B | $623.9M |
| Jan 2026 | $2.3B | $2.9B | −$661.4M |
| Dec 2025 | $5.4B | $4.2B | $1.2B |
| Nov 2025 | $1.5B | $1.5B | $66.9M |
| Oct 2025 | $1.8B | $2.7B | −$843.1M |
| Sep 2025 | $4.4B | $4.6B | −$225.1M |
| Aug 2025 | $2.0B | $2.7B | −$702.3M |
| Jul 2025 | $4.1B | $3.3B | $817.2M |
VO Assets Under Management
Net assets of Vanguard Mid-Cap Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $224.06B |
| 2026-03-31 | $198.27B |
| 2025-12-31 | $199.36B |
| 2025-09-30 | $201.43B |
| 2025-06-30 | $192.13B |
| 2025-03-31 | $175.32B |
| 2024-12-31 | $176.98B |
| 2024-09-30 | $175.65B |
| 2024-06-30 | $161.59B |
| 2024-03-31 | $166.81B |
| 2023-12-31 | $155.73B |
| 2023-09-30 | $139.18B |
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.