VMGIX Performance — Vanguard Mid-Cap Growth Index Fund, Investor Shares
Data updated: 2026-08-28
VMGIX returned +10.10% year to date and +8.36% over one year to Jun 2026. Annualised returns are +14.86% over 3 years and +5.94% over 5 years. The fund trailed its US Mid-Cap Growth category average: $100 invested three years ago grew to $152, against $152 for the category, and to $108 over one year, against $118. Volatility over the past three years was 17.34% a year. In the 12 months to Jun 2026 the fund took in a net $899.9M, and assets reached $34.82B.
VMGIX Growth of $100
What $100 invested in Vanguard Mid-Cap Growth Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Mid-Cap Growth category average over the same months.
| Period | VMGIX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $108 | $118 |
| 3 years (Jul 2023 – Jun 2026) | $152 | $152 |
| 5 years (Jul 2021 – Jun 2026) | $133 | $129 |
| Since data start (Jul 2019 – Jun 2026) | $213 | $203 |
VMGIX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +10.10% |
| 1 year | +8.36% |
| 3 years (annualised) | +14.86% |
| 5 years (annualised) | +5.94% |
VMGIX Annual Returns
Calendar-year total returns of Vanguard Mid-Cap Growth Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +10.10% |
| 2025 | +10.55% |
| 2024 | +16.27% |
| 2023 | +22.99% |
| 2022 | −28.93% |
| 2021 | +20.32% |
| 2020 | +34.32% |
| 2019 (Jul–Dec) | +6.74% |
VMGIX 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 | −0.9% | +0.7% | −7.4% | +10.5% | +4.9% | +2.7% | — | — | — | — | — | — |
| 2025 | +6.6% | −4.1% | −5.6% | +1.7% | +7.9% | +6.0% | +2.4% | −0.7% | +1.7% | −0.6% | −2.9% | −1.4% |
| 2024 | −1.5% | +6.1% | +2.9% | −5.1% | +2.2% | +0.5% | +1.7% | +1.9% | +2.5% | +0.3% | +10.8% | −6.0% |
| 2023 | +8.9% | −1.8% | +1.6% | −2.3% | +0.1% | +8.0% | +3.3% | −3.3% | −5.2% | −5.9% | +11.5% | +7.8% |
| 2022 | −12.8% | −1.3% | +1.9% | −11.4% | −3.2% | −8.1% | +11.8% | −3.4% | −9.9% | +6.7% | +5.7% | −6.3% |
| 2021 | −0.9% | +3.3% | −1.1% | +5.0% | −0.6% | +5.6% | +2.0% | +2.9% | −4.6% | +8.7% | −2.8% | +1.9% |
| 2020 | +1.2% | −7.0% | −15.1% | +15.9% | +9.7% | +2.8% | +7.4% | +3.2% | −1.5% | −0.7% | +13.5% | +4.7% |
| 2019 | — | — | — | — | — | — | +1.7% | −2.1% | −0.2% | +1.8% | +3.4% | +2.1% |
VMGIX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 17.34%
- 3-year Sharpe ratio: 0.60 (vs 4.5% risk-free rate)
- Best month: +11.48% (Nov 2023)
- Worst month: −7.44% (Mar 2026)
VMGIX Fund Flows
Monthly money in and out of Vanguard Mid-Cap Growth Index Fund, from SEC Form N-PORT.
- 12-month net flow: $899.9M
- 12-month gross sales (incl. reinvestments): $7.6B
- Sales ÷ redemptions: 1.14×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $2.2B | $2.1B | $148.9M |
| May 2026 | $280.1M | $311.6M | −$31.6M |
| Apr 2026 | $292.3M | $405.2M | −$112.9M |
| Mar 2026 | $334.4M | $398.7M | −$64.3M |
| Feb 2026 | $228.0M | $400.5M | −$172.5M |
| Jan 2026 | $362.3M | $339.9M | $22.4M |
| Dec 2025 | $504.8M | $238.0M | $266.7M |
| Nov 2025 | $281.0M | $263.7M | $17.3M |
| Oct 2025 | $430.7M | $217.1M | $213.6M |
| Sep 2025 | $1.4B | $1.1B | $290.2M |
| Aug 2025 | $349.3M | $283.9M | $65.5M |
| Jul 2025 | $824.4M | $568.0M | $256.4M |
VMGIX Assets Under Management
Net assets of Vanguard Mid-Cap Growth Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $34.82B |
| 2026-03-31 | $29.25B |
| 2025-12-31 | $31.94B |
| 2025-09-30 | $33.08B |
| 2025-06-30 | $31.43B |
| 2025-03-31 | $27.17B |
| 2024-12-31 | $27.71B |
| 2024-09-30 | $26.36B |
| 2024-06-30 | $24.88B |
| 2024-03-31 | $25.17B |
| 2023-12-31 | $23.04B |
| 2023-09-30 | $20.31B |
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.