VMGAX Performance — Vanguard Mega Cap Growth Index Fund, Institutional Shares
Data updated: 2026-08-28
VMGAX returned +6.79% year to date and +20.60% over one year to Jun 2026. Annualised returns are +23.75% over 3 years and +14.30% over 5 years. The fund beat its US Large Growth category average: $100 invested three years ago grew to $189, against $175 for the category, and to $121 over one year, against $117. Volatility over the past three years was 17.72% a year. In the 12 months to Jun 2026 the fund took in a net $478.7M, and assets reached $33.30B.
VMGAX Growth of $100
What $100 invested in Vanguard Mega Cap Growth Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Large Growth category average over the same months.
| Period | VMGAX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $121 | $117 |
| 3 years (Jul 2023 – Jun 2026) | $189 | $175 |
| 5 years (Jul 2021 – Jun 2026) | $195 | $166 |
| Since data start (Sep 2019 – Jun 2026) | $347 | $271 |
VMGAX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +6.79% |
| 1 year | +20.60% |
| 3 years (annualised) | +23.75% |
| 5 years (annualised) | +14.30% |
VMGAX Annual Returns
Calendar-year total returns of Vanguard Mega Cap Growth Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +6.79% |
| 2025 | +20.72% |
| 2024 | +32.98% |
| 2023 | +51.58% |
| 2022 | −33.55% |
| 2021 | +28.51% |
| 2020 | +41.03% |
| 2019 (Sep–Dec) | +10.79% |
VMGAX 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 | −1.7% | −4.6% | −5.0% | +14.3% | +8.7% | −3.5% | — | — | — | — | — | — |
| 2025 | +1.5% | −2.8% | −8.7% | +2.4% | +9.2% | +6.2% | +3.9% | +0.9% | +4.9% | +4.5% | −1.5% | −0.3% |
| 2024 | +2.6% | +6.9% | +0.9% | −4.6% | +6.9% | +7.4% | −2.2% | +2.5% | +2.4% | −0.6% | +6.2% | +1.2% |
| 2023 | +10.7% | −1.4% | +9.0% | +1.8% | +6.0% | +6.8% | +3.2% | −0.7% | −5.8% | −1.1% | +11.6% | +3.7% |
| 2022 | −8.6% | −5.3% | +4.1% | −13.0% | −2.6% | −8.6% | +13.4% | −5.3% | −10.6% | +3.8% | +4.6% | −8.8% |
| 2021 | −1.0% | +0.3% | +2.3% | +7.4% | −1.5% | +6.0% | +3.6% | +3.8% | −5.4% | +8.2% | +0.9% | +1.8% |
| 2020 | +3.5% | −6.4% | −9.7% | +15.0% | +6.5% | +5.2% | +7.7% | +11.5% | −5.2% | −3.7% | +9.8% | +4.0% |
| 2019 | — | — | — | — | — | — | — | — | +0.3% | +2.7% | +4.1% | +3.4% |
VMGAX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 17.72%
- 3-year Sharpe ratio: 1.09 (vs 4.5% risk-free rate)
- Best month: +14.25% (Apr 2026)
- Worst month: −8.74% (Mar 2025)
VMGAX Fund Flows
Monthly money in and out of Vanguard Mega Cap Growth Index Fund, from SEC Form N-PORT.
- 12-month net flow: $478.7M
- 12-month gross sales (incl. reinvestments): $6.8B
- Sales ÷ redemptions: 1.08×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $626.0M | $874.1M | −$248.2M |
| May 2026 | $148.2M | $144.4M | $3.9M |
| Apr 2026 | $303.6M | $95.6M | $208.0M |
| Mar 2026 | $181.6M | $143.8M | $37.8M |
| Feb 2026 | $101.1M | $1.2B | −$1.1B |
| Jan 2026 | $528.7M | $658.5M | −$129.8M |
| Dec 2025 | $1.2B | $1.3B | −$62.7M |
| Nov 2025 | $229.6M | $41.1M | $188.5M |
| Oct 2025 | $318.6M | $42.3M | $276.3M |
| Sep 2025 | $2.0B | $1.7B | $308.6M |
| Aug 2025 | $676.1M | $76.6M | $599.5M |
| Jul 2025 | $416.9M | $67.3M | $349.5M |
VMGAX Assets Under Management
Net assets of Vanguard Mega Cap Growth Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $33.30B |
| 2026-03-31 | $27.85B |
| 2025-12-31 | $32.48B |
| 2025-09-30 | $31.28B |
| 2025-06-30 | $27.24B |
| 2025-03-31 | $22.60B |
| 2024-12-31 | $25.02B |
| 2024-09-30 | $22.97B |
| 2024-08-31 | $22.00B |
| 2024-05-31 | $19.57B |
| 2024-02-29 | $18.65B |
| 2023-11-30 | $15.81B |
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.