VMGAX vs. ACIHX
Compare and contrast key facts about Vanguard Mega Cap Growth Index Fund Institutional Shares (VMGAX) and American Century Growth Fund G Class (ACIHX).
VMGAX is managed by Vanguard. It was launched on Apr 3, 2008. ACIHX is an actively managed fund by American Century. It was launched on Mar 1, 2022.
Performance
VMGAX vs. ACIHX - Performance Comparison
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VMGAX vs. ACIHX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | |
|---|---|---|---|---|---|
VMGAX Vanguard Mega Cap Growth Index Fund Institutional Shares | -10.88% | 20.73% | 32.98% | 51.57% | -9.79% |
ACIHX American Century Growth Fund G Class | -10.03% | 16.26% | 27.35% | 44.64% | -6.24% |
Returns By Period
In the year-to-date period, VMGAX achieves a -10.88% return, which is significantly lower than ACIHX's -10.03% return.
VMGAX
- 1D
- 4.01%
- 1M
- -5.22%
- YTD
- -10.88%
- 6M
- -8.98%
- 1Y
- 18.45%
- 3Y*
- 22.15%
- 5Y*
- 12.39%
- 10Y*
- 16.86%
ACIHX
- 1D
- 3.77%
- 1M
- -5.57%
- YTD
- -10.03%
- 6M
- -9.48%
- 1Y
- 16.46%
- 3Y*
- 18.66%
- 5Y*
- —
- 10Y*
- —
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VMGAX vs. ACIHX - Expense Ratio Comparison
VMGAX has a 0.06% expense ratio, which is higher than ACIHX's 0.01% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Return for Risk
VMGAX vs. ACIHX — Risk / Return Rank
VMGAX
ACIHX
VMGAX vs. ACIHX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Vanguard Mega Cap Growth Index Fund Institutional Shares (VMGAX) and American Century Growth Fund G Class (ACIHX). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.
| VMGAX | ACIHX | Difference | |
|---|---|---|---|
Sharpe ratioReturn per unit of total volatility | 0.84 | 0.78 | +0.06 |
Sortino ratioReturn per unit of downside risk | 1.37 | 1.28 | +0.09 |
Omega ratioGain probability vs. loss probability | 1.19 | 1.18 | +0.01 |
Calmar ratioReturn relative to maximum drawdown | 1.17 | 1.07 | +0.10 |
Martin ratioReturn relative to average drawdown | 4.12 | 3.68 | +0.44 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| VMGAX | ACIHX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 0.84 | 0.78 | +0.06 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.55 | — | — |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.77 | — | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.59 | 0.78 | -0.19 |
Correlation
The correlation between VMGAX and ACIHX is 0.99, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.
Dividends
VMGAX vs. ACIHX - Dividend Comparison
VMGAX's dividend yield for the trailing twelve months is around 0.40%, less than ACIHX's 17.73% yield.
| TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
VMGAX Vanguard Mega Cap Growth Index Fund Institutional Shares | 0.40% | 0.36% | 0.44% | 0.51% | 0.71% | 0.42% | 0.65% | 0.86% | 1.13% | 1.23% | 1.53% | 1.44% |
ACIHX American Century Growth Fund G Class | 17.73% | 15.95% | 5.65% | 4.61% | 2.86% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Drawdowns
VMGAX vs. ACIHX - Drawdown Comparison
The maximum VMGAX drawdown since its inception was -47.97%, which is greater than ACIHX's maximum drawdown of -24.00%. Use the drawdown chart below to compare losses from any high point for VMGAX and ACIHX.
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Drawdown Indicators
| VMGAX | ACIHX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -47.97% | -24.00% | -23.97% |
Max Drawdown (1Y)Largest decline over 1 year | -16.78% | -16.40% | -0.38% |
Max Drawdown (5Y)Largest decline over 5 years | -36.03% | — | — |
Max Drawdown (10Y)Largest decline over 10 years | -36.03% | — | — |
Current DrawdownCurrent decline from peak | -13.45% | -13.25% | -0.20% |
Average DrawdownAverage peak-to-trough decline | -7.49% | -4.95% | -2.54% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 4.76% | 4.75% | +0.01% |
Volatility
VMGAX vs. ACIHX - Volatility Comparison
Vanguard Mega Cap Growth Index Fund Institutional Shares (VMGAX) and American Century Growth Fund G Class (ACIHX) have volatilities of 7.10% and 6.80%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| VMGAX | ACIHX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 7.10% | 6.80% | +0.30% |
Volatility (6M)Calculated over the trailing 6-month period | 12.93% | 12.60% | +0.33% |
Volatility (1Y)Calculated over the trailing 1-year period | 23.47% | 22.68% | +0.79% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 22.72% | 21.28% | +1.44% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 21.83% | 21.28% | +0.55% |