ACMVX vs. VMVIX

Last updated Jun 26, 2026

ACMVX (American Century Mid Cap Value Fund) and VMVIX (Vanguard Mid-Cap Value Index Fund) are both Mid Cap Value Equities funds. Over the past 10 years, ACMVX returned 9.42%/yr vs 10.81%/yr for VMVIX. With a 0.96 correlation, they move nearly in lockstep. ACMVX charges 0.97%/yr vs 0.19%/yr for VMVIX.

Performance

ACMVX vs. VMVIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Mid Cap Value Fund (ACMVX) and Vanguard Mid-Cap Value Index Fund (VMVIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ACMVX achieves a 10.66% return, which is significantly lower than VMVIX's 12.30% return. Over the past 10 years, ACMVX has underperformed VMVIX with an annualized return of 9.42%, while VMVIX has yielded a comparatively higher 10.81% annualized return.

ACMVX

• 1D: 1.00%
• 1M: 2.33%
• YTD: 10.66%
• 6M: 9.62%
• 1Y: 18.76%
• 3Y*: 11.53%
• 5Y*: 7.71%
• 10Y*: 9.42%

VMVIX

• 1D: 0.49%
• 1M: 1.60%
• YTD: 12.30%
• 6M: 11.03%
• 1Y: 24.05%
• 3Y*: 16.05%
• 5Y*: 8.97%
• 10Y*: 10.81%

*Multi-year figures are annualized to reflect compound growth (CAGR)

ACMVX vs. VMVIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ACMVX American Century Mid Cap Value Fund	10.66%	8.77%	8.50%	6.18%	-1.34%	23.41%	1.63%	28.89%	-12.63%	11.57%
VMVIX Vanguard Mid-Cap Value Index Fund	12.30%	11.22%	13.48%	10.00%	-8.00%	28.60%	2.33%	27.85%	-12.57%	16.91%

Correlation

The correlation between ACMVX and VMVIX is 0.94, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.96
Correlation (All Time) Calculated using the full available price history since Aug 24, 2006	0.96

The correlation between ACMVX and VMVIX has been stable across timeframes, ranging from 0.94 to 0.96 - a consistent structural relationship.

Return for Risk

ACMVX vs. VMVIX — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

ACMVX

ACMVX Risk / Return Rank: 38
ACMVX Sharpe Ratio Rank: 38
ACMVX Sortino Ratio Rank: 42
ACMVX Omega Ratio Rank: 35
ACMVX Calmar Ratio Rank: 40
ACMVX Martin Ratio Rank: 35

VMVIX

VMVIX Risk / Return Rank: 72
VMVIX Sharpe Ratio Rank: 67
VMVIX Sortino Ratio Rank: 69
VMVIX Omega Ratio Rank: 59
VMVIX Calmar Ratio Rank: 82
VMVIX Martin Ratio Rank: 80

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

ACMVX vs. VMVIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Mid Cap Value Fund (ACMVX) and Vanguard Mid-Cap Value Index Fund (VMVIX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	ACMVX	VMVIX	Difference
Sharpe ratio: Return per unit of total volatility	1.49	1.98	-0.49
Sortino ratio: Return per unit of downside risk	2.27	2.86	-0.59
Omega ratio: Gain probability vs. loss probability	1.26	1.35	-0.09
Calmar ratio: Return relative to maximum drawdown	2.10	3.30	-1.20
Martin ratio: Return relative to average drawdown	6.80	12.56	-5.75

ACMVX vs. VMVIX - Sharpe Ratio Comparison

The current ACMVX Sharpe Ratio is 1.49, which is comparable to the VMVIX Sharpe Ratio of 1.98. The chart below compares the historical Sharpe Ratios of ACMVX and VMVIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

ACMVX vs. VMVIX - Drawdown Comparison

The maximum ACMVX drawdown since its inception was -51.19%, smaller than the maximum VMVIX drawdown of -61.61%. Use the drawdown chart below to compare losses from any high point for ACMVX and VMVIX.

Drawdown Indicators

	ACMVX	VMVIX	Difference
Max Drawdown Largest peak-to-trough decline	-51.19%	-61.61%	+10.42%
Max Drawdown (1Y) Largest decline over 1 year	-8.49%	-6.96%	-1.53%
Max Drawdown (3Y) Largest decline over 3 years	-14.57%	-18.94%	+4.37%
Max Drawdown (5Y) Largest decline over 5 years	-17.46%	-19.81%	+2.35%
Max Drawdown (10Y) Largest decline over 10 years	-39.24%	-43.08%	+3.84%
Current Drawdown Current decline from peak	-0.06%	-0.54%	+0.48%
Average Drawdown Average peak-to-trough decline	-5.91%	-8.43%	+2.52%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.62%	1.83%	+0.79%

Volatility

ACMVX vs. VMVIX - Volatility Comparison

American Century Mid Cap Value Fund (ACMVX) and Vanguard Mid-Cap Value Index Fund (VMVIX) have volatilities of 3.28% and 3.30%, 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.

Volatility by Period

	ACMVX	VMVIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.28%	3.30%	-0.02%
Volatility (6M) Calculated over the trailing 6-month period	8.68%	8.41%	+0.27%
Volatility (1Y) Calculated over the trailing 1-year period	11.97%	11.60%	+0.37%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.62%	16.00%	-1.38%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.41%	18.75%	-1.34%

ACMVX vs. VMVIX - Expense Ratio Comparison

ACMVX has a 0.97% expense ratio, which is higher than VMVIX's 0.19% expense ratio.

Dividends

ACMVX vs. VMVIX - Dividend Comparison

ACMVX's dividend yield for the trailing twelve months is around 13.25%, more than VMVIX's 1.74% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACMVX American Century Mid Cap Value Fund	13.25%	14.46%	8.76%	5.24%	15.00%	15.95%	1.83%	1.46%	14.51%	9.49%	4.05%	11.06%
VMVIX Vanguard Mid-Cap Value Index Fund	1.74%	1.42%	1.99%	2.15%	2.15%	1.67%	2.26%	1.95%	2.60%	1.75%	1.81%	1.91%

Frequently Asked Questions

Can I hold both ACMVX and VMVIX in my portfolio?

With a correlation of 0.94, ACMVX and VMVIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, ACMVX or VMVIX?

VMVIX has higher volatility (3.30%) compared to ACMVX (3.28%). In terms of maximum drawdown, ACMVX dropped -51.19% vs VMVIX's -61.61%.

Which has better risk-adjusted returns?

VMVIX currently has the higher Sharpe Ratio (1.98 vs 1.49), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.