ACMVX vs. VMFVX

Last updated Jun 4, 2026

ACMVX (American Century Mid Cap Value Fund) and VMFVX (Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares) are both Mid Cap Value Equities funds. Over the past 10 years, ACMVX returned 8.93%/yr vs 10.55%/yr for VMFVX. Their correlation of 0.94 suggests significant overlap in exposure. ACMVX charges 0.97%/yr vs 0.08%/yr for VMFVX.

Performance

ACMVX vs. VMFVX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Mid Cap Value Fund (ACMVX) and Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares (VMFVX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ACMVX achieves a 8.22% return, which is significantly lower than VMFVX's 9.39% return. Over the past 10 years, ACMVX has underperformed VMFVX with an annualized return of 8.93%, while VMFVX has yielded a comparatively higher 10.55% annualized return.

ACMVX

• 1D: 0.95%
• 1M: 2.24%
• YTD: 8.22%
• 6M: 7.90%
• 1Y: 16.16%
• 3Y*: 11.02%
• 5Y*: 6.87%
• 10Y*: 8.93%

VMFVX

• 1D: 1.05%
• 1M: 2.15%
• YTD: 9.39%
• 6M: 9.65%
• 1Y: 21.23%
• 3Y*: 14.13%
• 5Y*: 7.70%
• 10Y*: 10.55%

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

ACMVX vs. VMFVX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ACMVX American Century Mid Cap Value Fund	8.22%	8.77%	8.50%	6.18%	-1.34%	23.41%	1.63%	28.89%	-12.63%	11.57%
VMFVX Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares	9.39%	7.57%	10.59%	16.49%	-7.03%	30.54%	3.68%	26.18%	-11.90%	12.27%

Correlation

The correlation between ACMVX and VMFVX is 0.90, 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	0.90
Correlation (3Y) Calculated over the trailing 3-year period	0.89
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jan 4, 2011	0.94

The correlation between ACMVX and VMFVX has been stable across timeframes, ranging from 0.89 to 0.94 - a consistent structural relationship.

Return for Risk

ACMVX vs. VMFVX — Risk / Return Rank

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

ACMVX

ACMVX Risk / Return Rank: 26
ACMVX Sharpe Ratio Rank: 25
ACMVX Sortino Ratio Rank: 27
ACMVX Omega Ratio Rank: 23
ACMVX Calmar Ratio Rank: 28
ACMVX Martin Ratio Rank: 26

VMFVX

VMFVX Risk / Return Rank: 30
VMFVX Sharpe Ratio Rank: 28
VMFVX Sortino Ratio Rank: 30
VMFVX Omega Ratio Rank: 26
VMFVX Calmar Ratio Rank: 34
VMFVX Martin Ratio Rank: 33

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. VMFVX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Mid Cap Value Fund (ACMVX) and Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares (VMFVX). 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.

	ACMVX	VMFVX	Difference
Sharpe ratio Return per unit of total volatility	1.42	1.51	-0.09
Sortino ratio Return per unit of downside risk	2.16	2.28	-0.11
Omega ratio Gain probability vs. loss probability	1.25	1.27	-0.02
Calmar ratio Return relative to maximum drawdown	1.99	2.18	-0.19
Martin ratio Return relative to average drawdown	6.42	7.51	-1.09
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ACMVX vs. VMFVX - Sharpe Ratio Comparison

The current ACMVX Sharpe Ratio is 1.42, which is comparable to the VMFVX Sharpe Ratio of 1.51. The chart below compares the historical Sharpe Ratios of ACMVX and VMFVX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	ACMVX	VMFVX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.42	1.51	-0.09
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.47	0.40	+0.07
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.51	0.48	+0.03
Sharpe Ratio (All Time) Calculated using the full available price history	0.55	0.52	+0.03

Drawdowns

ACMVX vs. VMFVX - Drawdown Comparison

The maximum ACMVX drawdown since its inception was -51.19%, which is greater than VMFVX's maximum drawdown of -45.79%. Use the drawdown chart below to compare losses from any high point for ACMVX and VMFVX.

Drawdown Indicators

	ACMVX	VMFVX	Difference
Max Drawdown Largest peak-to-trough decline	-51.19%	-45.79%	-5.40%
Max Drawdown (1Y) Largest decline over 1 year	-8.49%	-10.52%	+2.03%
Max Drawdown (3Y) Largest decline over 3 years	-14.57%	-22.46%	+7.89%
Max Drawdown (5Y) Largest decline over 5 years	-17.46%	-22.46%	+5.00%
Max Drawdown (10Y) Largest decline over 10 years	-39.24%	-45.79%	+6.55%
Current Drawdown Current decline from peak	-1.39%	0.00%	-1.39%
Average Drawdown Average peak-to-trough decline	-5.93%	-5.48%	-0.45%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.63%	3.05%	-0.42%

Volatility

ACMVX vs. VMFVX - Volatility Comparison

The current volatility for American Century Mid Cap Value Fund (ACMVX) is 3.01%, while Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares (VMFVX) has a volatility of 4.02%. This indicates that ACMVX experiences smaller price fluctuations and is considered to be less risky than VMFVX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ACMVX	VMFVX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.01%	4.02%	-1.01%
Volatility (6M) Calculated over the trailing 6-month period	8.50%	10.50%	-2.00%
Volatility (1Y) Calculated over the trailing 1-year period	11.88%	15.14%	-3.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.64%	19.47%	-4.83%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.45%	21.88%	-4.43%

ACMVX vs. VMFVX - Expense Ratio Comparison

ACMVX has a 0.97% expense ratio, which is higher than VMFVX's 0.08% expense ratio.

Dividends

ACMVX vs. VMFVX - Dividend Comparison

ACMVX's dividend yield for the trailing twelve months is around 13.30%, more than VMFVX's 1.72% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACMVX American Century Mid Cap Value Fund	13.30%	14.46%	8.76%	5.24%	15.00%	15.95%	1.83%	1.46%	14.51%	9.49%	4.05%	11.06%
VMFVX Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares	1.72%	1.88%	1.81%	1.58%	2.04%	1.81%	2.48%	1.94%	2.01%	1.56%	1.42%	1.73%

Frequently Asked Questions

Can I hold both ACMVX and VMFVX in my portfolio?

ACMVX and VMFVX have a correlation of 0.90, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ACMVX or VMFVX?

VMFVX has higher volatility (4.02%) compared to ACMVX (3.01%). In terms of maximum drawdown, ACMVX dropped -51.19% vs VMFVX's -45.79%.

Which has better risk-adjusted returns?

VMFVX currently has the higher Sharpe Ratio (1.51 vs 1.42), 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.