VMFVX vs. ACLAX

Last updated Jun 5, 2026

VMFVX (Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares) and ACLAX (American Century Mid Cap Value Fund A Class) are both Mid Cap Value Equities funds. Over the past 10 years, VMFVX returned 10.51%/yr vs 8.63%/yr for ACLAX. Their correlation of 0.94 suggests significant overlap in exposure. VMFVX charges 0.08%/yr vs 1.22%/yr for ACLAX.

Performance

VMFVX vs. ACLAX - Performance Comparison

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

Returns By Period

In the year-to-date period, VMFVX achieves a 9.01% return, which is significantly higher than ACLAX's 7.92% return. Over the past 10 years, VMFVX has outperformed ACLAX with an annualized return of 10.51%, while ACLAX has yielded a comparatively lower 8.63% annualized return.

VMFVX

• 1D: -0.35%
• 1M: 0.72%
• YTD: 9.01%
• 6M: 9.08%
• 1Y: 21.48%
• 3Y*: 14.00%
• 5Y*: 7.58%
• 10Y*: 10.51%

ACLAX

• 1D: -0.13%
• 1M: 1.08%
• YTD: 7.92%
• 6M: 7.60%
• 1Y: 16.23%
• 3Y*: 10.66%
• 5Y*: 6.50%
• 10Y*: 8.63%

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

VMFVX vs. ACLAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VMFVX Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares	9.01%	7.57%	10.59%	16.49%	-7.03%	30.54%	3.68%	26.18%	-11.90%	12.27%
ACLAX American Century Mid Cap Value Fund A Class	7.92%	8.52%	8.18%	5.93%	-1.53%	23.01%	1.44%	28.55%	-12.93%	11.31%

Correlation

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

Return for Risk

VMFVX vs. ACLAX — Risk / Return Rank

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

VMFVX

VMFVX Risk / Return Rank: 26
VMFVX Sharpe Ratio Rank: 23
VMFVX Sortino Ratio Rank: 25
VMFVX Omega Ratio Rank: 22
VMFVX Calmar Ratio Rank: 29
VMFVX Martin Ratio Rank: 30

ACLAX

ACLAX Risk / Return Rank: 23
ACLAX Sharpe Ratio Rank: 22
ACLAX Sortino Ratio Rank: 24
ACLAX Omega Ratio Rank: 20
ACLAX Calmar Ratio Rank: 26
ACLAX Martin Ratio Rank: 25

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.

VMFVX vs. ACLAX - Risk-Adjusted Trends Comparison

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

	VMFVX	ACLAX	Difference
Sharpe ratio: Return per unit of total volatility	1.39	1.33	+0.05
Sortino ratio: Return per unit of downside risk	2.10	2.04	+0.06
Omega ratio: Gain probability vs. loss probability	1.24	1.23	+0.01
Calmar ratio: Return relative to maximum drawdown	1.99	1.86	+0.13
Martin ratio: Return relative to average drawdown	6.85	5.94	+0.91
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VMFVX vs. ACLAX - Sharpe Ratio Comparison

The current VMFVX Sharpe Ratio is 1.39, which is comparable to the ACLAX Sharpe Ratio of 1.33. The chart below compares the historical Sharpe Ratios of VMFVX and ACLAX, 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

	VMFVX	ACLAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.39	1.33	+0.05
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.39	0.45	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.48	0.50	-0.01
Sharpe Ratio (All Time) Calculated using the full available price history	0.52	0.49	+0.03

Drawdowns

VMFVX vs. ACLAX - Drawdown Comparison

The maximum VMFVX drawdown since its inception was -45.79%, smaller than the maximum ACLAX drawdown of -51.37%. Use the drawdown chart below to compare losses from any high point for VMFVX and ACLAX.

Drawdown Indicators

	VMFVX	ACLAX	Difference
Max Drawdown Largest peak-to-trough decline	-45.79%	-51.37%	+5.58%
Max Drawdown (1Y) Largest decline over 1 year	-10.52%	-8.50%	-2.02%
Max Drawdown (3Y) Largest decline over 3 years	-22.46%	-14.67%	-7.79%
Max Drawdown (5Y) Largest decline over 5 years	-22.46%	-17.55%	-4.91%
Max Drawdown (10Y) Largest decline over 10 years	-45.79%	-39.24%	-6.55%
Current Drawdown Current decline from peak	-0.35%	-1.63%	+1.28%
Average Drawdown Average peak-to-trough decline	-5.48%	-6.26%	+0.78%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.05%	2.65%	+0.40%

Volatility

VMFVX vs. ACLAX - Volatility Comparison

Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares (VMFVX) has a higher volatility of 3.87% compared to American Century Mid Cap Value Fund A Class (ACLAX) at 2.90%. This indicates that VMFVX's price experiences larger fluctuations and is considered to be riskier than ACLAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMFVX	ACLAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.87%	2.90%	+0.97%
Volatility (6M) Calculated over the trailing 6-month period	10.50%	8.47%	+2.03%
Volatility (1Y) Calculated over the trailing 1-year period	15.13%	11.87%	+3.26%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.47%	14.65%	+4.82%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.88%	17.48%	+4.40%

VMFVX vs. ACLAX - Expense Ratio Comparison

VMFVX has a 0.08% expense ratio, which is lower than ACLAX's 1.22% expense ratio.

Dividends

VMFVX vs. ACLAX - Dividend Comparison

VMFVX's dividend yield for the trailing twelve months is around 1.73%, less than ACLAX's 13.13% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACLAX American Century Mid Cap Value Fund A Class	13.13%	14.24%	8.53%	5.01%	14.77%	15.72%	1.62%	1.23%	14.17%	9.25%	3.82%	10.86%
VMFVX Vanguard S&P Mid-Cap 400 Value Index Fund Institutional Shares	1.73%	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 VMFVX and ACLAX in my portfolio?

VMFVX and ACLAX 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, VMFVX or ACLAX?

VMFVX has higher volatility (3.87%) compared to ACLAX (2.90%). In terms of maximum drawdown, VMFVX dropped -45.79% vs ACLAX's -51.37%.

Which has better risk-adjusted returns?

VMFVX currently has the higher Sharpe Ratio (1.39 vs 1.33), 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.