ACMVX vs. OTCAX

Last updated Jun 23, 2026

ACMVX (American Century Mid Cap Value Fund) and OTCAX (MFS Mid Cap Growth Fund) are both mutual funds - ACMVX is a Mid Cap Value Equities fund managed by American Century, while OTCAX is a Mid Cap Growth Equities fund managed by MFS. Over the past 10 years, ACMVX returned 8.99%/yr vs 12.38%/yr for OTCAX. A 0.78 correlation means they provide meaningful diversification when combined. ACMVX charges 0.97%/yr vs 1.00%/yr for OTCAX.

Performance

ACMVX vs. OTCAX - Performance Comparison

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

Returns By Period

In the year-to-date period, ACMVX achieves a 8.82% return, which is significantly higher than OTCAX's 5.50% return. Over the past 10 years, ACMVX has underperformed OTCAX with an annualized return of 8.99%, while OTCAX has yielded a comparatively higher 12.38% annualized return.

ACMVX

• 1D: 0.06%
• 1M: 0.88%
• YTD: 8.82%
• 6M: 7.87%
• 1Y: 17.56%
• 3Y*: 9.99%
• 5Y*: 7.96%
• 10Y*: 8.99%

OTCAX

• 1D: 1.37%
• 1M: 3.78%
• YTD: 5.50%
• 6M: 3.50%
• 1Y: 4.18%
• 3Y*: 13.68%
• 5Y*: 5.33%
• 10Y*: 12.38%

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

ACMVX vs. OTCAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ACMVX American Century Mid Cap Value Fund	8.82%	8.77%	8.50%	6.18%	-1.34%	23.41%	1.63%	28.89%	-12.63%	11.57%
OTCAX MFS Mid Cap Growth Fund	5.50%	3.32%	23.47%	21.00%	-28.53%	13.66%	35.34%	37.43%	0.82%	25.95%

Correlation

The correlation between ACMVX and OTCAX is 0.52, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.52
Correlation (3Y) Calculated over the trailing 3-year period	0.58
Correlation (5Y) Calculated over the trailing 5-year period	0.66
Correlation (10Y) Calculated over the trailing 10-year period	0.66
Correlation (All Time) Calculated using the full available price history since Apr 1, 2004	0.78

Over the past year, the correlation between ACMVX and OTCAX has dropped to 0.52 - well below their long-term average of 0.78, suggesting their price drivers have been diverging.

Return for Risk

ACMVX vs. OTCAX — Risk / Return Rank

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

ACMVX

ACMVX Risk / Return Rank: 32
ACMVX Sharpe Ratio Rank: 31
ACMVX Sortino Ratio Rank: 34
ACMVX Omega Ratio Rank: 28
ACMVX Calmar Ratio Rank: 34
ACMVX Martin Ratio Rank: 31

OTCAX

OTCAX Risk / Return Rank: 4
OTCAX Sharpe Ratio Rank: 4
OTCAX Sortino Ratio Rank: 4
OTCAX Omega Ratio Rank: 4
OTCAX Calmar Ratio Rank: 4
OTCAX Martin Ratio Rank: 4

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. OTCAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Mid Cap Value Fund (ACMVX) and MFS Mid Cap Growth Fund (OTCAX). 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	OTCAX	Difference
Sharpe ratio: Return per unit of total volatility	1.48	0.25	+1.23
Sortino ratio: Return per unit of downside risk	2.25	0.47	+1.78
Omega ratio: Gain probability vs. loss probability	1.26	1.05	+0.21
Calmar ratio: Return relative to maximum drawdown	2.09	0.26	+1.83
Martin ratio: Return relative to average drawdown	6.75	0.66	+6.09

ACMVX vs. OTCAX - Sharpe Ratio Comparison

The current ACMVX Sharpe Ratio is 1.48, which is higher than the OTCAX Sharpe Ratio of 0.25. The chart below compares the historical Sharpe Ratios of ACMVX and OTCAX, 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. OTCAX - Drawdown Comparison

The maximum ACMVX drawdown since its inception was -51.19%, smaller than the maximum OTCAX drawdown of -74.39%. Use the drawdown chart below to compare losses from any high point for ACMVX and OTCAX.

Drawdown Indicators

	ACMVX	OTCAX	Difference
Max Drawdown Largest peak-to-trough decline	-51.19%	-74.39%	+23.20%
Max Drawdown (1Y) Largest decline over 1 year	-8.49%	-16.46%	+7.97%
Max Drawdown (3Y) Largest decline over 3 years	-14.57%	-21.05%	+6.48%
Max Drawdown (5Y) Largest decline over 5 years	-17.46%	-36.85%	+19.39%
Max Drawdown (10Y) Largest decline over 10 years	-39.24%	-36.85%	-2.39%
Current Drawdown Current decline from peak	-1.72%	-2.44%	+0.72%
Average Drawdown Average peak-to-trough decline	-5.91%	-23.10%	+17.19%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.62%	6.47%	-3.85%

Volatility

ACMVX vs. OTCAX - Volatility Comparison

The current volatility for American Century Mid Cap Value Fund (ACMVX) is 3.31%, while MFS Mid Cap Growth Fund (OTCAX) has a volatility of 6.17%. This indicates that ACMVX experiences smaller price fluctuations and is considered to be less risky than OTCAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ACMVX	OTCAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.31%	6.17%	-2.86%
Volatility (6M) Calculated over the trailing 6-month period	8.63%	14.23%	-5.60%
Volatility (1Y) Calculated over the trailing 1-year period	11.96%	17.29%	-5.33%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.64%	20.30%	-5.66%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.45%	20.03%	-2.58%

ACMVX vs. OTCAX - Expense Ratio Comparison

ACMVX has a 0.97% expense ratio, which is lower than OTCAX's 1.00% expense ratio.

Dividends

ACMVX vs. OTCAX - Dividend Comparison

ACMVX's dividend yield for the trailing twelve months is around 14.00%, less than OTCAX's 15.88% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACMVX American Century Mid Cap Value Fund	14.00%	14.46%	8.76%	5.24%	15.00%	15.95%	1.83%	1.46%	14.51%	9.49%	4.05%	11.06%
OTCAX MFS Mid Cap Growth Fund	15.88%	16.76%	15.59%	0.00%	0.00%	3.64%	0.83%	0.86%	4.70%	8.80%	5.67%	2.84%

Frequently Asked Questions

Can I hold both ACMVX and OTCAX in my portfolio?

ACMVX and OTCAX have a correlation of 0.52, 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 OTCAX?

OTCAX has higher volatility (6.17%) compared to ACMVX (3.31%). In terms of maximum drawdown, ACMVX dropped -51.19% vs OTCAX's -74.39%.

Which has better risk-adjusted returns?

ACMVX currently has the higher Sharpe Ratio (1.48 vs 0.25), 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.