OTCAX vs. ACMVX

Last updated Jun 5, 2026

OTCAX (MFS Mid Cap Growth Fund) and ACMVX (American Century Mid Cap Value Fund) are both mutual funds - OTCAX is a Mid Cap Growth Equities fund managed by MFS, while ACMVX is a Mid Cap Value Equities fund managed by American Century. Over the past 10 years, OTCAX returned 12.18%/yr vs 8.91%/yr for ACMVX. A 0.78 correlation means they provide meaningful diversification when combined. OTCAX charges 1.00%/yr vs 0.97%/yr for ACMVX.

Performance

OTCAX vs. ACMVX - Performance Comparison

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

Returns By Period

In the year-to-date period, OTCAX achieves a 4.28% return, which is significantly lower than ACMVX's 8.08% return. Over the past 10 years, OTCAX has outperformed ACMVX with an annualized return of 12.18%, while ACMVX has yielded a comparatively lower 8.91% annualized return.

OTCAX

• 1D: -0.57%
• 1M: 2.37%
• YTD: 4.28%
• 6M: 1.97%
• 1Y: 2.69%
• 3Y*: 14.09%
• 5Y*: 5.39%
• 10Y*: 12.18%

ACMVX

• 1D: -0.13%
• 1M: 1.14%
• YTD: 8.08%
• 6M: 7.71%
• 1Y: 16.53%
• 3Y*: 10.97%
• 5Y*: 6.77%
• 10Y*: 8.91%

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

OTCAX vs. ACMVX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OTCAX MFS Mid Cap Growth Fund	4.28%	3.32%	23.47%	21.00%	-28.53%	13.66%	35.34%	37.43%	0.82%	25.95%
ACMVX American Century Mid Cap Value Fund	8.08%	8.77%	8.50%	6.18%	-1.34%	23.41%	1.63%	28.89%	-12.63%	11.57%

Correlation

The correlation between OTCAX and ACMVX is 0.51, 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	0.51
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 2, 2004	0.78

Over the past year, the correlation between OTCAX and ACMVX has dropped to 0.51 - well below their long-term average of 0.78, suggesting their price drivers have been diverging.

Return for Risk

OTCAX vs. ACMVX — Risk / Return Rank

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

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

ACMVX

ACMVX Risk / Return Rank: 24
ACMVX Sharpe Ratio Rank: 22
ACMVX Sortino Ratio Rank: 25
ACMVX Omega Ratio Rank: 21
ACMVX Calmar Ratio Rank: 26
ACMVX 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.

OTCAX vs. ACMVX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MFS Mid Cap Growth Fund (OTCAX) and American Century Mid Cap Value Fund (ACMVX). 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.

	OTCAX	ACMVX	Difference
Sharpe ratio: Return per unit of total volatility	0.22	1.36	-1.13
Sortino ratio: Return per unit of downside risk	0.44	2.07	-1.63
Omega ratio: Gain probability vs. loss probability	1.05	1.24	-0.19
Calmar ratio: Return relative to maximum drawdown	0.23	1.89	-1.67
Martin ratio: Return relative to average drawdown	0.58	6.11	-5.53
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OTCAX vs. ACMVX - Sharpe Ratio Comparison

The current OTCAX Sharpe Ratio is 0.22, which is lower than the ACMVX Sharpe Ratio of 1.36. The chart below compares the historical Sharpe Ratios of OTCAX and ACMVX, 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

	OTCAX	ACMVX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.22	1.36	-1.13
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.27	0.46	-0.20
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.61	0.51	+0.10
Sharpe Ratio (All Time) Calculated using the full available price history	0.39	0.55	-0.16

Drawdowns

OTCAX vs. ACMVX - Drawdown Comparison

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

Drawdown Indicators

	OTCAX	ACMVX	Difference
Max Drawdown Largest peak-to-trough decline	-74.39%	-51.19%	-23.20%
Max Drawdown (1Y) Largest decline over 1 year	-16.46%	-8.49%	-7.97%
Max Drawdown (3Y) Largest decline over 3 years	-21.05%	-14.57%	-6.48%
Max Drawdown (5Y) Largest decline over 5 years	-36.85%	-17.46%	-19.39%
Max Drawdown (10Y) Largest decline over 10 years	-36.85%	-39.24%	+2.39%
Current Drawdown Current decline from peak	-3.57%	-1.52%	-2.05%
Average Drawdown Average peak-to-trough decline	-23.13%	-5.93%	-17.20%
Ulcer Index Depth and duration of drawdowns from previous peaks	6.40%	2.63%	+3.77%

Volatility

OTCAX vs. ACMVX - Volatility Comparison

MFS Mid Cap Growth Fund (OTCAX) has a higher volatility of 4.26% compared to American Century Mid Cap Value Fund (ACMVX) at 2.88%. This indicates that OTCAX's price experiences larger fluctuations and is considered to be riskier than ACMVX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OTCAX	ACMVX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.26%	2.88%	+1.38%
Volatility (6M) Calculated over the trailing 6-month period	13.31%	8.48%	+4.83%
Volatility (1Y) Calculated over the trailing 1-year period	16.53%	11.87%	+4.66%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.17%	14.64%	+5.53%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.96%	17.44%	+2.52%

OTCAX vs. ACMVX - Expense Ratio Comparison

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

Dividends

OTCAX vs. ACMVX - Dividend Comparison

OTCAX's dividend yield for the trailing twelve months is around 16.07%, more than ACMVX's 13.31% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACMVX American Century Mid Cap Value Fund	13.31%	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	16.07%	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 OTCAX and ACMVX in my portfolio?

OTCAX and ACMVX have a correlation of 0.51, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OTCAX or ACMVX?

OTCAX has higher volatility (4.26%) compared to ACMVX (2.88%). In terms of maximum drawdown, OTCAX dropped -74.39% vs ACMVX's -51.19%.

Which has better risk-adjusted returns?

ACMVX currently has the higher Sharpe Ratio (1.36 vs 0.22), 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.