OTCAX vs. VMGMX
OTCAX (MFS Mid Cap Growth Fund) and VMGMX (Vanguard Mid-Cap Growth Index Fund Admiral Shares) are both Mid Cap Growth Equities funds. Over the past 10 years, OTCAX returned 11.54%/yr vs 11.49%/yr for VMGMX. Their 0.96 correlation means they have historically moved very closely together. OTCAX charges 1.00%/yr vs 0.07%/yr for VMGMX.
Performance
OTCAX vs. VMGMX - Performance Comparison
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Returns By Period
In the year-to-date period, OTCAX achieves a 2.18% return, which is significantly lower than VMGMX's 6.02% return. Both investments have delivered pretty close results over the past 10 years, with OTCAX having a 11.54% annualized return and VMGMX not far behind at 11.49%.
OTCAX
- 1D
- 2.10%
- 1M
- -3.22%
- 6M
- 2.83%
- YTD
- 2.18%
- 1Y
- -1.26%
- 3Y*
- 11.20%
- 5Y*
- 3.22%
- 10Y*
- 11.54%
- ALL TIME*
- 8.63%
VMGMX
- 1D
- 1.52%
- 1M
- -2.07%
- 6M
- 7.00%
- YTD
- 6.02%
- 1Y
- 3.91%
- 3Y*
- 12.30%
- 5Y*
- 4.83%
- 10Y*
- 11.49%
- ALL TIME*
- 12.35%
Liquidity Comparison
| Position | Avg. Volume Value (2W) | Avg. Volume Value (1M) | Avg. Volume Value (3M) |
|---|---|---|---|
| $0.00 | $0.00 | $0.00 | |
| $0.00 | $0.00 | $0.00 |
OTCAX vs. VMGMX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
OTCAX MFS Mid Cap Growth Fund | 2.18% | 3.32% | 23.47% | 21.00% | -28.53% | 13.66% | 35.34% | 37.43% | 0.82% | 25.95% |
VMGMX Vanguard Mid-Cap Growth Index Fund Admiral Shares | 6.02% | 10.69% | 15.65% | 23.93% | -28.84% | 20.48% | 34.45% | 33.85% | -5.61% | 21.83% |
Correlation
The correlation between OTCAX and VMGMX is 0.95 - they have historically moved very closely together. At this level, their price movements offset little of one another.
| Correlation | |
|---|---|
Correlation (1Y) Focuses on recent behavior, but can change the most. | 0.95 |
Correlation (3Y) Balances recent behavior with more history. | 0.94 |
Correlation (5Y) Shows whether the relationship held over a longer period. | 0.96 |
Correlation (10Y) Provides a long-term view across more market conditions. | 0.96 |
Correlation (All Time) Calculated using the full available price history since Sep 27, 2011 | 0.96 |
The correlation between OTCAX and VMGMX has been stable across timeframes, ranging from 0.94 to 0.96 - a consistent structural relationship.
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Return for Risk
OTCAX vs. VMGMX — Risk / Return Rank
OTCAX
VMGMX
OTCAX vs. VMGMX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for MFS Mid Cap Growth Fund (OTCAX) and Vanguard Mid-Cap Growth Index Fund Admiral Shares (VMGMX). 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.
| OTCAX | VMGMX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.27 | ||
| Sortino ratioReturn per unit of downside risk | -0.38 | ||
| Omega ratioGain probability vs. loss probability | 0.99 | 1.03 | -0.04 |
| Calmar ratioReturn relative to maximum drawdown | -0.19 | 0.10 | -0.29 |
| Martin ratioReturn relative to average drawdown | -0.46 | 0.30 | -0.76 |
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Drawdowns
OTCAX vs. VMGMX - Drawdown Comparison
The maximum OTCAX drawdown since its inception was -74.39%, which is greater than VMGMX's maximum drawdown of -37.17%. Use the drawdown chart below to compare losses from any high point for OTCAX and VMGMX.
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Drawdown Indicators
| OTCAX | VMGMX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -74.39% | -37.17% | -37.22% |
Max Drawdown (1Y)Largest decline over 1 year | -16.46% | -15.95% | -0.51% |
Max Drawdown (3Y)Largest decline over 3 years | -21.05% | -21.65% | +0.60% |
Max Drawdown (5Y)Largest decline over 5 years | -36.85% | -37.17% | +0.32% |
Max Drawdown (10Y)Largest decline over 10 years | -36.85% | -37.17% | +0.32% |
Current DrawdownCurrent decline from peak | -5.51% | -3.76% | -1.75% |
Average DrawdownAverage peak-to-trough decline | -23.03% | -6.97% | -16.06% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 6.60% | 5.41% | +1.19% |
Volatility
OTCAX vs. VMGMX - Volatility Comparison
MFS Mid Cap Growth Fund (OTCAX) has a higher volatility of 4.82% compared to Vanguard Mid-Cap Growth Index Fund Admiral Shares (VMGMX) at 4.20%. This indicates that OTCAX's price experiences larger fluctuations and is considered to be riskier than VMGMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| OTCAX | VMGMX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.82% | 4.20% | +0.62% |
Volatility (6M)Calculated over the trailing 6-month period | 14.58% | 13.95% | +0.63% |
Volatility (1Y)Calculated over the trailing 1-year period | 17.73% | 17.30% | +0.43% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 20.39% | 21.63% | -1.24% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 20.02% | 21.03% | -1.01% |
OTCAX vs. VMGMX - Expense Ratio Comparison
OTCAX has a 1.00% expense ratio, which is higher than VMGMX's 0.07% expense ratio.
Dividends
OTCAX vs. VMGMX - Dividend Comparison
OTCAX's dividend yield for the trailing twelve months is around 16.40%, more than VMGMX's 0.61% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
OTCAX MFS Mid Cap Growth Fund | 16.40% | 16.76% | 15.59% | 0.00% | 0.00% | 3.64% | 0.83% | 0.86% | 4.70% | 8.80% | 5.67% | 2.84% |
VMGMX Vanguard Mid-Cap Growth Index Fund Admiral Shares | 0.61% | 0.64% | 0.67% | 0.71% | 0.78% | 0.34% | 0.56% | 0.78% | 0.84% | 0.72% | 0.81% | 0.82% |
Frequently Asked Questions
With a correlation of 0.95, OTCAX and VMGMX 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.
OTCAX has higher volatility (4.82%) compared to VMGMX (4.20%). In terms of maximum drawdown, OTCAX dropped -74.39% vs VMGMX's -37.17%.
VMGMX currently has the higher Sharpe Ratio (0.09 vs -0.17), 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.
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