VMGAX vs. MRFOX

Last updated Jun 24, 2026

VMGAX (Vanguard Mega Cap Growth Index Fund Institutional Shares) and MRFOX (Marshfield Concentrated Opportunity Fund) are both Large Cap Growth Equities funds. Over the past 10 years, VMGAX returned 19.24%/yr vs 16.16%/yr for MRFOX. A 0.62 correlation means they provide meaningful diversification when combined. VMGAX charges 0.06%/yr vs 1.05%/yr for MRFOX.

Performance

VMGAX vs. MRFOX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Mega Cap Growth Index Fund Institutional Shares (VMGAX) and Marshfield Concentrated Opportunity Fund (MRFOX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VMGAX achieves a 5.90% return, which is significantly higher than MRFOX's 0.96% return. Over the past 10 years, VMGAX has outperformed MRFOX with an annualized return of 19.24%, while MRFOX has yielded a comparatively lower 16.16% annualized return.

VMGAX

• 1D: -1.41%
• 1M: -1.82%
• YTD: 5.90%
• 6M: 4.57%
• 1Y: 24.29%
• 3Y*: 24.22%
• 5Y*: 14.45%
• 10Y*: 19.24%

MRFOX

• 1D: -0.43%
• 1M: -0.75%
• YTD: 0.96%
• 6M: 0.26%
• 1Y: 9.04%
• 3Y*: 13.81%
• 5Y*: 11.31%
• 10Y*: 16.16%

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

VMGAX vs. MRFOX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VMGAX Vanguard Mega Cap Growth Index Fund Institutional Shares	5.90%	20.73%	32.98%	51.57%	-33.55%	28.50%	41.02%	37.54%	-2.86%	29.49%
MRFOX Marshfield Concentrated Opportunity Fund	0.96%	10.05%	17.10%	17.68%	5.06%	17.71%	15.19%	36.26%	1.89%	25.92%

Correlation

The correlation between VMGAX and MRFOX is 0.18, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.18
Correlation (3Y) Calculated over the trailing 3-year period	0.37
Correlation (5Y) Calculated over the trailing 5-year period	0.54
Correlation (10Y) Calculated over the trailing 10-year period	0.61
Correlation (All Time) Calculated using the full available price history since Jan 4, 2016	0.62

Over the past year, the correlation between VMGAX and MRFOX has dropped to 0.18 - well below their long-term average of 0.62, suggesting their price drivers have been diverging.

Return for Risk

VMGAX vs. MRFOX — Risk / Return Rank

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

VMGAX

VMGAX Risk / Return Rank: 27
VMGAX Sharpe Ratio Rank: 32
VMGAX Sortino Ratio Rank: 29
VMGAX Omega Ratio Rank: 29
VMGAX Calmar Ratio Rank: 20
VMGAX Martin Ratio Rank: 23

MRFOX

MRFOX Risk / Return Rank: 16
MRFOX Sharpe Ratio Rank: 15
MRFOX Sortino Ratio Rank: 16
MRFOX Omega Ratio Rank: 14
MRFOX Calmar Ratio Rank: 18
MRFOX Martin Ratio Rank: 17

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.

VMGAX vs. MRFOX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Mega Cap Growth Index Fund Institutional Shares (VMGAX) and Marshfield Concentrated Opportunity Fund (MRFOX). 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.

	VMGAX	MRFOX	Difference
Sharpe ratio: Return per unit of total volatility	1.50	1.03	+0.48
Sortino ratio: Return per unit of downside risk	2.06	1.57	+0.50
Omega ratio: Gain probability vs. loss probability	1.26	1.18	+0.08
Calmar ratio: Return relative to maximum drawdown	1.54	1.43	+0.11
Martin ratio: Return relative to average drawdown	5.22	4.23	+0.99

VMGAX vs. MRFOX - Sharpe Ratio Comparison

The current VMGAX Sharpe Ratio is 1.50, which is higher than the MRFOX Sharpe Ratio of 1.03. The chart below compares the historical Sharpe Ratios of VMGAX and MRFOX, 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

VMGAX vs. MRFOX - Drawdown Comparison

The maximum VMGAX drawdown since its inception was -47.97%, which is greater than MRFOX's maximum drawdown of -29.10%. Use the drawdown chart below to compare losses from any high point for VMGAX and MRFOX.

Drawdown Indicators

	VMGAX	MRFOX	Difference
Max Drawdown Largest peak-to-trough decline	-47.97%	-29.10%	-18.87%
Max Drawdown (1Y) Largest decline over 1 year	-16.78%	-7.03%	-9.75%
Max Drawdown (3Y) Largest decline over 3 years	-23.45%	-7.91%	-15.54%
Max Drawdown (5Y) Largest decline over 5 years	-36.03%	-12.98%	-23.05%
Max Drawdown (10Y) Largest decline over 10 years	-36.03%	-29.10%	-6.93%
Current Drawdown Current decline from peak	-5.12%	-1.48%	-3.64%
Average Drawdown Average peak-to-trough decline	-7.43%	-2.36%	-5.07%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.95%	2.37%	+2.58%

Volatility

VMGAX vs. MRFOX - Volatility Comparison

Vanguard Mega Cap Growth Index Fund Institutional Shares (VMGAX) has a higher volatility of 6.81% compared to Marshfield Concentrated Opportunity Fund (MRFOX) at 2.88%. This indicates that VMGAX's price experiences larger fluctuations and is considered to be riskier than MRFOX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VMGAX	MRFOX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.81%	2.88%	+3.93%
Volatility (6M) Calculated over the trailing 6-month period	13.71%	6.89%	+6.82%
Volatility (1Y) Calculated over the trailing 1-year period	17.27%	9.84%	+7.43%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.86%	12.07%	+10.79%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.99%	14.25%	+7.74%

VMGAX vs. MRFOX - Expense Ratio Comparison

VMGAX has a 0.06% expense ratio, which is lower than MRFOX's 1.05% expense ratio.

Dividends

VMGAX vs. MRFOX - Dividend Comparison

VMGAX's dividend yield for the trailing twelve months is around 0.34%, less than MRFOX's 1.60% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MRFOX Marshfield Concentrated Opportunity Fund	1.60%	1.62%	4.59%	0.46%	0.35%	6.78%	2.68%	1.39%	1.94%	2.06%	0.60%	0.00%
VMGAX Vanguard Mega Cap Growth Index Fund Institutional Shares	0.34%	0.36%	0.44%	0.51%	0.71%	0.42%	0.65%	0.86%	1.13%	1.23%	1.53%	1.44%

Frequently Asked Questions

Can I hold both VMGAX and MRFOX in my portfolio?

VMGAX and MRFOX have a correlation of 0.18, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, VMGAX or MRFOX?

VMGAX has higher volatility (6.81%) compared to MRFOX (2.88%). In terms of maximum drawdown, VMGAX dropped -47.97% vs MRFOX's -29.10%.

Which has better risk-adjusted returns?

VMGAX currently has the higher Sharpe Ratio (1.50 vs 1.03), 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.