MSSCX vs. BRWIX

Last updated Jun 24, 2026

MSSCX (AMG Frontier Small Cap Growth Fund) and BRWIX (AMG Boston Common Global Impact Fund) are both mutual funds - MSSCX is a Small Cap Growth Equities fund managed by AMG, while BRWIX is a Large Cap Growth Equities fund managed by AMG. Over the past 10 years, MSSCX returned 17.15%/yr vs 11.44%/yr for BRWIX. Their correlation of 0.84 suggests significant overlap in exposure. MSSCX charges 0.94%/yr vs 0.93%/yr for BRWIX.

Performance

MSSCX vs. BRWIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AMG Frontier Small Cap Growth Fund (MSSCX) and AMG Boston Common Global Impact Fund (BRWIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MSSCX achieves a 24.13% return, which is significantly higher than BRWIX's 15.33% return. Over the past 10 years, MSSCX has outperformed BRWIX with an annualized return of 17.15%, while BRWIX has yielded a comparatively lower 11.44% annualized return.

MSSCX

• 1D: 1.65%
• 1M: 3.90%
• YTD: 24.13%
• 6M: 22.06%
• 1Y: 40.65%
• 3Y*: 15.58%
• 5Y*: 7.43%
• 10Y*: 17.15%

BRWIX

• 1D: -0.22%
• 1M: 1.48%
• YTD: 15.33%
• 6M: 14.66%
• 1Y: 33.33%
• 3Y*: 14.59%
• 5Y*: 5.07%
• 10Y*: 11.44%

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

MSSCX vs. BRWIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MSSCX AMG Frontier Small Cap Growth Fund	24.13%	7.63%	10.88%	23.41%	-21.47%	16.33%	39.13%	46.03%	2.22%	21.23%
BRWIX AMG Boston Common Global Impact Fund	15.33%	21.16%	3.08%	13.75%	-25.35%	12.38%	29.77%	27.98%	-3.67%	23.65%

Correlation

The correlation between MSSCX and BRWIX is 0.78, 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	0.78
Correlation (3Y) Calculated over the trailing 3-year period	0.82
Correlation (5Y) Calculated over the trailing 5-year period	0.84
Correlation (10Y) Calculated over the trailing 10-year period	0.85
Correlation (All Time) Calculated using the full available price history since Sep 25, 1997	0.84

The correlation between MSSCX and BRWIX has been stable across timeframes, ranging from 0.78 to 0.85 - a consistent structural relationship.

Return for Risk

MSSCX vs. BRWIX — Risk / Return Rank

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

MSSCX

MSSCX Risk / Return Rank: 51
MSSCX Sharpe Ratio Rank: 37
MSSCX Sortino Ratio Rank: 32
MSSCX Omega Ratio Rank: 33
MSSCX Calmar Ratio Rank: 86
MSSCX Martin Ratio Rank: 64

BRWIX

BRWIX Risk / Return Rank: 71
BRWIX Sharpe Ratio Rank: 74
BRWIX Sortino Ratio Rank: 69
BRWIX Omega Ratio Rank: 66
BRWIX Calmar Ratio Rank: 71
BRWIX Martin Ratio Rank: 78

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.

MSSCX vs. BRWIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AMG Frontier Small Cap Growth Fund (MSSCX) and AMG Boston Common Global Impact Fund (BRWIX). 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.

	MSSCX	BRWIX	Difference
Sharpe ratio: Return per unit of total volatility	1.64	2.30	-0.66
Sortino ratio: Return per unit of downside risk	2.18	3.16	-0.98
Omega ratio: Gain probability vs. loss probability	1.28	1.41	-0.13
Calmar ratio: Return relative to maximum drawdown	3.94	3.10	+0.85
Martin ratio: Return relative to average drawdown	11.79	13.63	-1.84

MSSCX vs. BRWIX - Sharpe Ratio Comparison

The current MSSCX Sharpe Ratio is 1.64, which is comparable to the BRWIX Sharpe Ratio of 2.30. The chart below compares the historical Sharpe Ratios of MSSCX and BRWIX, 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

MSSCX vs. BRWIX - Drawdown Comparison

The maximum MSSCX drawdown since its inception was -78.46%, which is greater than BRWIX's maximum drawdown of -54.49%. Use the drawdown chart below to compare losses from any high point for MSSCX and BRWIX.

Drawdown Indicators

	MSSCX	BRWIX	Difference
Max Drawdown Largest peak-to-trough decline	-78.46%	-54.49%	-23.97%
Max Drawdown (1Y) Largest decline over 1 year	-10.80%	-11.28%	+0.48%
Max Drawdown (3Y) Largest decline over 3 years	-33.02%	-20.82%	-12.20%
Max Drawdown (5Y) Largest decline over 5 years	-33.02%	-36.71%	+3.69%
Max Drawdown (10Y) Largest decline over 10 years	-46.70%	-36.71%	-9.99%
Current Drawdown Current decline from peak	0.00%	-0.85%	+0.85%
Average Drawdown Average peak-to-trough decline	-28.16%	-17.57%	-10.59%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.59%	2.56%	+1.03%

Volatility

MSSCX vs. BRWIX - Volatility Comparison

AMG Frontier Small Cap Growth Fund (MSSCX) has a higher volatility of 8.53% compared to AMG Boston Common Global Impact Fund (BRWIX) at 6.10%. This indicates that MSSCX's price experiences larger fluctuations and is considered to be riskier than BRWIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MSSCX	BRWIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	8.53%	6.10%	+2.43%
Volatility (6M) Calculated over the trailing 6-month period	19.76%	12.73%	+7.03%
Volatility (1Y) Calculated over the trailing 1-year period	26.04%	15.20%	+10.84%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	26.50%	18.29%	+8.21%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	26.55%	20.22%	+6.33%

MSSCX vs. BRWIX - Expense Ratio Comparison

MSSCX has a 0.94% expense ratio, which is higher than BRWIX's 0.93% expense ratio.

Dividends

MSSCX vs. BRWIX - Dividend Comparison

MSSCX has not paid dividends to shareholders, while BRWIX's dividend yield for the trailing twelve months is around 0.65%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BRWIX AMG Boston Common Global Impact Fund	0.65%	0.75%	1.17%	0.63%	0.48%	45.72%	14.71%	10.30%	0.00%	0.00%	0.00%	0.00%
MSSCX AMG Frontier Small Cap Growth Fund	0.00%	0.00%	9.23%	1.14%	0.00%	43.52%	3.34%	17.24%	59.21%	27.92%	0.43%	28.21%

Frequently Asked Questions

Can I hold both MSSCX and BRWIX in my portfolio?

MSSCX and BRWIX have a correlation of 0.78, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MSSCX or BRWIX?

MSSCX has higher volatility (8.53%) compared to BRWIX (6.10%). In terms of maximum drawdown, MSSCX dropped -78.46% vs BRWIX's -54.49%.

Which has better risk-adjusted returns?

BRWIX currently has the higher Sharpe Ratio (2.30 vs 1.64), 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.