GWMEX vs. BRWIX

Last updated Jun 23, 2026

GWMEX (AMG GW&K Municipal Enhanced Yield Fund) and BRWIX (AMG Boston Common Global Impact Fund) are both mutual funds - GWMEX is a High Yield Muni fund managed by AMG, while BRWIX is a Large Cap Growth Equities fund managed by AMG. Over the past 10 years, GWMEX returned 3.40%/yr vs 11.21%/yr for BRWIX. At a correlation of -0.04, they often move in opposite directions. GWMEX charges 0.64%/yr vs 0.93%/yr for BRWIX.

Performance

GWMEX vs. BRWIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AMG GW&K Municipal Enhanced Yield Fund (GWMEX) 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, GWMEX achieves a 2.65% return, which is significantly lower than BRWIX's 15.59% return. Over the past 10 years, GWMEX has underperformed BRWIX with an annualized return of 3.40%, while BRWIX has yielded a comparatively higher 11.21% annualized return.

GWMEX

• 1D: 0.11%
• 1M: 2.40%
• YTD: 2.65%
• 6M: 3.00%
• 1Y: 8.44%
• 3Y*: 4.23%
• 5Y*: 1.74%
• 10Y*: 3.40%

BRWIX

• 1D: 1.77%
• 1M: 1.71%
• YTD: 15.59%
• 6M: 15.59%
• 1Y: 35.06%
• 3Y*: 13.55%
• 5Y*: 5.41%
• 10Y*: 11.21%

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

GWMEX vs. BRWIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
GWMEX AMG GW&K Municipal Enhanced Yield Fund	2.65%	2.50%	2.61%	10.89%	-17.86%	15.05%	6.32%	12.51%	-0.06%	9.79%
BRWIX AMG Boston Common Global Impact Fund	15.59%	21.16%	3.08%	13.75%	-25.35%	12.38%	29.77%	27.98%	-3.67%	23.65%

Correlation

The correlation between GWMEX and BRWIX is 0.24, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.24
Correlation (3Y) Calculated over the trailing 3-year period	0.21
Correlation (5Y) Calculated over the trailing 5-year period	0.19
Correlation (10Y) Calculated over the trailing 10-year period	0.09
Correlation (All Time) Calculated using the full available price history since Jan 3, 2006	-0.04

The correlation between GWMEX and BRWIX shifts across timeframes, from -0.04 (all time) to 0.24 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

GWMEX vs. BRWIX — Risk / Return Rank

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

GWMEX

GWMEX Risk / Return Rank: 60
GWMEX Sharpe Ratio Rank: 68
GWMEX Sortino Ratio Rank: 76
GWMEX Omega Ratio Rank: 84
GWMEX Calmar Ratio Rank: 37
GWMEX Martin Ratio Rank: 37

BRWIX

BRWIX Risk / Return Rank: 71
BRWIX Sharpe Ratio Rank: 73
BRWIX Sortino Ratio Rank: 69
BRWIX Omega Ratio Rank: 66
BRWIX Calmar Ratio Rank: 70
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.

GWMEX vs. BRWIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AMG GW&K Municipal Enhanced Yield Fund (GWMEX) 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.

	GWMEX	BRWIX	Difference
Sharpe ratio: Return per unit of total volatility	2.21	2.29	-0.07
Sortino ratio: Return per unit of downside risk	3.32	3.15	+0.17
Omega ratio: Gain probability vs. loss probability	1.52	1.41	+0.11
Calmar ratio: Return relative to maximum drawdown	2.19	3.08	-0.89
Martin ratio: Return relative to average drawdown	7.78	13.56	-5.78

GWMEX vs. BRWIX - Sharpe Ratio Comparison

The current GWMEX Sharpe Ratio is 2.21, which is comparable to the BRWIX Sharpe Ratio of 2.29. The chart below compares the historical Sharpe Ratios of GWMEX 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

GWMEX vs. BRWIX - Drawdown Comparison

The maximum GWMEX drawdown since its inception was -36.30%, smaller than the maximum BRWIX drawdown of -54.49%. Use the drawdown chart below to compare losses from any high point for GWMEX and BRWIX.

Drawdown Indicators

	GWMEX	BRWIX	Difference
Max Drawdown Largest peak-to-trough decline	-36.30%	-54.49%	+18.19%
Max Drawdown (1Y) Largest decline over 1 year	-3.95%	-11.28%	+7.33%
Max Drawdown (3Y) Largest decline over 3 years	-9.08%	-20.82%	+11.74%
Max Drawdown (5Y) Largest decline over 5 years	-24.06%	-36.71%	+12.65%
Max Drawdown (10Y) Largest decline over 10 years	-24.06%	-36.71%	+12.65%
Current Drawdown Current decline from peak	-1.75%	-0.63%	-1.12%
Average Drawdown Average peak-to-trough decline	-5.69%	-17.57%	+11.88%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.11%	2.56%	-1.45%

Volatility

GWMEX vs. BRWIX - Volatility Comparison

The current volatility for AMG GW&K Municipal Enhanced Yield Fund (GWMEX) is 0.91%, while AMG Boston Common Global Impact Fund (BRWIX) has a volatility of 6.19%. This indicates that GWMEX experiences smaller price fluctuations and is considered to be less risky than BRWIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	GWMEX	BRWIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.91%	6.19%	-5.28%
Volatility (6M) Calculated over the trailing 6-month period	2.93%	12.79%	-9.86%
Volatility (1Y) Calculated over the trailing 1-year period	3.90%	15.18%	-11.28%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	7.80%	18.29%	-10.49%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	6.75%	20.22%	-13.47%

GWMEX vs. BRWIX - Expense Ratio Comparison

GWMEX has a 0.64% expense ratio, which is lower than BRWIX's 0.93% expense ratio.

Dividends

GWMEX vs. BRWIX - Dividend Comparison

GWMEX's dividend yield for the trailing twelve months is around 3.40%, more than BRWIX's 0.65% yield.

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%
GWMEX AMG GW&K Municipal Enhanced Yield Fund	3.40%	3.67%	3.38%	3.10%	3.33%	13.26%	3.63%	4.59%	5.82%	2.97%	7.96%	4.77%

Frequently Asked Questions

Can I hold both GWMEX and BRWIX in my portfolio?

GWMEX and BRWIX have a correlation of 0.24, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, GWMEX or BRWIX?

BRWIX has higher volatility (6.19%) compared to GWMEX (0.91%). In terms of maximum drawdown, GWMEX dropped -36.30% vs BRWIX's -54.49%.

Which has better risk-adjusted returns?

BRWIX currently has the higher Sharpe Ratio (2.29 vs 2.21), 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.