REBAX vs. GMCDX

Last updated Jun 4, 2026

REBAX (Columbia Emerging Markets Bond Fund) and GMCDX (GMO Emerging Country Debt Fund) are both Emerging Markets Bonds funds. Over the past 10 years, REBAX returned 3.52%/yr vs 7.86%/yr for GMCDX. Their correlation of 0.81 suggests significant overlap in exposure. REBAX charges 1.12%/yr vs 0.53%/yr for GMCDX.

Performance

REBAX vs. GMCDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Columbia Emerging Markets Bond Fund (REBAX) and GMO Emerging Country Debt Fund (GMCDX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, REBAX achieves a 2.07% return, which is significantly lower than GMCDX's 8.70% return. Over the past 10 years, REBAX has underperformed GMCDX with an annualized return of 3.52%, while GMCDX has yielded a comparatively higher 7.86% annualized return.

REBAX

• 1D: 0.10%
• 1M: 1.07%
• YTD: 2.07%
• 6M: 2.49%
• 1Y: 11.68%
• 3Y*: 9.88%
• 5Y*: 2.24%
• 10Y*: 3.52%

GMCDX

• 1D: 0.33%
• 1M: 1.66%
• YTD: 8.70%
• 6M: 9.24%
• 1Y: 26.65%
• 3Y*: 20.34%
• 5Y*: 9.64%
• 10Y*: 7.86%

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

REBAX vs. GMCDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
REBAX Columbia Emerging Markets Bond Fund	2.07%	12.63%	5.98%	10.20%	-16.10%	-2.67%	7.42%	11.89%	-7.99%	12.15%
GMCDX GMO Emerging Country Debt Fund	8.70%	22.34%	13.39%	17.63%	-16.30%	6.56%	7.25%	14.28%	-5.89%	12.49%

Correlation

The correlation between REBAX and GMCDX is 0.88, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.88
Correlation (3Y) Calculated over the trailing 3-year period	0.85
Correlation (5Y) Calculated over the trailing 5-year period	0.86
Correlation (10Y) Calculated over the trailing 10-year period	0.88
Correlation (All Time) Calculated using the full available price history since Jan 4, 2007	0.81

The correlation between REBAX and GMCDX has been stable across timeframes, ranging from 0.81 to 0.88 - a consistent structural relationship.

Return for Risk

REBAX vs. GMCDX — Risk / Return Rank

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

REBAX

REBAX Risk / Return Rank: 77
REBAX Sharpe Ratio Rank: 90
REBAX Sortino Ratio Rank: 93
REBAX Omega Ratio Rank: 89
REBAX Calmar Ratio Rank: 52
REBAX Martin Ratio Rank: 58

GMCDX

GMCDX Risk / Return Rank: 98
GMCDX Sharpe Ratio Rank: 99
GMCDX Sortino Ratio Rank: 99
GMCDX Omega Ratio Rank: 98
GMCDX Calmar Ratio Rank: 97
GMCDX Martin Ratio Rank: 98

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.

REBAX vs. GMCDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Columbia Emerging Markets Bond Fund (REBAX) and GMO Emerging Country Debt Fund (GMCDX). 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.

	REBAX	GMCDX	Difference
Sharpe ratio: Return per unit of total volatility	3.01	5.17	-2.16
Sortino ratio: Return per unit of downside risk	4.80	9.25	-4.45
Omega ratio: Gain probability vs. loss probability	1.64	2.30	-0.66
Calmar ratio: Return relative to maximum drawdown	2.76	7.12	-4.35
Martin ratio: Return relative to average drawdown	11.62	30.83	-19.21
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

REBAX vs. GMCDX - Sharpe Ratio Comparison

The current REBAX Sharpe Ratio is 3.01, which is lower than the GMCDX Sharpe Ratio of 5.17. The chart below compares the historical Sharpe Ratios of REBAX and GMCDX, 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

	REBAX	GMCDX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.01	5.17	-2.16
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.36	0.86	-0.50
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.53	0.85	-0.32
Sharpe Ratio (All Time) Calculated using the full available price history	0.73	0.32	+0.42

Drawdowns

REBAX vs. GMCDX - Drawdown Comparison

The maximum REBAX drawdown since its inception was -34.43%, smaller than the maximum GMCDX drawdown of -68.24%. Use the drawdown chart below to compare losses from any high point for REBAX and GMCDX.

Drawdown Indicators

	REBAX	GMCDX	Difference
Max Drawdown Largest peak-to-trough decline	-34.43%	-68.24%	+33.81%
Max Drawdown (1Y) Largest decline over 1 year	-4.37%	-3.85%	-0.52%
Max Drawdown (3Y) Largest decline over 3 years	-6.28%	-9.00%	+2.72%
Max Drawdown (5Y) Largest decline over 5 years	-27.13%	-26.02%	-1.11%
Max Drawdown (10Y) Largest decline over 10 years	-27.13%	-26.02%	-1.11%
Current Drawdown Current decline from peak	-0.23%	0.00%	-0.23%
Average Drawdown Average peak-to-trough decline	-5.39%	-17.66%	+12.27%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.04%	0.89%	+0.15%

Volatility

REBAX vs. GMCDX - Volatility Comparison

The current volatility for Columbia Emerging Markets Bond Fund (REBAX) is 1.41%, while GMO Emerging Country Debt Fund (GMCDX) has a volatility of 1.52%. This indicates that REBAX experiences smaller price fluctuations and is considered to be less risky than GMCDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	REBAX	GMCDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.41%	1.52%	-0.11%
Volatility (6M) Calculated over the trailing 6-month period	3.25%	4.37%	-1.12%
Volatility (1Y) Calculated over the trailing 1-year period	4.02%	5.30%	-1.28%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	6.19%	11.20%	-5.01%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	6.66%	9.33%	-2.67%

REBAX vs. GMCDX - Expense Ratio Comparison

REBAX has a 1.12% expense ratio, which is higher than GMCDX's 0.53% expense ratio.

Dividends

REBAX vs. GMCDX - Dividend Comparison

REBAX's dividend yield for the trailing twelve months is around 4.37%, less than GMCDX's 5.77% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
GMCDX GMO Emerging Country Debt Fund	5.77%	6.27%	6.88%	10.26%	13.73%	17.75%	9.66%	6.60%	7.76%	7.06%	6.00%	2.50%
REBAX Columbia Emerging Markets Bond Fund	4.37%	4.66%	5.28%	4.79%	4.07%	3.31%	2.81%	3.38%	5.04%	5.05%	2.60%	3.14%

Frequently Asked Questions

Can I hold both REBAX and GMCDX in my portfolio?

REBAX and GMCDX have a correlation of 0.88, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, REBAX or GMCDX?

GMCDX has higher volatility (1.52%) compared to REBAX (1.41%). In terms of maximum drawdown, REBAX dropped -34.43% vs GMCDX's -68.24%.

Which has better risk-adjusted returns?

GMCDX currently has the higher Sharpe Ratio (5.17 vs 3.01), 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.