OIIEX vs. GTMIX

Last updated Jun 4, 2026

OIIEX (Optimum International Fund) and GTMIX (GMO Tax-Managed International Equities Fund) are both Foreign Large Cap Equities funds. Over the past 10 years, OIIEX returned 9.34%/yr vs 10.16%/yr for GTMIX. Their correlation of 0.90 suggests significant overlap in exposure. OIIEX charges 1.04%/yr vs 0.68%/yr for GTMIX.

Performance

OIIEX vs. GTMIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Optimum International Fund (OIIEX) and GMO Tax-Managed International Equities Fund (GTMIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, OIIEX achieves a 17.33% return, which is significantly higher than GTMIX's 14.34% return. Over the past 10 years, OIIEX has underperformed GTMIX with an annualized return of 9.34%, while GTMIX has yielded a comparatively higher 10.16% annualized return.

OIIEX

• 1D: 0.65%
• 1M: 8.39%
• YTD: 17.33%
• 6M: 20.70%
• 1Y: 28.83%
• 3Y*: 19.82%
• 5Y*: 7.00%
• 10Y*: 9.34%

GTMIX

• 1D: 0.75%
• 1M: 3.02%
• YTD: 14.34%
• 6M: 18.93%
• 1Y: 39.04%
• 3Y*: 22.47%
• 5Y*: 11.01%
• 10Y*: 10.16%

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

OIIEX vs. GTMIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
OIIEX Optimum International Fund	17.33%	25.99%	8.41%	17.37%	-23.04%	8.52%	12.57%	19.60%	-13.98%	30.46%
GTMIX GMO Tax-Managed International Equities Fund	14.34%	46.17%	1.54%	14.96%	-10.13%	10.71%	7.50%	23.35%	-21.23%	28.45%

Correlation

The correlation between OIIEX and GTMIX is 0.73, 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	0.73
Correlation (3Y) Calculated over the trailing 3-year period	0.75
Correlation (5Y) Calculated over the trailing 5-year period	0.80
Correlation (10Y) Calculated over the trailing 10-year period	0.85
Correlation (All Time) Calculated using the full available price history since Jul 24, 2003	0.90

The correlation between OIIEX and GTMIX shifts across timeframes, from 0.73 (1 year) to 0.90 (all time), reflecting how their relationship changes across market environments.

Return for Risk

OIIEX vs. GTMIX — Risk / Return Rank

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

OIIEX

OIIEX Risk / Return Rank: 42
OIIEX Sharpe Ratio Rank: 42
OIIEX Sortino Ratio Rank: 40
OIIEX Omega Ratio Rank: 44
OIIEX Calmar Ratio Rank: 41
OIIEX Martin Ratio Rank: 44

GTMIX

GTMIX Risk / Return Rank: 88
GTMIX Sharpe Ratio Rank: 90
GTMIX Sortino Ratio Rank: 86
GTMIX Omega Ratio Rank: 81
GTMIX Calmar Ratio Rank: 91
GTMIX Martin Ratio Rank: 91

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.

OIIEX vs. GTMIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Optimum International Fund (OIIEX) and GMO Tax-Managed International Equities Fund (GTMIX). 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.

	OIIEX	GTMIX	Difference
Sharpe ratio: Return per unit of total volatility	1.92	2.98	-1.06
Sortino ratio: Return per unit of downside risk	2.64	4.08	-1.44
Omega ratio: Gain probability vs. loss probability	1.36	1.54	-0.18
Calmar ratio: Return relative to maximum drawdown	2.41	4.84	-2.43
Martin ratio: Return relative to average drawdown	9.26	18.65	-9.38
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

OIIEX vs. GTMIX - Sharpe Ratio Comparison

The current OIIEX Sharpe Ratio is 1.92, which is lower than the GTMIX Sharpe Ratio of 2.98. The chart below compares the historical Sharpe Ratios of OIIEX and GTMIX, 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

	OIIEX	GTMIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.92	2.98	-1.06
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.42	0.74	-0.32
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.55	0.64	-0.09
Sharpe Ratio (All Time) Calculated using the full available price history	0.38	0.41	-0.02

Drawdowns

OIIEX vs. GTMIX - Drawdown Comparison

The maximum OIIEX drawdown since its inception was -58.10%, roughly equal to the maximum GTMIX drawdown of -58.31%. Use the drawdown chart below to compare losses from any high point for OIIEX and GTMIX.

Drawdown Indicators

	OIIEX	GTMIX	Difference
Max Drawdown Largest peak-to-trough decline	-58.10%	-58.31%	+0.21%
Max Drawdown (1Y) Largest decline over 1 year	-11.93%	-7.90%	-4.03%
Max Drawdown (3Y) Largest decline over 3 years	-14.64%	-14.11%	-0.53%
Max Drawdown (5Y) Largest decline over 5 years	-37.09%	-28.81%	-8.28%
Max Drawdown (10Y) Largest decline over 10 years	-37.43%	-40.32%	+2.89%
Current Drawdown Current decline from peak	0.00%	-0.27%	+0.27%
Average Drawdown Average peak-to-trough decline	-12.44%	-12.68%	+0.24%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.09%	2.05%	+1.04%

Volatility

OIIEX vs. GTMIX - Volatility Comparison

Optimum International Fund (OIIEX) has a higher volatility of 4.72% compared to GMO Tax-Managed International Equities Fund (GTMIX) at 3.49%. This indicates that OIIEX's price experiences larger fluctuations and is considered to be riskier than GTMIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	OIIEX	GTMIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.72%	3.49%	+1.23%
Volatility (6M) Calculated over the trailing 6-month period	12.50%	9.67%	+2.83%
Volatility (1Y) Calculated over the trailing 1-year period	14.99%	12.85%	+2.14%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.75%	14.93%	+1.82%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.14%	16.05%	+1.09%

OIIEX vs. GTMIX - Expense Ratio Comparison

OIIEX has a 1.04% expense ratio, which is higher than GTMIX's 0.68% expense ratio.

Dividends

OIIEX vs. GTMIX - Dividend Comparison

OIIEX's dividend yield for the trailing twelve months is around 1.19%, less than GTMIX's 19.62% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
GTMIX GMO Tax-Managed International Equities Fund	19.62%	22.43%	5.94%	0.36%	5.44%	16.55%	2.25%	4.13%	7.25%	2.96%	4.05%	3.26%
OIIEX Optimum International Fund	1.19%	1.40%	1.62%	1.37%	3.08%	15.53%	3.16%	2.10%	8.98%	2.06%	1.16%	0.80%

Frequently Asked Questions

Can I hold both OIIEX and GTMIX in my portfolio?

OIIEX and GTMIX have a correlation of 0.73, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, OIIEX or GTMIX?

OIIEX has higher volatility (4.72%) compared to GTMIX (3.49%). In terms of maximum drawdown, OIIEX dropped -58.10% vs GTMIX's -58.31%.

Which has better risk-adjusted returns?

GTMIX currently has the higher Sharpe Ratio (2.98 vs 1.92), 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.