TRIEX vs. MIEKX

Last updated Apr 1, 2026

Compare and contrast key facts about Nuveen International Equity Index Fund Retirement Class (TRIEX) and MFS International Equity Fund Class R6 (MIEKX).

TRIEX is a passively managed fund by Nuveen that tracks the performance of the MSCI EAFE Index. It was launched on Oct 1, 2002. MIEKX is an actively managed fund by MFS. It was launched on Jan 31, 1996.

Performance

TRIEX vs. MIEKX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Nuveen International Equity Index Fund Retirement Class (TRIEX) and MFS International Equity Fund Class R6 (MIEKX). The values are adjusted to include any dividend payments, if applicable.

TRIEX vs. MIEKX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
TRIEX Nuveen International Equity Index Fund Retirement Class	-1.96%	31.24%	3.41%	6.12%
MIEKX MFS International Equity Fund Class R6	-6.59%	23.12%	4.02%	5.55%

Returns By Period

In the year-to-date period, TRIEX achieves a -1.96% return, which is significantly higher than MIEKX's -6.59% return.

TRIEX

• 1D: 0.36%
• 1M: -10.86%
• YTD: -1.96%
• 6M: 2.21%
• 1Y: 19.23%
• 3Y*: 13.08%
• 5Y*: 7.60%
• 10Y*: 8.31%

MIEKX

• 1D: 0.48%
• 1M: -10.88%
• YTD: -6.59%
• 6M: -3.52%
• 1Y: 7.89%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

TRIEX vs. MIEKX - Expense Ratio Comparison

TRIEX has a 0.30% expense ratio, which is lower than MIEKX's 0.73% expense ratio.

MIEKX

MFS International Equity Fund Class R6

TRIEX

Nuveen International Equity Index Fund Retirement Class

Return for Risk

TRIEX vs. MIEKX — Risk / Return Rank

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

TRIEX

TRIEX Risk / Return Rank: 57
TRIEX Sharpe Ratio Rank: 57
TRIEX Sortino Ratio Rank: 54
TRIEX Omega Ratio Rank: 51
TRIEX Calmar Ratio Rank: 62
TRIEX Martin Ratio Rank: 59

MIEKX

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

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.

TRIEX vs. MIEKX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Nuveen International Equity Index Fund Retirement Class (TRIEX) and MFS International Equity Fund Class R6 (MIEKX). 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.

	TRIEX	MIEKX	Difference
Sharpe ratio Return per unit of total volatility	1.07	0.45	+0.63
Sortino ratio Return per unit of downside risk	1.51	0.67	+0.84
Omega ratio Gain probability vs. loss probability	1.21	1.09	+0.12
Calmar ratio Return relative to maximum drawdown	1.46	0.51	+0.95
Martin ratio Return relative to average drawdown	5.71	1.89	+3.81
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TRIEX vs. MIEKX - Sharpe Ratio Comparison

The current TRIEX Sharpe Ratio is 1.07, which is higher than the MIEKX Sharpe Ratio of 0.45. The chart below compares the historical Sharpe Ratios of TRIEX and MIEKX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	TRIEX	MIEKX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.07	0.45	+0.63
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.48	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.50	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.39	0.65	-0.26

Correlation

The correlation between TRIEX and MIEKX is 0.94, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

TRIEX vs. MIEKX - Dividend Comparison

TRIEX's dividend yield for the trailing twelve months is around 3.64%, more than MIEKX's 2.78% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TRIEX Nuveen International Equity Index Fund Retirement Class	3.64%	3.57%	2.84%	2.83%	2.49%	2.69%	1.70%	2.78%	3.05%	2.51%	2.65%	2.72%
MIEKX MFS International Equity Fund Class R6	2.78%	2.60%	1.41%	1.67%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Drawdowns

TRIEX vs. MIEKX - Drawdown Comparison

The maximum TRIEX drawdown since its inception was -60.73%, which is greater than MIEKX's maximum drawdown of -13.42%. Use the drawdown chart below to compare losses from any high point for TRIEX and MIEKX.

Drawdown Indicators

	TRIEX	MIEKX	Difference
Max Drawdown Largest peak-to-trough decline	-60.73%	-13.42%	-47.31%
Max Drawdown (1Y) Largest decline over 1 year	-11.37%	-11.30%	-0.07%
Max Drawdown (5Y) Largest decline over 5 years	-29.44%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-33.96%	—	—
Current Drawdown Current decline from peak	-10.89%	-10.88%	-0.01%
Average Drawdown Average peak-to-trough decline	-11.50%	-2.79%	-8.71%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.04%	3.05%	-0.01%

Volatility

TRIEX vs. MIEKX - Volatility Comparison

Nuveen International Equity Index Fund Retirement Class (TRIEX) has a higher volatility of 7.11% compared to MFS International Equity Fund Class R6 (MIEKX) at 6.03%. This indicates that TRIEX's price experiences larger fluctuations and is considered to be riskier than MIEKX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TRIEX	MIEKX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.11%	6.03%	+1.08%
Volatility (6M) Calculated over the trailing 6-month period	10.85%	9.42%	+1.43%
Volatility (1Y) Calculated over the trailing 1-year period	16.96%	14.87%	+2.09%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.89%	13.08%	+2.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.56%	13.08%	+3.48%