MFSI vs. IDEV
MFSI (MFS Active International ETF) and IDEV (iShares Core MSCI International Developed Markets ETF) are both Foreign Large Cap Equities funds. MFSI is actively managed, while IDEV is passively managed. Over the past year, MFSI returned 17.49% vs 23.20% for IDEV. Their correlation of 0.93 suggests significant overlap in exposure. MFSI charges 0.59%/yr vs 0.05%/yr for IDEV.
Performance
MFSI vs. IDEV - Performance Comparison
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Returns By Period
In the year-to-date period, MFSI achieves a 6.73% return, which is significantly lower than IDEV's 8.92% return.
MFSI
- 1D
- -1.16%
- 1M
- 5.04%
- YTD
- 6.73%
- 6M
- 9.01%
- 1Y
- 17.49%
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
IDEV
- 1D
- -0.90%
- 1M
- 3.23%
- YTD
- 8.92%
- 6M
- 11.57%
- 1Y
- 23.20%
- 3Y*
- 17.40%
- 5Y*
- 8.48%
- 10Y*
- —
MFSI vs. IDEV - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | |
|---|---|---|---|
MFSI MFS Active International ETF | 6.73% | 26.43% | -4.21% |
IDEV iShares Core MSCI International Developed Markets ETF | 8.92% | 32.56% | -4.45% |
Correlation
The correlation between MFSI and IDEV is 0.95 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.95 |
Correlation (All Time) Calculated using the full available price history since Dec 6, 2024 | 0.93 |
The correlation between MFSI and IDEV has been stable across timeframes, ranging from 0.93 to 0.95 - a consistent structural relationship.
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Return for Risk
MFSI vs. IDEV — Risk / Return Rank
MFSI
IDEV
MFSI vs. IDEV - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for MFS Active International ETF (MFSI) and iShares Core MSCI International Developed Markets ETF (IDEV). 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.
| MFSI | IDEV | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.41 | ||
| Sortino ratioReturn per unit of downside risk | -0.54 | ||
| Omega ratioGain probability vs. loss probability | 1.22 | 1.29 | -0.07 |
| Calmar ratioReturn relative to maximum drawdown | 1.57 | 2.08 | -0.51 |
| Martin ratioReturn relative to average drawdown | 5.89 | 8.16 | -2.27 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| MFSI | IDEV | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.20 | 1.61 | -0.41 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | — | 0.52 | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 1.17 | 0.55 | +0.62 |
Drawdowns
MFSI vs. IDEV - Drawdown Comparison
The maximum MFSI drawdown since its inception was -13.67%, smaller than the maximum IDEV drawdown of -34.77%. Use the drawdown chart below to compare losses from any high point for MFSI and IDEV.
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Drawdown Indicators
| MFSI | IDEV | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -13.67% | -34.77% | +21.10% |
Max Drawdown (1Y)Largest decline over 1 year | -11.17% | -11.20% | +0.03% |
Max Drawdown (3Y)Largest decline over 3 years | — | -13.41% | — |
Max Drawdown (5Y)Largest decline over 5 years | — | -29.15% | — |
Current DrawdownCurrent decline from peak | -1.16% | -0.98% | -0.18% |
Average DrawdownAverage peak-to-trough decline | -1.97% | -6.57% | +4.60% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 2.98% | 2.85% | +0.13% |
Volatility
MFSI vs. IDEV - Volatility Comparison
MFS Active International ETF (MFSI) and iShares Core MSCI International Developed Markets ETF (IDEV) have volatilities of 4.72% and 4.60%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| MFSI | IDEV | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.72% | 4.60% | +0.12% |
Volatility (6M)Calculated over the trailing 6-month period | 12.16% | 12.10% | +0.06% |
Volatility (1Y)Calculated over the trailing 1-year period | 14.62% | 14.51% | +0.11% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 16.32% | 16.26% | +0.06% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 16.32% | 17.27% | -0.95% |
MFSI vs. IDEV - Expense Ratio Comparison
MFSI has a 0.59% expense ratio, which is higher than IDEV's 0.05% expense ratio.
Dividends
MFSI vs. IDEV - Dividend Comparison
MFSI's dividend yield for the trailing twelve months is around 0.76%, less than IDEV's 3.13% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|
IDEV iShares Core MSCI International Developed Markets ETF | 3.13% | 3.40% | 3.30% | 3.07% | 2.69% | 3.05% | 2.00% | 3.18% | 3.16% | 1.54% |
MFSI MFS Active International ETF | 0.76% | 0.81% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |
Frequently Asked Questions
With a correlation of 0.95, MFSI and IDEV move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
MFSI has higher volatility (4.72%) compared to IDEV (4.60%). In terms of maximum drawdown, MFSI dropped -13.67% vs IDEV's -34.77%.
On 1-year performance, IDEV leads with 23.20% vs 17.49% for MFSI. On fees, IDEV is cheaper at 0.05% per year. On volatility, IDEV has been the lower-risk option at 4.60%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 1-year period, IDEV has performed better with a 23.20% return vs 17.49%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
IDEV is cheaper with a 0.05% expense ratio, compared with 0.59% for MFSI.
IDEV has the higher dividend yield at 3.13%, compared with 0.76% for MFSI.
They also come from different issuers: MFS and iShares. Their fees differ too: 0.59% for MFSI and 0.05% for IDEV.
IDEV currently has the higher Sharpe Ratio (1.61 vs 1.20), 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.
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