Data as of Oct 28, 2026.
IDEV vs IWM: Differences, Returns & Fees
Over the year to Oct 28, 2026, IDEV returned +13.4% to IWM's +14.1%; 2% of their weight is in the same names.
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Net assets: $34.0bn on Oct 28, 2026 for iShares Core MSCI International Developed Markets ETF, and $75.5bn on Oct 27, 2026 for iShares Russell 2000 ETF.
Pair scorecard
IDEV costs 0.15 points a year less; their one-year returns differ by 0.7 points; IWM is 2.2 times larger.
| Measure | IDEV | IWM |
|---|---|---|
| Return | ||
| Total return, 1 year | +13.4% | +14.1% |
| Drawdown | ||
| Below its high | 4.4%, high on Aug 25, 2026 | 7.6%, high on Aug 14, 2026 |
| Benchmark | ||
| What it tracks | MSCI World ex USA Investable Market Index | Russell 2000 Index |
| Cost and size | ||
| Expense ratio | 0.04% | 0.19% |
| Net assets, as of Oct 26, 2026 | $33.7bn | $74.6bn |
| Holdings | ||
| Holdings in common | 2% | |
| Top ten holdings, share of the fund | 10.9% | 3.3% |
Holdings in common uses holdings dated Oct 27, 2026. Method
Risk and return
Mar 31, 2017 to Oct 23, 2026 · 499 weekly returnsEach against its own benchmark: IDEV against ACWX, Mar 31, 2017 to Oct 23, 2026; IWM against VTWO, Oct 1, 2010 to Oct 23, 2026.
IDEV and IWM returned about the same: +127.7% and +125.8%. IDEV swung less: 17.0% to 23.0%. IDEV fell less at its worst: −34.0% to −40.2%.
Full scorecard
19 measures, with how each is measured Open ↓
| Measure | IDEV | IWM | Edge | How it is measured |
|---|---|---|---|---|
| Return | ||||
| Total return | +127.7% | +125.8% | Tie | Price change plus distributions, reinvested. |
| Annualized | +9.0% | +8.9% | Tie | Total return as a yearly rate. |
| Price return | +73.6% | +100.6% | IWM | Price change alone, distributions left out. |
| Risk | ||||
| Volatility | 17.0% | 23.0% | IDEV | Spread of weekly returns, annualized. Lower is steadier. |
| Downside deviation | 12.1% | 16.0% | IDEV | Like volatility, counting only weeks below the Treasury bill rate. |
| Max drawdown | −34.0% | −40.2% | IDEV | Deepest fall from a high to the low after it. |
| Upside capture | 96.5% | 101.0% | Share of its benchmark's rise caught in the weeks it rose. | |
| Downside capture | 97.4% | 100.5% | Share of its benchmark's fall taken in the weeks it fell. Lower is better. | |
| Beta | 1.00 | 1.01 | Not an edge | How far it moves for each 1% its benchmark moves. |
| R squared | 0.96 | 1.00 | Not an edge | Share of its weekly moves its benchmark explains. |
| Risk-adjusted | ||||
| Sharpe | 0.44 | 0.37 | IDEV | Return above Treasury bills per unit of volatility. |
| Sortino | 0.61 | 0.53 | IDEV | Return above Treasury bills per unit of downside deviation. |
| Treynor | 0.075 | 0.106 | Return above Treasury bills per unit of beta. | |
| Calmar | 0.26 | 0.22 | IDEV | Annualized return divided by the max drawdown. |
| Against the benchmark | ||||
| Benchmark | ACWX | VTWO | The ETF each fund is measured against. | |
| Alpha | +0.5% a year | −0.1% a year | Not significant | Yearly return beyond what its beta to the benchmark predicts. |
| Alpha t-stat | 0.51 | −0.36 | Not an edge | How sure the alpha is. Below 2, it could be chance. |
| Alpha range | −1.6% to +2.6% | −0.6% to +0.4% | Includes zero | The 95% range for the yearly alpha. |
| Information ratio | 0.15 | −0.02 | Return against its benchmark per unit of tracking error. | |
| Tracking error | 3.3% | 1.0% | Not an edge | How far weekly returns stray from the benchmark, annualized. |
Computed by ETFIQ from Tiingo daily prices and ETFIQ's distribution records, 499 weekly returns. Cash rate: the 13-week Treasury bill.
What they share
By the books each fund has filed, IDEV and IWM hold 2% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.
half
2% in common
Only in one fund ↓
Side by side
IDEV and IWM on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
IDEV and IWM do different jobs. What does each one do in a portfolio?
- What each follows. IDEV follows MSCI World ex USA Investable Market Index and IWM follows Russell 2000 Index.
- Holdings in common. 2% of the weight is in the same securities (holdings dated Oct 27, 2026).
- Cost. IDEV charges 0.04% of assets a year and IWM 0.19%, a gap of 0.15 points.
Data as of Oct 28, 2026.
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IDEV
IDEV tracks the MSCI International Developed Markets. Over the year to Oct 28, 2026 it returned +13.4% with distributions reinvested, against +14.3% for its benchmark, the MSCI ACWI ex USA Index. The prospectus expense ratio is 0.04% a year. By its holdings published by its issuer for Oct 27, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 2,317 positions, with the top ten at 10.9%. It sat 4.4% below its high of Aug 25, 2026 on Oct 28, 2026.
IWM
IWM tracks the Russell 2000. Over the year to Oct 28, 2026 it returned +14.1% with distributions reinvested, against +14.3% for its benchmark, the Russell 2000 Index. The prospectus expense ratio is 0.19% a year. By its holdings published by its issuer for Oct 27, 2026, 0% of the fund by weight is stocks the S&P 500 also holds, across 1,977 positions, with the top ten at 3.3%. It sat 7.6% below its high of Aug 14, 2026 on Oct 28, 2026.
Questions people ask
- Which returned more over the last year, IDEV or IWM?
- In the year to Oct 28, 2026, with distributions reinvested, IDEV returned +13.4% and IWM +14.1%.
- Which is cheaper, IDEV or IWM?
- IDEV is cheaper, by 0.15 percentage points a year. That is about $15 on $10,000 held for a year. Fees come from each fund's prospectus.
Links are sources, not endorsements. A comparison is not a recommendation.
How this is computed
Overlap adds up the smaller of the two weights for each security both funds hold.
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ETFIQ, IDEV against IWM, data as of Oct 28, 2026. https://etfiq.com/compare/any/idev-vs-iwm
ETFIQ. (Oct 28, 2026). IDEV against IWM. Retrieved from https://etfiq.com/compare/any/idev-vs-iwm
[IDEV against IWM (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/idev-vs-iwm)
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