Data as of Oct 28, 2026.
IWM vs MUB: Differences, Returns & Fees
Over the year to Oct 28, 2026, IWM returned +14.1% to MUB's −0.4%; 0% of their weight is in the same names.
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Net assets on Oct 27, 2026: $75.5bn for iShares Russell 2000 ETF and $54.1bn for iShares National Muni Bond ETF.
Pair scorecard
MUB costs 0.14 points a year less; their one-year returns differ by 14.5 points; IWM is 1.4 times larger.
| Measure | IWM | MUB |
|---|---|---|
| Return | ||
| Total return, 1 year | +14.1% | −0.4% |
| Drawdown | ||
| Below its high | 7.6%, high on Aug 14, 2026 | |
| Benchmark | ||
| What it tracks | Russell 2000 Index | ICE AMT-Free US National Municipal Index |
| Cost and size | ||
| Expense ratio | 0.19% | 0.05% |
| Net assets, as of Oct 27, 2026 | $75.5bn | $54.1bn |
| Holdings | ||
| Holdings in common | 0% | |
| In the S&P 500, by weight | 0% | |
| Top ten holdings, share of the fund | 3.3% | |
Holdings in common uses holdings dated Oct 27, 2026. Method
What they share
By the books each fund has filed, IWM and MUB hold 0% of their money in the same securities at the same weight. Holdings dated Oct 27, 2026.
half
0% in common
Only in one fund ↓
Side by side
IWM and MUB on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
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.
MUB
MUB tracks an index of National Muni Bond. Over the year to Oct 28, 2026 it returned −0.4% with distributions reinvested. The prospectus expense ratio is 0.05% a year.
Questions people ask
- Which returned more over the last year, IWM or MUB?
- In the year to Oct 28, 2026, with distributions reinvested, IWM returned +14.1% and MUB −0.4%.
- Which is cheaper, IWM or MUB?
- MUB is cheaper, by 0.14 percentage points a year. That is about $14 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, IWM against MUB, data as of Oct 28, 2026. https://etfiq.com/compare/any/iwm-vs-mub
ETFIQ. (Oct 28, 2026). IWM against MUB. Retrieved from https://etfiq.com/compare/any/iwm-vs-mub
[IWM against MUB (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/iwm-vs-mub)
Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.