Data as of Oct 28, 2026.
MUB vs XBI: Differences, Returns & Fees
Over the year to Oct 28, 2026, MUB returned −0.4% to XBI's +41.2%, and MUB charges 0.05% to XBI's 0.35%.
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Net assets on Oct 27, 2026: $54.1bn for iShares National Muni Bond ETF and $10.3bn for State Street SPDR S&P Biotech ETF.
Pair scorecard
MUB costs 0.30 points a year less; their one-year returns differ by 41.6 points; MUB is 5.3 times larger.
| Measure | MUB | XBI |
|---|---|---|
| Return | ||
| Total return, 1 year | −0.4% | +41.2% |
| Drawdown | ||
| Below its all-time high | 8.9%, high on Feb 8, 2021 | |
| Benchmark | ||
| What it tracks | ICE AMT-Free US National Municipal Index | Biotech |
| Cost and size | ||
| Expense ratio | 0.05% | 0.35% |
| Net assets, as of Oct 27, 2026 | $54.1bn | $10.3bn |
| Active share vs the S&P 500 | 98% | |
| Holdings | ||
| Holdings in common | 0% | |
| In the S&P 500, by weight | 13% | |
| Top ten holdings, share of the fund | 18% | |
Holdings in common uses holdings dated Oct 27, 2026. Method
What they share
By the books each fund has filed, MUB and XBI 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
MUB and XBI on the fields both publish, as of Oct 28, 2026. Source: ETFIQ.
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.
XBI
By weight, 13% of XBI's portfolio is stocks that are also in the S&P 500; its active share against the S&P 500 is 98%. The top ten holdings are 18% of the fund across 165 positions, as published by its issuer for Oct 27, 2026. Over the year to Oct 28, 2026 the fund returned +41.2% with distributions reinvested. It sits 8.9% below its all-time high of Feb 8, 2021.
Questions people ask
- Are MUB and XBI in the same category?
- MUB is a bond ETF and XBI is a thematic ETF, so they do different jobs. The table compares what both publish: return, cost and holdings.
- Which returned more over the last year, MUB or XBI?
- In the year to Oct 28, 2026, with distributions reinvested, MUB returned −0.4% and XBI +41.2%.
- Which is cheaper, MUB or XBI?
- MUB is cheaper, by 0.30 percentage points a year. That is about $30 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, MUB against XBI, data as of Oct 28, 2026. https://etfiq.com/compare/any/mub-vs-xbi
ETFIQ. (Oct 28, 2026). MUB against XBI. Retrieved from https://etfiq.com/compare/any/mub-vs-xbi
[MUB against XBI (ETFIQ, Oct 28, 2026)](https://etfiq.com/compare/any/mub-vs-xbi)
Free to use with attribution for data ETFIQ computes; issuer data stays under its owner's terms.