WMSBvsMBBETF Comparison
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Weitz Multisector Bond ETF (WMSB) belongs to the Intl Aggregate Bonds segment. iShares MBS ETF (MBB) is part of the MBS & ABS segment. WMSB's top 3 sector exposures are Industrials, Finance and Consumer Services. In contrast, MBB's top sector exposures are Industrials, Non-Corporate and Finance. WMSB is more expensive with a Total Expense Ratio (TER) of 0.89%, versus 0.04% for MBB. WMSB is up 0.9% year-to-date (YTD) with +$20M in YTD flows. MBB performs worse with -0.99% YTD performance, and -$1.79B in YTD flows. Run a side-by-side ETF comparison of WMSB and MBB below, and assess how they stack up in performance, liquidity, risk, exposure, holdings, and more, helping you select the best ETF for your investments.
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WMSB vs MBB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/28/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | WMSB MBB | +1.30%+2.12% | -0.88%-1.37% | +0.90%-0.99% | n/a-1.04% | n/a+19.36% | n/a+0.44% |
| Flows | WMSB MBB | --$1.87B | --$2.66B | +$20M-$1.79B | --$4.82B | -+$7.95B | -+$13.59B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | WMSB MBB | +3.83%+5.94% | n/a+4.71% | n/a+5.65% | n/a+6.68% |
| Max drawdown | WMSB MBB | -2.89%-4.27% | n/a-5.38% | n/a-5.38% | n/a-16.94% |
| Max drawdown duration | WMSB MBB | 64d64d | n/a241d | n/a241d | n/a1405d |
Trading data
WMSB | MBB | |
Last sale 10/29/2026 at 1:30 PM | $24.41 | $91.68 |
| Previous close 10/28/2026 | $24.51 | $91.41 |
| Consolidated volume 10/28/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of September 30, 2026
1-year trailing difference
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WMSB
is actively managed and doesn’t replicate an indexWMSB | MBB | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 10/29/2026 at 1:30 PM
Live
Closed
WMSB | MBB | |
|---|---|---|
| Last price | $24.41 | $91.68 |
| 1D performance | -0.44% | +0.30% |
| AuM | $26.95 M | $35.55 B |
| E/R | 0.89% | 0.04% |
Characteristics
WMSB | MBB | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | Weitz Investment Management | iShares |
| Benchmark | - | Bloomberg U.S. MBS Index |
| N° of holdings | 45 | 1237 |
| Asset class | - | Bonds |
| Trailing 12m distribution yield | Join | Join |
| Inception date | November 4, 2025 | March 13, 2007 |
| ESG | No | No |
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Exposure
Countries
WMSB
USA
30.17%
Other
69.83%
MBB
USA
28.44%
Other
71.56%
Sectors
WMSB
Industrials
15.84%
Other
84.16%
MBB
Industrials
20.61%
Non-Corporate
7.6%
Other
71.79%
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Diversification
WMSB
Total weight of top 15 holdings out of 15
55.97%
MBB
Total weight of top 15 holdings out of 15
16.82%
Top 15 holdings
Data as of August 31, 2026
WMSB
FN MA5734, 5% 1jun2055, USD (ABS)
8.56%
US3140W6MZ25
8.30%
US3142J6DY61
8.18%
US3140W3KL26
5.46%
US3132DWPG23
3.62%
US81750BAG23
3.52%
US3133KPE612
3.14%
US74345HAL50
2.69%
Canada Cartage, 9.75% 8may2031, USD
2.23%
US3133KPUH99
1.92%
US00489QAB86
1.81%
US629174AC77
1.78%
FN MA5469, 5% 1sep2054, USD (ABS)
1.65%
FN MA5294, 5% 1mar2054, USD (ABS)
1.64%
Six Flags Entertainment, 8.625% 15jan2032, USD
1.47%
MBB
BlackRock Cash Funds - Institutional
7.60%
US01F0526982
1.26%
US21H0526945
1.05%
FR SD8146, 2% 1may2051, USD (ABS)
0.98%
US01F0506927
0.87%
US21H0606978
0.63%
G2 MB0025, 5% 20nov2054, USD (ABS)
0.55%
US21H0506988
0.55%
G2 MA7648, 2% 20oct2051, USD (ABS)
0.51%
US36179WTX64
0.50%
FN MA4492, 2% 1dec2051, USD (ABS)
0.49%
US36179WJR07
0.48%
US21H0426955
0.48%
FR SD8140, 2% 1apr2051, USD (ABS)
0.47%
FN MA4465, 2% 1nov2051, USD (ABS)
0.42%
Frequently asked questions about WMSB and MBB
How have the WMSB and MBB ETFs performed in 2026?
As of October 28, 2026, WMSB is up 0.9% year-to-date (YTD), while MBB has lost -0.99%. That puts WMSB better performer ahead so far this year.
Which ETF is attracting more investor money: WMSB or MBB?
Year-to-date, the WMSB ETF saw +$20M in flows, compared to -$1.79B for MBB.
Which ETF is bigger: WMSB or MBB?
As of October 28, 2026, WMSB holds $26.95 M in assets under management (AUM), while MBB manages $35.55 B.
What sectors do the WMSB and MBB ETFs invest in?
WMSB leans toward sectors like Industrials. Meanwhile, MBB focuses on Industrials and Non-Corporate.
What are the top holdings of the WMSB ETF and MBB ETF?
WMSB top holdings include FN MA5734, 5% 1jun2055, USD (ABS), US3140W6MZ25 and US3142J6DY61. MBB holds in its top three: BlackRock Cash Funds - Institutional, US01F0526982 and US21H0526945.
Which ETF is more diversified: WMSB or MBB?
WMSB holds 93 securities with 55.97% of its assets in the top 15. MBB has 9405 securities and a top 15 weight of 16.82%.
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Latest news about WMSB & MBB
The Weekly ETF Market Monitor (September 28-October 2, 2026)
October 2, 2026
MBB
Weitz Expands Its ETF Lineup with the Launch of the Multisector Bond ETF (WMSB)
November 8, 2025
WMSB
NYSE x ETF Central ETF Education Series
March 5, 2024
MBB
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