BKMSvsMBBETF Comparison
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BNY Mellon Municipal Short Duration ETF (BKMS) belongs to the Municipal Bonds segment. iShares MBS ETF (MBB) is part of the MBS & ABS segment. BKMS's top 1 sector exposures are Municipal. In contrast, MBB's top sector exposures are Industrials, Non-Corporate and Finance. BKMS is more expensive with a Total Expense Ratio (TER) of 0.35%, versus 0.04% for MBB. Run a side-by-side ETF comparison of BKMS 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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BKMS vs MBB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/19/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | BKMS MBB | +0.08%-0.97% | -0.46%-2.36% | n/a-2.04% | n/a-1.78% | n/a+19.02% | n/a-0.58% |
| Flows | BKMS MBB | +$24M-$3.31B | +$28M-$2.66B | --$1.79B | --$4.91B | -+$8.55B | -+$13.89B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | BKMS MBB | +1.79%+5.74% | n/a+4.62% | n/a+5.69% | n/a+6.66% |
| Max drawdown | BKMS MBB | -1.90%-4.27% | n/a-5.38% | n/a-5.38% | n/a-16.94% |
| Max drawdown duration | BKMS MBB | 54d55d | n/a232d | n/a232d | n/a1405d |
Trading data
BKMS | MBB | |
Last sale 10/19/2026 at 1:30 PM | $25.17 | $90.22 |
| Previous close 10/19/2026 | $25.17 | $90.52 |
| Consolidated volume 10/19/2026 | ||
| 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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BKMS
is actively managed and doesn’t replicate an indexBKMS | 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 10/19/2026 at 1:30 PM
Live
Closed
BKMS | MBB | |
|---|---|---|
| Last price | $25.17 | $90.22 |
| 1D performance | +0.00% | -0.33% |
| AuM | $455.25 M | $35.17 B |
| E/R | 0.35% | 0.04% |
Characteristics
BKMS | MBB | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | BNY Mellon | iShares |
| Benchmark | - | Bloomberg U.S. MBS Index |
| N° of holdings | 43 | 1237 |
| Asset class | - | Bonds |
| Trailing 12m distribution yield | Join | Join |
| Inception date | January 9, 2026 | March 13, 2007 |
| ESG | No | No |
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Exposure
Countries
BKMS
USA
24.68%
Other
75.32%
MBB
USA
28.44%
Other
71.56%
Sectors
BKMS
Municipal
24.68%
Other
75.32%
MBB
Industrials
20.61%
Non-Corporate
7.6%
Other
71.79%
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Diversification
BKMS
Total weight of top 15 holdings out of 15
20.5%
MBB
Total weight of top 15 holdings out of 15
16.82%
Top 15 holdings
Data as of August 31, 2026
BKMS
US762196EY54
2.31%
Tarrant Cultural Education Facilities Finance Corp., 5% 15nov2064, USD (2025B)
1.85%
Southeast Energy Authority, 5% 1may2053, USD (2022)
1.76%
New York Dormitory Authority, 5% 1jul2048, USD
1.46%
Connecticut Health and Educational Facilities Authority, 5% 1jul2064, USD (2025B-1)
1.34%
US71783TAC45
1.27%
City of New York, 5% 1aug2030, USD (2026)
1.25%
Private Colleges and Universities Authority, 5% 1sep2029, USD (2025A)
1.24%
Virginia Transportation Board, 5% 15may2031, USD (2017A)
1.19%
US899576HE55
1.18%
US593344CB87
1.17%
New York Housing Finance Agency, 3.6% 1nov2064, USD (2025)
1.17%
Rural Water Financing Agency, 2.75% 1may2028, USD (2025A)
1.15%
US803770XC53
1.11%
US45470YGD76
1.04%
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 BKMS and MBB
Which ETF is bigger: BKMS or MBB?
As of October 19, 2026, BKMS holds $455.25 M in assets under management (AUM), while MBB manages $35.17 B.
What sectors do the BKMS and MBB ETFs invest in?
BKMS leans toward sectors like Municipal. Meanwhile, MBB focuses on Industrials and Non-Corporate.
What are the top holdings of the BKMS ETF and MBB ETF?
BKMS top holdings include US762196EY54, Tarrant Cultural Education Facilities Finance Corp., 5% 15nov2064, USD (2025B) and Southeast Energy Authority, 5% 1may2053, USD (2022). MBB holds in its top three: BlackRock Cash Funds - Institutional, US01F0526982 and US21H0526945.
Which ETF is more diversified: BKMS or MBB?
BKMS holds 253 securities with 20.5% 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 BKMS & MBB
The Weekly ETF Market Monitor (September 28-October 2, 2026)
October 2, 2026
MBB
NYSE x ETF Central ETF Education Series
March 5, 2024
MBB
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