MBBvsBKMSETF Comparison
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iShares MBS ETF (MBB) belongs to the MBS & ABS segment. BNY Mellon Municipal Short Duration ETF (BKMS) is part of the Municipal Bonds segment. MBB's top 3 sector exposures are Industrials, Non-Corporate and Finance. In contrast, BKMS's top sector exposures are Municipal. MBB is less expensive with a Total Expense Ratio (TER) of 0.04%, versus 0.35% for BKMS. Run a side-by-side ETF comparison of MBB and BKMS 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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MBB vs BKMS performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/11/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | MBB BKMS | -1.48%-0.47% | -2.24%-0.16% | -1.34%n/a | -0.12%n/a | +13.76%n/a | -0.62%n/a |
| Flows | MBB BKMS | +$655M+$7M | +$892M+$982K | +$1.52B- | -$888M- | +$12.43B- | +$17.94B- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | MBB BKMS | +4.76%+0.93% | +4.22%n/a | +5.85%n/a | +6.60%n/a |
| Max drawdown | MBB BKMS | -2.79%-0.61% | -3.37%n/a | -5.44%n/a | -17.29%n/a |
| Max drawdown duration | MBB BKMS | 74d16d | 194dn/a | 75dn/a | 1492dn/a |
Trading data
MBB | BKMS | |
Last sale 9/11/2026 at 1:30 PM | $91.38 | $25.28 |
| Previous close 09/10/2026 | $91.48 | $25.26 |
| Consolidated volume 09/10/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of August 31, 2026
1-year trailing difference
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BKMS
is actively managed and doesn’t replicate an indexMBB | BKMS | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/11/2026 at 1:30 PM
Live
Closed
MBB | BKMS | |
|---|---|---|
| Last price | $91.38 | $25.28 |
| 1D performance | -0.11% | +0.08% |
| AuM | $38.92 B | $432.80 M |
| E/R | 0.04% | 0.35% |
Characteristics
MBB | BKMS | |
|---|---|---|
| Management strategy | Passive | Active |
| Provider | iShares | BNY Mellon |
| Benchmark | Bloomberg U.S. MBS Index | - |
| N° of holdings | 1231 | 43 |
| Asset class | Bonds | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | March 13, 2007 | January 9, 2026 |
| ESG | No | No |
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Exposure
Countries
MBB
USA
29.07%
Other
70.93%
BKMS
USA
24.63%
Other
75.37%
Sectors
MBB
Industrials
20.93%
Non-Corporate
7.91%
Other
71.16%
BKMS
Municipal
24.63%
Other
75.37%
Diversification
MBB
Total weight of top 15 holdings out of 15
16.01%
BKMS
Total weight of top 15 holdings out of 15
20.82%
Top 15 holdings
Data as of July 31, 2026
MBB
BlackRock Cash Funds - Institutional
7.91%
FR SD8146, 2% 1may2051, USD (ABS)
1.00%
US21H0526861
0.98%
US01F0506844
0.66%
US21H0506806
0.58%
US01F0526800
0.56%
G2 MB0025, 5% 20nov2054, USD (ABS)
0.53%
G2 MA7648, 2% 20oct2051, USD (ABS)
0.52%
US36179WTX64
0.51%
FN MA4492, 2% 1dec2051, USD (ABS)
0.50%
FR SD8140, 2% 1apr2051, USD (ABS)
0.48%
US21H0426872
0.46%
US21H0606895
0.45%
US36179WJR07
0.44%
FN MA4465, 2% 1nov2051, USD (ABS)
0.43%
BKMS
US762196EY54
2.33%
Tarrant Cultural Education Facilities Finance Corp., 5% 15nov2064, USD (2025B)
1.85%
Southeast Energy Authority, 5% 1may2053, USD (2022)
1.77%
New York Dormitory Authority, 5% 1jul2048, USD
1.48%
Connecticut Health and Educational Facilities Authority, 5% 1jul2064, USD (2025B-1)
1.35%
US71783TAC45
1.28%
City of New York, 5% 1aug2030, USD (2026)
1.26%
Private Colleges and Universities Authority, 5% 1sep2029, USD (2025A)
1.25%
US64972JTX62
1.23%
Virginia Transportation Board, 5% 15may2031, USD (2017A)
1.20%
US899576HE55
1.19%
New York Housing Finance Agency, 3.6% 1nov2064, USD (2025)
1.17%
US593344CB87
1.17%
Rural Water Financing Agency, 2.75% 1may2028, USD (2025A)
1.16%
US803770XC53
1.12%
Frequently asked questions about MBB and BKMS
Which ETF is bigger: MBB or BKMS?
As of September 11, 2026, MBB holds $38.92 B in assets under management (AUM), while BKMS manages $432.80 M.
What sectors do the MBB and BKMS ETFs invest in?
MBB leans toward sectors like Industrials and Non-Corporate. Meanwhile, BKMS focuses on Municipal.
What are the top holdings of the MBB ETF and BKMS ETF?
MBB top holdings include BlackRock Cash Funds - Institutional, FR SD8146, 2% 1may2051, USD (ABS) and US21H0526861. BKMS holds in its top three: US762196EY54, Tarrant Cultural Education Facilities Finance Corp., 5% 15nov2064, USD (2025B) and Southeast Energy Authority, 5% 1may2053, USD (2022).
Which ETF is more diversified: MBB or BKMS?
MBB holds 9388 securities with 16.01% of its assets in the top 15. BKMS has 249 securities and a top 15 weight of 20.82%.
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