MBBvsJMSTETF Comparison
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iShares MBS ETF (MBB) belongs to the MBS & ABS segment. JPMorgan Ultra-Short Municipal Income ETF (JMST) is part of the Municipal Bonds segment. MBB's top 3 sector exposures are Industrials, Non-Corporate and Finance. In contrast, JMST's top sector exposures are Municipal and Sovereign. MBB is less expensive with a Total Expense Ratio (TER) of 0.04%, versus 0.18% for JMST. MBB is down -1.34% year-to-date (YTD) with +$1.52B in YTD flows. JMST performs better with 1.37% YTD performance, and +$1.07B in YTD flows. Run a side-by-side ETF comparison of MBB and JMST 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 JMST 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 JMST | -1.48%-0.02% | -2.24%+0.32% | -1.34%+1.37% | -0.12%+2.02% | +13.76%+9.78% | -0.62%+12.16% |
| Flows | MBB JMST | +$655M+$290M | +$892M+$898M | +$1.52B+$1.07B | -$888M+$2.82B | +$12.43B+$4.88B | +$17.94B+$5.31B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | MBB JMST | +4.76%+0.40% | +4.22%+0.34% | +5.85%+0.40% | +6.60%+0.43% |
| Max drawdown | MBB JMST | -2.79%-0.16% | -3.37%-0.16% | -5.44%-0.46% | -17.29%-0.93% |
| Max drawdown duration | MBB JMST | 74d11d | 194d11d | 75d29d | 1492d435d |
Trading data
MBB | JMST | |
Last sale 9/11/2026 at 1:30 PM | $91.38 | |
| Previous close 09/10/2026 | $91.48 | |
| 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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JMST
is actively managed and doesn’t replicate an indexMBB | JMST | |
|---|---|---|
| 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 | JMST | |
|---|---|---|
| Last price | $91.38 | – |
| 1D performance | -0.11% | – |
| AuM | $38.92 B | $7.43 B |
| E/R | 0.04% | 0.18% |
Characteristics
MBB | JMST | |
|---|---|---|
| Management strategy | Passive | Active |
| Provider | iShares | J.P. Morgan Asset Management |
| Benchmark | Bloomberg U.S. MBS Index | - |
| N° of holdings | 1231 | 523 |
| Asset class | Bonds | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | March 13, 2007 | October 16, 2018 |
| ESG | No | No |
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Exposure
Countries
MBB
USA
29.07%
Other
70.93%
JMST
USA
27.09%
Other
72.91%
Sectors
MBB
Industrials
20.93%
Non-Corporate
7.91%
Other
71.16%
JMST
Municipal
24.94%
Other
75.06%
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Diversification
MBB
Total weight of top 15 holdings out of 15
16.01%
JMST
Total weight of top 15 holdings out of 15
12.23%
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%
JMST
USA, Bills 0% 11aug2026, USD (119D)
2.16%
US64972GZB30
0.98%
US93974FDR10
0.85%
US01170PBW59
0.81%
US60412A2K82
0.74%
US424092HZ03
0.71%
US644894QC44
0.68%
US6492284K61
0.68%
US9788624C19
0.68%
US57421CHW73
0.68%
US650860AZ26
0.67%
US543077YT22
0.67%
US083773EE76
0.65%
US87638TEH23
0.64%
District of Columbia, FRN 1jun2051, USD (2026C)
0.64%
Frequently asked questions about MBB and JMST
How have the MBB and JMST ETFs performed in 2026?
As of September 11, 2026, MBB is down -1.34% year-to-date (YTD), while JMST has returned 1.37%. That puts JMST better performer ahead so far this year.
Which ETF is attracting more investor money: MBB or JMST?
Year-to-date, the MBB ETF saw +$1.52B in flows, compared to +$1.07B for JMST.
Which ETF is more volatile: MBB or JMST?
Over the past year, MBB had a volatility of 4.22%, while JMST experienced 0.34%.
Which ETF is bigger: MBB or JMST?
As of September 11, 2026, MBB holds $38.92 B in assets under management (AUM), while JMST manages $7.43 B.
What sectors do the MBB and JMST ETFs invest in?
MBB leans toward sectors like Industrials and Non-Corporate. Meanwhile, JMST focuses on Municipal.
What are the top holdings of the MBB ETF and JMST ETF?
MBB top holdings include BlackRock Cash Funds - Institutional, FR SD8146, 2% 1may2051, USD (ABS) and US21H0526861. JMST holds in its top three: USA, Bills 0% 11aug2026, USD (119D), US64972GZB30 and US93974FDR10.
Which ETF is more diversified: MBB or JMST?
MBB holds 9388 securities with 16.01% of its assets in the top 15. JMST has 1623 securities and a top 15 weight of 12.23%.
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Latest news about MBB & JMST
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