JMSTvsMBBETF Comparison
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JPMorgan Ultra-Short Municipal Income ETF (JMST) belongs to the Municipal Bonds segment. iShares MBS ETF (MBB) is part of the MBS & ABS segment. JMST's top 2 sector exposures are Municipal and Sovereign. In contrast, MBB's top sector exposures are Industrials, Non-Corporate and Finance. JMST is more expensive with a Total Expense Ratio (TER) of 0.18%, versus 0.04% for MBB. JMST is up 1.36% year-to-date (YTD) with +$1.07B in YTD flows. MBB performs worse with -1.15% YTD performance, and +$1.52B in YTD flows. Run a side-by-side ETF comparison of JMST 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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JMST vs MBB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/10/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | JMST MBB | -0.02%-1.16% | +0.31%-1.51% | +1.36%-1.15% | +2.03%+0.30% | +9.77%+13.98% | +12.17%-0.40% |
| Flows | JMST MBB | +$297M+$655M | +$933M+$892M | +$1.07B+$1.52B | +$2.82B-$888M | +$4.88B+$12.43B | +$5.32B+$17.94B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | JMST MBB | +0.40%+4.89% | +0.34%+4.22% | +0.41%+5.85% | +0.43%+6.60% |
| Max drawdown | JMST MBB | -0.16%-2.60% | -0.16%-3.19% | -0.46%-5.44% | -0.93%-17.29% |
| Max drawdown duration | JMST MBB | 10d73d | 10d193d | 29d75d | 435d1492d |
Trading data
JMST | MBB | |
Last sale 9/10/2026 at 1:30 PM | $91.48 | |
| Previous close 09/10/2026 | $92.22 | |
| 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 indexJMST | 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 9/10/2026 at 1:30 PM
Live
Closed
JMST | MBB | |
|---|---|---|
| Last price | – | $91.48 |
| 1D performance | – | -0.80% |
| AuM | $7.43 B | $39.00 B |
| E/R | 0.18% | 0.04% |
Characteristics
JMST | MBB | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | J.P. Morgan Asset Management | iShares |
| Benchmark | - | Bloomberg U.S. MBS Index |
| N° of holdings | 523 | 1231 |
| Asset class | - | Bonds |
| Trailing 12m distribution yield | Join | Join |
| Inception date | October 16, 2018 | March 13, 2007 |
| ESG | No | No |
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Exposure
Countries
JMST
USA
27.09%
Other
72.91%
MBB
USA
29.07%
Other
70.93%
Sectors
JMST
Municipal
24.94%
Other
75.06%
MBB
Industrials
20.93%
Non-Corporate
7.91%
Other
71.16%
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Diversification
JMST
Total weight of top 15 holdings out of 15
12.23%
MBB
Total weight of top 15 holdings out of 15
16.01%
Top 15 holdings
Data as of July 31, 2026
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%
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%
Frequently asked questions about JMST and MBB
How have the JMST and MBB ETFs performed in 2026?
As of September 10, 2026, JMST is up 1.36% year-to-date (YTD), while MBB has lost -1.15%. That puts JMST better performer ahead so far this year.
Which ETF is attracting more investor money: JMST or MBB?
Year-to-date, the JMST ETF saw +$1.07B in flows, compared to +$1.52B for MBB.
Which ETF is more volatile: JMST or MBB?
Over the past year, JMST had a volatility of 0.34%, while MBB experienced 4.22%.
Which ETF is bigger: JMST or MBB?
As of September 10, 2026, JMST holds $7.43 B in assets under management (AUM), while MBB manages $39.00 B.
What sectors do the JMST and MBB ETFs invest in?
JMST leans toward sectors like Municipal. Meanwhile, MBB focuses on Industrials and Non-Corporate.
What are the top holdings of the JMST ETF and MBB ETF?
JMST top holdings include USA, Bills 0% 11aug2026, USD (119D), US64972GZB30 and US93974FDR10. MBB holds in its top three: BlackRock Cash Funds - Institutional, FR SD8146, 2% 1may2051, USD (ABS) and US21H0526861.
Which ETF is more diversified: JMST or MBB?
JMST holds 1623 securities with 12.23% of its assets in the top 15. MBB has 9388 securities and a top 15 weight of 16.01%.
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Latest news about JMST & MBB
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