SPMBvsIBMTETF Comparison
ETF 1
SPMB
State Street State Street SPDR Portfolio Mortgage Backed Bond ETF
This fund is part of
MBS & ABS
+0.31%
VS
State Street State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) belongs to the MBS & ABS segment. iShares iBonds Dec 2031 Term Muni Bond ETF (IBMT) is part of the Municipal Bonds segment. SPMB's top 3 sector exposures are Industrials, Finance and Government Agencies. In contrast, IBMT's top sector exposures are Municipal and Non-Corporate. SPMB is less expensive with a Total Expense Ratio (TER) of 0.04%, versus 0.1% for IBMT. SPMB is down -0.34% year-to-date (YTD) with +$618M in YTD flows. IBMT performs better with -0.13% YTD performance, and +$155M in YTD flows. Run a side-by-side ETF comparison of SPMB and IBMT 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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SPMB vs IBMT performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 10/30/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | SPMB IBMT | +3.07%+3.28% | -0.44%+0.46% | -0.34%-0.13% | +0.34%+0.50% | +20.05%n/a | +0.78%n/a |
| Flows | SPMB IBMT | +$29M+$43M | +$143M+$79M | +$618M+$155M | +$804M+$177M | +$2.48B- | +$3.53B- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SPMB IBMT | +6.02%+4.13% | +4.72%+2.70% | +5.73%n/a | +6.80%n/a |
| Max drawdown | SPMB IBMT | -4.41%-4.21% | -5.57%-5.71% | -5.57%n/a | -17.04%n/a |
| Max drawdown duration | SPMB IBMT | 66d78d | 243d246d | 243dn/a | 1436dn/a |
Trading data
SPMB | IBMT | |
Last sale 10/30/2026 at 1:30 PM | $21.70 | $25.47 |
| Previous close 10/29/2026 | $21.61 | $25.39 |
| Consolidated volume 10/29/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
Replication quality
Data as of October 30, 2026
1-year trailing difference
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SPMB | IBMT | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 10/30/2026 at 1:30 PM
Live
Closed
SPMB | IBMT | |
|---|---|---|
| Last price | $21.70 | $25.47 |
| 1D performance | +0.42% | +0.32% |
| AuM | $7.03 B | $208.28 M |
| E/R | 0.04% | 0.1% |
Characteristics
SPMB | IBMT | |
|---|---|---|
| Management strategy | Passive | Passive |
| Provider | State Street Investment Management | iShares |
| Benchmark | Bloomberg U.S. MBS Index | S&P AMT-Free Municipal Series Callable-Adjusted 2031 Index |
| N° of holdings | 568 | 403 |
| Asset class | Bonds | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | January 15, 2009 | March 25, 2025 |
| ESG | No | No |
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Exposure
Countries
SPMB
USA
32.36%
Other
67.64%
IBMT
USA
33.08%
Other
66.92%
Sectors
SPMB
Industrials
32.01%
Other
67.99%
IBMT
Municipal
31.42%
Other
68.58%
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Diversification
SPMB
Total weight of top 15 holdings out of 15
9.74%
IBMT
Total weight of top 15 holdings out of 15
8.1%
Top 15 holdings
Data as of September 30, 2026
SPMB
US01F0526A56
1.42%
US3142J6C840
1.13%
FN MA4547, 2% 1feb2052, USD (ABS)
0.75%
US3142J6DY61
0.74%
US3142J6BK85
0.73%
FR SD8212, 2.5% 1may2052, USD (ABS)
0.58%
US01F0506A92
0.57%
US3132DWMY65
0.53%
G2 MB0424, 5.5% 20jun2055, USD (ABS)
0.52%
US3618N56H72
0.50%
FN MA4701, 4.5% 1aug2052, USD (ABS)
0.49%
FN FA0608, 5.5% 1feb2055, USD (ABS)
0.47%
FN MA4465, 2% 1nov2051, USD (ABS)
0.45%
FR SD8193, 2% 1feb2052, USD (ABS)
0.43%
FN FS2040, 2% 1feb2052, USD (ABS)
0.42%
IBMT
BlackRock Liquidity MuniCash
1.66%
New Jersey, 4% 1jun2031, USD
0.70%
US646067KD94
0.63%
US64966SYJ94
0.62%
US373385QZ98
0.61%
Aquarion Water Authority, 5.25% 1feb2031, USD (2026)
0.49%
Los Angeles Unified School District, 5% 1jul2031, USD (2024)
0.44%
US97705MZ406
0.44%
North Texas Tollway Authority, 0% 1jan2031, USD (2008D, 8308D)
0.44%
US606092QD91
0.40%
US61334PFN87
0.38%
University of California, 5% 15may2035, USD (2021)
0.33%
US7417018C37
0.33%
Honolulu, 5% 1mar2031, USD (2021E)
0.32%
US650028F323
0.32%
Frequently asked questions about SPMB and IBMT
How have the SPMB and IBMT ETFs performed in 2026?
As of October 30, 2026, SPMB is down -0.34% year-to-date (YTD), while IBMT has lost -0.13%. That puts IBMT better performer ahead so far this year.
Which ETF is attracting more investor money: SPMB or IBMT?
Year-to-date, the SPMB ETF saw +$618M in flows, compared to +$155M for IBMT.
Which ETF is more volatile: SPMB or IBMT?
Over the past year, SPMB had a volatility of 4.72%, while IBMT experienced 2.7%.
Which ETF is bigger: SPMB or IBMT?
As of October 30, 2026, SPMB holds $7.03 B in assets under management (AUM), while IBMT manages $208.28 M.
What sectors do the SPMB and IBMT ETFs invest in?
SPMB leans toward sectors like Industrials. Meanwhile, IBMT focuses on Municipal.
What are the top holdings of the SPMB ETF and IBMT ETF?
SPMB top holdings include US01F0526A56, US3142J6C840 and FN MA4547, 2% 1feb2052, USD (ABS). IBMT holds in its top three: BlackRock Liquidity MuniCash, New Jersey, 4% 1jun2031, USD and US646067KD94.
Which ETF is more diversified: SPMB or IBMT?
SPMB holds 2752 securities with 9.74% of its assets in the top 15. IBMT has 1484 securities and a top 15 weight of 8.1%.
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