SPMBvsTAXFETF 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. American Century Diversified Municipal Bond ETF (TAXF) is part of the Municipal Bonds segment. SPMB's top 3 sector exposures are Industrials, Finance and Government Agencies. In contrast, TAXF's top sector exposures are Municipal. SPMB is less expensive with a Total Expense Ratio (TER) of 0.04%, versus 0.25% for TAXF. SPMB is down -0.34% year-to-date (YTD) with +$618M in YTD flows. TAXF performs better with -0.04% YTD performance, and +$230M in YTD flows. Run a side-by-side ETF comparison of SPMB and TAXF 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 TAXF 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 TAXF | +3.07%+3.68% | -0.44%-0.98% | -0.34%-0.04% | +0.34%+0.49% | +20.05%+15.60% | +0.78%+3.97% |
| Flows | SPMB TAXF | +$29M+$79M | +$143M+$92M | +$618M+$230M | +$804M+$260M | +$2.48B+$425M | +$3.53B+$616M |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SPMB TAXF | +6.02%+5.66% | +4.72%+3.57% | +5.73%+3.94% | +6.80%+3.90% |
| Max drawdown | SPMB TAXF | -4.41%-6.08% | -5.57%-6.91% | -5.57%-6.91% | -17.04%-13.26% |
| Max drawdown duration | SPMB TAXF | 66d78d | 243d117d | 243d117d | 1436d1001d |
Trading data
SPMB | TAXF | |
Last sale 10/30/2026 at 1:30 PM | $21.70 | $48.87 |
| Previous close 10/29/2026 | $21.61 | $48.62 |
| 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 September 30, 2026
1-year trailing difference
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TAXF
is actively managed and doesn’t replicate an indexSPMB | TAXF | |
|---|---|---|
| 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 | TAXF | |
|---|---|---|
| Last price | $21.70 | $48.87 |
| 1D performance | +0.42% | +0.51% |
| AuM | $7.03 B | $762.73 M |
| E/R | 0.04% | 0.25% |
Characteristics
SPMB | TAXF | |
|---|---|---|
| Management strategy | Passive | Active |
| Provider | State Street Investment Management | American Century Investments |
| Benchmark | Bloomberg U.S. MBS Index | - |
| N° of holdings | 568 | 234 |
| Asset class | Bonds | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | January 15, 2009 | September 10, 2018 |
| ESG | No | No |
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Exposure
Countries
SPMB
USA
32.36%
Other
67.64%
TAXF
USA
33.76%
Other
66.24%
Sectors
SPMB
Industrials
32.01%
Other
67.99%
TAXF
Municipal
33.76%
Other
66.24%
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Diversification
SPMB
Total weight of top 15 holdings out of 15
9.74%
TAXF
Total weight of top 15 holdings out of 15
8.81%
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%
TAXF
Build NYC Resource Corp., 5.25% 15dec2031, USD (2026B-3)
0.88%
US74442PN840
0.88%
US734733CX49
0.74%
Arkansas Development Finance Authority, 4% 1sep2046, USD (2026A)
0.72%
US60637GRY79
0.65%
Puerto Rico Sales Tax Financing Corp., 4.329% 1jul2040, USD
0.56%
US646080ZU81
0.55%
Southeast Alabama Gas Supply District, FRN 1aug2054, USD (A)
0.54%
Black Belt Energy Gas District, 5% 1oct2035, USD (2025)
0.53%
US452252RA98
0.53%
US01065CAM55
0.47%
US88256RBE53
0.45%
US681725PH47
0.45%
Orlando Utilities Commission, 5% 1oct2048, USD (2023A)
0.44%
US292723AY90
0.42%
Frequently asked questions about SPMB and TAXF
