SPMBvsFUSIETF Comparison
ETF 1
SPMB
State Street State Street SPDR Portfolio Mortgage Backed Bond ETF
This fund is part of
MBS & ABS
-0.05%
VS
ETF 2
FUSI
American Century Multisector Floating Income ETF
This fund is part of
US Aggregate Bonds
-0.07%
State Street State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) belongs to the MBS & ABS segment. American Century Multisector Floating Income ETF (FUSI) is part of the US Aggregate Bonds segment. SPMB's top 3 sector exposures are Industrials, Finance and Government Agencies. In contrast, FUSI's top sector exposures are Industrials and Sovereign. SPMB is less expensive with a Total Expense Ratio (TER) of 0.04%, versus 0.19% for FUSI. SPMB is down -1.42% year-to-date (YTD) with +$655M in YTD flows. FUSI performs better with 3.28% YTD performance, and +$18M in YTD flows. Run a side-by-side ETF comparison of SPMB and FUSI 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 FUSI performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/15/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | SPMB FUSI | -1.55%+0.28% | -2.41%+1.10% | -1.42%+3.28% | -0.55%+4.73% | +13.73%+17.97% | -0.90%n/a |
| Flows | SPMB FUSI | +$53M+$15M | +$236M+$18M | +$655M+$18M | +$936M-$10M | +$2.59B+$20M | +$3.74B- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | SPMB FUSI | +4.82%+0.24% | +4.25%+0.29% | +5.94%+0.41% | +6.72%n/a |
| Max drawdown | SPMB FUSI | -2.90%n/a | -3.51%-0.08% | -5.40%-0.32% | -17.32%n/a |
| Max drawdown duration | SPMB FUSI | 78dn/a | 198d4d | 318d19d | 1491dn/a |
Trading data
SPMB | FUSI | |
Last sale 9/16/2026 at 1:30 PM | $21.52 | $50.42 |
| Previous close 09/15/2026 | $21.55 | $50.45 |
| Consolidated volume 09/15/2026 | ||
| 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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FUSI
is actively managed and doesn’t replicate an indexSPMB | FUSI | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/16/2026 at 1:30 PM
Live
Closed
SPMB | FUSI | |
|---|---|---|
| Last price | $21.52 | $50.42 |
| 1D performance | -0.14% | -0.07% |
| AuM | $7.02 B | $40.32 M |
| E/R | 0.04% | 0.19% |
Characteristics
SPMB | FUSI | |
|---|---|---|
| Management strategy | Passive | Active |
| Provider | State Street Investment Management | American Century Investments |
| Benchmark | Bloomberg U.S. MBS Index | - |
| N° of holdings | 554 | 17 |
| Asset class | Bonds | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | January 15, 2009 | March 16, 2023 |
| ESG | No | No |
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Exposure
Countries
SPMB
USA
32.64%
Other
67.36%
FUSI
USA
33.18%
Other
66.82%
Sectors
SPMB
Industrials
32.31%
Other
67.69%
FUSI
Industrials
23.26%
Sovereign
9.92%
Other
66.82%
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Diversification
SPMB
Total weight of top 15 holdings out of 15
9.28%
FUSI
Total weight of top 15 holdings out of 15
45.28%
Top 15 holdings
Data as of July 31, 2026
SPMB
US3142J6C840
1.16%
US01F0526800
0.86%
FN MA4547, 2% 1feb2052, USD (ABS)
0.78%
US3142J6BK85
0.76%
US01F0506844
0.70%
FR SD8212, 2.5% 1may2052, USD (ABS)
0.60%
US3132DWMY65
0.55%
G2 MB0424, 5.5% 20jun2055, USD (ABS)
0.54%
FN MA4701, 4.5% 1aug2052, USD (ABS)
0.51%
US01F0606834
0.50%
US21H0506806
0.49%
FN FA0608, 5.5% 1feb2055, USD (ABS)
0.49%
FN MA4465, 2% 1nov2051, USD (ABS)
0.47%
FN FS2040, 2% 1feb2052, USD (ABS)
0.44%
US3132DWKV45
0.43%
FUSI
USA, Notes FRN 31jan2027, USD (AX-2027)
9.92%
LCM 35A, FRN 15oct2034, USD (ABS, BR)
4.41%
Atlas Senior Loan Fund 2021-17A, FRN 20oct2034, USD (ABS, B1)
3.31%
US3136BV2T46
2.98%
US12659VAA89
2.51%
US48251FAJ03
2.25%
US929342AA13
2.23%
BX Commercial Mortgage Trust 2026-CSMO, FRN 17feb2043, USD (ABS, A)
2.21%
Brant Point CLO 2023-1A, FRN 26jul2038, USD (ABS, BR)
2.21%
US559916AG67
2.21%
TPG Real Estate Finance Issuer 2025-FL6, FRN 18sep2042, USD (ABS, A)
2.21%
US05594VAC63
2.21%
US55819GBC24
2.21%
US883932AS42
2.21%
US87168YAS90
2.21%
Frequently asked questions about SPMB and FUSI
How have the SPMB and FUSI ETFs performed in 2026?
As of September 15, 2026, SPMB is down -1.42% year-to-date (YTD), while FUSI has returned 3.28%. That puts FUSI better performer ahead so far this year.
Which ETF is attracting more investor money: SPMB or FUSI?
Year-to-date, the SPMB ETF saw +$655M in flows, compared to +$18M for FUSI.
Which ETF is more volatile: SPMB or FUSI?
Over the past year, SPMB had a volatility of 4.25%, while FUSI experienced 0.29%.
Which ETF is bigger: SPMB or FUSI?
As of September 15, 2026, SPMB holds $7.02 B in assets under management (AUM), while FUSI manages $40.32 M.
What sectors do the SPMB and FUSI ETFs invest in?
SPMB leans toward sectors like Industrials. Meanwhile, FUSI focuses on Industrials and Sovereign.
What are the top holdings of the SPMB ETF and FUSI ETF?
SPMB top holdings include US3142J6C840, US01F0526800 and FN MA4547, 2% 1feb2052, USD (ABS). FUSI holds in its top three: USA, Notes FRN 31jan2027, USD (AX-2027), LCM 35A, FRN 15oct2034, USD (ABS, BR) and Atlas Senior Loan Fund 2021-17A, FRN 20oct2034, USD (ABS, B1).
Which ETF is more diversified: SPMB or FUSI?
SPMB holds 2713 securities with 9.28% of its assets in the top 15. FUSI has 61 securities and a top 15 weight of 45.28%.
Latest news about SPMB & FUSI
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