FUSIvsSPMBETF Comparison
ETF 1
FUSI
American Century Multisector Floating Income ETF
This fund is part of
US Aggregate Bonds
-0.33%
VS
ETF 2
SPMB
State Street State Street SPDR Portfolio Mortgage Backed Bond ETF
This fund is part of
MBS & ABS
-0.45%
American Century Multisector Floating Income ETF (FUSI) belongs to the US Aggregate Bonds segment. State Street State Street SPDR Portfolio Mortgage Backed Bond ETF (SPMB) is part of the MBS & ABS segment. FUSI's top 2 sector exposures are Industrials and Sovereign. In contrast, SPMB's top sector exposures are Industrials, Finance and Government Agencies. FUSI is more expensive with a Total Expense Ratio (TER) of 0.19%, versus 0.04% for SPMB. FUSI is up 3.32% year-to-date (YTD) with +$18M in YTD flows. SPMB performs worse with -1.37% YTD performance, and +$666M in YTD flows. Run a side-by-side ETF comparison of FUSI and SPMB 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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FUSI vs SPMB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 09/18/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | FUSI SPMB | +0.31%-1.59% | +1.05%-2.29% | +3.32%-1.37% | +4.73%+0.15% | +17.99%+13.53% | n/a-0.75% |
| Flows | FUSI SPMB | +$15M+$57M | +$18M+$227M | +$18M+$666M | -$10M+$918M | +$20M+$2.59B | -+$3.75B |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | FUSI SPMB | +0.23%+4.95% | +0.29%+4.31% | +0.41%+5.95% | n/a+6.73% |
| Max drawdown | FUSI SPMB | -0.02%-3.00% | -0.08%-3.61% | -0.32%-5.40% | n/a-17.24% |
| Max drawdown duration | FUSI SPMB | 3d81d | 4d201d | 19d318d | n/a1486d |
Trading data
FUSI | SPMB | |
Last sale 9/18/2026 at 1:30 PM | $50.46 | $21.57 |
| Previous close 09/17/2026 | $50.43 | $21.66 |
| Consolidated volume 09/17/2026 | ||
| 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 indexFUSI | SPMB | |
|---|---|---|
| Tracking error | ||
| Tracking difference | ||
| 1 year cumulative return difference | ||
| Best | ||
| Worst | ||
| Daily return difference | ||
| Average | ||
| Worst | ||
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Main metrics
Last update 9/18/2026 at 1:30 PM
Live
Closed
FUSI | SPMB | |
|---|---|---|
| Last price | $50.46 | $21.57 |
| 1D performance | +0.05% | -0.42% |
| AuM | $40.33 M | $7.04 B |
| E/R | 0.19% | 0.04% |
Characteristics
FUSI | SPMB | |
|---|---|---|
| Management strategy | Active | Passive |
| Provider | American Century Investments | State Street Investment Management |
| Benchmark | - | Bloomberg U.S. MBS Index |
| N° of holdings | 17 | 554 |
| Asset class | - | Bonds |
| Trailing 12m distribution yield | Join | Join |
| Inception date | March 16, 2023 | January 15, 2009 |
| ESG | No | No |
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Exposure
Countries
FUSI
USA
33.18%
Other
66.82%
SPMB
USA
32.64%
Other
67.36%
Sectors
FUSI
Industrials
23.26%
Sovereign
9.92%
Other
66.82%
SPMB
Industrials
32.31%
Other
67.69%
Diversification
FUSI
Total weight of top 15 holdings out of 15
45.28%
SPMB
Total weight of top 15 holdings out of 15
9.28%
Top 15 holdings
Data as of July 31, 2026
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%
US559916AG67
2.21%
Brant Point CLO 2023-1A, FRN 26jul2038, USD (ABS, BR)
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%
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%
Frequently asked questions about FUSI and SPMB
How have the FUSI and SPMB ETFs performed in 2026?
As of September 18, 2026, FUSI is up 3.32% year-to-date (YTD), while SPMB has lost -1.37%. That puts FUSI better performer ahead so far this year.
Which ETF is attracting more investor money: FUSI or SPMB?
Year-to-date, the FUSI ETF saw +$18M in flows, compared to +$666M for SPMB.
Which ETF is more volatile: FUSI or SPMB?
Over the past year, FUSI had a volatility of 0.29%, while SPMB experienced 4.31%.
Which ETF is bigger: FUSI or SPMB?
As of September 18, 2026, FUSI holds $40.33 M in assets under management (AUM), while SPMB manages $7.04 B.
What sectors do the FUSI and SPMB ETFs invest in?
FUSI leans toward sectors like Industrials and Sovereign. Meanwhile, SPMB focuses on Industrials.
What are the top holdings of the FUSI ETF and SPMB ETF?
FUSI top holdings include 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). SPMB holds in its top three: US3142J6C840, US01F0526800 and FN MA4547, 2% 1feb2052, USD (ABS).
Which ETF is more diversified: FUSI or SPMB?
FUSI holds 61 securities with 45.28% of its assets in the top 15. SPMB has 2713 securities and a top 15 weight of 9.28%.
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