FUSIvsAMUNETF Comparison
ETF 1
FUSI
American Century Multisector Floating Income ETF
This fund is part of
US Aggregate Bonds
-0.33%
VS
American Century Multisector Floating Income ETF (FUSI) belongs to the US Aggregate Bonds segment. abrdn Ultra Short Municipal Income Active ETF (AMUN) is part of the Municipal Bonds segment. FUSI's top 2 sector exposures are Industrials and Sovereign. In contrast, AMUN's top sector exposures are Municipal and Non-Corporate. FUSI is less expensive with a Total Expense Ratio (TER) of 0.19%, versus 0.74% for AMUN. FUSI is up 3.32% year-to-date (YTD) with +$18M in YTD flows. AMUN performs worse with 1.88% YTD performance, and +$25M in YTD flows. Run a side-by-side ETF comparison of FUSI and AMUN 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 AMUN 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 AMUN | +0.31%+0.12% | +1.05%+0.50% | +3.32%+1.88% | +4.73%n/a | +17.99%n/a | n/an/a |
| Flows | FUSI AMUN | +$15M+$651K | +$18M+$2M | +$18M+$25M | -$10M- | +$20M- | -- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | FUSI AMUN | +0.23%+0.35% | +0.29%n/a | +0.41%n/a | n/an/a |
| Max drawdown | FUSI AMUN | -0.02%-0.08% | -0.08%n/a | -0.32%n/a | n/an/a |
| Max drawdown duration | FUSI AMUN | 3d10d | 4dn/a | 19dn/a | n/an/a |
Trading data
FUSI | AMUN | |
Last sale 9/18/2026 at 1:30 PM | $50.46 | $26.06 |
| Previous close 09/17/2026 | $50.43 | $26.05 |
| Consolidated volume 09/17/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
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Main metrics
Last update 9/18/2026 at 1:30 PM
Live
Closed
FUSI | AMUN | |
|---|---|---|
| Last price | $50.46 | $26.06 |
| 1D performance | +0.05% | +0.04% |
| AuM | $40.33 M | $55.04 M |
| E/R | 0.19% | 0.74% |
Characteristics
FUSI | AMUN | |
|---|---|---|
| Management strategy | Active | Active |
| Provider | American Century Investments | abrdn |
| Benchmark | - | - |
| N° of holdings | 17 | 17 |
| Asset class | - | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | March 16, 2023 | October 17, 2025 |
| ESG | No | No |
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Exposure
Countries
FUSI
USA
33.18%
Other
66.82%
AMUN
USA
33.29%
Other
66.71%
Sectors
FUSI
Industrials
23.26%
Sovereign
9.92%
Other
66.82%
AMUN
Municipal
33.11%
Other
66.89%
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Diversification
FUSI
Total weight of top 15 holdings out of 15
45.28%
AMUN
Total weight of top 15 holdings out of 15
53.8%
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%
AMUN
Massachusetts Port Authority, 5% 1jul2043, USD (2016-B)
4.70%
Tennessee Energy Acquisition Corp., 5.625% 1sep2026, USD
4.14%
US46640KYU23
4.13%
US546598AA16
3.95%
US230589AB90
3.81%
Chandler Industrial Development Authority, 5% 1sep2052, USD (2022-2)
3.79%
Newark, 4.25% 5may2027, USD (2026)
3.77%
US478232SD45
3.77%
US34074EAF60
3.76%
US88035TZV50
3.76%
US7386297S79
3.75%
Mississippi Business Finance Corp., FRN 1nov2032, USD (2007A)
3.08%
US414008CX87
2.77%
PEFA Inc., 5% 1sep2049, USD (2019)
2.35%
US06964KAB26
2.26%
Frequently asked questions about FUSI and AMUN
How have the FUSI and AMUN ETFs performed in 2026?
As of September 18, 2026, FUSI is up 3.32% year-to-date (YTD), while AMUN has returned 1.88%. That puts FUSI better performer ahead so far this year.
Which ETF is attracting more investor money: FUSI or AMUN?
Year-to-date, the FUSI ETF saw +$18M in flows, compared to +$25M for AMUN.
Which ETF is bigger: FUSI or AMUN?
As of September 18, 2026, FUSI holds $40.33 M in assets under management (AUM), while AMUN manages $55.04 M.
What sectors do the FUSI and AMUN ETFs invest in?
FUSI leans toward sectors like Industrials and Sovereign. Meanwhile, AMUN focuses on Municipal.
What are the top holdings of the FUSI ETF and AMUN 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). AMUN holds in its top three: Massachusetts Port Authority, 5% 1jul2043, USD (2016-B), Tennessee Energy Acquisition Corp., 5.625% 1sep2026, USD and US46640KYU23.
Which ETF is more diversified: FUSI or AMUN?
FUSI holds 61 securities with 45.28% of its assets in the top 15. AMUN has 63 securities and a top 15 weight of 53.8%.
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