MUSIvsTMBETF Comparison
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American Century Multisector Income ETF (MUSI) and Thornburg Multi Sector Bond ETF (TMB) belong to the same industry segment: Intl Aggregate Bonds. MUSI's top 3 sector exposures are Finance, Sovereign and Industrials. In contrast, TMB's top sector exposures are Sovereign, Finance and Industrials. MUSI is less expensive with a Total Expense Ratio (TER) of 0.38%, versus 0.55% for TMB. MUSI is up 0.66% year-to-date (YTD) with +$79M in YTD flows. TMB performs better with 0.86% YTD performance, and +$185M in YTD flows. Run a side-by-side ETF comparison of MUSI and TMB 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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MUSI vs TMB performance and flow charts
Performance
Cumulative Flows
Historic performance and flows
Data as of 08/28/2026
| 1M | 3M | YTD | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|---|---|
| Perf. | MUSI TMB | +0.15%+0.09% | -0.08%+0.12% | +0.66%+0.86% | +2.69%+2.77% | +21.22%n/a | +10.58%n/a |
| Flows | MUSI TMB | +$19M+$21M | +$46M+$75M | +$79M+$185M | +$94M+$186M | +$104M- | +$198M- |
Volatility and drawdown
| 3M | 1Y | 3Y | 5Y | ||
|---|---|---|---|---|---|
| Volatility | MUSI TMB | +3.16%+2.57% | +3.00%+2.47% | +3.92%n/a | +4.20%n/a |
| Max drawdown | MUSI TMB | -1.32%-0.97% | -2.65%-1.82% | -3.35%n/a | -13.69%n/a |
| Max drawdown duration | MUSI TMB | 60d60d | 180d180d | 74dn/a | 1051dn/a |
Trading data
MUSI | TMB | |
Last sale 8/28/2026 at 1:30 PM | $43.11 | $25.15 |
| Previous close 08/27/2026 | $43.26 | $25.31 |
| Consolidated volume 08/27/2026 | ||
| Average volume 30 days | ||
| Average discount or premium 30 days | ||
| Average Bid/Ask spread 30 days |
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Main metrics
Last update 8/28/2026 at 1:30 PM
Live
Closed
MUSI | TMB | |
|---|---|---|
| Last price | $43.11 | $25.15 |
| 1D performance | -0.35% | -0.63% |
| AuM | $262.98 M | $257.06 M |
| E/R | 0.38% | 0.55% |
Characteristics
MUSI | TMB | |
|---|---|---|
| Management strategy | Active | Active |
| Provider | American Century Investments | Thornburg |
| Benchmark | - | - |
| N° of holdings | 273 | 369 |
| Asset class | - | - |
| Trailing 12m distribution yield | Join | Join |
| Inception date | July 1, 2021 | February 5, 2025 |
| ESG | No | No |
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Exposure
Countries
MUSI
USA
44.35%
Other
55.65%
TMB
USA
60.67%
Other
39.33%
Sectors
MUSI
Finance
17.68%
Sovereign
11.68%
Other
70.64%
TMB
Sovereign
20.69%
Finance
12.73%
Industrials
8.03%
Other
58.56%
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Diversification
MUSI
Total weight of top 15 holdings out of 15
15.87%
TMB
Total weight of top 15 holdings out of 15
24.04%
Top 15 holdings
Data as of July 31, 2026
MUSI
USA, Notes 4.125% 31may2031, USD (Z-2031)
3.65%
USA, Bonds 4.75% 15feb2056, USD
2.71%
FR SD8474, 5% 1nov2054, USD (ABS)
1.86%
USA, Notes 4.25% 31may2033, USD (L-2033)
1.24%
USA, Notes 4.125% 30jun2028, USD (BD-2028)
1.13%
USA, Notes 4.125% 30jun2031, USD (AA-2031)
1.06%
USA, Notes 4.625% 15sep2026, USD (AS-2026)
0.64%
USA, Notes 4.375% 31jul2031, USD (AB-2031)
0.54%
Bank of Montreal, 7.7% 26may2084, USD
0.53%
Ladder Capital Finance Corp., 7% 15jul2031, USD
0.49%
Build NYC Resource Corp., 7% 15dec2030, USD (2026C)
0.44%
BNP Paribas, 8.5% perp., USD
0.42%
UBS Group, 9.25% perp., USD
0.39%
Amazon.com, 4.55% 13mar2033, USD
0.38%
US729906AH00
0.38%
TMB
USA, Notes 4% 15nov2035, USD (F-2035)
9.88%
USA, Notes 4.25% 30jun2033, USD (M-2033)
3.84%
USA, Bonds 3% 15nov2044, USD
1.48%
USA, Notes 3.75% 31aug2031, USD (P-2031)
1.48%
FN MA5497, 5.5% 1oct2054, USD (ABS)
1.04%
US31418D3H34
1.01%
US912803HV84
0.80%
USA, Notes 4.375% 15may2036, USD (C-2036)
0.77%
FR SD8178, 2.5% 1nov2051, USD (ABS)
0.72%
USA, TIPS 0.125% 15feb2051, USD
0.64%
USA, STRIPS 0% 15may2042, USD (10957D)
0.56%
Thornburg Capital Management Fund
0.53%
US3140XRWW19
0.45%
US142921AG08
0.43%
US3136BX3N21
0.42%
Frequently asked questions about MUSI and TMB
How have the MUSI and TMB ETFs performed in 2026?
As of August 28, 2026, MUSI is up 0.66% year-to-date (YTD), while TMB has returned 0.86%. That puts TMB better performer ahead so far this year.
Which ETF is attracting more investor money: MUSI or TMB?
Year-to-date, the MUSI ETF saw +$79M in flows, compared to +$185M for TMB.
Which ETF is more volatile: MUSI or TMB?
Over the past year, MUSI had a volatility of 3%, while TMB experienced 2.47%.
Which ETF is bigger: MUSI or TMB?
As of August 28, 2026, MUSI holds $262.98 M in assets under management (AUM), while TMB manages $257.06 M.
What sectors do the MUSI and TMB ETFs invest in?
MUSI leans toward sectors like Finance and Sovereign. Meanwhile, TMB focuses on Sovereign, Finance and Industrials.
What are the top holdings of the MUSI ETF and TMB ETF?
MUSI top holdings include USA, Notes 4.125% 31may2031, USD (Z-2031), USA, Bonds 4.75% 15feb2056, USD and FR SD8474, 5% 1nov2054, USD (ABS). TMB holds in its top three: USA, Notes 4% 15nov2035, USD (F-2035), USA, Notes 4.25% 30jun2033, USD (M-2033) and USA, Bonds 3% 15nov2044, USD.
Which ETF is more diversified: MUSI or TMB?
MUSI holds 398 securities with 15.87% of its assets in the top 15. TMB has 604 securities and a top 15 weight of 24.04%.
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