MUSI vs. FUSI

Last updated Jun 24, 2026

MUSI (American Century Multisector Income ETF) and FUSI (American Century Multisector Floating Income ETF) are both exchange-traded funds - MUSI is a Multisector Bonds fund actively managed by American Century, while FUSI is a Ultrashort Bond fund actively managed by American Century. Both are actively managed. Over the past 3 years, MUSI returned 6.54%/yr vs 5.91%/yr for FUSI. At a 0.26 correlation, their price movements are largely independent. MUSI charges 0.36%/yr vs 0.28%/yr for FUSI.

Performance

MUSI vs. FUSI - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Multisector Income ETF (MUSI) and American Century Multisector Floating Income ETF (FUSI). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MUSI achieves a 0.85% return, which is significantly lower than FUSI's 2.74% return.

MUSI

• 1D: 0.09%
• 1M: 0.59%
• YTD: 0.85%
• 6M: 1.07%
• 1Y: 5.33%
• 3Y*: 6.54%
• 5Y*: —
• 10Y*: —

FUSI

• 1D: 0.00%
• 1M: 0.55%
• YTD: 2.74%
• 6M: 2.81%
• 1Y: 5.44%
• 3Y*: 5.91%
• 5Y*: —
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

MUSI vs. FUSI - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
MUSI American Century Multisector Income ETF	0.85%	8.32%	5.14%	5.15%
FUSI American Century Multisector Floating Income ETF	2.74%	4.85%	6.19%	5.83%

Correlation

The correlation between MUSI and FUSI is 0.40, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.40
Correlation (3Y) Calculated over the trailing 3-year period	0.28
Correlation (All Time) Calculated using the full available price history since Mar 16, 2023	0.26

The correlation between MUSI and FUSI shifts across timeframes, from 0.26 (all time) to 0.40 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

MUSI vs. FUSI — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

MUSI

MUSI Risk / Return Rank: 47
MUSI Sharpe Ratio Rank: 49
MUSI Sortino Ratio Rank: 53
MUSI Omega Ratio Rank: 50
MUSI Calmar Ratio Rank: 42
MUSI Martin Ratio Rank: 43

FUSI

FUSI Risk / Return Rank: 98
FUSI Sharpe Ratio Rank: 98
FUSI Sortino Ratio Rank: 98
FUSI Omega Ratio Rank: 99
FUSI Calmar Ratio Rank: 98
FUSI Martin Ratio Rank: 99

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

MUSI vs. FUSI - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Multisector Income ETF (MUSI) and American Century Multisector Floating Income ETF (FUSI). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	MUSI	FUSI	Difference
Sharpe ratio: Return per unit of total volatility	1.59	5.71	-4.12
Sortino ratio: Return per unit of downside risk	2.38	9.02	-6.64
Omega ratio: Gain probability vs. loss probability	1.29	2.78	-1.48
Calmar ratio: Return relative to maximum drawdown	1.92	12.28	-10.35
Martin ratio: Return relative to average drawdown	6.63	89.86	-83.24

MUSI vs. FUSI - Sharpe Ratio Comparison

The current MUSI Sharpe Ratio is 1.59, which is lower than the FUSI Sharpe Ratio of 5.71. The chart below compares the historical Sharpe Ratios of MUSI and FUSI, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

MUSI vs. FUSI - Drawdown Comparison

The maximum MUSI drawdown since its inception was -13.91%, which is greater than FUSI's maximum drawdown of -0.70%. Use the drawdown chart below to compare losses from any high point for MUSI and FUSI.

Drawdown Indicators

	MUSI	FUSI	Difference
Max Drawdown Largest peak-to-trough decline	-13.91%	-0.70%	-13.21%
Max Drawdown (1Y) Largest decline over 1 year	-2.78%	-0.45%	-2.33%
Max Drawdown (3Y) Largest decline over 3 years	-4.16%	-0.70%	-3.46%
Current Drawdown Current decline from peak	-0.89%	-0.03%	-0.86%
Average Drawdown Average peak-to-trough decline	-4.18%	-0.04%	-4.14%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.81%	0.06%	+0.75%

Volatility

MUSI vs. FUSI - Volatility Comparison

American Century Multisector Income ETF (MUSI) has a higher volatility of 1.05% compared to American Century Multisector Floating Income ETF (FUSI) at 0.36%. This indicates that MUSI's price experiences larger fluctuations and is considered to be riskier than FUSI based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MUSI	FUSI	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.05%	0.36%	+0.69%
Volatility (6M) Calculated over the trailing 6-month period	2.71%	0.67%	+2.04%
Volatility (1Y) Calculated over the trailing 1-year period	3.37%	0.96%	+2.41%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.84%	1.10%	+3.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.84%	1.10%	+3.74%

MUSI vs. FUSI - Expense Ratio Comparison

MUSI has a 0.36% expense ratio, which is higher than FUSI's 0.28% expense ratio.

Dividends

MUSI vs. FUSI - Dividend Comparison

MUSI's dividend yield for the trailing twelve months is around 5.53%, more than FUSI's 5.24% yield.

Position	TTM	2025	2024	2023	2022	2021
FUSI American Century Multisector Floating Income ETF	5.24%	5.28%	5.98%	4.97%	0.00%	0.00%
MUSI American Century Multisector Income ETF	5.53%	5.74%	6.00%	5.20%	4.02%	1.62%

Frequently Asked Questions

Can I hold both MUSI and FUSI in my portfolio?

MUSI and FUSI have a correlation of 0.40, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MUSI or FUSI?

MUSI has higher volatility (1.05%) compared to FUSI (0.36%). In terms of maximum drawdown, MUSI dropped -13.91% vs FUSI's -0.70%.

Which ETF is better, MUSI or FUSI?

On 3-year performance, MUSI leads with 6.54% vs 5.91% for FUSI. On fees, FUSI is cheaper at 0.28% per year. On volatility, FUSI has been the lower-risk option at 0.36%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, MUSI or FUSI?

Over the 3-year period, MUSI has performed better with a 6.54% return vs 5.91%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, MUSI or FUSI?

FUSI is cheaper with a 0.28% expense ratio, compared with 0.36% for MUSI.

Which ETF pays a higher dividend yield, MUSI or FUSI?

MUSI has the higher dividend yield at 5.53%, compared with 5.24% for FUSI.

What is the main difference between MUSI and FUSI?

MUSI is categorized as Multisector Bonds, while FUSI is Ultrashort Bond. Their fees differ too: 0.36% for MUSI and 0.28% for FUSI.

Which has better risk-adjusted returns?

FUSI currently has the higher Sharpe Ratio (5.71 vs 1.59), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.