MUIIX vs. CULAX

Last updated Jun 17, 2026

MUIIX (Morgan Stanley Institutional Fund Trust Ultra-Short Income Portfolio) and CULAX (Calvert Ultra-Short Duration Income Fund) are both Ultrashort Bond funds. Over the past 5 years, MUIIX returned 3.25%/yr vs 3.38%/yr for CULAX. At a 0.26 correlation, their price movements are largely independent. MUIIX charges 0.35%/yr vs 0.72%/yr for CULAX.

Performance

MUIIX vs. CULAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Morgan Stanley Institutional Fund Trust Ultra-Short Income Portfolio (MUIIX) and Calvert Ultra-Short Duration Income Fund (CULAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MUIIX achieves a 1.57% return, which is significantly higher than CULAX's 1.34% return.

MUIIX

• 1D: 0.00%
• 1M: 0.32%
• YTD: 1.57%
• 6M: 1.91%
• 1Y: 4.22%
• 3Y*: 4.38%
• 5Y*: 3.25%
• 10Y*: —

CULAX

• 1D: 0.00%
• 1M: 0.31%
• YTD: 1.34%
• 6M: 1.77%
• 1Y: 4.10%
• 3Y*: 5.11%
• 5Y*: 3.38%
• 10Y*: 2.46%

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

MUIIX vs. CULAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
MUIIX Morgan Stanley Institutional Fund Trust Ultra-Short Income Portfolio	1.57%	4.47%	4.94%	4.17%	1.10%	0.10%	0.49%
CULAX Calvert Ultra-Short Duration Income Fund	1.34%	4.55%	5.69%	6.07%	-0.56%	0.43%	4.90%

Correlation

The correlation between MUIIX and CULAX is 0.53, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.53
Correlation (3Y) Calculated over the trailing 3-year period	0.34
Correlation (5Y) Calculated over the trailing 5-year period	0.27
Correlation (All Time) Calculated using the full available price history since Apr 7, 2020	0.26

Over the past year, MUIIX and CULAX have become more correlated (0.53) than their long-term average of 0.26, meaning their price movements have been converging.

Return for Risk

MUIIX vs. CULAX — Risk / Return Rank

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

MUIIX

MUIIX Risk / Return Rank: 99
MUIIX Sharpe Ratio Rank: 98
MUIIX Sortino Ratio Rank: 100
MUIIX Omega Ratio Rank: 100
MUIIX Calmar Ratio Rank: 100
MUIIX Martin Ratio Rank: 100

CULAX

CULAX Risk / Return Rank: 99
CULAX Sharpe Ratio Rank: 96
CULAX Sortino Ratio Rank: 100
CULAX Omega Ratio Rank: 99
CULAX Calmar Ratio Rank: 99
CULAX 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.

MUIIX vs. CULAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Morgan Stanley Institutional Fund Trust Ultra-Short Income Portfolio (MUIIX) and Calvert Ultra-Short Duration Income Fund (CULAX). 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.

	MUIIX	CULAX	Difference
Sharpe ratio: Return per unit of total volatility	3.56	3.17	+0.39
Sortino ratio: Return per unit of downside risk	18.56	11.56	+7.00
Omega ratio: Gain probability vs. loss probability	9.28	4.33	+4.95
Calmar ratio: Return relative to maximum drawdown	42.37	13.63	+28.74
Martin ratio: Return relative to average drawdown	120.57	56.15	+64.42

MUIIX vs. CULAX - Sharpe Ratio Comparison

The current MUIIX Sharpe Ratio is 3.56, which is comparable to the CULAX Sharpe Ratio of 3.17. The chart below compares the historical Sharpe Ratios of MUIIX and CULAX, 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

MUIIX vs. CULAX - Drawdown Comparison

The maximum MUIIX drawdown since its inception was -1.20%, smaller than the maximum CULAX drawdown of -7.40%. Use the drawdown chart below to compare losses from any high point for MUIIX and CULAX.

Drawdown Indicators

	MUIIX	CULAX	Difference
Max Drawdown Largest peak-to-trough decline	-1.20%	-7.40%	+6.20%
Max Drawdown (1Y) Largest decline over 1 year	-0.10%	-0.30%	+0.20%
Max Drawdown (3Y) Largest decline over 3 years	-1.20%	-0.30%	-0.90%
Max Drawdown (5Y) Largest decline over 5 years	-1.20%	-2.19%	+0.99%
Max Drawdown (10Y) Largest decline over 10 years	—	-7.40%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-0.06%	-0.21%	+0.15%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.04%	0.07%	-0.03%

Volatility

MUIIX vs. CULAX - Volatility Comparison

Morgan Stanley Institutional Fund Trust Ultra-Short Income Portfolio (MUIIX) has a higher volatility of 0.40% compared to Calvert Ultra-Short Duration Income Fund (CULAX) at 0.31%. This indicates that MUIIX's price experiences larger fluctuations and is considered to be riskier than CULAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MUIIX	CULAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.40%	0.31%	+0.09%
Volatility (6M) Calculated over the trailing 6-month period	0.81%	0.84%	-0.03%
Volatility (1Y) Calculated over the trailing 1-year period	1.19%	1.30%	-0.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.59%	1.35%	+0.24%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.44%	1.42%	+0.02%

MUIIX vs. CULAX - Expense Ratio Comparison

MUIIX has a 0.35% expense ratio, which is lower than CULAX's 0.72% expense ratio.

Dividends

MUIIX vs. CULAX - Dividend Comparison

MUIIX's dividend yield for the trailing twelve months is around 4.03%, more than CULAX's 3.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CULAX Calvert Ultra-Short Duration Income Fund	3.91%	4.13%	4.90%	4.52%	1.47%	0.64%	1.25%	2.44%	2.10%	1.13%	1.10%	0.66%
MUIIX Morgan Stanley Institutional Fund Trust Ultra-Short Income Portfolio	4.03%	4.36%	4.81%	3.88%	1.20%	0.10%	0.39%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both MUIIX and CULAX in my portfolio?

MUIIX and CULAX have a correlation of 0.53, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MUIIX or CULAX?

MUIIX has higher volatility (0.40%) compared to CULAX (0.31%). In terms of maximum drawdown, MUIIX dropped -1.20% vs CULAX's -7.40%.

Which has better risk-adjusted returns?

MUIIX currently has the higher Sharpe Ratio (3.56 vs 3.17), 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.