USIAX vs. PRTBX

Last updated Jun 24, 2026

USIAX (UBS Ultra Short Income Fund) and PRTBX (Permanent Portfolio Short-Term Treasury Portfolio) are both Ultrashort Bond funds. A 0.51 correlation means they provide meaningful diversification when combined. USIAX charges 0.35%/yr vs 0.65%/yr for PRTBX.

Performance

USIAX vs. PRTBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in UBS Ultra Short Income Fund (USIAX) and Permanent Portfolio Short-Term Treasury Portfolio (PRTBX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

USIAX

• 1D: 0.00%
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

PRTBX

• 1D: -0.02%
• 1M: 0.14%
• YTD: 0.76%
• 6M: 0.85%
• 1Y: 2.85%
• 3Y*: 3.83%
• 5Y*: 1.99%
• 10Y*: 1.25%

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

USIAX vs. PRTBX - Yearly Performance Comparison

	2026 (YTD)
USIAX UBS Ultra Short Income Fund	0.22%
PRTBX Permanent Portfolio Short-Term Treasury Portfolio	0.05%

Correlation

The correlation between USIAX and PRTBX is 0.51, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (All Time) Calculated using the full available price history since May 28, 2026	0.51

Return for Risk

USIAX vs. PRTBX — Risk / Return Rank

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

USIAX

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

PRTBX

PRTBX Risk / Return Rank: 99
PRTBX Sharpe Ratio Rank: 99
PRTBX Sortino Ratio Rank: 99
PRTBX Omega Ratio Rank: 98
PRTBX Calmar Ratio Rank: 98
PRTBX 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.

USIAX vs. PRTBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for UBS Ultra Short Income Fund (USIAX) and Permanent Portfolio Short-Term Treasury Portfolio (PRTBX). 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.

	USIAX	PRTBX	Difference
Sharpe ratio: Return per unit of total volatility	—	4.41	—
Sortino ratio: Return per unit of downside risk	—	7.92	—
Omega ratio: Gain probability vs. loss probability	—	2.16	—
Calmar ratio: Return relative to maximum drawdown	—	9.28	—
Martin ratio: Return relative to average drawdown	—	44.99	—

Drawdowns

USIAX vs. PRTBX - Drawdown Comparison

The maximum USIAX drawdown since its inception was -0.10%, smaller than the maximum PRTBX drawdown of -5.13%. Use the drawdown chart below to compare losses from any high point for USIAX and PRTBX.

Drawdown Indicators

	USIAX	PRTBX	Difference
Max Drawdown Largest peak-to-trough decline	-0.10%	-5.13%	+5.03%
Max Drawdown (1Y) Largest decline over 1 year	—	-0.32%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-0.44%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-3.66%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-4.36%	—
Current Drawdown Current decline from peak	-0.10%	-0.12%	+0.02%
Average Drawdown Average peak-to-trough decline	-0.02%	-0.96%	+0.94%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.07%	—

Volatility

Volatility by Period

	USIAX	PRTBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.22%	—
Volatility (6M) Calculated over the trailing 6-month period	—	0.43%	—
Volatility (1Y) Calculated over the trailing 1-year period	1.33%	0.67%	+0.66%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.33%	1.21%	+0.12%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.33%	0.87%	+0.46%

USIAX vs. PRTBX - Expense Ratio Comparison

USIAX has a 0.35% expense ratio, which is lower than PRTBX's 0.65% expense ratio.

Dividends

USIAX vs. PRTBX - Dividend Comparison

USIAX's dividend yield for the trailing twelve months is around 0.32%, less than PRTBX's 3.36% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018
PRTBX Permanent Portfolio Short-Term Treasury Portfolio	3.36%	3.39%	2.69%	1.79%	0.00%	0.00%	0.21%	1.65%	0.83%
USIAX UBS Ultra Short Income Fund	0.32%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both USIAX and PRTBX in my portfolio?

USIAX and PRTBX have a correlation of 0.51, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.