CBUDX vs. PRTBX

Last updated Jun 24, 2026

CBUDX (CrossingBridge Ultra-Short Duration Fund) and PRTBX (Permanent Portfolio Short-Term Treasury Portfolio) are both Ultrashort Bond funds. Over the past 3 years, CBUDX returned 5.32%/yr vs 3.83%/yr for PRTBX. At a 0.09 correlation, their price movements are largely independent. CBUDX charges 0.89%/yr vs 0.65%/yr for PRTBX.

Performance

CBUDX vs. PRTBX - Performance Comparison

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

Returns By Period

In the year-to-date period, CBUDX achieves a 1.64% return, which is significantly higher than PRTBX's 0.76% return.

CBUDX

• 1D: -0.10%
• 1M: 0.23%
• YTD: 1.64%
• 6M: 1.84%
• 1Y: 4.33%
• 3Y*: 5.32%
• 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)

CBUDX vs. PRTBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
CBUDX CrossingBridge Ultra-Short Duration Fund	1.64%	5.25%	5.83%	5.61%	2.25%	0.26%
PRTBX Permanent Portfolio Short-Term Treasury Portfolio	0.76%	4.19%	4.12%	3.79%	-2.28%	-0.45%

Correlation

The correlation between CBUDX and PRTBX is 0.11, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.11
Correlation (3Y) Calculated over the trailing 3-year period	0.09
Correlation (All Time) Calculated using the full available price history since Jun 30, 2021	0.09

Return for Risk

CBUDX vs. PRTBX — Risk / Return Rank

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

CBUDX

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

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.

CBUDX vs. PRTBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for CrossingBridge Ultra-Short Duration Fund (CBUDX) 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.

	CBUDX	PRTBX	Difference
Sharpe ratio: Return per unit of total volatility	5.21	4.41	+0.80
Sortino ratio: Return per unit of downside risk	9.62	7.92	+1.70
Omega ratio: Gain probability vs. loss probability	3.94	2.16	+1.77
Calmar ratio: Return relative to maximum drawdown	11.11	9.28	+1.83
Martin ratio: Return relative to average drawdown	74.62	44.99	+29.63

CBUDX vs. PRTBX - Sharpe Ratio Comparison

The current CBUDX Sharpe Ratio is 5.21, which is comparable to the PRTBX Sharpe Ratio of 4.41. The chart below compares the historical Sharpe Ratios of CBUDX and PRTBX, 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

CBUDX vs. PRTBX - Drawdown Comparison

The maximum CBUDX drawdown since its inception was -0.40%, smaller than the maximum PRTBX drawdown of -5.13%. Use the drawdown chart below to compare losses from any high point for CBUDX and PRTBX.

Drawdown Indicators

	CBUDX	PRTBX	Difference
Max Drawdown Largest peak-to-trough decline	-0.40%	-5.13%	+4.73%
Max Drawdown (1Y) Largest decline over 1 year	-0.40%	-0.32%	-0.08%
Max Drawdown (3Y) Largest decline over 3 years	-0.40%	-0.44%	+0.04%
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	-0.03%	-0.96%	+0.93%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.06%	0.07%	-0.01%

Volatility

CBUDX vs. PRTBX - Volatility Comparison

CrossingBridge Ultra-Short Duration Fund (CBUDX) has a higher volatility of 0.29% compared to Permanent Portfolio Short-Term Treasury Portfolio (PRTBX) at 0.22%. This indicates that CBUDX's price experiences larger fluctuations and is considered to be riskier than PRTBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CBUDX	PRTBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.29%	0.22%	+0.07%
Volatility (6M) Calculated over the trailing 6-month period	0.69%	0.43%	+0.26%
Volatility (1Y) Calculated over the trailing 1-year period	0.86%	0.67%	+0.19%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.92%	1.21%	-0.29%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.92%	0.87%	+0.05%

CBUDX vs. PRTBX - Expense Ratio Comparison

CBUDX has a 0.89% expense ratio, which is higher than PRTBX's 0.65% expense ratio.

Dividends

CBUDX vs. PRTBX - Dividend Comparison

CBUDX's dividend yield for the trailing twelve months is around 4.44%, more than PRTBX's 3.36% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018
CBUDX CrossingBridge Ultra-Short Duration Fund	4.44%	4.61%	5.68%	5.67%	2.94%	0.16%	0.00%	0.00%	0.00%
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%

Frequently Asked Questions

Can I hold both CBUDX and PRTBX in my portfolio?

CBUDX and PRTBX have a correlation of 0.11, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CBUDX or PRTBX?

CBUDX has higher volatility (0.29%) compared to PRTBX (0.22%). In terms of maximum drawdown, CBUDX dropped -0.40% vs PRTBX's -5.13%.

Which has better risk-adjusted returns?

CBUDX currently has the higher Sharpe Ratio (5.21 vs 4.41), 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.