BUBIX vs. PRTBX

Last updated Jun 3, 2026

BUBIX (Baird Ultra Short Bond Fund Institutional Class) and PRTBX (Permanent Portfolio Short-Term Treasury Portfolio) are both Ultrashort Bond funds. Over the past 10 years, BUBIX returned 2.67%/yr vs 1.26%/yr for PRTBX. At a 0.21 correlation, their price movements are largely independent. BUBIX charges 0.15%/yr vs 0.65%/yr for PRTBX.

Performance

BUBIX vs. PRTBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Baird Ultra Short Bond Fund Institutional Class (BUBIX) 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, BUBIX achieves a 1.17% return, which is significantly higher than PRTBX's 0.76% return. Over the past 10 years, BUBIX has outperformed PRTBX with an annualized return of 2.67%, while PRTBX has yielded a comparatively lower 1.26% annualized return.

BUBIX

• 1D: 0.00%
• 1M: 0.35%
• YTD: 1.17%
• 6M: 1.53%
• 1Y: 4.03%
• 3Y*: 4.99%
• 5Y*: 3.58%
• 10Y*: 2.67%

PRTBX

• 1D: -0.02%
• 1M: 0.15%
• YTD: 0.76%
• 6M: 1.06%
• 1Y: 3.18%
• 3Y*: 3.85%
• 5Y*: 1.98%
• 10Y*: 1.26%

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

BUBIX vs. PRTBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
BUBIX Baird Ultra Short Bond Fund Institutional Class	1.17%	4.44%	5.65%	5.71%	0.96%	0.20%	1.66%	3.11%	1.95%	1.30%
PRTBX Permanent Portfolio Short-Term Treasury Portfolio	0.76%	4.19%	4.12%	3.79%	-2.28%	-0.74%	0.10%	1.76%	1.16%	0.12%

Correlation

The correlation between BUBIX and PRTBX is 0.15, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.15
Correlation (3Y) Calculated over the trailing 3-year period	0.28
Correlation (5Y) Calculated over the trailing 5-year period	0.32
Correlation (10Y) Calculated over the trailing 10-year period	0.23
Correlation (All Time) Calculated using the full available price history since Jan 6, 2014	0.21

The correlation between BUBIX and PRTBX shifts across timeframes, from 0.15 (1 year) to 0.32 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

BUBIX vs. PRTBX — Risk / Return Rank

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

BUBIX

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

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: 99
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.

BUBIX vs. PRTBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Baird Ultra Short Bond Fund Institutional Class (BUBIX) 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.

	BUBIX	PRTBX	Difference
Sharpe ratio Return per unit of total volatility	5.81	4.64	+1.17
Sortino ratio Return per unit of downside risk	11.91	8.62	+3.29
Omega ratio Gain probability vs. loss probability	7.70	2.23	+5.47
Calmar ratio Return relative to maximum drawdown	13.61	10.12	+3.49
Martin ratio Return relative to average drawdown	98.92	49.14	+49.78
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

BUBIX vs. PRTBX - Sharpe Ratio Comparison

The current BUBIX Sharpe Ratio is 5.81, which is comparable to the PRTBX Sharpe Ratio of 4.64. The chart below compares the historical Sharpe Ratios of BUBIX 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.

Sharpe Ratios by Period

	BUBIX	PRTBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	5.81	4.64	+1.17
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	4.53	1.65	+2.88
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	3.77	1.46	+2.30
Sharpe Ratio (All Time) Calculated using the full available price history	3.43	3.89	-0.46

Drawdowns

BUBIX vs. PRTBX - Drawdown Comparison

The maximum BUBIX drawdown since its inception was -1.88%, smaller than the maximum PRTBX drawdown of -5.13%. Use the drawdown chart below to compare losses from any high point for BUBIX and PRTBX.

Drawdown Indicators

	BUBIX	PRTBX	Difference
Max Drawdown Largest peak-to-trough decline	-1.88%	-5.13%	+3.25%
Max Drawdown (1Y) Largest decline over 1 year	-0.30%	-0.32%	+0.02%
Max Drawdown (3Y) Largest decline over 3 years	-0.30%	-0.44%	+0.14%
Max Drawdown (5Y) Largest decline over 5 years	-0.68%	-3.70%	+3.02%
Max Drawdown (10Y) Largest decline over 10 years	-1.88%	-4.36%	+2.48%
Current Drawdown Current decline from peak	0.00%	-0.02%	+0.02%
Average Drawdown Average peak-to-trough decline	-0.05%	-0.96%	+0.91%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.04%	0.07%	-0.03%

Volatility

BUBIX vs. PRTBX - Volatility Comparison

Baird Ultra Short Bond Fund Institutional Class (BUBIX) has a higher volatility of 0.17% compared to Permanent Portfolio Short-Term Treasury Portfolio (PRTBX) at 0.15%. This indicates that BUBIX'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

	BUBIX	PRTBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.17%	0.15%	+0.02%
Volatility (6M) Calculated over the trailing 6-month period	0.52%	0.40%	+0.12%
Volatility (1Y) Calculated over the trailing 1-year period	0.70%	0.68%	+0.02%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.79%	1.21%	-0.42%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.71%	0.86%	-0.15%

BUBIX vs. PRTBX - Expense Ratio Comparison

BUBIX has a 0.15% expense ratio, which is lower than PRTBX's 0.65% expense ratio.

Dividends

BUBIX vs. PRTBX - Dividend Comparison

BUBIX's dividend yield for the trailing twelve months is around 3.96%, more than PRTBX's 3.36% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BUBIX Baird Ultra Short Bond Fund Institutional Class	3.96%	4.16%	5.31%	4.65%	1.56%	0.50%	1.44%	2.57%	2.13%	1.29%	1.04%	0.80%
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%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both BUBIX and PRTBX in my portfolio?

BUBIX and PRTBX have a correlation of 0.15, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BUBIX or PRTBX?

BUBIX has higher volatility (0.17%) compared to PRTBX (0.15%). In terms of maximum drawdown, BUBIX dropped -1.88% vs PRTBX's -5.13%.

Which has better risk-adjusted returns?

BUBIX currently has the higher Sharpe Ratio (5.81 vs 4.64), 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.