CPPAX vs. VISTX

Last updated Jun 4, 2026

CPPAX (American Funds Preservation Portfolio) and VISTX (Vanguard Institutional Short-Term Bond Fund) are both Short-Term Bond funds. Over the past 10 years, CPPAX returned 1.67%/yr vs 2.45%/yr for VISTX. A 0.76 correlation means they provide meaningful diversification when combined. CPPAX charges 0.61%/yr vs 0.02%/yr for VISTX.

Performance

CPPAX vs. VISTX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Preservation Portfolio (CPPAX) and Vanguard Institutional Short-Term Bond Fund (VISTX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CPPAX achieves a -0.09% return, which is significantly lower than VISTX's 0.81% return. Over the past 10 years, CPPAX has underperformed VISTX with an annualized return of 1.67%, while VISTX has yielded a comparatively higher 2.45% annualized return.

CPPAX

• 1D: 0.00%
• 1M: 0.10%
• YTD: -0.09%
• 6M: 0.15%
• 1Y: 3.18%
• 3Y*: 3.96%
• 5Y*: 1.28%
• 10Y*: 1.67%

VISTX

• 1D: 0.00%
• 1M: 0.22%
• YTD: 0.81%
• 6M: 1.12%
• 1Y: 4.28%
• 3Y*: 5.14%
• 5Y*: 2.50%
• 10Y*: 2.45%

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

CPPAX vs. VISTX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CPPAX American Funds Preservation Portfolio	-0.09%	5.51%	3.66%	4.09%	-6.14%	-0.62%	5.84%	3.92%	0.89%	0.96%
VISTX Vanguard Institutional Short-Term Bond Fund	0.81%	5.68%	5.56%	4.98%	-3.73%	-0.04%	3.92%	4.20%	1.83%	1.42%

Correlation

The correlation between CPPAX and VISTX is 0.82, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.82
Correlation (3Y) Calculated over the trailing 3-year period	0.85
Correlation (5Y) Calculated over the trailing 5-year period	0.86
Correlation (10Y) Calculated over the trailing 10-year period	0.76
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.76

The correlation between CPPAX and VISTX has been stable across timeframes, ranging from 0.76 to 0.86 - a consistent structural relationship.

Return for Risk

CPPAX vs. VISTX — Risk / Return Rank

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

CPPAX

CPPAX Risk / Return Rank: 31
CPPAX Sharpe Ratio Rank: 29
CPPAX Sortino Ratio Rank: 33
CPPAX Omega Ratio Rank: 39
CPPAX Calmar Ratio Rank: 26
CPPAX Martin Ratio Rank: 26

VISTX

VISTX Risk / Return Rank: 94
VISTX Sharpe Ratio Rank: 94
VISTX Sortino Ratio Rank: 96
VISTX Omega Ratio Rank: 94
VISTX Calmar Ratio Rank: 92
VISTX Martin Ratio Rank: 94

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.

CPPAX vs. VISTX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Preservation Portfolio (CPPAX) and Vanguard Institutional Short-Term Bond Fund (VISTX). 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.

	CPPAX	VISTX	Difference
Sharpe ratio: Return per unit of total volatility	1.56	3.25	-1.69
Sortino ratio: Return per unit of downside risk	2.37	5.40	-3.03
Omega ratio: Gain probability vs. loss probability	1.34	1.75	-0.41
Calmar ratio: Return relative to maximum drawdown	1.92	5.00	-3.08
Martin ratio: Return relative to average drawdown	6.22	20.81	-14.59
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CPPAX vs. VISTX - Sharpe Ratio Comparison

The current CPPAX Sharpe Ratio is 1.56, which is lower than the VISTX Sharpe Ratio of 3.25. The chart below compares the historical Sharpe Ratios of CPPAX and VISTX, 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

	CPPAX	VISTX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.56	3.25	-1.69
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.42	1.35	-0.93
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.68	1.67	-0.99
Sharpe Ratio (All Time) Calculated using the full available price history	0.65	1.71	-1.06

Drawdowns

CPPAX vs. VISTX - Drawdown Comparison

The maximum CPPAX drawdown since its inception was -8.59%, which is greater than VISTX's maximum drawdown of -5.64%. Use the drawdown chart below to compare losses from any high point for CPPAX and VISTX.

Drawdown Indicators

	CPPAX	VISTX	Difference
Max Drawdown Largest peak-to-trough decline	-8.59%	-5.64%	-2.95%
Max Drawdown (1Y) Largest decline over 1 year	-1.67%	-0.86%	-0.81%
Max Drawdown (3Y) Largest decline over 3 years	-1.67%	-0.86%	-0.81%
Max Drawdown (5Y) Largest decline over 5 years	-8.57%	-5.64%	-2.93%
Max Drawdown (10Y) Largest decline over 10 years	-8.59%	-5.64%	-2.95%
Current Drawdown Current decline from peak	-0.96%	-0.08%	-0.88%
Average Drawdown Average peak-to-trough decline	-1.31%	-0.69%	-0.62%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.51%	0.21%	+0.30%

Volatility

CPPAX vs. VISTX - Volatility Comparison

American Funds Preservation Portfolio (CPPAX) has a higher volatility of 0.59% compared to Vanguard Institutional Short-Term Bond Fund (VISTX) at 0.39%. This indicates that CPPAX's price experiences larger fluctuations and is considered to be riskier than VISTX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CPPAX	VISTX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.59%	0.39%	+0.20%
Volatility (6M) Calculated over the trailing 6-month period	1.39%	0.87%	+0.52%
Volatility (1Y) Calculated over the trailing 1-year period	2.06%	1.33%	+0.73%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.06%	1.87%	+1.19%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.48%	1.47%	+1.01%

CPPAX vs. VISTX - Expense Ratio Comparison

CPPAX has a 0.61% expense ratio, which is higher than VISTX's 0.02% expense ratio.

Dividends

CPPAX vs. VISTX - Dividend Comparison

CPPAX's dividend yield for the trailing twelve months is around 3.49%, less than VISTX's 4.46% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CPPAX American Funds Preservation Portfolio	3.49%	3.56%	4.03%	3.24%	2.02%	0.95%	2.32%	1.91%	1.59%	1.06%	1.26%	1.11%
VISTX Vanguard Institutional Short-Term Bond Fund	4.46%	4.53%	5.03%	3.91%	1.76%	1.85%	2.33%	2.72%	2.32%	1.78%	1.51%	0.00%

Frequently Asked Questions

Can I hold both CPPAX and VISTX in my portfolio?

CPPAX and VISTX have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CPPAX or VISTX?

CPPAX has higher volatility (0.59%) compared to VISTX (0.39%). In terms of maximum drawdown, CPPAX dropped -8.59% vs VISTX's -5.64%.

Which has better risk-adjusted returns?

VISTX currently has the higher Sharpe Ratio (3.25 vs 1.56), 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.