CPPAX vs. FUMBX

Last updated Jun 24, 2026

CPPAX (American Funds Preservation Portfolio) and FUMBX (Fidelity Short-Term Treasury Bond Index Fund) are both Short-Term Bond funds. Over the past 5 years, CPPAX returned 1.26%/yr vs 1.31%/yr for FUMBX. Their correlation of 0.80 suggests significant overlap in exposure. CPPAX charges 0.61%/yr vs 0.03%/yr for FUMBX.

Performance

CPPAX vs. FUMBX - Performance Comparison

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

Returns By Period

In the year-to-date period, CPPAX achieves a -0.31% return, which is significantly lower than FUMBX's -0.11% return.

CPPAX

• 1D: -0.11%
• 1M: 0.09%
• YTD: -0.31%
• 6M: -0.17%
• 1Y: 2.32%
• 3Y*: 4.00%
• 5Y*: 1.26%
• 10Y*: 1.61%

FUMBX

• 1D: -0.10%
• 1M: 0.16%
• YTD: -0.11%
• 6M: 0.24%
• 1Y: 2.69%
• 3Y*: 4.03%
• 5Y*: 1.31%
• 10Y*: —

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

CPPAX vs. FUMBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CPPAX American Funds Preservation Portfolio	-0.31%	5.51%	3.66%	4.09%	-6.14%	-0.62%	5.84%	3.92%	0.89%	-0.40%
FUMBX Fidelity Short-Term Treasury Bond Index Fund	-0.11%	5.83%	3.25%	4.47%	-5.84%	-1.38%	4.22%	4.19%	1.47%	-0.33%

Correlation

The correlation between CPPAX and FUMBX is 0.77, 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	0.77
Correlation (3Y) Calculated over the trailing 3-year period	0.83
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (All Time) Calculated using the full available price history since Oct 19, 2017	0.80

The correlation between CPPAX and FUMBX has been stable across timeframes, ranging from 0.77 to 0.85 - a consistent structural relationship.

Return for Risk

CPPAX vs. FUMBX — Risk / Return Rank

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

CPPAX

CPPAX Risk / Return Rank: 22
CPPAX Sharpe Ratio Rank: 22
CPPAX Sortino Ratio Rank: 22
CPPAX Omega Ratio Rank: 28
CPPAX Calmar Ratio Rank: 20
CPPAX Martin Ratio Rank: 19

FUMBX

FUMBX Risk / Return Rank: 29
FUMBX Sharpe Ratio Rank: 27
FUMBX Sortino Ratio Rank: 32
FUMBX Omega Ratio Rank: 32
FUMBX Calmar Ratio Rank: 29
FUMBX Martin Ratio Rank: 25

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. FUMBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Preservation Portfolio (CPPAX) and Fidelity Short-Term Treasury Bond Index Fund (FUMBX). 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.

	CPPAX	FUMBX	Difference
Sharpe ratio: Return per unit of total volatility	1.22	1.39	-0.17
Sortino ratio: Return per unit of downside risk	1.82	2.19	-0.37
Omega ratio: Gain probability vs. loss probability	1.26	1.28	-0.02
Calmar ratio: Return relative to maximum drawdown	1.53	1.89	-0.36
Martin ratio: Return relative to average drawdown	4.49	5.55	-1.06

CPPAX vs. FUMBX - Sharpe Ratio Comparison

The current CPPAX Sharpe Ratio is 1.22, which is comparable to the FUMBX Sharpe Ratio of 1.39. The chart below compares the historical Sharpe Ratios of CPPAX and FUMBX, 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

CPPAX vs. FUMBX - Drawdown Comparison

The maximum CPPAX drawdown since its inception was -8.59%, roughly equal to the maximum FUMBX drawdown of -8.83%. Use the drawdown chart below to compare losses from any high point for CPPAX and FUMBX.

Drawdown Indicators

	CPPAX	FUMBX	Difference
Max Drawdown Largest peak-to-trough decline	-8.59%	-8.83%	+0.24%
Max Drawdown (1Y) Largest decline over 1 year	-1.67%	-1.54%	-0.13%
Max Drawdown (3Y) Largest decline over 3 years	-1.67%	-1.57%	-0.10%
Max Drawdown (5Y) Largest decline over 5 years	-8.57%	-8.60%	+0.03%
Max Drawdown (10Y) Largest decline over 10 years	-8.59%	—	—
Current Drawdown Current decline from peak	-1.17%	-1.06%	-0.11%
Average Drawdown Average peak-to-trough decline	-1.31%	-1.85%	+0.54%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.57%	0.52%	+0.05%

Volatility

CPPAX vs. FUMBX - Volatility Comparison

American Funds Preservation Portfolio (CPPAX) has a higher volatility of 0.76% compared to Fidelity Short-Term Treasury Bond Index Fund (FUMBX) at 0.70%. This indicates that CPPAX's price experiences larger fluctuations and is considered to be riskier than FUMBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CPPAX	FUMBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.76%	0.70%	+0.06%
Volatility (6M) Calculated over the trailing 6-month period	1.53%	1.56%	-0.03%
Volatility (1Y) Calculated over the trailing 1-year period	2.09%	2.08%	+0.01%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.07%	2.93%	+0.14%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.49%	2.49%	0.00%

CPPAX vs. FUMBX - Expense Ratio Comparison

CPPAX has a 0.61% expense ratio, which is higher than FUMBX's 0.03% expense ratio.

Dividends

CPPAX vs. FUMBX - Dividend Comparison

CPPAX's dividend yield for the trailing twelve months is around 3.50%, less than FUMBX's 3.77% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CPPAX American Funds Preservation Portfolio	3.50%	3.56%	4.03%	3.24%	2.02%	0.95%	2.32%	1.91%	1.59%	1.06%	1.26%	1.11%
FUMBX Fidelity Short-Term Treasury Bond Index Fund	3.77%	3.51%	2.91%	1.64%	0.86%	1.15%	1.41%	1.88%	1.64%	0.34%	0.00%	0.00%

Frequently Asked Questions

Can I hold both CPPAX and FUMBX in my portfolio?

CPPAX and FUMBX have a correlation of 0.77, 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 FUMBX?

CPPAX has higher volatility (0.76%) compared to FUMBX (0.70%). In terms of maximum drawdown, CPPAX dropped -8.59% vs FUMBX's -8.83%.

Which has better risk-adjusted returns?

FUMBX currently has the higher Sharpe Ratio (1.39 vs 1.22), 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.