CMPIX vs. SSAFX

Last updated Jun 4, 2026

CMPIX (Principal Core Fixed Income) and SSAFX (State Street Aggregate Bond Index Portfolio) are both Intermediate Core Bond funds. Over the past 10 years, CMPIX returned 1.68%/yr vs 27.83%/yr for SSAFX. Their correlation of 0.92 suggests significant overlap in exposure. CMPIX charges 0.74%/yr vs 0.02%/yr for SSAFX.

Performance

CMPIX vs. SSAFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Principal Core Fixed Income (CMPIX) and State Street Aggregate Bond Index Portfolio (SSAFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CMPIX achieves a 0.26% return, which is significantly lower than SSAFX's 0.42% return. Over the past 10 years, CMPIX has underperformed SSAFX with an annualized return of 1.68%, while SSAFX has yielded a comparatively higher 27.83% annualized return.

CMPIX

• 1D: 0.00%
• 1M: 0.53%
• YTD: 0.26%
• 6M: 0.10%
• 1Y: 5.06%
• 3Y*: 3.68%
• 5Y*: -0.19%
• 10Y*: 1.68%

SSAFX

• 1D: 0.05%
• 1M: 0.49%
• YTD: 0.42%
• 6M: 0.33%
• 1Y: 5.39%
• 3Y*: 3.90%
• 5Y*: 0.09%
• 10Y*: 27.83%

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

CMPIX vs. SSAFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CMPIX Principal Core Fixed Income	0.26%	6.76%	1.26%	4.89%	-13.34%	-2.03%	7.84%	8.59%	-0.24%	4.16%
SSAFX State Street Aggregate Bond Index Portfolio	0.42%	6.81%	1.34%	5.61%	-13.30%	-1.72%	978.57%	8.69%	-0.12%	3.38%

Correlation

The correlation between CMPIX and SSAFX is 0.93, 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	0.93
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Sep 23, 2014	0.92

The correlation between CMPIX and SSAFX has been stable across timeframes, ranging from 0.92 to 0.96 - a consistent structural relationship.

Return for Risk

CMPIX vs. SSAFX — Risk / Return Rank

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

CMPIX

CMPIX Risk / Return Rank: 20
CMPIX Sharpe Ratio Rank: 20
CMPIX Sortino Ratio Rank: 20
CMPIX Omega Ratio Rank: 20
CMPIX Calmar Ratio Rank: 21
CMPIX Martin Ratio Rank: 19

SSAFX

SSAFX Risk / Return Rank: 26
SSAFX Sharpe Ratio Rank: 26
SSAFX Sortino Ratio Rank: 27
SSAFX Omega Ratio Rank: 24
SSAFX Calmar Ratio Rank: 27
SSAFX Martin Ratio Rank: 24

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.

CMPIX vs. SSAFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Principal Core Fixed Income (CMPIX) and State Street Aggregate Bond Index Portfolio (SSAFX). 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.

	CMPIX	SSAFX	Difference
Sharpe ratio: Return per unit of total volatility	1.29	1.45	-0.16
Sortino ratio: Return per unit of downside risk	1.89	2.17	-0.28
Omega ratio: Gain probability vs. loss probability	1.23	1.26	-0.02
Calmar ratio: Return relative to maximum drawdown	1.71	1.96	-0.25
Martin ratio: Return relative to average drawdown	5.17	6.00	-0.83
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CMPIX vs. SSAFX - Sharpe Ratio Comparison

The current CMPIX Sharpe Ratio is 1.29, which is comparable to the SSAFX Sharpe Ratio of 1.45. The chart below compares the historical Sharpe Ratios of CMPIX and SSAFX, 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

	CMPIX	SSAFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.29	1.45	-0.16
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.03	0.01	-0.05
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.35	0.10	+0.25
Sharpe Ratio (All Time) Calculated using the full available price history	0.98	0.09	+0.89

Drawdowns

CMPIX vs. SSAFX - Drawdown Comparison

The maximum CMPIX drawdown since its inception was -18.80%, roughly equal to the maximum SSAFX drawdown of -18.74%. Use the drawdown chart below to compare losses from any high point for CMPIX and SSAFX.

Drawdown Indicators

	CMPIX	SSAFX	Difference
Max Drawdown Largest peak-to-trough decline	-18.80%	-18.74%	-0.06%
Max Drawdown (1Y) Largest decline over 1 year	-2.97%	-2.74%	-0.23%
Max Drawdown (3Y) Largest decline over 3 years	-6.58%	-6.09%	-0.49%
Max Drawdown (5Y) Largest decline over 5 years	-18.51%	-18.10%	-0.41%
Max Drawdown (10Y) Largest decline over 10 years	-18.80%	-18.74%	-0.06%
Current Drawdown Current decline from peak	-3.49%	-2.62%	-0.87%
Average Drawdown Average peak-to-trough decline	-2.48%	-4.41%	+1.93%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.98%	0.90%	+0.08%

Volatility

CMPIX vs. SSAFX - Volatility Comparison

Principal Core Fixed Income (CMPIX) has a higher volatility of 1.42% compared to State Street Aggregate Bond Index Portfolio (SSAFX) at 1.29%. This indicates that CMPIX's price experiences larger fluctuations and is considered to be riskier than SSAFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	CMPIX	SSAFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.42%	1.29%	+0.13%
Volatility (6M) Calculated over the trailing 6-month period	2.93%	2.65%	+0.28%
Volatility (1Y) Calculated over the trailing 1-year period	3.96%	3.74%	+0.22%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.81%	5.95%	-0.14%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.82%	277.51%	-272.69%

CMPIX vs. SSAFX - Expense Ratio Comparison

CMPIX has a 0.74% expense ratio, which is higher than SSAFX's 0.02% expense ratio.

Dividends

CMPIX vs. SSAFX - Dividend Comparison

CMPIX's dividend yield for the trailing twelve months is around 3.43%, less than SSAFX's 4.16% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
CMPIX Principal Core Fixed Income	3.43%	3.35%	3.27%	2.37%	2.10%	1.94%	2.11%	2.71%	3.19%	2.91%	3.17%	3.29%
SSAFX State Street Aggregate Bond Index Portfolio	4.16%	3.70%	3.76%	3.16%	2.49%	1.90%	2.41%	2.88%	2.82%	2.42%	2.21%	3.21%

Frequently Asked Questions

Can I hold both CMPIX and SSAFX in my portfolio?

With a correlation of 0.93, CMPIX and SSAFX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, CMPIX or SSAFX?

CMPIX has higher volatility (1.42%) compared to SSAFX (1.29%). In terms of maximum drawdown, CMPIX dropped -18.80% vs SSAFX's -18.74%.

Which has better risk-adjusted returns?

SSAFX currently has the higher Sharpe Ratio (1.45 vs 1.29), 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.