SUNBX vs. FPFIX

Last updated Jun 23, 2026

SUNBX (Spectrum Unconstrained Fund) and FPFIX (FPA Flexible Fixed Income Fund) are both Nontraditional Bonds funds. Over the past 5 years, SUNBX returned 3.33%/yr vs 3.48%/yr for FPFIX. At a 0.41 correlation, their price movements are largely independent. SUNBX charges 2.43%/yr vs 0.51%/yr for FPFIX.

Performance

SUNBX vs. FPFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Spectrum Unconstrained Fund (SUNBX) and FPA Flexible Fixed Income Fund (FPFIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SUNBX achieves a 1.57% return, which is significantly higher than FPFIX's -0.11% return.

SUNBX

• 1D: 0.20%
• 1M: 1.41%
• YTD: 1.57%
• 6M: 1.82%
• 1Y: 7.43%
• 3Y*: 6.21%
• 5Y*: 3.33%
• 10Y*: —

FPFIX

• 1D: 0.20%
• 1M: 0.41%
• YTD: -0.11%
• 6M: -0.01%
• 1Y: 3.56%
• 3Y*: 5.70%
• 5Y*: 3.48%
• 10Y*: —

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

SUNBX vs. FPFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
SUNBX Spectrum Unconstrained Fund	1.57%	8.31%	1.35%	10.83%	-8.55%	6.12%
FPFIX FPA Flexible Fixed Income Fund	-0.11%	6.87%	5.28%	8.11%	-2.82%	0.93%

Correlation

The correlation between SUNBX and FPFIX is 0.28, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.28
Correlation (3Y) Calculated over the trailing 3-year period	0.46
Correlation (5Y) Calculated over the trailing 5-year period	0.41
Correlation (All Time) Calculated using the full available price history since Apr 16, 2021	0.41

The correlation between SUNBX and FPFIX shifts across timeframes, from 0.28 (1 year) to 0.46 (3 years), reflecting how their relationship changes across market environments.

Return for Risk

SUNBX vs. FPFIX — Risk / Return Rank

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

SUNBX

SUNBX Risk / Return Rank: 37
SUNBX Sharpe Ratio Rank: 42
SUNBX Sortino Ratio Rank: 38
SUNBX Omega Ratio Rank: 54
SUNBX Calmar Ratio Rank: 31
SUNBX Martin Ratio Rank: 21

FPFIX

FPFIX Risk / Return Rank: 29
FPFIX Sharpe Ratio Rank: 32
FPFIX Sortino Ratio Rank: 33
FPFIX Omega Ratio Rank: 36
FPFIX Calmar Ratio Rank: 25
FPFIX Martin Ratio Rank: 19

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.

SUNBX vs. FPFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Spectrum Unconstrained Fund (SUNBX) and FPA Flexible Fixed Income Fund (FPFIX). 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.

	SUNBX	FPFIX	Difference
Sharpe ratio: Return per unit of total volatility	1.75	1.52	+0.23
Sortino ratio: Return per unit of downside risk	2.40	2.23	+0.17
Omega ratio: Gain probability vs. loss probability	1.37	1.30	+0.08
Calmar ratio: Return relative to maximum drawdown	1.97	1.76	+0.22
Martin ratio: Return relative to average drawdown	4.95	4.63	+0.31

SUNBX vs. FPFIX - Sharpe Ratio Comparison

The current SUNBX Sharpe Ratio is 1.75, which is comparable to the FPFIX Sharpe Ratio of 1.52. The chart below compares the historical Sharpe Ratios of SUNBX and FPFIX, 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

SUNBX vs. FPFIX - Drawdown Comparison

The maximum SUNBX drawdown since its inception was -10.36%, which is greater than FPFIX's maximum drawdown of -4.11%. Use the drawdown chart below to compare losses from any high point for SUNBX and FPFIX.

Drawdown Indicators

	SUNBX	FPFIX	Difference
Max Drawdown Largest peak-to-trough decline	-10.36%	-4.11%	-6.25%
Max Drawdown (1Y) Largest decline over 1 year	-3.84%	-2.10%	-1.74%
Max Drawdown (3Y) Largest decline over 3 years	-3.84%	-2.10%	-1.74%
Max Drawdown (5Y) Largest decline over 5 years	-10.36%	-4.11%	-6.25%
Current Drawdown Current decline from peak	-0.94%	-1.51%	+0.57%
Average Drawdown Average peak-to-trough decline	-3.55%	-0.60%	-2.95%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.53%	0.79%	+0.74%

Volatility

SUNBX vs. FPFIX - Volatility Comparison

Spectrum Unconstrained Fund (SUNBX) has a higher volatility of 1.87% compared to FPA Flexible Fixed Income Fund (FPFIX) at 0.80%. This indicates that SUNBX's price experiences larger fluctuations and is considered to be riskier than FPFIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SUNBX	FPFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.87%	0.80%	+1.07%
Volatility (6M) Calculated over the trailing 6-month period	3.62%	1.83%	+1.79%
Volatility (1Y) Calculated over the trailing 1-year period	4.33%	2.42%	+1.91%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.08%	2.34%	+2.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.02%	2.09%	+2.93%

SUNBX vs. FPFIX - Expense Ratio Comparison

SUNBX has a 2.43% expense ratio, which is higher than FPFIX's 0.51% expense ratio.

Dividends

SUNBX vs. FPFIX - Dividend Comparison

SUNBX's dividend yield for the trailing twelve months is around 2.80%, less than FPFIX's 3.74% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
FPFIX FPA Flexible Fixed Income Fund	3.74%	3.78%	4.76%	3.95%	2.92%	2.26%	3.00%	2.42%
SUNBX Spectrum Unconstrained Fund	2.80%	2.84%	3.75%	2.81%	0.00%	8.52%	0.00%	0.00%

Frequently Asked Questions

Can I hold both SUNBX and FPFIX in my portfolio?

SUNBX and FPFIX have a correlation of 0.28, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SUNBX or FPFIX?

SUNBX has higher volatility (1.87%) compared to FPFIX (0.80%). In terms of maximum drawdown, SUNBX dropped -10.36% vs FPFIX's -4.11%.

Which has better risk-adjusted returns?

SUNBX currently has the higher Sharpe Ratio (1.75 vs 1.52), 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.