WIBMX vs. SSAFX

Last updated Jun 23, 2026

WIBMX (Wilmington Broad Market Bond Fund) and SSAFX (State Street Aggregate Bond Index Portfolio) are both Intermediate Core Bond funds. Over the past 5 years, WIBMX returned -0.20%/yr vs -0.06%/yr for SSAFX. Their correlation of 0.94 suggests significant overlap in exposure. WIBMX charges 0.57%/yr vs 0.02%/yr for SSAFX.

Performance

WIBMX vs. SSAFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Wilmington Broad Market Bond Fund (WIBMX) 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, WIBMX achieves a 0.20% return, which is significantly lower than SSAFX's 0.62% return.

WIBMX

• 1D: 0.34%
• 1M: 1.02%
• YTD: 0.20%
• 6M: 0.67%
• 1Y: 4.57%
• 3Y*: 3.61%
• 5Y*: -0.20%
• 10Y*: —

SSAFX

• 1D: 0.27%
• 1M: 0.90%
• YTD: 0.62%
• 6M: 0.77%
• 1Y: 4.76%
• 3Y*: 3.94%
• 5Y*: -0.06%
• 10Y*: 27.82%

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

WIBMX vs. SSAFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
WIBMX Wilmington Broad Market Bond Fund	0.20%	7.13%	0.68%	5.10%	-12.80%	-1.86%	7.78%	8.33%	1.65%
SSAFX State Street Aggregate Bond Index Portfolio	0.62%	6.81%	1.34%	5.61%	-13.30%	-1.72%	978.57%	8.69%	1.74%

Correlation

The correlation between WIBMX and SSAFX is 0.92, 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	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (All Time) Calculated using the full available price history since Sep 24, 2018	0.94

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

Return for Risk

WIBMX vs. SSAFX — Risk / Return Rank

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

WIBMX

WIBMX Risk / Return Rank: 18
WIBMX Sharpe Ratio Rank: 19
WIBMX Sortino Ratio Rank: 19
WIBMX Omega Ratio Rank: 17
WIBMX Calmar Ratio Rank: 19
WIBMX Martin Ratio Rank: 16

SSAFX

SSAFX Risk / Return Rank: 24
SSAFX Sharpe Ratio Rank: 24
SSAFX Sortino Ratio Rank: 26
SSAFX Omega Ratio Rank: 23
SSAFX Calmar Ratio Rank: 25
SSAFX Martin Ratio Rank: 22

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.

WIBMX vs. SSAFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Wilmington Broad Market Bond Fund (WIBMX) 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.

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.

	WIBMX	SSAFX	Difference
Sharpe ratio: Return per unit of total volatility	1.15	1.32	-0.16
Sortino ratio: Return per unit of downside risk	1.72	1.97	-0.25
Omega ratio: Gain probability vs. loss probability	1.20	1.23	-0.03
Calmar ratio: Return relative to maximum drawdown	1.49	1.76	-0.27
Martin ratio: Return relative to average drawdown	4.13	5.07	-0.94

WIBMX vs. SSAFX - Sharpe Ratio Comparison

The current WIBMX Sharpe Ratio is 1.15, which is comparable to the SSAFX Sharpe Ratio of 1.32. The chart below compares the historical Sharpe Ratios of WIBMX 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.

Drawdowns

WIBMX vs. SSAFX - Drawdown Comparison

The maximum WIBMX drawdown since its inception was -18.13%, roughly equal to the maximum SSAFX drawdown of -18.74%. Use the drawdown chart below to compare losses from any high point for WIBMX and SSAFX.

Drawdown Indicators

	WIBMX	SSAFX	Difference
Max Drawdown Largest peak-to-trough decline	-18.13%	-18.74%	+0.61%
Max Drawdown (1Y) Largest decline over 1 year	-3.07%	-2.74%	-0.33%
Max Drawdown (3Y) Largest decline over 3 years	-5.97%	-6.09%	+0.12%
Max Drawdown (5Y) Largest decline over 5 years	-17.64%	-18.10%	+0.46%
Max Drawdown (10Y) Largest decline over 10 years	—	-18.74%	—
Current Drawdown Current decline from peak	-2.88%	-2.42%	-0.46%
Average Drawdown Average peak-to-trough decline	-5.83%	-4.40%	-1.43%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.11%	0.95%	+0.16%

Volatility

WIBMX vs. SSAFX - Volatility Comparison

Wilmington Broad Market Bond Fund (WIBMX) has a higher volatility of 1.28% compared to State Street Aggregate Bond Index Portfolio (SSAFX) at 1.14%. This indicates that WIBMX'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

	WIBMX	SSAFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.28%	1.14%	+0.14%
Volatility (6M) Calculated over the trailing 6-month period	3.01%	2.72%	+0.29%
Volatility (1Y) Calculated over the trailing 1-year period	3.97%	3.67%	+0.30%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.68%	5.95%	-0.27%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.11%	277.40%	-272.29%

WIBMX vs. SSAFX - Expense Ratio Comparison

WIBMX has a 0.57% expense ratio, which is higher than SSAFX's 0.02% expense ratio.

Dividends

WIBMX vs. SSAFX - Dividend Comparison

WIBMX's dividend yield for the trailing twelve months is around 3.81%, less than SSAFX's 4.15% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SSAFX State Street Aggregate Bond Index Portfolio	4.15%	3.70%	3.76%	3.16%	2.49%	1.90%	2.41%	2.88%	2.82%	2.42%	2.21%	3.21%
WIBMX Wilmington Broad Market Bond Fund	3.81%	3.98%	2.89%	2.39%	1.87%	1.75%	2.33%	2.55%	0.88%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both WIBMX and SSAFX in my portfolio?

With a correlation of 0.92, WIBMX 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, WIBMX or SSAFX?

WIBMX has higher volatility (1.28%) compared to SSAFX (1.14%). In terms of maximum drawdown, WIBMX dropped -18.13% vs SSAFX's -18.74%.

Which has better risk-adjusted returns?

SSAFX currently has the higher Sharpe Ratio (1.32 vs 1.15), 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.