NISYX vs. SSASX

Last updated Jun 4, 2026

NISYX (American Beacon NIS Core Plus Bond Fund) and SSASX (State Street Income Fund) are both Intermediate Core-Plus Bond funds. Over the past 5 years, NISYX returned 0.65%/yr vs -0.64%/yr for SSASX. Their correlation of 0.95 suggests significant overlap in exposure. NISYX charges 0.53%/yr vs 0.20%/yr for SSASX.

Performance

NISYX vs. SSASX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Beacon NIS Core Plus Bond Fund (NISYX) and State Street Income Fund (SSASX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

NISYX

• 1D: 0.00%
• 1M: 0.49%
• YTD: 0.52%
• 6M: 0.45%
• 1Y: 5.65%
• 3Y*: 4.70%
• 5Y*: 0.65%
• 10Y*: —

SSASX

• 1D: 0.00%
• 1M: 0.35%
• YTD: -0.00%
• 6M: -0.08%
• 1Y: 5.12%
• 3Y*: 2.95%
• 5Y*: -0.64%
• 10Y*: —

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

NISYX vs. SSASX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
NISYX American Beacon NIS Core Plus Bond Fund	0.52%	7.34%	2.91%	5.88%	-13.42%	1.64%
SSASX State Street Income Fund	-0.00%	7.49%	-0.95%	4.83%	-13.74%	0.59%

Correlation

The correlation between NISYX and SSASX is 0.94, 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	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (All Time) Calculated using the full available price history since May 25, 2021	0.95

The correlation between NISYX and SSASX has been stable across timeframes, ranging from 0.94 to 0.95 - a consistent structural relationship.

Return for Risk

NISYX vs. SSASX — Risk / Return Rank

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

NISYX

NISYX Risk / Return Rank: 26
NISYX Sharpe Ratio Rank: 26
NISYX Sortino Ratio Rank: 28
NISYX Omega Ratio Rank: 26
NISYX Calmar Ratio Rank: 29
NISYX Martin Ratio Rank: 23

SSASX

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

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.

NISYX vs. SSASX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Beacon NIS Core Plus Bond Fund (NISYX) and State Street Income Fund (SSASX). 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.

	NISYX	SSASX	Difference
Sharpe ratio: Return per unit of total volatility	1.46	1.22	+0.24
Sortino ratio: Return per unit of downside risk	2.21	1.83	+0.38
Omega ratio: Gain probability vs. loss probability	1.27	1.22	+0.05
Calmar ratio: Return relative to maximum drawdown	1.99	1.50	+0.49
Martin ratio: Return relative to average drawdown	5.81	4.51	+1.30
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

NISYX vs. SSASX - Sharpe Ratio Comparison

The current NISYX Sharpe Ratio is 1.46, which is comparable to the SSASX Sharpe Ratio of 1.22. The chart below compares the historical Sharpe Ratios of NISYX and SSASX, 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

	NISYX	SSASX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.46	1.22	+0.24
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.12	-0.10	+0.22
Sharpe Ratio (All Time) Calculated using the full available price history	0.10	-0.10	+0.20

Drawdowns

NISYX vs. SSASX - Drawdown Comparison

The maximum NISYX drawdown since its inception was -17.97%, smaller than the maximum SSASX drawdown of -19.65%. Use the drawdown chart below to compare losses from any high point for NISYX and SSASX.

Drawdown Indicators

	NISYX	SSASX	Difference
Max Drawdown Largest peak-to-trough decline	-17.97%	-19.65%	+1.68%
Max Drawdown (1Y) Largest decline over 1 year	-2.84%	-3.42%	+0.58%
Max Drawdown (3Y) Largest decline over 3 years	-5.81%	-7.97%	+2.16%
Max Drawdown (5Y) Largest decline over 5 years	-17.97%	-19.65%	+1.68%
Current Drawdown Current decline from peak	-1.31%	-5.26%	+3.95%
Average Drawdown Average peak-to-trough decline	-6.37%	-9.68%	+3.31%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.97%	1.14%	-0.17%

Volatility

NISYX vs. SSASX - Volatility Comparison

The current volatility for American Beacon NIS Core Plus Bond Fund (NISYX) is 1.25%, while State Street Income Fund (SSASX) has a volatility of 1.46%. This indicates that NISYX experiences smaller price fluctuations and is considered to be less risky than SSASX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NISYX	SSASX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.25%	1.46%	-0.21%
Volatility (6M) Calculated over the trailing 6-month period	2.77%	2.96%	-0.19%
Volatility (1Y) Calculated over the trailing 1-year period	3.89%	4.22%	-0.33%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.60%	6.49%	-0.89%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.34%	6.49%	-1.15%

NISYX vs. SSASX - Expense Ratio Comparison

NISYX has a 0.53% expense ratio, which is higher than SSASX's 0.20% expense ratio.

Dividends

NISYX vs. SSASX - Dividend Comparison

NISYX's dividend yield for the trailing twelve months is around 4.48%, more than SSASX's 4.00% yield.

Position	TTM	2025	2024	2023	2022	2021	2020
NISYX American Beacon NIS Core Plus Bond Fund	4.48%	4.37%	4.42%	3.17%	2.27%	2.09%	0.56%
SSASX State Street Income Fund	4.00%	4.01%	2.76%	2.86%	2.48%	3.77%	0.00%

Frequently Asked Questions

Can I hold both NISYX and SSASX in my portfolio?

With a correlation of 0.94, NISYX and SSASX 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, NISYX or SSASX?

SSASX has higher volatility (1.46%) compared to NISYX (1.25%). In terms of maximum drawdown, NISYX dropped -17.97% vs SSASX's -19.65%.

Which has better risk-adjusted returns?

NISYX currently has the higher Sharpe Ratio (1.46 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.