TFBYX vs. SNSAX

Last updated Aug 6, 2026

TFBYX (American Beacon TwentyFour Sustainable Short Term Bond Fund) and SNSAX (SEI Asset Allocation Trust Defensive Strategy Fund) are both Short-Term Bond funds. Over the past 5 years, TFBYX returned 2.99%/yr vs 2.98%/yr for SNSAX. Their 0.46 correlation means their historical movements had little consistent relationship. TFBYX charges 0.57%/yr vs 0.61%/yr for SNSAX.

Performance

TFBYX vs. SNSAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Beacon TwentyFour Sustainable Short Term Bond Fund (TFBYX) and SEI Asset Allocation Trust Defensive Strategy Fund (SNSAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TFBYX achieves a 1.33% return, which is significantly lower than SNSAX's 2.54% return.

TFBYX

• 1D: 0.11%
• 1M: -0.11%
• 6M: 0.76%
• YTD: 1.33%
• 1Y: 3.22%
• 3Y*: 5.58%
• 5Y*: 2.99%
• 10Y*: —
• ALL TIME*: 2.96%

SNSAX

• 1D: 0.20%
• 1M: 0.46%
• 6M: 1.70%
• YTD: 2.54%
• 1Y: 4.91%
• 3Y*: 5.48%
• 5Y*: 2.98%
• 10Y*: 2.85%
• ALL TIME*: 2.52%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
SNSAX SEI Asset Allocation Trust Defensive Strategy Fund	$0.00	$0.00	$0.00
TFBYX American Beacon TwentyFour Sustainable Short Term Bond Fund	$0.00	$0.00	$0.00

TFBYX vs. SNSAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
TFBYX American Beacon TwentyFour Sustainable Short Term Bond Fund	1.33%	5.58%	5.81%	7.22%	-3.86%	0.70%	2.74%
SNSAX SEI Asset Allocation Trust Defensive Strategy Fund	2.54%	6.29%	5.12%	4.67%	-3.55%	2.35%	1.80%

Correlation

The correlation between TFBYX and SNSAX is 0.49, which is low. Their historical price movements had little consistent relationship.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.49
Correlation (3Y) Balances recent behavior with more history.	0.45
Correlation (5Y) Shows whether the relationship held over a longer period.	0.48
Correlation (All Time) Calculated using the full available price history since Feb 19, 2020	0.46

Return for Risk

TFBYX vs. SNSAX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

TFBYX

TFBYX Risk / Return Rank: 57
TFBYX Sharpe Ratio Rank: 54
TFBYX Sortino Ratio Rank: 63
TFBYX Omega Ratio Rank: 81
TFBYX Calmar Ratio Rank: 44
TFBYX Martin Ratio Rank: 41

SNSAX

SNSAX Risk / Return Rank: 92
SNSAX Sharpe Ratio Rank: 95
SNSAX Sortino Ratio Rank: 95
SNSAX Omega Ratio Rank: 95
SNSAX Calmar Ratio Rank: 86
SNSAX Martin Ratio Rank: 89

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

TFBYX vs. SNSAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Beacon TwentyFour Sustainable Short Term Bond Fund (TFBYX) and SEI Asset Allocation Trust Defensive Strategy Fund (SNSAX). 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.

	TFBYX	SNSAX	Difference
Sharpe ratio: Return per unit of total volatility	1.68	2.69	-1.01
Sortino ratio: Return per unit of downside risk	2.54	4.03	-1.49
Omega ratio: Gain probability vs. loss probability	1.40	1.55	-0.15
Calmar ratio: Return relative to maximum drawdown	2.02	3.44	-1.41
Martin ratio: Return relative to average drawdown	6.68	13.67	-6.99

TFBYX vs. SNSAX - Sharpe Ratio Comparison

The current TFBYX Sharpe Ratio is 1.68, which is lower than the SNSAX Sharpe Ratio of 2.69. The chart below compares the historical Sharpe Ratios of TFBYX and SNSAX, 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

TFBYX vs. SNSAX - Drawdown Comparison

The maximum TFBYX drawdown since its inception was -7.41%, smaller than the maximum SNSAX drawdown of -12.22%. Use the drawdown chart below to compare losses from any high point for TFBYX and SNSAX.

Drawdown Indicators

	TFBYX	SNSAX	Difference
Max Drawdown Largest peak-to-trough decline	-7.41%	-12.22%	+4.81%
Max Drawdown (1Y) Largest decline over 1 year	-1.60%	-1.41%	-0.19%
Max Drawdown (3Y) Largest decline over 3 years	-1.60%	-1.96%	+0.36%
Max Drawdown (5Y) Largest decline over 5 years	-7.41%	-6.87%	-0.54%
Max Drawdown (10Y) Largest decline over 10 years	—	-6.87%	—
Current Drawdown Current decline from peak	-0.11%	0.00%	-0.11%
Average Drawdown Average peak-to-trough decline	-1.13%	-1.82%	+0.69%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.48%	0.35%	+0.13%

Volatility

TFBYX vs. SNSAX - Volatility Comparison

American Beacon TwentyFour Sustainable Short Term Bond Fund (TFBYX) has a higher volatility of 0.53% compared to SEI Asset Allocation Trust Defensive Strategy Fund (SNSAX) at 0.47%. This indicates that TFBYX's price experiences larger fluctuations and is considered to be riskier than SNSAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TFBYX	SNSAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.53%	0.47%	+0.06%
Volatility (6M) Calculated over the trailing 6-month period	1.72%	1.42%	+0.30%
Volatility (1Y) Calculated over the trailing 1-year period	1.93%	1.82%	+0.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.65%	2.80%	-1.15%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.68%	2.58%	-0.90%

TFBYX vs. SNSAX - Expense Ratio Comparison

TFBYX has a 0.57% expense ratio, which is lower than SNSAX's 0.61% expense ratio.

Dividends

TFBYX vs. SNSAX - Dividend Comparison

TFBYX's dividend yield for the trailing twelve months is around 3.75%, more than SNSAX's 3.15% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SNSAX SEI Asset Allocation Trust Defensive Strategy Fund	3.15%	3.19%	4.20%	3.08%	3.74%	3.47%	1.88%	2.40%	1.81%	1.85%	1.19%	1.21%
TFBYX American Beacon TwentyFour Sustainable Short Term Bond Fund	3.75%	3.84%	3.79%	3.73%	12.53%	3.07%	2.17%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both TFBYX and SNSAX in my portfolio?

TFBYX and SNSAX have a correlation of 0.49, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TFBYX or SNSAX?

TFBYX has higher volatility (0.53%) compared to SNSAX (0.47%). In terms of maximum drawdown, TFBYX dropped -7.41% vs SNSAX's -12.22%.

Which has better risk-adjusted returns?

SNSAX currently has the higher Sharpe Ratio (2.69 vs 1.68), 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.