ASEC vs. SDSI

Last updated Jul 8, 2026

ASEC (American Century Securitized Credit ETF) and SDSI (American Century Short Duration Strategic Income ETF) are both exchange-traded funds - ASEC is a Mortgage Backed Securities fund actively managed by American Century, while SDSI is a Short-Term Bond fund tracking the Bloomberg U.S. 1-3 Year Government/Credit Bond Index. ASEC is actively managed, while SDSI is passively managed. At a correlation of -0.12, they often move in opposite directions. ASEC charges 0.29%/yr vs 0.33%/yr for SDSI.

Performance

ASEC vs. SDSI - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Securitized Credit ETF (ASEC) and American Century Short Duration Strategic Income ETF (SDSI). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

ASEC

• 1D: 0.10%
• 1M: 0.32%
• 6M: —
• YTD: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

SDSI

• 1D: -0.12%
• 1M: 0.49%
• 6M: 1.35%
• YTD: 1.55%
• 1Y: 4.79%
• 3Y*: 6.00%
• 5Y*: —
• 10Y*: —

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

ASEC vs. SDSI - Yearly Performance Comparison

	2026 (YTD)
ASEC American Century Securitized Credit ETF	0.10%
SDSI American Century Short Duration Strategic Income ETF	0.41%

Correlation

The correlation between ASEC and SDSI is -0.12, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (All Time) Calculated using the full available price history since May 28, 2026	-0.12

Return for Risk

ASEC vs. SDSI — Risk / Return Rank

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

ASEC

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

SDSI

SDSI Risk / Return Rank: 93
SDSI Sharpe Ratio Rank: 95
SDSI Sortino Ratio Rank: 96
SDSI Omega Ratio Rank: 95
SDSI Calmar Ratio Rank: 87
SDSI Martin Ratio Rank: 93

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.

ASEC vs. SDSI - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Securitized Credit ETF (ASEC) and American Century Short Duration Strategic Income ETF (SDSI). 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.

	ASEC	SDSI	Difference
Sharpe ratio: Return per unit of total volatility	—	3.02	—
Sortino ratio: Return per unit of downside risk	—	4.57	—
Omega ratio: Gain probability vs. loss probability	—	1.61	—
Calmar ratio: Return relative to maximum drawdown	—	4.11	—
Martin ratio: Return relative to average drawdown	—	19.47	—

Drawdowns

ASEC vs. SDSI - Drawdown Comparison

The maximum ASEC drawdown since its inception was -0.46%, smaller than the maximum SDSI drawdown of -1.29%. Use the drawdown chart below to compare losses from any high point for ASEC and SDSI.

Drawdown Indicators

	ASEC	SDSI	Difference
Max Drawdown Largest peak-to-trough decline	-0.46%	-1.29%	+0.83%
Max Drawdown (1Y) Largest decline over 1 year	—	-1.17%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-1.29%	—
Current Drawdown Current decline from peak	0.00%	-0.12%	+0.12%
Average Drawdown Average peak-to-trough decline	-0.19%	-0.24%	+0.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.25%	—

Volatility

Volatility by Period

	ASEC	SDSI	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.49%	—
Volatility (6M) Calculated over the trailing 6-month period	—	1.19%	—
Volatility (1Y) Calculated over the trailing 1-year period	1.39%	1.60%	-0.21%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.39%	2.26%	-0.87%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.39%	2.26%	-0.87%

ASEC vs. SDSI - Expense Ratio Comparison

ASEC has a 0.29% expense ratio, which is lower than SDSI's 0.33% expense ratio.

Dividends

ASEC vs. SDSI - Dividend Comparison

ASEC's dividend yield for the trailing twelve months is around 0.45%, less than SDSI's 4.78% yield.

Position	TTM	2025	2024	2023	2022
ASEC American Century Securitized Credit ETF	0.45%	0.00%	0.00%	0.00%	0.00%
SDSI American Century Short Duration Strategic Income ETF	4.78%	4.91%	5.49%	5.37%	0.98%

Frequently Asked Questions

Can I hold both ASEC and SDSI in my portfolio?

ASEC and SDSI have a correlation of -0.12, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, ASEC or SDSI?

On fees, ASEC is cheaper at 0.29% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, ASEC or SDSI?

ASEC is cheaper with a 0.29% expense ratio, compared with 0.33% for SDSI.

Which ETF pays a higher dividend yield, ASEC or SDSI?

SDSI has the higher dividend yield at 4.78%, compared with 0.45% for ASEC.

What is the main difference between ASEC and SDSI?

ASEC is categorized as Mortgage Backed Securities, while SDSI is Short-Term Bond. Their fees differ too: 0.29% for ASEC and 0.33% for SDSI.