ASEC vs. SPMB

Last updated Jul 8, 2026

ASEC (American Century Securitized Credit ETF) and SPMB (SPDR Portfolio Mortgage Backed Bond ETF) are both Mortgage Backed Securities funds. ASEC is actively managed, while SPMB is passively managed. At a 0.18 correlation, their price movements are largely independent. ASEC charges 0.29%/yr vs 0.04%/yr for SPMB.

Performance

ASEC vs. SPMB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Securitized Credit ETF (ASEC) and SPDR Portfolio Mortgage Backed Bond ETF (SPMB). 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*: —

SPMB

• 1D: -0.45%
• 1M: 0.41%
• 6M: 0.54%
• YTD: 0.61%
• 1Y: 5.44%
• 3Y*: 4.91%
• 5Y*: 0.25%
• 10Y*: 1.17%

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

ASEC vs. SPMB - Yearly Performance Comparison

	2026 (YTD)
ASEC American Century Securitized Credit ETF	0.10%
SPMB SPDR Portfolio Mortgage Backed Bond ETF	0.14%

Correlation

The correlation between ASEC and SPMB is 0.18, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (All Time) Calculated using the full available price history since May 28, 2026	0.18

Return for Risk

ASEC vs. SPMB — 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.

SPMB

SPMB Risk / Return Rank: 43
SPMB Sharpe Ratio Rank: 42
SPMB Sortino Ratio Rank: 44
SPMB Omega Ratio Rank: 41
SPMB Calmar Ratio Rank: 43
SPMB Martin Ratio Rank: 42

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. SPMB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Securitized Credit ETF (ASEC) and SPDR Portfolio Mortgage Backed Bond ETF (SPMB). 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	SPMB	Difference
Sharpe ratio: Return per unit of total volatility	—	1.29	—
Sortino ratio: Return per unit of downside risk	—	1.94	—
Omega ratio: Gain probability vs. loss probability	—	1.24	—
Calmar ratio: Return relative to maximum drawdown	—	1.89	—
Martin ratio: Return relative to average drawdown	—	5.85	—

Drawdowns

ASEC vs. SPMB - Drawdown Comparison

The maximum ASEC drawdown since its inception was -0.46%, smaller than the maximum SPMB drawdown of -18.03%. Use the drawdown chart below to compare losses from any high point for ASEC and SPMB.

Drawdown Indicators

	ASEC	SPMB	Difference
Max Drawdown Largest peak-to-trough decline	-0.46%	-18.03%	+17.57%
Max Drawdown (1Y) Largest decline over 1 year	—	-2.89%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-7.65%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-17.49%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-18.03%	—
Current Drawdown Current decline from peak	0.00%	-1.49%	+1.49%
Average Drawdown Average peak-to-trough decline	-0.19%	-2.84%	+2.65%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.93%	—

Volatility

Volatility by Period

	ASEC	SPMB	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	1.38%	—
Volatility (6M) Calculated over the trailing 6-month period	—	3.27%	—
Volatility (1Y) Calculated over the trailing 1-year period	1.39%	4.23%	-2.84%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.39%	6.80%	-5.41%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.39%	7.62%	-6.23%

ASEC vs. SPMB - Expense Ratio Comparison

ASEC has a 0.29% expense ratio, which is higher than SPMB's 0.04% expense ratio.

Dividends

ASEC vs. SPMB - Dividend Comparison

ASEC's dividend yield for the trailing twelve months is around 0.45%, less than SPMB's 4.11% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ASEC American Century Securitized Credit ETF	0.45%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
SPMB SPDR Portfolio Mortgage Backed Bond ETF	4.11%	3.98%	3.76%	3.21%	2.98%	2.59%	2.95%	3.24%	3.36%	3.13%	2.99%	3.05%

Frequently Asked Questions

Can I hold both ASEC and SPMB in my portfolio?

ASEC and SPMB have a correlation of 0.18, 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 SPMB?

On fees, SPMB is cheaper at 0.04% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, ASEC or SPMB?

SPMB is cheaper with a 0.04% expense ratio, compared with 0.29% for ASEC.

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

SPMB has the higher dividend yield at 4.11%, compared with 0.45% for ASEC.

What is the main difference between ASEC and SPMB?

They also come from different issuers: American Century and State Street. Their fees differ too: 0.29% for ASEC and 0.04% for SPMB.