ASEC vs. MBBA

Last updated Jul 18, 2026

ASEC (American Century Securitized Credit ETF) and MBBA (iShares Mortgage-Backed Securities Active ETF) are both Mortgage Backed Securities funds. Both are actively managed. At a 0.16 correlation, their price movements are largely independent. ASEC charges 0.29%/yr vs 0.25%/yr for MBBA.

Performance

ASEC vs. MBBA - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Securitized Credit ETF (ASEC) and iShares Mortgage-Backed Securities Active ETF (MBBA). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

ASEC

• 1D: 0.02%
• 1M: 0.27%
• 6M: —
• YTD: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

MBBA

• 1D: 0.03%
• 1M: -0.09%
• 6M: —
• YTD: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

ASEC vs. MBBA - Yearly Performance Comparison

	2026 (YTD)
ASEC American Century Securitized Credit ETF	0.11%
MBBA iShares Mortgage-Backed Securities Active ETF	0.29%

Correlation

The correlation between ASEC and MBBA is 0.16, 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	0.16

Return for Risk

ASEC vs. MBBA - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Securitized Credit ETF (ASEC) and iShares Mortgage-Backed Securities Active ETF (MBBA). 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.

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

Drawdowns

ASEC vs. MBBA - Drawdown Comparison

The maximum ASEC drawdown since its inception was -0.46%, smaller than the maximum MBBA drawdown of -2.83%. Use the drawdown chart below to compare losses from any high point for ASEC and MBBA.

Drawdown Indicators

	ASEC	MBBA	Difference
Max Drawdown Largest peak-to-trough decline	-0.46%	-2.83%	+2.37%
Current Drawdown Current decline from peak	0.00%	-1.24%	+1.24%
Average Drawdown Average peak-to-trough decline	-0.18%	-1.10%	+0.92%

Volatility

Volatility by Period

	ASEC	MBBA	Difference
Volatility (1Y) Calculated over the trailing 1-year period	1.46%	4.58%	-3.12%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.46%	4.58%	-3.12%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.46%	4.58%	-3.12%

ASEC vs. MBBA - Expense Ratio Comparison

ASEC has a 0.29% expense ratio, which is higher than MBBA's 0.25% expense ratio.

Dividends

ASEC vs. MBBA - Dividend Comparison

ASEC's dividend yield for the trailing twelve months is around 0.45%, less than MBBA's 2.21% yield.

Position	TTM
ASEC American Century Securitized Credit ETF	0.45%
MBBA iShares Mortgage-Backed Securities Active ETF	2.21%

Frequently Asked Questions

Can I hold both ASEC and MBBA in my portfolio?

ASEC and MBBA have a correlation of 0.16, 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 MBBA?

On fees, MBBA is cheaper at 0.25% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, ASEC or MBBA?

MBBA is cheaper with a 0.25% expense ratio, compared with 0.29% for ASEC.

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

MBBA has the higher dividend yield at 2.21%, compared with 0.45% for ASEC.

What is the main difference between ASEC and MBBA?

They also come from different issuers: American Century and iShares. Their fees differ too: 0.29% for ASEC and 0.25% for MBBA.