ASEC vs. MBB
ASEC (American Century Securitized Credit ETF) and MBB (iShares MBS Bond ETF) are both Mortgage Backed Securities funds. ASEC is actively managed, while MBB is passively managed. At a 0.19 correlation, their price movements are largely independent. ASEC charges 0.29%/yr vs 0.06%/yr for MBB.
Performance
ASEC vs. MBB - Performance Comparison
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Returns By Period
ASEC
- 1D
- 0.10%
- 1M
- 0.32%
- 6M
- —
- YTD
- —
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
MBB
- 1D
- -0.47%
- 1M
- 0.47%
- 6M
- 0.56%
- YTD
- 0.65%
- 1Y
- 5.53%
- 3Y*
- 4.95%
- 5Y*
- 0.32%
- 10Y*
- 1.23%
ASEC vs. MBB - Yearly Performance Comparison
| 2026 (YTD) | |
|---|---|
ASEC American Century Securitized Credit ETF | 0.10% |
MBB iShares MBS Bond ETF | 0.14% |
Correlation
The correlation between ASEC and MBB is 0.19, 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 | 0.19 |
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Return for Risk
ASEC vs. MBB — Risk / Return Rank
ASEC
Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.
MBB
ASEC vs. MBB - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for American Century Securitized Credit ETF (ASEC) and iShares MBS Bond ETF (MBB). 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 | MBB | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | — | — | |
| Sortino ratioReturn per unit of downside risk | — | — | |
| Omega ratioGain probability vs. loss probability | — | 1.22 | — |
| Calmar ratioReturn relative to maximum drawdown | — | 1.89 | — |
| Martin ratioReturn relative to average drawdown | — | 5.85 | — |
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Drawdowns
ASEC vs. MBB - Drawdown Comparison
The maximum ASEC drawdown since its inception was -0.46%, smaller than the maximum MBB drawdown of -17.64%. Use the drawdown chart below to compare losses from any high point for ASEC and MBB.
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Drawdown Indicators
| ASEC | MBB | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -0.46% | -17.64% | +17.18% |
Max Drawdown (1Y)Largest decline over 1 year | — | -2.94% | — |
Max Drawdown (3Y)Largest decline over 3 years | — | -7.68% | — |
Max Drawdown (5Y)Largest decline over 5 years | — | -17.19% | — |
Max Drawdown (10Y)Largest decline over 10 years | — | -17.64% | — |
Current DrawdownCurrent decline from peak | 0.00% | -1.45% | +1.45% |
Average DrawdownAverage peak-to-trough decline | -0.19% | -2.34% | +2.15% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | — | 0.95% | — |
Volatility
ASEC vs. MBB - Volatility Comparison
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Volatility by Period
| ASEC | MBB | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | — | 1.44% | — |
Volatility (6M)Calculated over the trailing 6-month period | — | 3.40% | — |
Volatility (1Y)Calculated over the trailing 1-year period | 1.39% | 4.45% | -3.06% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 1.39% | 6.84% | -5.45% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 1.39% | 5.32% | -3.93% |
ASEC vs. MBB - Expense Ratio Comparison
ASEC has a 0.29% expense ratio, which is higher than MBB's 0.06% expense ratio.
Dividends
ASEC vs. MBB - Dividend Comparison
ASEC's dividend yield for the trailing twelve months is around 0.45%, less than MBB's 4.29% 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% |
MBB iShares MBS Bond ETF | 4.29% | 4.21% | 3.94% | 3.40% | 2.31% | 1.05% | 2.10% | 2.77% | 2.64% | 2.23% | 2.58% | 2.66% |
Frequently Asked Questions
ASEC and MBB have a correlation of 0.19, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
On fees, MBB is cheaper at 0.06% per year. The better choice depends on whether you care most about return, fees, risk, or income.
MBB is cheaper with a 0.06% expense ratio, compared with 0.29% for ASEC.
MBB has the higher dividend yield at 4.29%, compared with 0.45% for ASEC.
They also come from different issuers: American Century and iShares. Their fees differ too: 0.29% for ASEC and 0.06% for MBB.
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