SPMB vs. ASEC
SPMB (SPDR Portfolio Mortgage Backed Bond ETF) and ASEC (American Century Securitized Credit ETF) are both Mortgage Backed Securities funds. SPMB is passively managed, while ASEC is actively managed. At a 0.20 correlation, their price movements are largely independent. SPMB charges 0.04%/yr vs 0.29%/yr for ASEC.
Performance
SPMB vs. ASEC - Performance Comparison
Loading charts...
Returns By Period
SPMB
- 1D
- -0.45%
- 1M
- -0.81%
- 6M
- -0.45%
- YTD
- 0.11%
- 1Y
- 4.91%
- 3Y*
- 4.12%
- 5Y*
- 0.19%
- 10Y*
- 1.15%
ASEC
- 1D
- -0.04%
- 1M
- 0.09%
- 6M
- —
- YTD
- —
- 1Y
- —
- 3Y*
- —
- 5Y*
- —
- 10Y*
- —
SPMB vs. ASEC - Yearly Performance Comparison
| 2026 (YTD) | |
|---|---|
SPMB SPDR Portfolio Mortgage Backed Bond ETF | -0.36% |
ASEC American Century Securitized Credit ETF | -0.09% |
Correlation
The correlation between SPMB and ASEC is 0.20, 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 | 0.20 |
Compare stocks, funds, or ETFs
Search for stocks, ETFs, and funds for a quick comparison or use the comparison tool for more options.
Return for Risk
SPMB vs. ASEC — Risk / Return Rank
SPMB
ASEC
Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.
SPMB vs. ASEC - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for SPDR Portfolio Mortgage Backed Bond ETF (SPMB) and American Century Securitized Credit ETF (ASEC). 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.
| SPMB | ASEC | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | — | — | |
| Sortino ratioReturn per unit of downside risk | — | — | |
| Omega ratioGain probability vs. loss probability | 1.21 | — | — |
| Calmar ratioReturn relative to maximum drawdown | 1.71 | — | — |
| Martin ratioReturn relative to average drawdown | 5.19 | — | — |
Loading charts...
Drawdowns
SPMB vs. ASEC - Drawdown Comparison
The maximum SPMB drawdown since its inception was -18.03%, which is greater than ASEC's maximum drawdown of -0.46%. Use the drawdown chart below to compare losses from any high point for SPMB and ASEC.
Loading charts...
Drawdown Indicators
| SPMB | ASEC | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.03% | -0.46% | -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 DrawdownCurrent decline from peak | -1.98% | -0.19% | -1.79% |
Average DrawdownAverage peak-to-trough decline | -2.84% | -0.19% | -2.65% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.95% | — | — |
Volatility
SPMB vs. ASEC - Volatility Comparison
Loading charts...
Volatility by Period
| SPMB | ASEC | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.36% | — | — |
Volatility (6M)Calculated over the trailing 6-month period | 3.28% | — | — |
Volatility (1Y)Calculated over the trailing 1-year period | 4.21% | 1.44% | +2.77% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.80% | 1.44% | +5.36% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 7.62% | 1.44% | +6.18% |
SPMB vs. ASEC - Expense Ratio Comparison
SPMB has a 0.04% expense ratio, which is lower than ASEC's 0.29% expense ratio.
Dividends
SPMB vs. ASEC - Dividend Comparison
SPMB's dividend yield for the trailing twelve months is around 4.13%, more than ASEC's 0.46% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ASEC American Century Securitized Credit ETF | 0.46% | 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 | 4.13% | 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
SPMB and ASEC have a correlation of 0.20, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
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.
SPMB is cheaper with a 0.04% expense ratio, compared with 0.29% for ASEC.
SPMB has the higher dividend yield at 4.13%, compared with 0.46% for ASEC.
They also come from different issuers: State Street and American Century. Their fees differ too: 0.04% for SPMB and 0.29% for ASEC.
Find the right allocation for SPMB and ASEC
Add both to a portfolio and optimize allocations for your target — whether that's maximizing returns, minimizing drawdowns, or balancing risk across holdings.
Open Portfolio Optimizer