SMBS vs. MBSD

Last updated Jun 4, 2026

SMBS (Schwab Mortgage-Backed Securities ETF) and MBSD (FlexShares Disciplined Duration MBS Index Fund) are both Mortgage Backed Securities funds - SMBS tracks the Bloomberg US MBS Float Adjusted Total Return Index while MBSD tracks the ICE BofA Constrained Duration US Mortgage Backed Securities. Both are passively managed. Over the past year, SMBS returned 6.78% vs 5.26% for MBSD. Their correlation of 0.87 suggests significant overlap in exposure. SMBS charges 0.03%/yr vs 0.20%/yr for MBSD.

Performance

SMBS vs. MBSD - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Schwab Mortgage-Backed Securities ETF (SMBS) and FlexShares Disciplined Duration MBS Index Fund (MBSD). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SMBS achieves a 0.70% return, which is significantly higher than MBSD's 0.42% return.

SMBS

• 1D: -0.24%
• 1M: 0.33%
• YTD: 0.70%
• 6M: 0.82%
• 1Y: 6.78%
• 3Y*: —
• 5Y*: —
• 10Y*: —

MBSD

• 1D: -0.22%
• 1M: 0.16%
• YTD: 0.42%
• 6M: 0.52%
• 1Y: 5.26%
• 3Y*: 4.31%
• 5Y*: 0.62%
• 10Y*: 1.37%

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

SMBS vs. MBSD - Yearly Performance Comparison

	2026 (YTD)	2025	2024
SMBS Schwab Mortgage-Backed Securities ETF	0.70%	8.15%	-0.07%
MBSD FlexShares Disciplined Duration MBS Index Fund	0.42%	7.12%	0.10%

Correlation

The correlation between SMBS and MBSD is 0.84, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.84
Correlation (All Time) Calculated using the full available price history since Nov 20, 2024	0.87

The correlation between SMBS and MBSD has been stable across timeframes, ranging from 0.84 to 0.87 - a consistent structural relationship.

Return for Risk

SMBS vs. MBSD — Risk / Return Rank

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

SMBS

SMBS Risk / Return Rank: 48
SMBS Sharpe Ratio Rank: 47
SMBS Sortino Ratio Rank: 49
SMBS Omega Ratio Rank: 47
SMBS Calmar Ratio Rank: 49
SMBS Martin Ratio Rank: 49

MBSD

MBSD Risk / Return Rank: 45
MBSD Sharpe Ratio Rank: 42
MBSD Sortino Ratio Rank: 44
MBSD Omega Ratio Rank: 42
MBSD Calmar Ratio Rank: 49
MBSD Martin Ratio Rank: 47

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.

SMBS vs. MBSD - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Schwab Mortgage-Backed Securities ETF (SMBS) and FlexShares Disciplined Duration MBS Index Fund (MBSD). 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.

	SMBS	MBSD	Difference
Sharpe ratio Return per unit of total volatility	1.64	1.50	+0.14
Sortino ratio Return per unit of downside risk	2.42	2.22	+0.20
Omega ratio Gain probability vs. loss probability	1.30	1.27	+0.03
Calmar ratio Return relative to maximum drawdown	2.41	2.43	-0.02
Martin ratio Return relative to average drawdown	8.21	7.71	+0.50
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SMBS vs. MBSD - Sharpe Ratio Comparison

The current SMBS Sharpe Ratio is 1.64, which is comparable to the MBSD Sharpe Ratio of 1.50. The chart below compares the historical Sharpe Ratios of SMBS and MBSD, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	SMBS	MBSD	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.64	1.50	+0.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.12	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.32	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.18	0.38	+0.80

Drawdowns

SMBS vs. MBSD - Drawdown Comparison

The maximum SMBS drawdown since its inception was -3.20%, smaller than the maximum MBSD drawdown of -14.36%. Use the drawdown chart below to compare losses from any high point for SMBS and MBSD.

Drawdown Indicators

	SMBS	MBSD	Difference
Max Drawdown Largest peak-to-trough decline	-3.20%	-14.36%	+11.16%
Max Drawdown (1Y) Largest decline over 1 year	-2.83%	-2.17%	-0.66%
Max Drawdown (3Y) Largest decline over 3 years	—	-4.68%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-14.10%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-14.36%	—
Current Drawdown Current decline from peak	-1.33%	-1.19%	-0.14%
Average Drawdown Average peak-to-trough decline	-0.84%	-2.81%	+1.97%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.83%	0.68%	+0.15%

Volatility

SMBS vs. MBSD - Volatility Comparison

Schwab Mortgage-Backed Securities ETF (SMBS) has a higher volatility of 1.55% compared to FlexShares Disciplined Duration MBS Index Fund (MBSD) at 1.15%. This indicates that SMBS's price experiences larger fluctuations and is considered to be riskier than MBSD based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SMBS	MBSD	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.55%	1.15%	+0.40%
Volatility (6M) Calculated over the trailing 6-month period	3.03%	2.47%	+0.56%
Volatility (1Y) Calculated over the trailing 1-year period	4.15%	3.53%	+0.62%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.86%	5.15%	-0.29%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.86%	4.26%	+0.60%

SMBS vs. MBSD - Expense Ratio Comparison

SMBS has a 0.03% expense ratio, which is lower than MBSD's 0.20% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

SMBS vs. MBSD - Dividend Comparison

SMBS's dividend yield for the trailing twelve months is around 5.17%, more than MBSD's 4.19% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
MBSD FlexShares Disciplined Duration MBS Index Fund	4.19%	4.23%	3.91%	3.39%	3.03%	2.41%	2.78%	3.42%	3.22%	3.30%	3.02%	3.46%
SMBS Schwab Mortgage-Backed Securities ETF	5.17%	4.83%	0.50%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both SMBS and MBSD in my portfolio?

SMBS and MBSD have a correlation of 0.84, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SMBS or MBSD?

SMBS has higher volatility (1.55%) compared to MBSD (1.15%). In terms of maximum drawdown, SMBS dropped -3.20% vs MBSD's -14.36%.

Which ETF is better, SMBS or MBSD?

On 1-year performance, SMBS leads with 6.78% vs 5.26% for MBSD. On fees, SMBS is cheaper at 0.03% per year. On volatility, MBSD has been the lower-risk option at 1.15%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, SMBS or MBSD?

Over the 1-year period, SMBS has performed better with a 6.78% return vs 5.26%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, SMBS or MBSD?

SMBS is cheaper with a 0.03% expense ratio, compared with 0.20% for MBSD.

Which ETF pays a higher dividend yield, SMBS or MBSD?

SMBS has the higher dividend yield at 5.17%, compared with 4.19% for MBSD.

What is the main difference between SMBS and MBSD?

SMBS tracks Bloomberg US MBS Float Adjusted Total Return Index, while MBSD tracks ICE BofA Constrained Duration US Mortgage Backed Securities. They also come from different issuers: Charles Schwab and Northern Trust. Their fees differ too: 0.03% for SMBS and 0.20% for MBSD.

Which has better risk-adjusted returns?

SMBS currently has the higher Sharpe Ratio (1.64 vs 1.50), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.