NUBD vs. MBB
NUBD (Nuveen ESG U.S. Aggregate Bond ETF) and MBB (iShares MBS Bond ETF) are both exchange-traded funds - NUBD is a Intermediate Core Bond fund tracking the Bloomberg MSCI U.S. Aggregate ESG Select Index, while MBB is a Mortgage Backed Securities fund tracking the Barclays Capital U.S. MBS Index. Both are passively managed. Over the past 5 years, NUBD returned -0.11%/yr vs 0.26%/yr for MBB. Their correlation of 0.83 suggests significant overlap in exposure. NUBD charges 0.15%/yr vs 0.06%/yr for MBB.
Performance
NUBD vs. MBB - Performance Comparison
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Returns By Period
In the year-to-date period, NUBD achieves a -0.02% return, which is significantly lower than MBB's 0.18% return.
NUBD
- 1D
- -0.39%
- 1M
- -0.25%
- YTD
- -0.02%
- 6M
- 0.18%
- 1Y
- 4.73%
- 3Y*
- 3.66%
- 5Y*
- -0.11%
- 10Y*
- —
MBB
- 1D
- -0.50%
- 1M
- -0.54%
- YTD
- 0.18%
- 6M
- 0.62%
- 1Y
- 6.60%
- 3Y*
- 4.14%
- 5Y*
- 0.26%
- 10Y*
- 1.26%
NUBD vs. MBB - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
NUBD Nuveen ESG U.S. Aggregate Bond ETF | -0.02% | 6.75% | 1.31% | 5.42% | -12.90% | -2.19% | 7.17% | 8.22% | 0.32% | 0.26% |
MBB iShares MBS Bond ETF | 0.18% | 8.38% | 1.31% | 5.01% | -11.74% | -1.43% | 4.08% | 6.18% | 0.82% | 0.05% |
Correlation
The correlation between NUBD and MBB is 0.91, 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 | 0.91 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.92 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.92 |
Correlation (All Time) Calculated using the full available price history since Oct 3, 2017 | 0.83 |
The correlation between NUBD and MBB has been stable across timeframes, ranging from 0.83 to 0.92 - a consistent structural relationship.
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Return for Risk
NUBD vs. MBB — Risk / Return Rank
NUBD
MBB
NUBD vs. MBB - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Nuveen ESG U.S. Aggregate Bond ETF (NUBD) 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.
| NUBD | MBB | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.23 | ||
| Sortino ratioReturn per unit of downside risk | -0.34 | ||
| Omega ratioGain probability vs. loss probability | 1.20 | 1.24 | -0.04 |
| Calmar ratioReturn relative to maximum drawdown | 1.54 | 2.06 | -0.52 |
| Martin ratioReturn relative to average drawdown | 4.54 | 6.74 | -2.21 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| NUBD | MBB | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.13 | 1.35 | -0.23 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | -0.02 | 0.04 | -0.06 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | — | 0.24 | — |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.28 | 0.58 | -0.30 |
Drawdowns
NUBD vs. MBB - Drawdown Comparison
The maximum NUBD drawdown since its inception was -19.45%, which is greater than MBB's maximum drawdown of -17.64%. Use the drawdown chart below to compare losses from any high point for NUBD and MBB.
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Drawdown Indicators
| NUBD | MBB | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -19.45% | -17.64% | -1.81% |
Max Drawdown (1Y)Largest decline over 1 year | -2.76% | -2.94% | +0.18% |
Max Drawdown (3Y)Largest decline over 3 years | -5.94% | -7.68% | +1.74% |
Max Drawdown (5Y)Largest decline over 5 years | -17.90% | -17.19% | -0.71% |
Max Drawdown (10Y)Largest decline over 10 years | — | -17.64% | — |
Current DrawdownCurrent decline from peak | -4.14% | -1.91% | -2.23% |
Average DrawdownAverage peak-to-trough decline | -6.05% | -2.35% | -3.70% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.94% | 0.90% | +0.04% |
Volatility
NUBD vs. MBB - Volatility Comparison
The current volatility for Nuveen ESG U.S. Aggregate Bond ETF (NUBD) is 1.21%, while iShares MBS Bond ETF (MBB) has a volatility of 1.57%. This indicates that NUBD experiences smaller price fluctuations and is considered to be less risky than MBB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| NUBD | MBB | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.21% | 1.57% | -0.36% |
Volatility (6M)Calculated over the trailing 6-month period | 2.64% | 3.26% | -0.62% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.77% | 4.49% | -0.72% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.99% | 6.81% | -0.82% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.12% | 5.31% | -0.19% |
NUBD vs. MBB - Expense Ratio Comparison
NUBD has a 0.15% expense ratio, which is higher than MBB's 0.06% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
NUBD vs. MBB - Dividend Comparison
NUBD's dividend yield for the trailing twelve months is around 4.00%, less than MBB's 4.29% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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% |
NUBD Nuveen ESG U.S. Aggregate Bond ETF | 4.00% | 3.90% | 3.51% | 2.99% | 2.83% | 2.05% | 2.21% | 2.66% | 3.08% | 0.58% | 0.00% | 0.00% |
Frequently Asked Questions
With a correlation of 0.91, NUBD and MBB move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.
MBB has higher volatility (1.57%) compared to NUBD (1.21%). In terms of maximum drawdown, NUBD dropped -19.45% vs MBB's -17.64%.
On 5-year performance, MBB leads with 0.26% vs -0.11% for NUBD. On fees, MBB is cheaper at 0.06% per year. On volatility, NUBD has been the lower-risk option at 1.21%. The better choice depends on whether you care most about return, fees, risk, or income.
Over the 5-year period, MBB has performed better with a 0.26% return vs -0.11%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.
MBB is cheaper with a 0.06% expense ratio, compared with 0.15% for NUBD.
MBB has the higher dividend yield at 4.29%, compared with 4.00% for NUBD.
NUBD is categorized as Intermediate Core Bond, while MBB is Mortgage Backed Securities. NUBD tracks Bloomberg MSCI U.S. Aggregate ESG Select Index, while MBB tracks Barclays Capital U.S. MBS Index. They also come from different issuers: Nuveen and iShares. Their fees differ too: 0.15% for NUBD and 0.06% for MBB.
MBB currently has the higher Sharpe Ratio (1.35 vs 1.13), 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.
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