FNDSX vs. VTBNX
FNDSX (Fidelity Sustainability Bond Index Fund) and VTBNX (Vanguard Total Bond Market II Index Fund) are both Total Bond Market funds. Over the past 5 years, FNDSX returned -0.14%/yr vs 0.01%/yr for VTBNX. With a 0.97 correlation, they move nearly in lockstep. FNDSX charges 0.10%/yr vs 0.02%/yr for VTBNX.
Performance
FNDSX vs. VTBNX - Performance Comparison
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Returns By Period
In the year-to-date period, FNDSX achieves a 0.10% return, which is significantly higher than VTBNX's 0.01% return.
FNDSX
- 1D
- -0.32%
- 1M
- 0.55%
- YTD
- 0.10%
- 6M
- 0.42%
- 1Y
- 4.12%
- 3Y*
- 3.80%
- 5Y*
- -0.14%
- 10Y*
- —
VTBNX
- 1D
- -0.32%
- 1M
- 0.56%
- YTD
- 0.01%
- 6M
- 0.45%
- 1Y
- 4.11%
- 3Y*
- 3.90%
- 5Y*
- 0.01%
- 10Y*
- 1.47%
FNDSX vs. VTBNX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | |
|---|---|---|---|---|---|---|---|---|---|
FNDSX Fidelity Sustainability Bond Index Fund | 0.10% | 7.03% | 1.23% | 5.44% | -13.34% | -2.22% | 6.95% | 8.30% | 1.89% |
VTBNX Vanguard Total Bond Market II Index Fund | 0.01% | 7.18% | 1.32% | 5.68% | -13.12% | -1.82% | 7.39% | 8.71% | 2.19% |
Correlation
The correlation between FNDSX and VTBNX is 0.96 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.96 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.97 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.98 |
Correlation (All Time) Calculated using the full available price history since Jun 19, 2018 | 0.97 |
The correlation between FNDSX and VTBNX has been stable across timeframes, ranging from 0.96 to 0.98 - a consistent structural relationship.
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Return for Risk
FNDSX vs. VTBNX — Risk / Return Rank
FNDSX
VTBNX
FNDSX vs. VTBNX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for Fidelity Sustainability Bond Index Fund (FNDSX) and Vanguard Total Bond Market II Index Fund (VTBNX). 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.
| FNDSX | VTBNX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.01 | ||
| Sortino ratioReturn per unit of downside risk | -0.04 | ||
| Omega ratioGain probability vs. loss probability | 1.20 | 1.19 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 1.48 | 1.54 | -0.05 |
| Martin ratioReturn relative to average drawdown | 4.17 | 4.30 | -0.13 |
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Drawdowns
FNDSX vs. VTBNX - Drawdown Comparison
The maximum FNDSX drawdown since its inception was -19.72%, which is greater than VTBNX's maximum drawdown of -18.71%. Use the drawdown chart below to compare losses from any high point for FNDSX and VTBNX.
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Drawdown Indicators
| FNDSX | VTBNX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -19.72% | -18.71% | -1.01% |
Max Drawdown (1Y)Largest decline over 1 year | -2.94% | -2.83% | -0.11% |
Max Drawdown (3Y)Largest decline over 3 years | -6.11% | -5.97% | -0.14% |
Max Drawdown (5Y)Largest decline over 5 years | -18.30% | -18.05% | -0.25% |
Max Drawdown (10Y)Largest decline over 10 years | — | -18.71% | — |
Current DrawdownCurrent decline from peak | -4.06% | -2.52% | -1.54% |
Average DrawdownAverage peak-to-trough decline | -6.48% | -4.86% | -1.62% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.04% | 1.01% | +0.03% |
Volatility
FNDSX vs. VTBNX - Volatility Comparison
Fidelity Sustainability Bond Index Fund (FNDSX) has a higher volatility of 1.20% compared to Vanguard Total Bond Market II Index Fund (VTBNX) at 1.13%. This indicates that FNDSX's price experiences larger fluctuations and is considered to be riskier than VTBNX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| FNDSX | VTBNX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.20% | 1.13% | +0.07% |
Volatility (6M)Calculated over the trailing 6-month period | 2.89% | 2.86% | +0.03% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.92% | 3.88% | +0.04% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.01% | 5.96% | +0.05% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.30% | 4.93% | +0.37% |
FNDSX vs. VTBNX - Expense Ratio Comparison
FNDSX has a 0.10% expense ratio, which is higher than VTBNX's 0.02% 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
FNDSX vs. VTBNX - Dividend Comparison
FNDSX's dividend yield for the trailing twelve months is around 3.97%, less than VTBNX's 4.07% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|---|---|---|---|---|---|---|---|---|---|---|---|
FNDSX Fidelity Sustainability Bond Index Fund | 3.97% | 3.84% | 3.53% | 2.84% | 1.55% | 1.17% | 1.79% | 3.17% | 1.56% | 0.00% | 0.00% |
VTBNX Vanguard Total Bond Market II Index Fund | 4.07% | 3.95% | 3.77% | 3.13% | 2.54% | 1.82% | 3.12% | 2.79% | 2.56% | 2.52% | 2.55% |
Frequently Asked Questions
With a correlation of 0.96, FNDSX and VTBNX 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.
FNDSX has higher volatility (1.20%) compared to VTBNX (1.13%). In terms of maximum drawdown, FNDSX dropped -19.72% vs VTBNX's -18.71%.
VTBNX currently has the higher Sharpe Ratio (1.12 vs 1.11), 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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