FNIDX vs. VCOBX

Last updated Jun 4, 2026

FNIDX (Fidelity International Sustainability Index Fd) and VCOBX (Vanguard Core Bond Fund Admiral Shares) are both mutual funds - FNIDX is a Foreign Large Cap Equities fund managed by Fidelity, while VCOBX is a Total Bond Market fund managed by Vanguard. Over the past 5 years, FNIDX returned 6.90%/yr vs 0.65%/yr for VCOBX. At a 0.08 correlation, their price movements are largely independent. FNIDX charges 0.20%/yr vs 0.10%/yr for VCOBX.

Performance

FNIDX vs. VCOBX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity International Sustainability Index Fd (FNIDX) and Vanguard Core Bond Fund Admiral Shares (VCOBX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FNIDX achieves a 11.27% return, which is significantly higher than VCOBX's 0.60% return.

FNIDX

• 1D: 0.89%
• 1M: 4.36%
• YTD: 11.27%
• 6M: 13.24%
• 1Y: 27.92%
• 3Y*: 17.30%
• 5Y*: 6.90%
• 10Y*: —

VCOBX

• 1D: 0.00%
• 1M: 0.56%
• YTD: 0.60%
• 6M: 0.47%
• 1Y: 5.73%
• 3Y*: 4.90%
• 5Y*: 0.65%
• 10Y*: 2.19%

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

FNIDX vs. VCOBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FNIDX Fidelity International Sustainability Index Fd	11.27%	29.80%	5.67%	14.65%	-18.89%	7.65%	12.98%	22.20%	-14.00%	12.96%
VCOBX Vanguard Core Bond Fund Admiral Shares	0.60%	7.73%	2.21%	6.39%	-13.13%	-1.51%	10.41%	9.64%	-0.85%	2.41%

Correlation

The correlation between FNIDX and VCOBX is 0.40, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.40
Correlation (3Y) Calculated over the trailing 3-year period	0.31
Correlation (5Y) Calculated over the trailing 5-year period	0.22
Correlation (All Time) Calculated using the full available price history since May 10, 2017	0.08

Over the past year, FNIDX and VCOBX have become more correlated (0.40) than their long-term average of 0.08, meaning their price movements have been converging.

Return for Risk

FNIDX vs. VCOBX — Risk / Return Rank

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

FNIDX

FNIDX Risk / Return Rank: 40
FNIDX Sharpe Ratio Rank: 40
FNIDX Sortino Ratio Rank: 37
FNIDX Omega Ratio Rank: 39
FNIDX Calmar Ratio Rank: 40
FNIDX Martin Ratio Rank: 43

VCOBX

VCOBX Risk / Return Rank: 31
VCOBX Sharpe Ratio Rank: 30
VCOBX Sortino Ratio Rank: 32
VCOBX Omega Ratio Rank: 30
VCOBX Calmar Ratio Rank: 34
VCOBX Martin Ratio Rank: 27

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.

FNIDX vs. VCOBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity International Sustainability Index Fd (FNIDX) and Vanguard Core Bond Fund Admiral Shares (VCOBX). 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.

	FNIDX	VCOBX	Difference
Sharpe ratio: Return per unit of total volatility	1.83	1.57	+0.26
Sortino ratio: Return per unit of downside risk	2.55	2.34	+0.22
Omega ratio: Gain probability vs. loss probability	1.33	1.29	+0.05
Calmar ratio: Return relative to maximum drawdown	2.40	2.20	+0.20
Martin ratio: Return relative to average drawdown	9.14	6.56	+2.57
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FNIDX vs. VCOBX - Sharpe Ratio Comparison

The current FNIDX Sharpe Ratio is 1.83, which is comparable to the VCOBX Sharpe Ratio of 1.57. The chart below compares the historical Sharpe Ratios of FNIDX and VCOBX, 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

	FNIDX	VCOBX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.83	1.57	+0.26
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.44	0.11	+0.33
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.46	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.50	0.48	+0.01

Drawdowns

FNIDX vs. VCOBX - Drawdown Comparison

The maximum FNIDX drawdown since its inception was -33.17%, which is greater than VCOBX's maximum drawdown of -18.14%. Use the drawdown chart below to compare losses from any high point for FNIDX and VCOBX.

Drawdown Indicators

	FNIDX	VCOBX	Difference
Max Drawdown Largest peak-to-trough decline	-33.17%	-18.14%	-15.03%
Max Drawdown (1Y) Largest decline over 1 year	-11.36%	-2.62%	-8.74%
Max Drawdown (3Y) Largest decline over 3 years	-14.92%	-5.63%	-9.29%
Max Drawdown (5Y) Largest decline over 5 years	-32.79%	-18.03%	-14.76%
Max Drawdown (10Y) Largest decline over 10 years	—	-18.14%	—
Current Drawdown Current decline from peak	0.00%	-1.25%	+1.25%
Average Drawdown Average peak-to-trough decline	-8.26%	-4.18%	-4.08%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.97%	0.88%	+2.09%

Volatility

FNIDX vs. VCOBX - Volatility Comparison

Fidelity International Sustainability Index Fd (FNIDX) has a higher volatility of 4.45% compared to Vanguard Core Bond Fund Admiral Shares (VCOBX) at 1.33%. This indicates that FNIDX's price experiences larger fluctuations and is considered to be riskier than VCOBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FNIDX	VCOBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.45%	1.33%	+3.12%
Volatility (6M) Calculated over the trailing 6-month period	12.32%	2.66%	+9.66%
Volatility (1Y) Calculated over the trailing 1-year period	14.88%	3.68%	+11.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.80%	5.78%	+10.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.55%	4.76%	+11.79%

FNIDX vs. VCOBX - Expense Ratio Comparison

FNIDX has a 0.20% expense ratio, which is higher than VCOBX's 0.10% 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

FNIDX vs. VCOBX - Dividend Comparison

FNIDX's dividend yield for the trailing twelve months is around 2.53%, less than VCOBX's 4.73% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
FNIDX Fidelity International Sustainability Index Fd	2.53%	2.81%	2.34%	2.64%	2.32%	1.93%	1.13%	2.17%	2.28%	1.27%	0.00%
VCOBX Vanguard Core Bond Fund Admiral Shares	4.73%	4.80%	5.04%	4.44%	3.01%	1.23%	3.09%	3.08%	3.10%	2.20%	2.29%

Frequently Asked Questions

Can I hold both FNIDX and VCOBX in my portfolio?

FNIDX and VCOBX have a correlation of 0.40, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FNIDX or VCOBX?

FNIDX has higher volatility (4.45%) compared to VCOBX (1.33%). In terms of maximum drawdown, FNIDX dropped -33.17% vs VCOBX's -18.14%.

Which has better risk-adjusted returns?

FNIDX currently has the higher Sharpe Ratio (1.83 vs 1.57), 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.