FNSTX vs. VIIIX

Last updated Jun 4, 2026

FNSTX (Fidelity Infrastructure Fund) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - FNSTX is a Large Cap Blend Equities fund managed by Fidelity, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 5 years, FNSTX returned 10.72%/yr vs 14.42%/yr for VIIIX. A 0.70 correlation means they provide meaningful diversification when combined. FNSTX charges 1.00%/yr vs 0.02%/yr for VIIIX.

Performance

FNSTX vs. VIIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Infrastructure Fund (FNSTX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FNSTX achieves a 10.08% return, which is significantly lower than VIIIX's 11.70% return.

FNSTX

• 1D: 1.93%
• 1M: -2.07%
• YTD: 10.08%
• 6M: 9.33%
• 1Y: 26.54%
• 3Y*: 18.80%
• 5Y*: 10.72%
• 10Y*: —

VIIIX

• 1D: 0.13%
• 1M: 5.80%
• YTD: 11.70%
• 6M: 11.74%
• 1Y: 28.99%
• 3Y*: 23.17%
• 5Y*: 14.42%
• 10Y*: 15.74%

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

FNSTX vs. VIIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019
FNSTX Fidelity Infrastructure Fund	10.08%	27.42%	14.43%	8.44%	-7.59%	7.58%	12.80%	5.49%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	11.70%	17.87%	26.29%	25.79%	-18.14%	28.69%	18.41%	5.46%

Correlation

The correlation between FNSTX and VIIIX is 0.64, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.64
Correlation (3Y) Calculated over the trailing 3-year period	0.58
Correlation (5Y) Calculated over the trailing 5-year period	0.68
Correlation (All Time) Calculated using the full available price history since Nov 6, 2019	0.70

The correlation between FNSTX and VIIIX shifts across timeframes, from 0.58 (3 years) to 0.70 (all time), reflecting how their relationship changes across market environments.

Return for Risk

FNSTX vs. VIIIX — Risk / Return Rank

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

FNSTX

FNSTX Risk / Return Rank: 46
FNSTX Sharpe Ratio Rank: 37
FNSTX Sortino Ratio Rank: 32
FNSTX Omega Ratio Rank: 36
FNSTX Calmar Ratio Rank: 71
FNSTX Martin Ratio Rank: 55

VIIIX

VIIIX Risk / Return Rank: 73
VIIIX Sharpe Ratio Rank: 76
VIIIX Sortino Ratio Rank: 67
VIIIX Omega Ratio Rank: 67
VIIIX Calmar Ratio Rank: 74
VIIIX Martin Ratio Rank: 83

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.

FNSTX vs. VIIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Infrastructure Fund (FNSTX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). 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.

	FNSTX	VIIIX	Difference
Sharpe ratio: Return per unit of total volatility	1.77	2.52	-0.75
Sortino ratio: Return per unit of downside risk	2.36	3.42	-1.06
Omega ratio: Gain probability vs. loss probability	1.32	1.46	-0.14
Calmar ratio: Return relative to maximum drawdown	3.25	3.36	-0.11
Martin ratio: Return relative to average drawdown	11.01	15.69	-4.68
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FNSTX vs. VIIIX - Sharpe Ratio Comparison

The current FNSTX Sharpe Ratio is 1.77, which is comparable to the VIIIX Sharpe Ratio of 2.52. The chart below compares the historical Sharpe Ratios of FNSTX and VIIIX, 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

	FNSTX	VIIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.77	2.52	-0.75
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.71	0.86	-0.15
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.87	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.62	0.50	+0.13

Drawdowns

FNSTX vs. VIIIX - Drawdown Comparison

The maximum FNSTX drawdown since its inception was -35.82%, smaller than the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for FNSTX and VIIIX.

Drawdown Indicators

	FNSTX	VIIIX	Difference
Max Drawdown Largest peak-to-trough decline	-35.82%	-55.18%	+19.36%
Max Drawdown (1Y) Largest decline over 1 year	-8.43%	-8.90%	+0.47%
Max Drawdown (3Y) Largest decline over 3 years	-13.63%	-18.75%	+5.12%
Max Drawdown (5Y) Largest decline over 5 years	-21.97%	-24.50%	+2.53%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.79%	—
Current Drawdown Current decline from peak	-2.84%	0.00%	-2.84%
Average Drawdown Average peak-to-trough decline	-5.17%	-10.02%	+4.85%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.49%	1.90%	+0.59%

Volatility

FNSTX vs. VIIIX - Volatility Comparison

Fidelity Infrastructure Fund (FNSTX) has a higher volatility of 5.45% compared to Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) at 2.83%. This indicates that FNSTX's price experiences larger fluctuations and is considered to be riskier than VIIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FNSTX	VIIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.45%	2.83%	+2.62%
Volatility (6M) Calculated over the trailing 6-month period	12.63%	8.97%	+3.66%
Volatility (1Y) Calculated over the trailing 1-year period	15.51%	11.86%	+3.65%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.15%	16.89%	-1.74%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.77%	18.06%	+0.71%

FNSTX vs. VIIIX - Expense Ratio Comparison

FNSTX has a 1.00% expense ratio, which is higher than VIIIX's 0.02% expense ratio.

Dividends

FNSTX vs. VIIIX - Dividend Comparison

FNSTX's dividend yield for the trailing twelve months is around 3.80%, more than VIIIX's 2.41% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FNSTX Fidelity Infrastructure Fund	3.80%	4.16%	1.59%	1.85%	1.35%	0.63%	0.80%	0.36%	0.00%	0.00%	0.00%	0.00%
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares	2.41%	2.11%	3.66%	2.66%	3.39%	4.79%	3.07%	2.86%	2.45%	1.84%	2.38%	2.47%

Frequently Asked Questions

Can I hold both FNSTX and VIIIX in my portfolio?

FNSTX and VIIIX have a correlation of 0.64, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FNSTX or VIIIX?

FNSTX has higher volatility (5.45%) compared to VIIIX (2.83%). In terms of maximum drawdown, FNSTX dropped -35.82% vs VIIIX's -55.18%.

Which has better risk-adjusted returns?

VIIIX currently has the higher Sharpe Ratio (2.52 vs 1.77), 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.