FIOOX vs. FNILX

Last updated Jun 4, 2026

FIOOX (Fidelity Series Large Cap Value Index Fund) and FNILX (Fidelity ZERO Large Cap Index Fund) are both mutual funds - FIOOX is a Large Cap Value Equities fund managed by Fidelity, while FNILX is a Large Cap Blend Equities fund managed by Fidelity. Over the past 5 years, FIOOX returned 10.50%/yr vs 14.13%/yr for FNILX. Their correlation of 0.85 suggests significant overlap in exposure. Both charge a 0.00% expense ratio.

Performance

FIOOX vs. FNILX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Series Large Cap Value Index Fund (FIOOX) and Fidelity ZERO Large Cap Index Fund (FNILX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FIOOX achieves a 14.32% return, which is significantly higher than FNILX's 11.56% return.

FIOOX

• 1D: 0.77%
• 1M: 4.25%
• YTD: 14.32%
• 6M: 14.94%
• 1Y: 28.42%
• 3Y*: 18.65%
• 5Y*: 10.50%
• 10Y*: 11.18%

FNILX

• 1D: 0.26%
• 1M: 6.04%
• YTD: 11.56%
• 6M: 11.44%
• 1Y: 28.65%
• 3Y*: 23.01%
• 5Y*: 14.13%
• 10Y*: —

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

FIOOX vs. FNILX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
FIOOX Fidelity Series Large Cap Value Index Fund	14.32%	15.95%	14.34%	11.60%	-7.56%	25.23%	2.85%	26.57%	-11.81%
FNILX Fidelity ZERO Large Cap Index Fund	11.56%	17.81%	25.47%	27.45%	-19.37%	26.67%	21.13%	31.79%	-13.60%

Correlation

The correlation between FIOOX and FNILX is 0.79, 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	0.79
Correlation (3Y) Calculated over the trailing 3-year period	0.76
Correlation (5Y) Calculated over the trailing 5-year period	0.84
Correlation (All Time) Calculated using the full available price history since Oct 1, 2018	0.85

The correlation between FIOOX and FNILX has been stable across timeframes, ranging from 0.76 to 0.85 - a consistent structural relationship.

Return for Risk

FIOOX vs. FNILX — Risk / Return Rank

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

FIOOX

FIOOX Risk / Return Rank: 83
FIOOX Sharpe Ratio Rank: 84
FIOOX Sortino Ratio Rank: 81
FIOOX Omega Ratio Rank: 74
FIOOX Calmar Ratio Rank: 88
FIOOX Martin Ratio Rank: 90

FNILX

FNILX Risk / Return Rank: 71
FNILX Sharpe Ratio Rank: 73
FNILX Sortino Ratio Rank: 65
FNILX Omega Ratio Rank: 64
FNILX Calmar Ratio Rank: 72
FNILX Martin Ratio Rank: 80

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.

FIOOX vs. FNILX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Series Large Cap Value Index Fund (FIOOX) and Fidelity ZERO Large Cap Index Fund (FNILX). 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.

	FIOOX	FNILX	Difference
Sharpe ratio: Return per unit of total volatility	2.71	2.48	+0.23
Sortino ratio: Return per unit of downside risk	3.81	3.36	+0.46
Omega ratio: Gain probability vs. loss probability	1.49	1.45	+0.04
Calmar ratio: Return relative to maximum drawdown	4.31	3.28	+1.03
Martin ratio: Return relative to average drawdown	18.02	15.01	+3.01
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FIOOX vs. FNILX - Sharpe Ratio Comparison

The current FIOOX Sharpe Ratio is 2.71, which is comparable to the FNILX Sharpe Ratio of 2.48. The chart below compares the historical Sharpe Ratios of FIOOX and FNILX, 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

	FIOOX	FNILX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.71	2.48	+0.23
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.71	0.82	-0.11
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.65	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.61	0.76	-0.15

Drawdowns

FIOOX vs. FNILX - Drawdown Comparison

The maximum FIOOX drawdown since its inception was -38.31%, which is greater than FNILX's maximum drawdown of -33.76%. Use the drawdown chart below to compare losses from any high point for FIOOX and FNILX.

Drawdown Indicators

	FIOOX	FNILX	Difference
Max Drawdown Largest peak-to-trough decline	-38.31%	-33.76%	-4.55%
Max Drawdown (1Y) Largest decline over 1 year	-6.80%	-9.01%	+2.21%
Max Drawdown (3Y) Largest decline over 3 years	-15.66%	-19.08%	+3.42%
Max Drawdown (5Y) Largest decline over 5 years	-19.02%	-25.40%	+6.38%
Max Drawdown (10Y) Largest decline over 10 years	-38.31%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-4.05%	-5.37%	+1.32%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.62%	1.97%	-0.35%

Volatility

FIOOX vs. FNILX - Volatility Comparison

Fidelity Series Large Cap Value Index Fund (FIOOX) has a higher volatility of 3.06% compared to Fidelity ZERO Large Cap Index Fund (FNILX) at 2.88%. This indicates that FIOOX's price experiences larger fluctuations and is considered to be riskier than FNILX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FIOOX	FNILX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.06%	2.88%	+0.18%
Volatility (6M) Calculated over the trailing 6-month period	8.16%	8.99%	-0.83%
Volatility (1Y) Calculated over the trailing 1-year period	10.82%	11.93%	-1.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.88%	17.25%	-2.37%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.38%	20.04%	-2.66%

FIOOX vs. FNILX - Expense Ratio Comparison

FIOOX has a 0.00% expense ratio, which is lower than FNILX's 0.00% 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

FIOOX vs. FNILX - Dividend Comparison

FIOOX's dividend yield for the trailing twelve months is around 3.09%, more than FNILX's 0.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FIOOX Fidelity Series Large Cap Value Index Fund	3.09%	3.66%	3.30%	4.31%	4.39%	6.12%	2.59%	6.82%	4.99%	1.74%	2.48%	6.77%
FNILX Fidelity ZERO Large Cap Index Fund	0.91%	1.01%	1.09%	1.34%	1.53%	0.95%	1.20%	1.17%	0.53%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FIOOX and FNILX in my portfolio?

FIOOX and FNILX have a correlation of 0.79, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FIOOX or FNILX?

FIOOX has higher volatility (3.06%) compared to FNILX (2.88%). In terms of maximum drawdown, FIOOX dropped -38.31% vs FNILX's -33.76%.

Which has better risk-adjusted returns?

FIOOX currently has the higher Sharpe Ratio (2.71 vs 2.48), 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.