FNILX vs. FSTZX

Last updated Jun 4, 2026

FNILX (Fidelity ZERO Large Cap Index Fund) and FSTZX (Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund) are both mutual funds - FNILX is a Large Cap Blend Equities fund managed by Fidelity, while FSTZX is a Inflation-Protected Bonds fund managed by Fidelity. Over the past 3 years, FNILX returned 23.01%/yr vs 5.30%/yr for FSTZX. At a 0.14 correlation, their price movements are largely independent. Both charge a 0.00% expense ratio.

Performance

FNILX vs. FSTZX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity ZERO Large Cap Index Fund (FNILX) and Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund (FSTZX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FNILX achieves a 11.56% return, which is significantly higher than FSTZX's 2.09% return.

FNILX

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

FSTZX

• 1D: 0.00%
• 1M: 0.00%
• YTD: 2.09%
• 6M: 2.02%
• 1Y: 4.67%
• 3Y*: 5.30%
• 5Y*: —
• 10Y*: —

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

FNILX vs. FSTZX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
FNILX Fidelity ZERO Large Cap Index Fund	11.56%	17.81%	25.47%	27.45%	-19.37%	6.22%
FSTZX Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund	2.09%	5.99%	4.87%	4.67%	-2.83%	1.32%

Correlation

The correlation between FNILX and FSTZX is -0.03, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.03
Correlation (3Y) Calculated over the trailing 3-year period	0.10
Correlation (All Time) Calculated using the full available price history since Aug 17, 2021	0.14

The correlation between FNILX and FSTZX shifts across timeframes, from -0.03 (1 year) to 0.14 (all time), reflecting how their relationship changes across market environments.

Return for Risk

FNILX vs. FSTZX — Risk / Return Rank

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

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

FSTZX

FSTZX Risk / Return Rank: 93
FSTZX Sharpe Ratio Rank: 88
FSTZX Sortino Ratio Rank: 93
FSTZX Omega Ratio Rank: 90
FSTZX Calmar Ratio Rank: 97
FSTZX Martin Ratio Rank: 96

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.

FNILX vs. FSTZX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity ZERO Large Cap Index Fund (FNILX) and Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund (FSTZX). 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.

	FNILX	FSTZX	Difference
Sharpe ratio: Return per unit of total volatility	2.48	2.86	-0.38
Sortino ratio: Return per unit of downside risk	3.36	4.65	-1.29
Omega ratio: Gain probability vs. loss probability	1.45	1.65	-0.20
Calmar ratio: Return relative to maximum drawdown	3.28	6.68	-3.39
Martin ratio: Return relative to average drawdown	15.01	24.52	-9.50
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FNILX vs. FSTZX - Sharpe Ratio Comparison

The current FNILX Sharpe Ratio is 2.48, which is comparable to the FSTZX Sharpe Ratio of 2.86. The chart below compares the historical Sharpe Ratios of FNILX and FSTZX, 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

	FNILX	FSTZX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.48	2.86	-0.38
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.82	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.76	1.20	-0.44

Drawdowns

FNILX vs. FSTZX - Drawdown Comparison

The maximum FNILX drawdown since its inception was -33.76%, which is greater than FSTZX's maximum drawdown of -5.30%. Use the drawdown chart below to compare losses from any high point for FNILX and FSTZX.

Drawdown Indicators

	FNILX	FSTZX	Difference
Max Drawdown Largest peak-to-trough decline	-33.76%	-5.30%	-28.46%
Max Drawdown (1Y) Largest decline over 1 year	-9.01%	-0.70%	-8.31%
Max Drawdown (3Y) Largest decline over 3 years	-19.08%	-1.03%	-18.05%
Max Drawdown (5Y) Largest decline over 5 years	-25.40%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-5.37%	-1.09%	-4.28%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.97%	0.19%	+1.78%

Volatility

FNILX vs. FSTZX - Volatility Comparison

Fidelity ZERO Large Cap Index Fund (FNILX) has a higher volatility of 2.88% compared to Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund (FSTZX) at 0.51%. This indicates that FNILX's price experiences larger fluctuations and is considered to be riskier than FSTZX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FNILX	FSTZX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.88%	0.51%	+2.37%
Volatility (6M) Calculated over the trailing 6-month period	8.99%	1.09%	+7.90%
Volatility (1Y) Calculated over the trailing 1-year period	11.93%	1.64%	+10.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.25%	2.79%	+14.46%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.04%	2.79%	+17.25%

FNILX vs. FSTZX - Expense Ratio Comparison

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

FNILX vs. FSTZX - Dividend Comparison

FNILX's dividend yield for the trailing twelve months is around 0.91%, less than FSTZX's 3.64% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018
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%
FSTZX Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund	3.64%	4.02%	2.78%	2.54%	5.25%	0.82%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FNILX and FSTZX in my portfolio?

FNILX and FSTZX have a correlation of -0.03, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FNILX or FSTZX?

FNILX has higher volatility (2.88%) compared to FSTZX (0.51%). In terms of maximum drawdown, FNILX dropped -33.76% vs FSTZX's -5.30%.

Which has better risk-adjusted returns?

FSTZX currently has the higher Sharpe Ratio (2.86 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.