FSKAX vs. FZROX

Last updated Apr 10, 2026

FSKAX (Fidelity Total Market Index Fund) and FZROX (Fidelity ZERO Total Market Index Fund) are both Large Cap Blend Equities funds from Fidelity. Over the past 5 years, FSKAX returned 10.83%/yr vs 11.05%/yr for FZROX. With a 0.99 correlation, they move nearly in lockstep. FSKAX charges 0.01%/yr vs 0.00%/yr for FZROX.

Performance

FSKAX vs. FZROX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Total Market Index Fund (FSKAX) and Fidelity ZERO Total Market Index Fund (FZROX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FSKAX achieves a -0.18% return, which is significantly higher than FZROX's -0.21% return.

FSKAX

• 1D: 2.52%
• 1M: 0.37%
• YTD: -0.18%
• 6M: 1.40%
• 1Y: 26.46%
• 3Y*: 19.59%
• 5Y*: 10.83%
• 10Y*: 14.14%

FZROX

• 1D: 2.52%
• 1M: 0.34%
• YTD: -0.21%
• 6M: 1.49%
• 1Y: 26.55%
• 3Y*: 19.65%
• 5Y*: 11.05%
• 10Y*: —

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

FSKAX vs. FZROX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
FSKAX Fidelity Total Market Index Fund	-0.18%	17.06%	23.89%	26.12%	-19.53%	25.66%	20.79%	30.92%	-12.21%
FZROX Fidelity ZERO Total Market Index Fund	-0.21%	17.23%	23.94%	26.20%	-19.21%	26.00%	20.51%	31.15%	-12.72%

Correlation

The correlation between FSKAX and FZROX is 1.00 — 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	1.00
Correlation (3Y) Calculated over the trailing 3-year period	0.99
Correlation (5Y) Calculated over the trailing 5-year period	0.99
Correlation (All Time) Calculated using the full available price history since Aug 17, 2018	0.99

The correlation between FSKAX and FZROX has been stable across timeframes, ranging from 0.99 to 1.00 — a consistent structural relationship.

FSKAX vs. FZROX - Expense Ratio Comparison

FSKAX has a 0.02% expense ratio, which is higher than FZROX's 0.00% 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%.

Return for Risk

FSKAX vs. FZROX — Risk / Return Rank

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

FSKAX

FSKAX Risk / Return Rank: 77
FSKAX Sharpe Ratio Rank: 64
FSKAX Sortino Ratio Rank: 69
FSKAX Omega Ratio Rank: 69
FSKAX Calmar Ratio Rank: 91
FSKAX Martin Ratio Rank: 94

FZROX

FZROX Risk / Return Rank: 78
FZROX Sharpe Ratio Rank: 64
FZROX Sortino Ratio Rank: 70
FZROX Omega Ratio Rank: 70
FZROX Calmar Ratio Rank: 92
FZROX Martin Ratio Rank: 94

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.

FSKAX vs. FZROX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Total Market Index Fund (FSKAX) and Fidelity ZERO Total Market Index Fund (FZROX). 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.

	FSKAX	FZROX	Difference
Sharpe ratio Return per unit of total volatility	2.29	2.30	-0.01
Sortino ratio Return per unit of downside risk	3.62	3.63	-0.02
Omega ratio Gain probability vs. loss probability	1.50	1.50	0.00
Calmar ratio Return relative to maximum drawdown	4.02	4.04	-0.02
Martin ratio Return relative to average drawdown	17.73	17.90	-0.16
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FSKAX vs. FZROX - Sharpe Ratio Comparison

The current FSKAX Sharpe Ratio is 2.29, which is comparable to the FZROX Sharpe Ratio of 2.30. The chart below compares the historical Sharpe Ratios of FSKAX and FZROX, 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

	FSKAX	FZROX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.29	2.30	-0.01
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.62	0.64	-0.01
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.77	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.81	0.65	+0.15

Drawdowns

FSKAX vs. FZROX - Drawdown Comparison

The maximum FSKAX drawdown since its inception was -35.01%, roughly equal to the maximum FZROX drawdown of -34.96%. Use the drawdown chart below to compare losses from any high point for FSKAX and FZROX.

Drawdown Indicators

	FSKAX	FZROX	Difference
Max Drawdown Largest peak-to-trough decline	-35.01%	-34.96%	-0.05%
Max Drawdown (1Y) Largest decline over 1 year	-8.92%	-8.89%	-0.03%
Max Drawdown (5Y) Largest decline over 5 years	-25.39%	-25.12%	-0.27%
Max Drawdown (10Y) Largest decline over 10 years	-35.01%	—	—
Current Drawdown Current decline from peak	-2.49%	-2.48%	-0.01%
Average Drawdown Average peak-to-trough decline	-4.06%	-5.61%	+1.55%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.02%	2.01%	+0.01%

Volatility

FSKAX vs. FZROX - Volatility Comparison

Fidelity Total Market Index Fund (FSKAX) and Fidelity ZERO Total Market Index Fund (FZROX) have volatilities of 5.83% and 5.83%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FSKAX	FZROX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.83%	5.83%	0.00%
Volatility (6M) Calculated over the trailing 6-month period	10.18%	10.13%	+0.05%
Volatility (1Y) Calculated over the trailing 1-year period	17.12%	17.12%	0.00%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.44%	17.47%	-0.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.45%	20.27%	-1.82%

Dividends

FSKAX vs. FZROX - Dividend Comparison

FSKAX's dividend yield for the trailing twelve months is around 1.02%, which matches FZROX's 1.03% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FSKAX Fidelity Total Market Index Fund	1.02%	1.01%	1.19%	1.41%	1.62%	1.15%	1.45%	1.94%	2.54%	2.07%	2.43%	0.82%
FZROX Fidelity ZERO Total Market Index Fund	1.03%	1.02%	1.16%	1.36%	1.57%	1.25%	1.27%	1.51%	0.00%	0.00%	0.00%	0.00%