FGDKX vs. FZROX

Last updated Jun 4, 2026

FGDKX (Fidelity Growth Discovery Fund Class K) and FZROX (Fidelity ZERO Total Market Index Fund) are both mutual funds - FGDKX is a Large Cap Growth Equities fund managed by Fidelity, while FZROX is a Large Cap Blend Equities fund managed by Fidelity. Over the past 5 years, FGDKX returned 15.21%/yr vs 13.30%/yr for FZROX. Their correlation of 0.93 suggests significant overlap in exposure. FGDKX charges 0.68%/yr vs 0.00%/yr for FZROX.

Performance

FGDKX vs. FZROX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Growth Discovery Fund Class K (FGDKX) 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, FGDKX achieves a 15.49% return, which is significantly higher than FZROX's 12.01% return.

FGDKX

• 1D: 0.42%
• 1M: 7.30%
• YTD: 15.49%
• 6M: 14.96%
• 1Y: 31.36%
• 3Y*: 25.62%
• 5Y*: 15.21%
• 10Y*: 19.23%

FZROX

• 1D: 0.23%
• 1M: 5.79%
• YTD: 12.01%
• 6M: 11.92%
• 1Y: 29.16%
• 3Y*: 22.49%
• 5Y*: 13.30%
• 10Y*: —

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

FGDKX vs. FZROX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
FGDKX Fidelity Growth Discovery Fund Class K	15.49%	15.23%	30.30%	35.73%	-24.34%	23.03%	43.54%	33.91%	-12.31%
FZROX Fidelity ZERO Total Market Index Fund	12.01%	17.23%	23.94%	26.20%	-19.21%	26.00%	20.51%	31.15%	-12.72%

Correlation

The correlation between FGDKX and FZROX is 0.92, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (All Time) Calculated using the full available price history since Aug 17, 2018	0.93

The correlation between FGDKX and FZROX has been stable across timeframes, ranging from 0.91 to 0.94 - a consistent structural relationship.

Return for Risk

FGDKX vs. FZROX — Risk / Return Rank

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

FGDKX

FGDKX Risk / Return Rank: 45
FGDKX Sharpe Ratio Rank: 46
FGDKX Sortino Ratio Rank: 41
FGDKX Omega Ratio Rank: 43
FGDKX Calmar Ratio Rank: 47
FGDKX Martin Ratio Rank: 48

FZROX

FZROX Risk / Return Rank: 72
FZROX Sharpe Ratio Rank: 72
FZROX Sortino Ratio Rank: 65
FZROX Omega Ratio Rank: 63
FZROX Calmar Ratio Rank: 75
FZROX 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.

FGDKX vs. FZROX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Growth Discovery Fund Class K (FGDKX) 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.

	FGDKX	FZROX	Difference
Sharpe ratio Return per unit of total volatility	1.98	2.47	-0.48
Sortino ratio Return per unit of downside risk	2.67	3.36	-0.69
Omega ratio Gain probability vs. loss probability	1.35	1.45	-0.09
Calmar ratio Return relative to maximum drawdown	2.59	3.39	-0.80
Martin ratio Return relative to average drawdown	9.89	15.66	-5.77
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FGDKX vs. FZROX - Sharpe Ratio Comparison

The current FGDKX Sharpe Ratio is 1.98, which is comparable to the FZROX Sharpe Ratio of 2.47. The chart below compares the historical Sharpe Ratios of FGDKX 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

	FGDKX	FZROX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.98	2.47	-0.48
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.75	0.77	-0.02
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.94	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.64	0.73	-0.09

Drawdowns

FGDKX vs. FZROX - Drawdown Comparison

The maximum FGDKX drawdown since its inception was -55.39%, which is greater than FZROX's maximum drawdown of -34.96%. Use the drawdown chart below to compare losses from any high point for FGDKX and FZROX.

Drawdown Indicators

	FGDKX	FZROX	Difference
Max Drawdown Largest peak-to-trough decline	-55.39%	-34.96%	-20.43%
Max Drawdown (1Y) Largest decline over 1 year	-12.51%	-8.89%	-3.62%
Max Drawdown (3Y) Largest decline over 3 years	-23.41%	-19.38%	-4.03%
Max Drawdown (5Y) Largest decline over 5 years	-29.75%	-25.12%	-4.63%
Max Drawdown (10Y) Largest decline over 10 years	-31.09%	—	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-8.67%	-5.51%	-3.16%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.27%	1.92%	+1.35%

Volatility

FGDKX vs. FZROX - Volatility Comparison

Fidelity Growth Discovery Fund Class K (FGDKX) has a higher volatility of 4.16% compared to Fidelity ZERO Total Market Index Fund (FZROX) at 2.99%. This indicates that FGDKX's price experiences larger fluctuations and is considered to be riskier than FZROX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FGDKX	FZROX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.16%	2.99%	+1.17%
Volatility (6M) Calculated over the trailing 6-month period	12.70%	9.22%	+3.48%
Volatility (1Y) Calculated over the trailing 1-year period	16.35%	12.22%	+4.13%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.37%	17.44%	+2.93%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.60%	20.13%	+0.47%

FGDKX vs. FZROX - Expense Ratio Comparison

FGDKX has a 0.68% expense ratio, which is higher than FZROX's 0.00% expense ratio.

Dividends

FGDKX vs. FZROX - Dividend Comparison

FGDKX's dividend yield for the trailing twelve months is around 1.43%, more than FZROX's 0.91% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FGDKX Fidelity Growth Discovery Fund Class K	1.43%	1.65%	12.82%	2.63%	3.69%	13.53%	9.71%	4.37%	5.13%	4.92%	0.15%	0.28%
FZROX Fidelity ZERO Total Market Index Fund	0.91%	1.02%	1.16%	1.36%	1.57%	1.25%	1.27%	1.51%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FGDKX and FZROX in my portfolio?

With a correlation of 0.92, FGDKX and FZROX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, FGDKX or FZROX?

FGDKX has higher volatility (4.16%) compared to FZROX (2.99%). In terms of maximum drawdown, FGDKX dropped -55.39% vs FZROX's -34.96%.

Which has better risk-adjusted returns?

FZROX currently has the higher Sharpe Ratio (2.47 vs 1.98), 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.