FDFIX vs. FOCSX

Last updated Jun 3, 2026

FDFIX (Fidelity Flex 500 Index Fund) and FOCSX (Fidelity Small Cap Growth K6 Fund) are both mutual funds - FDFIX is a Large Cap Blend Equities fund managed by Fidelity, while FOCSX is a Small Cap Growth Equities fund managed by Fidelity. Over the past 5 years, FDFIX returned 14.07%/yr vs 8.36%/yr for FOCSX. Their correlation of 0.83 suggests significant overlap in exposure. FDFIX charges 0.00%/yr vs 0.60%/yr for FOCSX.

Performance

FDFIX vs. FOCSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Flex 500 Index Fund (FDFIX) and Fidelity Small Cap Growth K6 Fund (FOCSX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FDFIX achieves a 11.29% return, which is significantly lower than FOCSX's 17.96% return.

FDFIX

• 1D: 0.28%
• 1M: 5.37%
• YTD: 11.29%
• 6M: 11.56%
• 1Y: 28.97%
• 3Y*: 22.53%
• 5Y*: 14.07%
• 10Y*: —

FOCSX

• 1D: -1.13%
• 1M: 3.12%
• YTD: 17.96%
• 6M: 17.81%
• 1Y: 39.14%
• 3Y*: 20.96%
• 5Y*: 8.36%
• 10Y*: —

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

FDFIX vs. FOCSX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FDFIX Fidelity Flex 500 Index Fund	11.29%	17.59%	25.06%	26.27%	-18.10%	28.69%	18.46%	31.47%	-4.45%	11.51%
FOCSX Fidelity Small Cap Growth K6 Fund	17.96%	11.33%	21.04%	19.62%	-25.01%	10.50%	37.44%	36.25%	-4.60%	16.21%

Correlation

The correlation between FDFIX and FOCSX is 0.82, 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	0.82
Correlation (3Y) Calculated over the trailing 3-year period	0.80
Correlation (5Y) Calculated over the trailing 5-year period	0.84
Correlation (All Time) Calculated using the full available price history since May 26, 2017	0.83

The correlation between FDFIX and FOCSX has been stable across timeframes, ranging from 0.80 to 0.84 - a consistent structural relationship.

Return for Risk

FDFIX vs. FOCSX — Risk / Return Rank

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

FDFIX

FDFIX Risk / Return Rank: 72
FDFIX Sharpe Ratio Rank: 74
FDFIX Sortino Ratio Rank: 65
FDFIX Omega Ratio Rank: 65
FDFIX Calmar Ratio Rank: 73
FDFIX Martin Ratio Rank: 81

FOCSX

FOCSX Risk / Return Rank: 48
FOCSX Sharpe Ratio Rank: 41
FOCSX Sortino Ratio Rank: 37
FOCSX Omega Ratio Rank: 35
FOCSX Calmar Ratio Rank: 63
FOCSX Martin Ratio Rank: 63

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.

FDFIX vs. FOCSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Flex 500 Index Fund (FDFIX) and Fidelity Small Cap Growth K6 Fund (FOCSX). 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.

	FDFIX	FOCSX	Difference
Sharpe ratio Return per unit of total volatility	2.49	1.88	+0.61
Sortino ratio Return per unit of downside risk	3.37	2.56	+0.81
Omega ratio Gain probability vs. loss probability	1.45	1.32	+0.13
Calmar ratio Return relative to maximum drawdown	3.34	3.08	+0.26
Martin ratio Return relative to average drawdown	15.29	12.44	+2.85
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FDFIX vs. FOCSX - Sharpe Ratio Comparison

The current FDFIX Sharpe Ratio is 2.49, which is higher than the FOCSX Sharpe Ratio of 1.88. The chart below compares the historical Sharpe Ratios of FDFIX and FOCSX, 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

	FDFIX	FOCSX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.49	1.88	+0.61
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.84	0.36	+0.48
Sharpe Ratio (All Time) Calculated using the full available price history	0.82	0.60	+0.23

Drawdowns

FDFIX vs. FOCSX - Drawdown Comparison

The maximum FDFIX drawdown since its inception was -33.77%, smaller than the maximum FOCSX drawdown of -38.79%. Use the drawdown chart below to compare losses from any high point for FDFIX and FOCSX.

Drawdown Indicators

	FDFIX	FOCSX	Difference
Max Drawdown Largest peak-to-trough decline	-33.77%	-38.79%	+5.02%
Max Drawdown (1Y) Largest decline over 1 year	-8.99%	-12.98%	+3.99%
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	-28.51%	+9.75%
Max Drawdown (5Y) Largest decline over 5 years	-24.51%	-38.79%	+14.28%
Current Drawdown Current decline from peak	0.00%	-1.21%	+1.21%
Average Drawdown Average peak-to-trough decline	-4.58%	-10.96%	+6.38%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.97%	3.21%	-1.24%

Volatility

FDFIX vs. FOCSX - Volatility Comparison

The current volatility for Fidelity Flex 500 Index Fund (FDFIX) is 2.92%, while Fidelity Small Cap Growth K6 Fund (FOCSX) has a volatility of 6.46%. This indicates that FDFIX experiences smaller price fluctuations and is considered to be less risky than FOCSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FDFIX	FOCSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.92%	6.46%	-3.54%
Volatility (6M) Calculated over the trailing 6-month period	9.05%	16.41%	-7.36%
Volatility (1Y) Calculated over the trailing 1-year period	11.98%	21.38%	-9.40%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.95%	23.48%	-6.53%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.59%	23.58%	-4.99%

FDFIX vs. FOCSX - Expense Ratio Comparison

FDFIX has a 0.00% expense ratio, which is lower than FOCSX's 0.60% expense ratio.

Dividends

FDFIX vs. FOCSX - Dividend Comparison

FDFIX's dividend yield for the trailing twelve months is around 1.03%, less than FOCSX's 2.33% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
FDFIX Fidelity Flex 500 Index Fund	1.03%	1.11%	1.26%	1.48%	1.70%	1.27%	1.52%	1.78%	2.16%	0.50%
FOCSX Fidelity Small Cap Growth K6 Fund	2.33%	2.74%	2.26%	0.23%	0.05%	31.03%	2.78%	0.00%	2.47%	0.09%

Frequently Asked Questions

Can I hold both FDFIX and FOCSX in my portfolio?

FDFIX and FOCSX have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FDFIX or FOCSX?

FOCSX has higher volatility (6.46%) compared to FDFIX (2.92%). In terms of maximum drawdown, FDFIX dropped -33.77% vs FOCSX's -38.79%.

Which has better risk-adjusted returns?

FDFIX currently has the higher Sharpe Ratio (2.49 vs 1.88), 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.