FDESX vs. FDFIX

Last updated Jun 23, 2026

FDESX (Fidelity Advisor Diversified Stock Fund Class O) and FDFIX (Fidelity Flex 500 Index Fund) are both mutual funds - FDESX is a Large Cap Growth Equities fund managed by Fidelity, while FDFIX is a Large Cap Blend Equities fund tracking the Fidelity U.S. Large Cap Index. Over the past 5 years, FDESX returned 14.27%/yr vs 14.02%/yr for FDFIX. With a 0.96 correlation, they move nearly in lockstep. FDESX charges 0.45%/yr vs 0.00%/yr for FDFIX.

Performance

FDESX vs. FDFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Advisor Diversified Stock Fund Class O (FDESX) and Fidelity Flex 500 Index Fund (FDFIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FDESX achieves a 14.64% return, which is significantly higher than FDFIX's 10.05% return.

FDESX

• 1D: 1.34%
• 1M: 2.57%
• YTD: 14.64%
• 6M: 13.87%
• 1Y: 31.43%
• 3Y*: 22.55%
• 5Y*: 14.27%
• 10Y*: 16.43%

FDFIX

• 1D: 1.14%
• 1M: 0.69%
• YTD: 10.05%
• 6M: 9.52%
• 1Y: 26.74%
• 3Y*: 20.85%
• 5Y*: 14.02%
• 10Y*: —

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

FDESX vs. FDFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FDESX Fidelity Advisor Diversified Stock Fund Class O	14.64%	14.07%	28.08%	28.34%	-19.86%	28.26%	27.46%	28.23%	-5.62%	12.07%
FDFIX Fidelity Flex 500 Index Fund	10.05%	17.59%	25.06%	26.27%	-18.10%	28.69%	18.46%	31.47%	-4.45%	14.41%

Correlation

The correlation between FDESX and FDFIX is 0.95 - 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	0.95
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (5Y) Calculated over the trailing 5-year period	0.96
Correlation (All Time) Calculated using the full available price history since Mar 9, 2017	0.96

The correlation between FDESX and FDFIX has been stable across timeframes, ranging from 0.95 to 0.96 - a consistent structural relationship.

Return for Risk

FDESX vs. FDFIX — Risk / Return Rank

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

FDESX

FDESX Risk / Return Rank: 62
FDESX Sharpe Ratio Rank: 57
FDESX Sortino Ratio Rank: 50
FDESX Omega Ratio Rank: 53
FDESX Calmar Ratio Rank: 72
FDESX Martin Ratio Rank: 77

FDFIX

FDFIX Risk / Return Rank: 63
FDFIX Sharpe Ratio Rank: 61
FDFIX Sortino Ratio Rank: 55
FDFIX Omega Ratio Rank: 57
FDFIX Calmar Ratio Rank: 65
FDFIX Martin Ratio Rank: 74

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.

FDESX vs. FDFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Advisor Diversified Stock Fund Class O (FDESX) and Fidelity Flex 500 Index Fund (FDFIX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	FDESX	FDFIX	Difference
Sharpe ratio: Return per unit of total volatility	2.05	2.12	-0.07
Sortino ratio: Return per unit of downside risk	2.73	2.86	-0.13
Omega ratio: Gain probability vs. loss probability	1.37	1.38	-0.01
Calmar ratio: Return relative to maximum drawdown	3.13	2.97	+0.16
Martin ratio: Return relative to average drawdown	13.47	13.11	+0.35

FDESX vs. FDFIX - Sharpe Ratio Comparison

The current FDESX Sharpe Ratio is 2.05, which is comparable to the FDFIX Sharpe Ratio of 2.12. The chart below compares the historical Sharpe Ratios of FDESX and FDFIX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

FDESX vs. FDFIX - Drawdown Comparison

The maximum FDESX drawdown since its inception was -65.36%, which is greater than FDFIX's maximum drawdown of -33.77%. Use the drawdown chart below to compare losses from any high point for FDESX and FDFIX.

Drawdown Indicators

	FDESX	FDFIX	Difference
Max Drawdown Largest peak-to-trough decline	-65.36%	-33.77%	-31.59%
Max Drawdown (1Y) Largest decline over 1 year	-9.99%	-8.99%	-1.00%
Max Drawdown (3Y) Largest decline over 3 years	-27.06%	-18.76%	-8.30%
Max Drawdown (5Y) Largest decline over 5 years	-27.06%	-24.51%	-2.55%
Max Drawdown (10Y) Largest decline over 10 years	-30.39%	—	—
Current Drawdown Current decline from peak	-0.36%	-1.33%	+0.97%
Average Drawdown Average peak-to-trough decline	-14.03%	-4.56%	-9.47%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.32%	2.03%	+0.29%

Volatility

FDESX vs. FDFIX - Volatility Comparison

Fidelity Advisor Diversified Stock Fund Class O (FDESX) has a higher volatility of 6.26% compared to Fidelity Flex 500 Index Fund (FDFIX) at 4.90%. This indicates that FDESX's price experiences larger fluctuations and is considered to be riskier than FDFIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FDESX	FDFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.26%	4.90%	+1.36%
Volatility (6M) Calculated over the trailing 6-month period	12.42%	10.00%	+2.42%
Volatility (1Y) Calculated over the trailing 1-year period	15.26%	12.61%	+2.65%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.84%	17.05%	+2.79%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.63%	18.60%	+1.03%

FDESX vs. FDFIX - Expense Ratio Comparison

FDESX has a 0.45% expense ratio, which is higher than FDFIX's 0.00% expense ratio.

Dividends

FDESX vs. FDFIX - Dividend Comparison

FDESX's dividend yield for the trailing twelve months is around 5.74%, more than FDFIX's 1.04% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FDESX Fidelity Advisor Diversified Stock Fund Class O	5.74%	6.58%	13.97%	3.55%	9.06%	16.87%	5.28%	3.23%	13.54%	7.61%	1.67%	8.53%
FDFIX Fidelity Flex 500 Index Fund	1.04%	1.11%	1.26%	1.48%	1.70%	1.27%	1.52%	1.78%	2.16%	0.50%	0.00%	0.00%

Frequently Asked Questions

Can I hold both FDESX and FDFIX in my portfolio?

With a correlation of 0.95, FDESX and FDFIX 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, FDESX or FDFIX?

FDESX has higher volatility (6.26%) compared to FDFIX (4.90%). In terms of maximum drawdown, FDESX dropped -65.36% vs FDFIX's -33.77%.

Which has better risk-adjusted returns?

FDFIX currently has the higher Sharpe Ratio (2.12 vs 2.05), 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.