FDFIX vs. FLCPX

Last updated Jun 4, 2026

FDFIX (Fidelity Flex 500 Index Fund) and FLCPX (Fidelity SAI U.S. Large Cap Index Fund) are both Large Cap Blend Equities funds from Fidelity. Over the past 5 years, FDFIX returned 14.20%/yr vs 14.29%/yr for FLCPX. With a 0.99 correlation, they move nearly in lockstep. FDFIX charges 0.00%/yr vs 0.02%/yr for FLCPX.

Performance

FDFIX vs. FLCPX - Performance Comparison

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

Returns By Period

The year-to-date returns for both investments are quite close, with FDFIX having a 11.53% return and FLCPX slightly higher at 11.72%.

FDFIX

• 1D: 0.22%
• 1M: 6.02%
• YTD: 11.53%
• 6M: 11.45%
• 1Y: 28.49%
• 3Y*: 22.62%
• 5Y*: 14.20%
• 10Y*: —

FLCPX

• 1D: 0.13%
• 1M: 5.81%
• YTD: 11.72%
• 6M: 11.75%
• 1Y: 28.98%
• 3Y*: 22.78%
• 5Y*: 14.29%
• 10Y*: 15.67%

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

FDFIX vs. FLCPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FDFIX Fidelity Flex 500 Index Fund	11.53%	17.59%	25.06%	26.27%	-18.10%	28.69%	18.46%	31.47%	-4.45%	14.41%
FLCPX Fidelity SAI U.S. Large Cap Index Fund	11.72%	17.84%	25.08%	26.25%	-18.06%	28.61%	18.24%	31.59%	-4.38%	14.81%

Correlation

The correlation between FDFIX and FLCPX 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	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.99
Correlation (All Time) Calculated using the full available price history since Mar 10, 2017	0.99

The correlation between FDFIX and FLCPX has been stable across timeframes, ranging from 0.98 to 1.00 - a consistent structural relationship.

Return for Risk

FDFIX vs. FLCPX — Risk / Return Rank

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

FDFIX

FDFIX Risk / Return Rank: 70
FDFIX Sharpe Ratio Rank: 72
FDFIX Sortino Ratio Rank: 64
FDFIX Omega Ratio Rank: 64
FDFIX Calmar Ratio Rank: 72
FDFIX Martin Ratio Rank: 80

FLCPX

FLCPX Risk / Return Rank: 74
FLCPX Sharpe Ratio Rank: 76
FLCPX Sortino Ratio Rank: 68
FLCPX Omega Ratio Rank: 67
FLCPX Calmar Ratio Rank: 74
FLCPX 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.

FDFIX vs. FLCPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Flex 500 Index Fund (FDFIX) and Fidelity SAI U.S. Large Cap Index Fund (FLCPX). 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	FLCPX	Difference
Sharpe ratio: Return per unit of total volatility	2.47	2.53	-0.06
Sortino ratio: Return per unit of downside risk	3.34	3.44	-0.09
Omega ratio: Gain probability vs. loss probability	1.45	1.46	-0.01
Calmar ratio: Return relative to maximum drawdown	3.28	3.38	-0.09
Martin ratio: Return relative to average drawdown	14.96	15.75	-0.79
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. FLCPX - Sharpe Ratio Comparison

The current FDFIX Sharpe Ratio is 2.47, which is comparable to the FLCPX Sharpe Ratio of 2.53. The chart below compares the historical Sharpe Ratios of FDFIX and FLCPX, 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	FLCPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.47	2.53	-0.06
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.84	0.84	0.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.87	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.82	0.92	-0.10

Drawdowns

FDFIX vs. FLCPX - Drawdown Comparison

The maximum FDFIX drawdown since its inception was -33.77%, roughly equal to the maximum FLCPX drawdown of -33.87%. Use the drawdown chart below to compare losses from any high point for FDFIX and FLCPX.

Drawdown Indicators

	FDFIX	FLCPX	Difference
Max Drawdown Largest peak-to-trough decline	-33.77%	-33.87%	+0.10%
Max Drawdown (1Y) Largest decline over 1 year	-8.99%	-8.89%	-0.10%
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	-18.76%	0.00%
Max Drawdown (5Y) Largest decline over 5 years	-24.51%	-24.40%	-0.11%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.87%	—
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-4.58%	-4.19%	-0.39%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.97%	1.90%	+0.07%

Volatility

FDFIX vs. FLCPX - Volatility Comparison

Fidelity Flex 500 Index Fund (FDFIX) and Fidelity SAI U.S. Large Cap Index Fund (FLCPX) have volatilities of 2.92% and 2.82%, 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

	FDFIX	FLCPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.92%	2.82%	+0.10%
Volatility (6M) Calculated over the trailing 6-month period	9.03%	8.98%	+0.05%
Volatility (1Y) Calculated over the trailing 1-year period	11.96%	11.86%	+0.10%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.95%	17.06%	-0.11%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.59%	18.16%	+0.43%

FDFIX vs. FLCPX - Expense Ratio Comparison

FDFIX has a 0.00% expense ratio, which is lower than FLCPX's 0.02% 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

FDFIX vs. FLCPX - Dividend Comparison

FDFIX's dividend yield for the trailing twelve months is around 1.03%, more than FLCPX's 0.50% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
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%	0.00%
FLCPX Fidelity SAI U.S. Large Cap Index Fund	0.50%	0.56%	6.11%	7.05%	11.23%	10.38%	3.93%	1.74%	2.18%	1.57%	0.76%

Frequently Asked Questions

Can I hold both FDFIX and FLCPX in my portfolio?

With a correlation of 1.00, FDFIX and FLCPX 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, FDFIX or FLCPX?

FDFIX has higher volatility (2.92%) compared to FLCPX (2.82%). In terms of maximum drawdown, FDFIX dropped -33.77% vs FLCPX's -33.87%.

Which has better risk-adjusted returns?

FLCPX currently has the higher Sharpe Ratio (2.53 vs 2.47), 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.