FDFIX vs. AMFEX

Last updated Aug 1, 2026

FDFIX (Fidelity Flex 500 Index Fund) and AMFEX (AAMA Equity Fund) are both Large Cap Blend Equities funds. Over the past 5 years, FDFIX returned 12.59%/yr vs 10.69%/yr for AMFEX. Their 0.96 correlation means they have historically moved very closely together. FDFIX charges 0.00%/yr vs 1.17%/yr for AMFEX.

Performance

FDFIX vs. AMFEX - Performance Comparison

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

Returns By Period

In the year-to-date period, FDFIX achieves a 9.08% return, which is significantly lower than AMFEX's 13.57% return.

FDFIX

• 1D: 1.70%
• 1M: -0.67%
• 6M: 7.78%
• YTD: 9.08%
• 1Y: 20.10%
• 3Y*: 18.85%
• 5Y*: 12.59%
• 10Y*: —
• ALL TIME*: 14.73%

AMFEX

• 1D: 0.80%
• 1M: 0.71%
• 6M: 8.82%
• YTD: 13.57%
• 1Y: 24.69%
• 3Y*: 16.86%
• 5Y*: 10.69%
• 10Y*: —
• ALL TIME*: 12.18%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
AMFEX AAMA Equity Fund	$0.00	$0.00	$0.00
FDFIX Fidelity Flex 500 Index Fund	$0.00	$0.00	$0.00

FDFIX vs. AMFEX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
FDFIX Fidelity Flex 500 Index Fund	9.08%	17.59%	25.06%	26.27%	-18.10%	28.69%	18.46%	31.47%	-8.70%
AMFEX AAMA Equity Fund	13.57%	17.33%	16.28%	17.32%	-14.08%	22.58%	12.70%	24.62%	-9.60%

Correlation

The correlation between FDFIX and AMFEX is 0.86, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.86
Correlation (3Y) Balances recent behavior with more history.	0.91
Correlation (5Y) Shows whether the relationship held over a longer period.	0.95
Correlation (All Time) Calculated using the full available price history since Nov 7, 2018	0.96

The correlation between FDFIX and AMFEX shifts across timeframes, from 0.86 (1 year) to 0.96 (all time), reflecting how their relationship changes across market environments.

Return for Risk

FDFIX vs. AMFEX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

FDFIX

FDFIX Risk / Return Rank: 59
FDFIX Sharpe Ratio Rank: 56
FDFIX Sortino Ratio Rank: 53
FDFIX Omega Ratio Rank: 54
FDFIX Calmar Ratio Rank: 61
FDFIX Martin Ratio Rank: 70

AMFEX

AMFEX Risk / Return Rank: 89
AMFEX Sharpe Ratio Rank: 89
AMFEX Sortino Ratio Rank: 85
AMFEX Omega Ratio Rank: 83
AMFEX Calmar Ratio Rank: 92
AMFEX Martin Ratio Rank: 95

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

FDFIX vs. AMFEX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Flex 500 Index Fund (FDFIX) and AAMA Equity Fund (AMFEX). 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.

	FDFIX	AMFEX	Difference
Sharpe ratio: Return per unit of total volatility	1.38	2.22	-0.85
Sortino ratio: Return per unit of downside risk	1.93	3.03	-1.10
Omega ratio: Gain probability vs. loss probability	1.25	1.39	-0.15
Calmar ratio: Return relative to maximum drawdown	1.99	3.69	-1.70
Martin ratio: Return relative to average drawdown	8.36	15.37	-7.01

FDFIX vs. AMFEX - Sharpe Ratio Comparison

The current FDFIX Sharpe Ratio is 1.38, which is lower than the AMFEX Sharpe Ratio of 2.22. The chart below compares the historical Sharpe Ratios of FDFIX and AMFEX, 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

FDFIX vs. AMFEX - Drawdown Comparison

The maximum FDFIX drawdown since its inception was -33.77%, which is greater than AMFEX's maximum drawdown of -30.41%. Use the drawdown chart below to compare losses from any high point for FDFIX and AMFEX.

Drawdown Indicators

	FDFIX	AMFEX	Difference
Max Drawdown Largest peak-to-trough decline	-33.77%	-30.41%	-3.36%
Max Drawdown (1Y) Largest decline over 1 year	-8.99%	-6.07%	-2.92%
Max Drawdown (3Y) Largest decline over 3 years	-18.76%	-15.23%	-3.53%
Max Drawdown (5Y) Largest decline over 5 years	-24.51%	-21.21%	-3.30%
Current Drawdown Current decline from peak	-2.20%	-0.42%	-1.78%
Average Drawdown Average peak-to-trough decline	-4.53%	-4.24%	-0.29%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.14%	1.46%	+0.68%

Volatility

FDFIX vs. AMFEX - Volatility Comparison

Fidelity Flex 500 Index Fund (FDFIX) has a higher volatility of 3.50% compared to AAMA Equity Fund (AMFEX) at 2.37%. This indicates that FDFIX's price experiences larger fluctuations and is considered to be riskier than AMFEX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FDFIX	AMFEX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.50%	2.37%	+1.13%
Volatility (6M) Calculated over the trailing 6-month period	10.20%	7.74%	+2.46%
Volatility (1Y) Calculated over the trailing 1-year period	13.02%	10.10%	+2.92%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.07%	14.22%	+2.85%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.53%	16.84%	+1.69%

FDFIX vs. AMFEX - Expense Ratio Comparison

FDFIX has a 0.00% expense ratio, which is lower than AMFEX's 1.17% expense ratio.

Dividends

FDFIX vs. AMFEX - Dividend Comparison

FDFIX's dividend yield for the trailing twelve months is around 1.07%, less than AMFEX's 10.56% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017
AMFEX AAMA Equity Fund	10.56%	11.99%	9.19%	0.92%	4.82%	0.22%	0.44%	0.78%	0.83%	0.00%
FDFIX Fidelity Flex 500 Index Fund	1.07%	1.11%	1.26%	1.48%	1.70%	1.27%	1.52%	1.78%	2.16%	0.50%

Frequently Asked Questions

Can I hold both FDFIX and AMFEX in my portfolio?

FDFIX and AMFEX have a correlation of 0.86, 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 AMFEX?

FDFIX has higher volatility (3.50%) compared to AMFEX (2.37%). In terms of maximum drawdown, FDFIX dropped -33.77% vs AMFEX's -30.41%.

Which has better risk-adjusted returns?

AMFEX currently has the higher Sharpe Ratio (2.22 vs 1.38), 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.