ODIIX vs. FDFIX

Last updated Jun 3, 2026

ODIIX (Invesco Discovery Fund Class R6) and FDFIX (Fidelity Flex 500 Index Fund) are both mutual funds - ODIIX is a Small Cap Growth Equities fund actively managed by Invesco, while FDFIX is a Large Cap Blend Equities fund managed by Fidelity. Over the past 5 years, ODIIX returned 10.51%/yr vs 14.07%/yr for FDFIX. Their correlation of 0.81 suggests significant overlap in exposure. ODIIX charges 0.65%/yr vs 0.00%/yr for FDFIX.

Performance

ODIIX vs. FDFIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco Discovery Fund Class R6 (ODIIX) 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, ODIIX achieves a 28.09% return, which is significantly higher than FDFIX's 11.29% return.

ODIIX

• 1D: -1.00%
• 1M: 3.52%
• YTD: 28.09%
• 6M: 29.99%
• 1Y: 54.43%
• 3Y*: 26.31%
• 5Y*: 10.51%
• 10Y*: 16.71%

FDFIX

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

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

ODIIX vs. FDFIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ODIIX Invesco Discovery Fund Class R6	28.09%	17.14%	23.04%	17.46%	-31.00%	15.37%	50.87%	37.36%	-3.68%	21.61%
FDFIX Fidelity Flex 500 Index Fund	11.29%	17.59%	25.06%	26.27%	-18.10%	28.69%	18.46%	31.47%	-4.45%	14.41%

Correlation

The correlation between ODIIX and FDFIX is 0.69, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.69
Correlation (3Y) Calculated over the trailing 3-year period	0.77
Correlation (5Y) Calculated over the trailing 5-year period	0.82
Correlation (All Time) Calculated using the full available price history since Mar 10, 2017	0.81

The correlation between ODIIX and FDFIX shifts across timeframes, from 0.69 (1 year) to 0.82 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

ODIIX vs. FDFIX — Risk / Return Rank

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

ODIIX

ODIIX Risk / Return Rank: 78
ODIIX Sharpe Ratio Rank: 76
ODIIX Sortino Ratio Rank: 64
ODIIX Omega Ratio Rank: 58
ODIIX Calmar Ratio Rank: 96
ODIIX Martin Ratio Rank: 96

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

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.

ODIIX vs. FDFIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Discovery Fund Class R6 (ODIIX) 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.

	ODIIX	FDFIX	Difference
Sharpe ratio Return per unit of total volatility	2.53	2.49	+0.04
Sortino ratio Return per unit of downside risk	3.35	3.37	-0.02
Omega ratio Gain probability vs. loss probability	1.42	1.45	-0.03
Calmar ratio Return relative to maximum drawdown	6.10	3.34	+2.76
Martin ratio Return relative to average drawdown	25.31	15.29	+10.02
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ODIIX vs. FDFIX - Sharpe Ratio Comparison

The current ODIIX Sharpe Ratio is 2.53, which is comparable to the FDFIX Sharpe Ratio of 2.49. The chart below compares the historical Sharpe Ratios of ODIIX 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.

Sharpe Ratios by Period

	ODIIX	FDFIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.53	2.49	+0.04
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.42	0.84	-0.41
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.68	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.66	0.82	-0.16

Drawdowns

ODIIX vs. FDFIX - Drawdown Comparison

The maximum ODIIX drawdown since its inception was -43.06%, which is greater than FDFIX's maximum drawdown of -33.77%. Use the drawdown chart below to compare losses from any high point for ODIIX and FDFIX.

Drawdown Indicators

	ODIIX	FDFIX	Difference
Max Drawdown Largest peak-to-trough decline	-43.06%	-33.77%	-9.29%
Max Drawdown (1Y) Largest decline over 1 year	-11.36%	-8.99%	-2.37%
Max Drawdown (3Y) Largest decline over 3 years	-28.52%	-18.76%	-9.76%
Max Drawdown (5Y) Largest decline over 5 years	-43.06%	-24.51%	-18.55%
Max Drawdown (10Y) Largest decline over 10 years	-43.06%	—	—
Current Drawdown Current decline from peak	-2.52%	0.00%	-2.52%
Average Drawdown Average peak-to-trough decline	-10.17%	-4.58%	-5.59%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.74%	1.97%	+0.77%

Volatility

ODIIX vs. FDFIX - Volatility Comparison

Invesco Discovery Fund Class R6 (ODIIX) has a higher volatility of 7.53% compared to Fidelity Flex 500 Index Fund (FDFIX) at 2.92%. This indicates that ODIIX'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

	ODIIX	FDFIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.53%	2.92%	+4.61%
Volatility (6M) Calculated over the trailing 6-month period	21.38%	9.05%	+12.33%
Volatility (1Y) Calculated over the trailing 1-year period	25.18%	11.98%	+13.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	25.52%	16.95%	+8.57%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	24.91%	18.59%	+6.32%

ODIIX vs. FDFIX - Expense Ratio Comparison

ODIIX has a 0.65% expense ratio, which is higher than FDFIX's 0.00% expense ratio.

Dividends

ODIIX vs. FDFIX - Dividend Comparison

ODIIX's dividend yield for the trailing twelve months is around 7.76%, more than FDFIX's 1.03% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%	0.00%
ODIIX Invesco Discovery Fund Class R6	7.76%	9.94%	5.27%	0.00%	0.00%	16.15%	9.22%	5.40%	16.05%	10.90%	3.86%	6.15%

Frequently Asked Questions

Can I hold both ODIIX and FDFIX in my portfolio?

ODIIX and FDFIX have a correlation of 0.69, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ODIIX or FDFIX?

ODIIX has higher volatility (7.53%) compared to FDFIX (2.92%). In terms of maximum drawdown, ODIIX dropped -43.06% vs FDFIX's -33.77%.

Which has better risk-adjusted returns?

ODIIX currently has the higher Sharpe Ratio (2.53 vs 2.49), 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.