FLAPX vs. VOO

Last updated Jun 4, 2026

FLAPX (Fidelity Flex Mid Cap Index Fund) and VOO (Vanguard S&P 500 ETF) are both funds - FLAPX is a Mid Cap Blend Equities fund managed by Fidelity, while VOO is a S&P 500 fund tracking the S&P 500 Index. Over the past 5 years, FLAPX returned 9.56%/yr vs 13.90%/yr for VOO. Their correlation of 0.90 suggests significant overlap in exposure. FLAPX charges 0.00%/yr vs 0.03%/yr for VOO.

Performance

FLAPX vs. VOO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Flex Mid Cap Index Fund (FLAPX) and Vanguard S&P 500 ETF (VOO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FLAPX achieves a 15.19% return, which is significantly higher than VOO's 10.91% return.

FLAPX

• 1D: 0.37%
• 1M: 3.60%
• YTD: 15.19%
• 6M: 15.35%
• 1Y: 28.95%
• 3Y*: 19.67%
• 5Y*: 9.56%
• 10Y*: —

VOO

• 1D: -0.70%
• 1M: 5.04%
• YTD: 10.91%
• 6M: 10.93%
• 1Y: 28.04%
• 3Y*: 22.44%
• 5Y*: 13.90%
• 10Y*: 15.56%

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

FLAPX vs. VOO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FLAPX Fidelity Flex Mid Cap Index Fund	15.19%	14.33%	15.30%	17.28%	-17.28%	22.59%	17.30%	30.56%	-9.10%	14.01%
VOO Vanguard S&P 500 ETF	10.91%	17.82%	24.98%	26.32%	-18.17%	28.79%	18.32%	31.37%	-4.50%	15.00%

Correlation

The correlation between FLAPX and VOO is 0.78, 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	0.78
Correlation (3Y) Calculated over the trailing 3-year period	0.82
Correlation (5Y) Calculated over the trailing 5-year period	0.88
Correlation (All Time) Calculated using the full available price history since Mar 10, 2017	0.90

The correlation between FLAPX and VOO shifts across timeframes, from 0.78 (1 year) to 0.90 (all time), reflecting how their relationship changes across market environments.

Return for Risk

FLAPX vs. VOO — Risk / Return Rank

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

FLAPX

FLAPX Risk / Return Rank: 54
FLAPX Sharpe Ratio Rank: 45
FLAPX Sortino Ratio Rank: 45
FLAPX Omega Ratio Rank: 42
FLAPX Calmar Ratio Rank: 72
FLAPX Martin Ratio Rank: 67

VOO

VOO Risk / Return Rank: 70
VOO Sharpe Ratio Rank: 71
VOO Sortino Ratio Rank: 70
VOO Omega Ratio Rank: 70
VOO Calmar Ratio Rank: 62
VOO Martin Ratio Rank: 75

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.

FLAPX vs. VOO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Flex Mid Cap Index Fund (FLAPX) and Vanguard S&P 500 ETF (VOO). 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.

	FLAPX	VOO	Difference
Sharpe ratio: Return per unit of total volatility	1.96	2.39	-0.43
Sortino ratio: Return per unit of downside risk	2.81	3.25	-0.45
Omega ratio: Gain probability vs. loss probability	1.34	1.43	-0.09
Calmar ratio: Return relative to maximum drawdown	3.31	3.16	+0.14
Martin ratio: Return relative to average drawdown	13.10	14.73	-1.63
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FLAPX vs. VOO - Sharpe Ratio Comparison

The current FLAPX Sharpe Ratio is 1.96, which is comparable to the VOO Sharpe Ratio of 2.39. The chart below compares the historical Sharpe Ratios of FLAPX and VOO, 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

	FLAPX	VOO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.96	2.39	-0.43
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.52	0.83	-0.31
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.87	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.61	0.89	-0.28

Drawdowns

FLAPX vs. VOO - Drawdown Comparison

The maximum FLAPX drawdown since its inception was -40.31%, which is greater than VOO's maximum drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for FLAPX and VOO.

Drawdown Indicators

	FLAPX	VOO	Difference
Max Drawdown Largest peak-to-trough decline	-40.31%	-33.99%	-6.32%
Max Drawdown (1Y) Largest decline over 1 year	-9.21%	-8.90%	-0.31%
Max Drawdown (3Y) Largest decline over 3 years	-21.02%	-18.69%	-2.33%
Max Drawdown (5Y) Largest decline over 5 years	-26.09%	-24.52%	-1.57%
Max Drawdown (10Y) Largest decline over 10 years	—	-33.99%	—
Current Drawdown Current decline from peak	0.00%	-0.70%	+0.70%
Average Drawdown Average peak-to-trough decline	-6.12%	-3.69%	-2.43%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.32%	1.91%	+0.41%

Volatility

FLAPX vs. VOO - Volatility Comparison

Fidelity Flex Mid Cap Index Fund (FLAPX) has a higher volatility of 3.80% compared to Vanguard S&P 500 ETF (VOO) at 2.84%. This indicates that FLAPX's price experiences larger fluctuations and is considered to be riskier than VOO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FLAPX	VOO	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.80%	2.84%	+0.96%
Volatility (6M) Calculated over the trailing 6-month period	11.55%	8.90%	+2.65%
Volatility (1Y) Calculated over the trailing 1-year period	15.51%	11.80%	+3.71%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.58%	16.81%	+1.77%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.95%	18.01%	+1.94%

FLAPX vs. VOO - Expense Ratio Comparison

FLAPX has a 0.00% expense ratio, which is lower than VOO's 0.03% 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

FLAPX vs. VOO - Dividend Comparison

FLAPX has not paid dividends to shareholders, while VOO's dividend yield for the trailing twelve months is around 1.03%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FLAPX Fidelity Flex Mid Cap Index Fund	0.00%	0.00%	1.08%	1.99%	1.82%	2.83%	2.16%	2.18%	2.24%	0.44%	0.00%	0.00%
VOO Vanguard S&P 500 ETF	1.03%	1.13%	1.24%	1.46%	1.69%	1.25%	1.54%	1.88%	2.06%	1.78%	2.02%	2.10%

Frequently Asked Questions

Can I hold both FLAPX and VOO in my portfolio?

FLAPX and VOO have a correlation of 0.78, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FLAPX or VOO?

FLAPX has higher volatility (3.80%) compared to VOO (2.84%). In terms of maximum drawdown, FLAPX dropped -40.31% vs VOO's -33.99%.

Which has better risk-adjusted returns?

VOO currently has the higher Sharpe Ratio (2.39 vs 1.96), 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.