PIODX vs. VOO

Last updated Aug 1, 2026

PIODX (Pioneer Fund) and VOO (Vanguard S&P 500 ETF) are both funds - PIODX is a Large Cap Blend Equities fund managed by Amundi, while VOO is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, PIODX returned 15.71%/yr vs 15.14%/yr for VOO. Their 0.97 correlation means they have historically moved very closely together. PIODX charges 1.06%/yr vs 0.03%/yr for VOO.

Performance

PIODX vs. VOO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Pioneer Fund (PIODX) 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, PIODX achieves a 7.19% return, which is significantly lower than VOO's 10.16% return. Both investments have delivered pretty close results over the past 10 years, with PIODX having a 15.71% annualized return and VOO not far behind at 15.14%.

PIODX

• 1D: 2.73%
• 1M: -2.16%
• 6M: 3.50%
• YTD: 7.19%
• 1Y: 18.02%
• 3Y*: 20.27%
• 5Y*: 12.40%
• 10Y*: 15.71%
• ALL TIME*: 8.74%

VOO

• 1D: 0.71%
• 1M: 0.26%
• 6M: 8.58%
• YTD: 10.16%
• 1Y: 21.58%
• 3Y*: 19.42%
• 5Y*: 12.83%
• 10Y*: 15.14%
• ALL TIME*: 14.78%

*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)
PIODX Pioneer Fund	$0.00	$0.00	$0.00
VOO Vanguard S&P 500 ETF	$3.82B	$3.78B	$5.44B

PIODX vs. VOO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PIODX Pioneer Fund	7.19%	23.30%	22.62%	28.45%	-19.43%	27.40%	24.01%	31.04%	-1.48%	21.79%
VOO Vanguard S&P 500 ETF	10.16%	17.82%	24.98%	26.32%	-18.17%	28.79%	18.32%	31.37%	-4.50%	21.77%

Correlation

The correlation between PIODX and VOO is 0.93, 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.	0.93
Correlation (3Y) Balances recent behavior with more history.	0.94
Correlation (5Y) Shows whether the relationship held over a longer period.	0.96
Correlation (10Y) Provides a long-term view across more market conditions.	0.96
Correlation (All Time) Calculated using the full available price history since Sep 9, 2010	0.97

The correlation between PIODX and VOO has been stable across timeframes, ranging from 0.93 to 0.97 - a consistent structural relationship.

Return for Risk

PIODX vs. VOO — Risk / Return Rank

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

PIODX

PIODX Risk / Return Rank: 33
PIODX Sharpe Ratio Rank: 29
PIODX Sortino Ratio Rank: 28
PIODX Omega Ratio Rank: 28
PIODX Calmar Ratio Rank: 39
PIODX Martin Ratio Rank: 40

VOO

VOO Risk / Return Rank: 68
VOO Sharpe Ratio Rank: 68
VOO Sortino Ratio Rank: 65
VOO Omega Ratio Rank: 66
VOO Calmar Ratio Rank: 64
VOO Martin Ratio Rank: 76

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.

PIODX vs. VOO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Pioneer Fund (PIODX) 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.

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.

	PIODX	VOO	Difference
Sharpe ratio: Return per unit of total volatility	0.95	1.53	-0.59
Sortino ratio: Return per unit of downside risk	1.37	2.13	-0.76
Omega ratio: Gain probability vs. loss probability	1.17	1.28	-0.11
Calmar ratio: Return relative to maximum drawdown	1.56	2.21	-0.65
Martin ratio: Return relative to average drawdown	5.74	9.44	-3.70

PIODX vs. VOO - Sharpe Ratio Comparison

The current PIODX Sharpe Ratio is 0.95, which is lower than the VOO Sharpe Ratio of 1.53. The chart below compares the historical Sharpe Ratios of PIODX 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.

Drawdowns

PIODX vs. VOO - Drawdown Comparison

The maximum PIODX drawdown since its inception was -53.40%, which is greater than VOO's maximum drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for PIODX and VOO.

Drawdown Indicators

	PIODX	VOO	Difference
Max Drawdown Largest peak-to-trough decline	-53.40%	-33.99%	-19.41%
Max Drawdown (1Y) Largest decline over 1 year	-9.99%	-8.90%	-1.09%
Max Drawdown (3Y) Largest decline over 3 years	-21.52%	-18.69%	-2.83%
Max Drawdown (5Y) Largest decline over 5 years	-26.55%	-24.52%	-2.03%
Max Drawdown (10Y) Largest decline over 10 years	-30.14%	-33.99%	+3.85%
Current Drawdown Current decline from peak	-5.42%	-1.38%	-4.04%
Average Drawdown Average peak-to-trough decline	-8.58%	-3.67%	-4.91%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.72%	2.08%	+0.64%

Volatility

PIODX vs. VOO - Volatility Comparison

Pioneer Fund (PIODX) has a higher volatility of 5.08% compared to Vanguard S&P 500 ETF (VOO) at 3.54%. This indicates that PIODX'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

	PIODX	VOO	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.08%	3.54%	+1.54%
Volatility (6M) Calculated over the trailing 6-month period	12.86%	10.10%	+2.76%
Volatility (1Y) Calculated over the trailing 1-year period	16.52%	12.82%	+3.70%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.39%	16.93%	+2.46%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.96%	18.01%	+0.95%

PIODX vs. VOO - Expense Ratio Comparison

PIODX has a 1.06% expense ratio, which is higher than VOO's 0.03% expense ratio.

Dividends

PIODX vs. VOO - Dividend Comparison

PIODX's dividend yield for the trailing twelve months is around 9.29%, more than VOO's 1.07% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PIODX Pioneer Fund	9.29%	10.04%	14.17%	2.86%	4.13%	16.18%	5.82%	9.37%	15.37%	21.35%	20.51%	14.53%
VOO Vanguard S&P 500 ETF	1.07%	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 PIODX and VOO in my portfolio?

With a correlation of 0.93, PIODX and VOO 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, PIODX or VOO?

PIODX has higher volatility (5.08%) compared to VOO (3.54%). In terms of maximum drawdown, PIODX dropped -53.40% vs VOO's -33.99%.

Which has better risk-adjusted returns?

VOO currently has the higher Sharpe Ratio (1.53 vs 0.95), 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.