PKW vs. VOO

Last updated Jun 3, 2026

PKW (Invesco BuyBack Achievers™ ETF) and VOO (Vanguard S&P 500 ETF) are both exchange-traded funds - PKW is a Mid Cap Value Equities fund tracking the NASDAQ US BuyBack Achievers Index, while VOO is a S&P 500 fund tracking the S&P 500 Index. Both are passively managed. Over the past 10 years, PKW returned 12.85%/yr vs 15.65%/yr for VOO. Their correlation of 0.87 suggests significant overlap in exposure. PKW charges 0.62%/yr vs 0.03%/yr for VOO.

Performance

PKW vs. VOO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco BuyBack Achievers™ ETF (PKW) 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, PKW achieves a 2.82% return, which is significantly lower than VOO's 11.69% return. Over the past 10 years, PKW has underperformed VOO with an annualized return of 12.85%, while VOO has yielded a comparatively higher 15.65% annualized return.

PKW

• 1D: 0.22%
• 1M: -0.24%
• YTD: 2.82%
• 6M: 4.68%
• 1Y: 17.61%
• 3Y*: 18.75%
• 5Y*: 10.22%
• 10Y*: 12.85%

VOO

• 1D: 0.14%
• 1M: 5.39%
• YTD: 11.69%
• 6M: 12.11%
• 1Y: 29.68%
• 3Y*: 22.73%
• 5Y*: 14.26%
• 10Y*: 15.65%

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

PKW vs. VOO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PKW Invesco BuyBack Achievers™ ETF	2.82%	17.92%	17.33%	17.24%	-10.21%	32.62%	8.41%	34.09%	-10.53%	17.75%
VOO Vanguard S&P 500 ETF	11.69%	17.82%	24.98%	26.32%	-18.17%	28.79%	18.32%	31.37%	-4.50%	21.77%

Correlation

The correlation between PKW and VOO 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	0.73
Correlation (5Y) Calculated over the trailing 5-year period	0.81
Correlation (10Y) Calculated over the trailing 10-year period	0.83
Correlation (All Time) Calculated using the full available price history since Sep 10, 2010	0.87

The correlation between PKW and VOO shifts across timeframes, from 0.69 (1 year) to 0.87 (all time), reflecting how their relationship changes across market environments.

PKW vs. VOO - Sectors Allocation Comparison

Sectors	PKW	VOO
Financial Services	29.4%	11.6%
Consumer Cyclical	19.1%	10.2%
Industrials	14.2%	8.3%
Technology	10.8%	35.7%
Healthcare	10.1%	8.5%
Energy	5.6%	3.5%
Communication Services	4.0%	11.3%
Consumer Defensive	3.4%	4.9%
Utilities	2.1%	2.4%
Basic Materials	1.1%	1.8%
Real Estate	0.3%	1.9%

Return for Risk

PKW vs. VOO — Risk / Return Rank

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

PKW

PKW Risk / Return Rank: 40
PKW Sharpe Ratio Rank: 37
PKW Sortino Ratio Rank: 39
PKW Omega Ratio Rank: 36
PKW Calmar Ratio Rank: 45
PKW Martin Ratio Rank: 45

VOO

VOO Risk / Return Rank: 75
VOO Sharpe Ratio Rank: 77
VOO Sortino Ratio Rank: 75
VOO Omega Ratio Rank: 76
VOO Calmar Ratio Rank: 68
VOO Martin Ratio Rank: 80

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.

PKW vs. VOO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco BuyBack Achievers™ ETF (PKW) 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.

	PKW	VOO	Difference
Sharpe ratio Return per unit of total volatility	1.35	2.53	-1.18
Sortino ratio Return per unit of downside risk	2.00	3.43	-1.43
Omega ratio Gain probability vs. loss probability	1.24	1.46	-0.23
Calmar ratio Return relative to maximum drawdown	2.29	3.42	-1.13
Martin ratio Return relative to average drawdown	7.24	15.95	-8.70
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PKW vs. VOO - Sharpe Ratio Comparison

The current PKW Sharpe Ratio is 1.35, which is lower than the VOO Sharpe Ratio of 2.53. The chart below compares the historical Sharpe Ratios of PKW 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

	PKW	VOO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.35	2.53	-1.18
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.59	0.85	-0.26
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.65	0.87	-0.22
Sharpe Ratio (All Time) Calculated using the full available price history	0.52	0.89	-0.37

Drawdowns

PKW vs. VOO - Drawdown Comparison

The maximum PKW drawdown since its inception was -54.59%, which is greater than VOO's maximum drawdown of -33.99%. Use the drawdown chart below to compare losses from any high point for PKW and VOO.

Drawdown Indicators

	PKW	VOO	Difference
Max Drawdown Largest peak-to-trough decline	-54.59%	-33.99%	-20.60%
Max Drawdown (1Y) Largest decline over 1 year	-7.86%	-8.90%	+1.04%
Max Drawdown (3Y) Largest decline over 3 years	-20.91%	-18.69%	-2.22%
Max Drawdown (5Y) Largest decline over 5 years	-23.51%	-24.52%	+1.01%
Max Drawdown (10Y) Largest decline over 10 years	-40.93%	-33.99%	-6.94%
Current Drawdown Current decline from peak	-1.78%	0.00%	-1.78%
Average Drawdown Average peak-to-trough decline	-7.96%	-3.69%	-4.27%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.48%	1.91%	+0.57%

Volatility

PKW vs. VOO - Volatility Comparison

Invesco BuyBack Achievers™ ETF (PKW) has a higher volatility of 3.21% compared to Vanguard S&P 500 ETF (VOO) at 2.74%. This indicates that PKW'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

	PKW	VOO	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.21%	2.74%	+0.47%
Volatility (6M) Calculated over the trailing 6-month period	9.38%	8.88%	+0.50%
Volatility (1Y) Calculated over the trailing 1-year period	13.13%	11.78%	+1.35%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.45%	16.81%	+0.64%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.79%	18.01%	+1.78%

PKW vs. VOO - Expense Ratio Comparison

PKW has a 0.62% expense ratio, which is higher than VOO's 0.03% expense ratio.

Dividends

PKW vs. VOO - Dividend Comparison

PKW's dividend yield for the trailing twelve months is around 0.90%, less than VOO's 1.02% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PKW Invesco BuyBack Achievers™ ETF	0.90%	0.99%	0.86%	1.17%	1.22%	0.72%	1.48%	1.30%	1.30%	0.65%	1.59%	1.14%
VOO Vanguard S&P 500 ETF	1.02%	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 PKW and VOO in my portfolio?

PKW and VOO 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, PKW or VOO?

PKW has higher volatility (3.21%) compared to VOO (2.74%). In terms of maximum drawdown, PKW dropped -54.59% vs VOO's -33.99%.

Which ETF is better, PKW or VOO?

On 10-year performance, VOO leads with 15.65% vs 12.85% for PKW. On fees, VOO is cheaper at 0.03% per year. On volatility, VOO has been the lower-risk option at 2.74%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, PKW or VOO?

Over the 10-year period, VOO has performed better with a 15.65% return vs 12.85%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, PKW or VOO?

VOO is cheaper with a 0.03% expense ratio, compared with 0.62% for PKW.

Which ETF pays a higher dividend yield, PKW or VOO?

VOO has the higher dividend yield at 1.02%, compared with 0.90% for PKW.

What is the main difference between PKW and VOO?

PKW is categorized as Mid Cap Value Equities, while VOO is S&P 500. PKW tracks NASDAQ US BuyBack Achievers Index, while VOO tracks S&P 500 Index. They also come from different issuers: Invesco and Vanguard. Their fees differ too: 0.62% for PKW and 0.03% for VOO.

Which has better risk-adjusted returns?

VOO currently has the higher Sharpe Ratio (2.53 vs 1.35), 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.