PKW vs. PBW

Last updated Jun 23, 2026

PKW (Invesco BuyBack Achievers™ ETF) and PBW (Invesco WilderHill Clean Energy ETF) are both exchange-traded funds - PKW is a Mid Cap Value Equities fund tracking the NASDAQ US BuyBack Achievers Index, while PBW is a Small Cap Growth Equities fund tracking the The WilderHill Clean Energy Index (AMEX). Both are passively managed. Over the past 10 years, PKW returned 13.51%/yr vs 10.55%/yr for PBW. A 0.65 correlation means they provide meaningful diversification when combined. PKW charges 0.62%/yr vs 0.61%/yr for PBW.

Performance

PKW vs. PBW - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco BuyBack Achievers™ ETF (PKW) and Invesco WilderHill Clean Energy ETF (PBW). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PKW achieves a 3.57% return, which is significantly lower than PBW's 35.89% return. Over the past 10 years, PKW has outperformed PBW with an annualized return of 13.51%, while PBW has yielded a comparatively lower 10.55% annualized return.

PKW

• 1D: 0.58%
• 1M: 1.85%
• YTD: 3.57%
• 6M: 2.25%
• 1Y: 16.56%
• 3Y*: 18.34%
• 5Y*: 10.38%
• 10Y*: 13.51%

PBW

• 1D: -0.19%
• 1M: -3.61%
• YTD: 35.89%
• 6M: 27.66%
• 1Y: 118.27%
• 3Y*: 5.84%
• 5Y*: -12.35%
• 10Y*: 10.55%

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

PKW vs. PBW - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PKW Invesco BuyBack Achievers™ ETF	3.57%	17.92%	17.33%	17.24%	-10.21%	32.62%	8.41%	34.09%	-10.53%	17.75%
PBW Invesco WilderHill Clean Energy ETF	35.89%	53.96%	-30.77%	-20.03%	-44.55%	-29.86%	204.82%	62.58%	-14.11%	39.92%

Correlation

The correlation between PKW and PBW is 0.47, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.47
Correlation (3Y) Calculated over the trailing 3-year period	0.54
Correlation (5Y) Calculated over the trailing 5-year period	0.59
Correlation (10Y) Calculated over the trailing 10-year period	0.60
Correlation (All Time) Calculated using the full available price history since Dec 20, 2006	0.65

The correlation between PKW and PBW shifts across timeframes, from 0.47 (1 year) to 0.65 (all time), reflecting how their relationship changes across market environments.

PKW vs. PBW - Sectors Allocation Comparison

Sectors	PKW	PBW
Financial Services	28.4%	1.5%
Consumer Cyclical	19.0%	14.9%
Industrials	14.0%	34.2%
Technology	12.3%	14.4%
Healthcare	10.2%	-
Energy	5.4%	11.2%
Communication Services	4.1%	-
Consumer Defensive	3.2%	1.1%
Utilities	2.2%	6.5%
Basic Materials	1.0%	16.2%
Real Estate	0.3%	-

Return for Risk

PKW vs. PBW — Risk / Return Rank

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

PKW

PKW Risk / Return Rank: 38
PKW Sharpe Ratio Rank: 36
PKW Sortino Ratio Rank: 37
PKW Omega Ratio Rank: 33
PKW Calmar Ratio Rank: 44
PKW Martin Ratio Rank: 42

PBW

PBW Risk / Return Rank: 80
PBW Sharpe Ratio Rank: 89
PBW Sortino Ratio Rank: 72
PBW Omega Ratio Rank: 68
PBW Calmar Ratio Rank: 91
PBW Martin Ratio Rank: 78

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. PBW - Risk-Adjusted Trends Comparison

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

	PKW	PBW	Difference
Sharpe ratio: Return per unit of total volatility	1.25	2.83	-1.57
Sortino ratio: Return per unit of downside risk	1.86	3.12	-1.26
Omega ratio: Gain probability vs. loss probability	1.22	1.39	-0.17
Calmar ratio: Return relative to maximum drawdown	2.12	5.60	-3.48
Martin ratio: Return relative to average drawdown	6.64	14.48	-7.85

PKW vs. PBW - Sharpe Ratio Comparison

The current PKW Sharpe Ratio is 1.25, which is lower than the PBW Sharpe Ratio of 2.83. The chart below compares the historical Sharpe Ratios of PKW and PBW, 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

PKW vs. PBW - Drawdown Comparison

The maximum PKW drawdown since its inception was -54.59%, smaller than the maximum PBW drawdown of -89.02%. Use the drawdown chart below to compare losses from any high point for PKW and PBW.

Drawdown Indicators

	PKW	PBW	Difference
Max Drawdown Largest peak-to-trough decline	-54.59%	-89.02%	+34.43%
Max Drawdown (1Y) Largest decline over 1 year	-7.86%	-21.24%	+13.38%
Max Drawdown (3Y) Largest decline over 3 years	-20.91%	-68.04%	+47.13%
Max Drawdown (5Y) Largest decline over 5 years	-23.51%	-84.50%	+60.99%
Max Drawdown (10Y) Largest decline over 10 years	-40.93%	-89.02%	+48.09%
Current Drawdown Current decline from peak	-1.09%	-65.75%	+64.66%
Average Drawdown Average peak-to-trough decline	-7.94%	-62.90%	+54.96%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.50%	8.20%	-5.70%

Volatility

PKW vs. PBW - Volatility Comparison

The current volatility for Invesco BuyBack Achievers™ ETF (PKW) is 3.41%, while Invesco WilderHill Clean Energy ETF (PBW) has a volatility of 17.70%. This indicates that PKW experiences smaller price fluctuations and is considered to be less risky than PBW based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PKW	PBW	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.41%	17.70%	-14.29%
Volatility (6M) Calculated over the trailing 6-month period	9.69%	30.93%	-21.24%
Volatility (1Y) Calculated over the trailing 1-year period	13.32%	42.17%	-28.85%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.43%	43.34%	-25.91%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.80%	39.00%	-19.20%

PKW vs. PBW - Expense Ratio Comparison

PKW has a 0.62% expense ratio, which is higher than PBW's 0.61% expense ratio.

Dividends

PKW vs. PBW - Dividend Comparison

PKW's dividend yield for the trailing twelve months is around 1.08%, less than PBW's 1.24% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PBW Invesco WilderHill Clean Energy ETF	1.15%	0.79%	2.84%	3.68%	4.21%	1.71%	0.44%	1.45%	2.04%	1.28%	2.68%	1.53%
PKW Invesco BuyBack Achievers™ ETF	0.81%	0.99%	0.86%	1.17%	1.22%	0.72%	1.48%	1.30%	1.30%	0.65%	1.59%	1.14%

Frequently Asked Questions

Can I hold both PKW and PBW in my portfolio?

PKW and PBW have a correlation of 0.47, 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 PBW?

PBW has higher volatility (17.70%) compared to PKW (3.41%). In terms of maximum drawdown, PKW dropped -54.59% vs PBW's -89.02%.

Which ETF is better, PKW or PBW?

On 10-year performance, PKW leads with 13.51% vs 10.55% for PBW. On fees, PBW is cheaper at 0.61% per year. On volatility, PKW has been the lower-risk option at 3.41%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, PKW or PBW?

Over the 10-year period, PKW has performed better with a 13.51% return vs 10.55%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, PKW or PBW?

PBW is cheaper with a 0.61% expense ratio, compared with 0.62% for PKW.

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

PBW has the higher dividend yield at 1.24%, compared with 1.08% for PKW.

What is the main difference between PKW and PBW?

PKW is categorized as Mid Cap Value Equities, while PBW is Small Cap Growth Equities. PKW tracks NASDAQ US BuyBack Achievers Index, while PBW tracks The WilderHill Clean Energy Index (AMEX). Their fees differ too: 0.62% for PKW and 0.61% for PBW.

Which has better risk-adjusted returns?

PBW currently has the higher Sharpe Ratio (2.83 vs 1.25), 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.