PBW vs. PKW

Last updated Jun 23, 2026

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

Performance

PBW vs. PKW - Performance Comparison

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

Returns By Period

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

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%

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%

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

PBW vs. PKW - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
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%
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%

Correlation

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

PBW vs. PKW - Sectors Allocation Comparison

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

Return for Risk

PBW vs. PKW — Risk / Return Rank

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

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

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

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.

PBW vs. PKW - Risk-Adjusted Trends Comparison

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

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

PBW vs. PKW - Sharpe Ratio Comparison

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

PBW vs. PKW - Drawdown Comparison

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

Drawdown Indicators

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

Volatility

PBW vs. PKW - Volatility Comparison

Invesco WilderHill Clean Energy ETF (PBW) has a higher volatility of 17.70% compared to Invesco BuyBack Achievers™ ETF (PKW) at 3.41%. This indicates that PBW's price experiences larger fluctuations and is considered to be riskier than PKW based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

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

PBW vs. PKW - Expense Ratio Comparison

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

Dividends

PBW vs. PKW - Dividend Comparison

PBW's dividend yield for the trailing twelve months is around 1.24%, more than PKW's 1.08% 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 PBW and PKW in my portfolio?

PBW and PKW 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, PBW or PKW?

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

Which ETF is better, PBW or PKW?

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, PBW or PKW?

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, PBW or PKW?

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

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

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

What is the main difference between PBW and PKW?

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

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.