PHO vs. PIO

Last updated Aug 2, 2026

PHO (Invesco Water Resources ETF) and PIO (Invesco Global Water ETF) are both Water Equities funds from Invesco - PHO tracks the NASDAQ OMX US Water Index while PIO tracks the NASDAQ OMX Global Water Index. Both are passively managed. Over the past 10 years, PHO returned 11.81%/yr vs 8.71%/yr for PIO. Their correlation of 0.81 means they have usually moved in the same direction. PHO charges 0.59%/yr vs 0.75%/yr for PIO.

Performance

PHO vs. PIO - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco Water Resources ETF (PHO) and Invesco Global Water ETF (PIO). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

Over the past 10 years, PHO has outperformed PIO with an annualized return of 11.81%, while PIO has yielded a comparatively lower 8.71% annualized return.

PHO

• 1D: 0.27%
• 1M: 0.72%
• 6M: -2.83%
• YTD: 0.00%
• 1Y: 0.79%
• 3Y*: 7.24%
• 5Y*: 4.87%
• 10Y*: 11.81%
• ALL TIME*: 8.29%

PIO

• 1D: 0.36%
• 1M: -1.36%
• 6M: -2.92%
• YTD: 2.47%
• 1Y: 3.32%
• 3Y*: 7.98%
• 5Y*: 2.43%
• 10Y*: 8.71%
• ALL TIME*: 4.54%

*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)
PHO Invesco Water Resources ETF	$6.69M	$5.70M	$8.61M
PIO Invesco Global Water ETF	$316.94K	$288.77K	$459.19K

PHO vs. PIO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PHO Invesco Water Resources ETF	0.00%	7.62%	8.59%	18.85%	-14.86%	31.28%	20.83%	37.57%	-6.40%	23.55%
PIO Invesco Global Water ETF	2.47%	14.25%	-0.44%	22.19%	-24.06%	25.97%	14.22%	35.59%	-9.71%	26.52%

Correlation

The correlation between PHO and PIO is 0.82, 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.	0.82
Correlation (3Y) Balances recent behavior with more history.	0.83
Correlation (5Y) Shows whether the relationship held over a longer period.	0.85
Correlation (10Y) Provides a long-term view across more market conditions.	0.82
Correlation (All Time) Calculated using the full available price history since Jun 13, 2007	0.81

The correlation between PHO and PIO has been stable across timeframes, ranging from 0.81 to 0.85 - a consistent structural relationship.

PHO vs. PIO - Sectors Allocation Comparison

Sectors	PHO	PIO
Industrials	50.1%	53.0%
Healthcare	16.7%	10.2%
Technology	16.5%	8.1%
Basic Materials	9.3%	9.6%
Utilities	7.5%	17.6%
Financial Services	0.0%	0.0%
Communication Services	-	-
Consumer Cyclical	-	1.6%
Consumer Defensive	-	-
Energy	-	-
Real Estate	-	-

Return for Risk

PHO vs. PIO — Risk / Return Rank

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

PHO

PHO Risk / Return Rank: 11
PHO Sharpe Ratio Rank: 11
PHO Sortino Ratio Rank: 11
PHO Omega Ratio Rank: 10
PHO Calmar Ratio Rank: 11
PHO Martin Ratio Rank: 11

PIO

PIO Risk / Return Rank: 14
PIO Sharpe Ratio Rank: 15
PIO Sortino Ratio Rank: 14
PIO Omega Ratio Rank: 14
PIO Calmar Ratio Rank: 15
PIO Martin Ratio Rank: 14

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.

PHO vs. PIO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Water Resources ETF (PHO) and Invesco Global Water ETF (PIO). 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.

	PHO	PIO	Difference
Sharpe ratio: Return per unit of total volatility	0.01	0.20	-0.18
Sortino ratio: Return per unit of downside risk	0.13	0.39	-0.25
Omega ratio: Gain probability vs. loss probability	1.01	1.04	-0.03
Calmar ratio: Return relative to maximum drawdown	0.01	0.23	-0.22
Martin ratio: Return relative to average drawdown	0.03	0.54	-0.51

PHO vs. PIO - Sharpe Ratio Comparison

The current PHO Sharpe Ratio is 0.01, which is lower than the PIO Sharpe Ratio of 0.20. The chart below compares the historical Sharpe Ratios of PHO and PIO, 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

PHO vs. PIO - Drawdown Comparison

The maximum PHO drawdown since its inception was -55.62%, smaller than the maximum PIO drawdown of -64.88%. Use the drawdown chart below to compare losses from any high point for PHO and PIO.

Drawdown Indicators

	PHO	PIO	Difference
Max Drawdown Largest peak-to-trough decline	-55.62%	-64.88%	+9.26%
Max Drawdown (1Y) Largest decline over 1 year	-13.78%	-13.14%	-0.64%
Max Drawdown (3Y) Largest decline over 3 years	-19.19%	-17.08%	-2.11%
Max Drawdown (5Y) Largest decline over 5 years	-28.60%	-34.27%	+5.67%
Max Drawdown (10Y) Largest decline over 10 years	-34.92%	-35.76%	+0.84%
Current Drawdown Current decline from peak	-5.52%	-6.96%	+1.44%
Average Drawdown Average peak-to-trough decline	-10.17%	-15.36%	+5.19%
Ulcer Index Depth and duration of drawdowns from previous peaks	6.24%	5.56%	+0.68%

Volatility

PHO vs. PIO - Volatility Comparison

Invesco Water Resources ETF (PHO) has a higher volatility of 5.89% compared to Invesco Global Water ETF (PIO) at 4.33%. This indicates that PHO's price experiences larger fluctuations and is considered to be riskier than PIO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PHO	PIO	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.89%	4.33%	+1.56%
Volatility (6M) Calculated over the trailing 6-month period	12.02%	12.71%	-0.69%
Volatility (1Y) Calculated over the trailing 1-year period	16.07%	15.35%	+0.72%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.52%	17.74%	+0.78%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.50%	18.14%	+1.36%

PHO vs. PIO - Expense Ratio Comparison

PHO has a 0.59% expense ratio, which is lower than PIO's 0.75% expense ratio.

Dividends

PHO vs. PIO - Dividend Comparison

PHO's dividend yield for the trailing twelve months is around 0.58%, less than PIO's 0.90% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PHO Invesco Water Resources ETF	0.58%	0.54%	0.45%	0.59%	0.49%	0.20%	0.39%	0.43%	0.46%	0.34%	0.47%	0.75%
PIO Invesco Global Water ETF	0.90%	1.04%	0.78%	0.84%	1.02%	1.19%	0.88%	1.20%	2.00%	1.00%	1.45%	1.63%

Frequently Asked Questions

Can I hold both PHO and PIO in my portfolio?

PHO and PIO have a correlation of 0.82, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, PHO or PIO?

PHO has higher volatility (5.89%) compared to PIO (4.33%). In terms of maximum drawdown, PHO dropped -55.62% vs PIO's -64.88%.

Which ETF is better, PHO or PIO?

On 10-year performance, PHO leads with 11.81% vs 8.71% for PIO. On fees, PHO is cheaper at 0.59% per year. On volatility, PIO has been the lower-risk option at 4.33%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, PHO or PIO?

Over the 10-year period, PHO has performed better with a 11.81% return vs 8.71%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, PHO or PIO?

PHO is cheaper with a 0.59% expense ratio, compared with 0.75% for PIO.

Which ETF pays a higher dividend yield, PHO or PIO?

PIO has the higher dividend yield at 0.90%, compared with 0.58% for PHO.

What is the main difference between PHO and PIO?

PHO tracks NASDAQ OMX US Water Index, while PIO tracks NASDAQ OMX Global Water Index. Their fees differ too: 0.59% for PHO and 0.75% for PIO.

Which has better risk-adjusted returns?

PIO currently has the higher Sharpe Ratio (0.20 vs 0.01), 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.