PHO vs. WTTR

Last updated Jul 14, 2026

PHO (Invesco Water Resources ETF) is Water Equities fund tracking the NASDAQ OMX US Water Index, while WTTR (Select Energy Services, Inc.) is a stock. Over the past 5 years, PHO returned 5.33%/yr vs 30.23%/yr for WTTR. At a 0.31 correlation, their price movements are largely independent.

Performance

PHO vs. WTTR - Performance Comparison

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

Returns By Period

In the year-to-date period, PHO achieves a -1.81% return, which is significantly lower than WTTR's 87.69% return.

PHO

• 1D: -0.21%
• 1M: 3.32%
• 6M: -5.27%
• YTD: -1.81%
• 1Y: -2.44%
• 3Y*: 7.17%
• 5Y*: 5.33%
• 10Y*: 11.55%

WTTR

• 1D: 1.56%
• 1M: 3.38%
• 6M: 75.05%
• YTD: 87.69%
• 1Y: 107.93%
• 3Y*: 36.90%
• 5Y*: 30.23%
• 10Y*: —

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

PHO vs. WTTR - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PHO Invesco Water Resources ETF	-1.81%	7.62%	8.59%	18.85%	-14.86%	31.28%	20.83%	37.57%	-6.40%	16.31%
WTTR Select Energy Services, Inc.	87.69%	-18.31%	79.17%	-15.63%	49.18%	51.95%	-55.82%	46.84%	-65.35%	22.42%

Correlation

The correlation between PHO and WTTR is 0.19, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.19
Correlation (3Y) Calculated over the trailing 3-year period	0.28
Correlation (5Y) Calculated over the trailing 5-year period	0.27
Correlation (All Time) Calculated using the full available price history since Apr 21, 2017	0.31

The correlation between PHO and WTTR shifts across timeframes, from 0.19 (1 year) to 0.31 (all time), reflecting how their relationship changes across market environments.

Return for Risk

PHO vs. WTTR — Risk / Return Rank

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

PHO

PHO Risk / Return Rank: 7
PHO Sharpe Ratio Rank: 8
PHO Sortino Ratio Rank: 7
PHO Omega Ratio Rank: 7
PHO Calmar Ratio Rank: 7
PHO Martin Ratio Rank: 7

WTTR

WTTR Risk / Return Rank: 93
WTTR Sharpe Ratio Rank: 95
WTTR Sortino Ratio Rank: 92
WTTR Omega Ratio Rank: 91
WTTR Calmar Ratio Rank: 95
WTTR Martin Ratio Rank: 94

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.

PHO vs. WTTR - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Water Resources ETF (PHO) and Select Energy Services, Inc. (WTTR). 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	WTTR	Difference
Sharpe ratio: Return per unit of total volatility	-0.16	2.44	-2.60
Sortino ratio: Return per unit of downside risk	-0.12	3.01	-3.12
Omega ratio: Gain probability vs. loss probability	0.99	1.38	-0.39
Calmar ratio: Return relative to maximum drawdown	-0.18	5.31	-5.48
Martin ratio: Return relative to average drawdown	-0.41	14.27	-14.67

PHO vs. WTTR - Sharpe Ratio Comparison

The current PHO Sharpe Ratio is -0.16, which is lower than the WTTR Sharpe Ratio of 2.44. The chart below compares the historical Sharpe Ratios of PHO and WTTR, 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. WTTR - Drawdown Comparison

The maximum PHO drawdown since its inception was -55.62%, smaller than the maximum WTTR drawdown of -89.49%. Use the drawdown chart below to compare losses from any high point for PHO and WTTR.

Drawdown Indicators

	PHO	WTTR	Difference
Max Drawdown Largest peak-to-trough decline	-55.62%	-89.49%	+33.87%
Max Drawdown (1Y) Largest decline over 1 year	-13.78%	-20.45%	+6.67%
Max Drawdown (3Y) Largest decline over 3 years	-19.19%	-50.66%	+31.47%
Max Drawdown (5Y) Largest decline over 5 years	-28.60%	-50.66%	+22.06%
Max Drawdown (10Y) Largest decline over 10 years	-34.92%	—	—
Current Drawdown Current decline from peak	-7.23%	-2.45%	-4.78%
Average Drawdown Average peak-to-trough decline	-10.17%	-52.87%	+42.70%
Ulcer Index Depth and duration of drawdowns from previous peaks	6.01%	7.61%	-1.60%

Volatility

PHO vs. WTTR - Volatility Comparison

The current volatility for Invesco Water Resources ETF (PHO) is 4.61%, while Select Energy Services, Inc. (WTTR) has a volatility of 11.99%. This indicates that PHO experiences smaller price fluctuations and is considered to be less risky than WTTR based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PHO	WTTR	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.61%	11.99%	-7.38%
Volatility (6M) Calculated over the trailing 6-month period	11.56%	30.34%	-18.78%
Volatility (1Y) Calculated over the trailing 1-year period	15.43%	44.54%	-29.11%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.43%	49.53%	-31.10%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.45%	60.90%	-41.45%

Dividends

PHO vs. WTTR - Dividend Comparison

PHO's dividend yield for the trailing twelve months is around 0.59%, less than WTTR's 1.43% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PHO Invesco Water Resources ETF	0.59%	0.54%	0.45%	0.59%	0.49%	0.20%	0.39%	0.43%	0.46%	0.34%	0.47%	0.75%
WTTR Select Energy Services, Inc.	1.43%	2.66%	1.89%	2.77%	0.54%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both PHO and WTTR in my portfolio?

PHO and WTTR have a correlation of 0.19, 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 WTTR?

WTTR has higher volatility (11.99%) compared to PHO (4.61%). In terms of maximum drawdown, PHO dropped -55.62% vs WTTR's -89.49%.

Which has better risk-adjusted returns?

WTTR currently has the higher Sharpe Ratio (2.44 vs -0.16), 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.