WTTR vs. PHO

Last updated Jun 4, 2026

WTTR (Select Energy Services, Inc.) is a stock, while PHO (Invesco Water Resources ETF) is Water Equities fund tracking the NASDAQ OMX US Water Index. Over the past 5 years, WTTR returned 25.38%/yr vs 5.22%/yr for PHO. At a 0.32 correlation, their price movements are largely independent.

Performance

WTTR vs. PHO - Performance Comparison

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

Returns By Period

In the year-to-date period, WTTR achieves a 82.22% return, which is significantly higher than PHO's -5.40% return.

WTTR

• 1D: 0.64%
• 1M: 14.27%
• YTD: 82.22%
• 6M: 71.62%
• 1Y: 127.63%
• 3Y*: 38.41%
• 5Y*: 25.38%
• 10Y*: —

PHO

• 1D: 0.30%
• 1M: -1.41%
• YTD: -5.40%
• 6M: -7.93%
• 1Y: -3.67%
• 3Y*: 7.71%
• 5Y*: 5.22%
• 10Y*: 11.55%

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

WTTR vs. PHO - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
WTTR Select Energy Services, Inc.	82.22%	-18.31%	79.17%	-15.63%	49.18%	51.95%	-55.82%	46.84%	-65.35%	30.10%
PHO Invesco Water Resources ETF	-5.40%	7.62%	8.59%	18.85%	-14.86%	31.28%	20.83%	37.57%	-6.40%	16.14%

Correlation

The correlation between WTTR and PHO is 0.24, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.24
Correlation (3Y) Calculated over the trailing 3-year period	0.32
Correlation (5Y) Calculated over the trailing 5-year period	0.28
Correlation (All Time) Calculated using the full available price history since Apr 24, 2017	0.32

Return for Risk

WTTR vs. PHO — Risk / Return Rank

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

WTTR

WTTR Risk / Return Rank: 93
WTTR Sharpe Ratio Rank: 94
WTTR Sortino Ratio Rank: 92
WTTR Omega Ratio Rank: 90
WTTR Calmar Ratio Rank: 94
WTTR Martin Ratio Rank: 94

PHO

PHO Risk / Return Rank: 6
PHO Sharpe Ratio Rank: 6
PHO Sortino Ratio Rank: 6
PHO Omega Ratio Rank: 6
PHO Calmar Ratio Rank: 6
PHO Martin Ratio Rank: 5

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.

WTTR vs. PHO - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Select Energy Services, Inc. (WTTR) and Invesco Water Resources ETF (PHO). 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.

	WTTR	PHO	Difference
Sharpe ratio: Return per unit of total volatility	2.93	-0.25	+3.18
Sortino ratio: Return per unit of downside risk	3.48	-0.25	+3.74
Omega ratio: Gain probability vs. loss probability	1.44	0.97	+0.47
Calmar ratio: Return relative to maximum drawdown	6.28	-0.27	+6.54
Martin ratio: Return relative to average drawdown	17.45	-0.69	+18.15
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

WTTR vs. PHO - Sharpe Ratio Comparison

The current WTTR Sharpe Ratio is 2.93, which is higher than the PHO Sharpe Ratio of -0.25. The chart below compares the historical Sharpe Ratios of WTTR and PHO, 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

	WTTR	PHO	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.93	-0.25	+3.18
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.51	0.29	+0.23
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.60	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.07	0.34	-0.27

Drawdowns

WTTR vs. PHO - Drawdown Comparison

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

Drawdown Indicators

	WTTR	PHO	Difference
Max Drawdown Largest peak-to-trough decline	-89.49%	-55.62%	-33.87%
Max Drawdown (1Y) Largest decline over 1 year	-20.45%	-13.78%	-6.67%
Max Drawdown (3Y) Largest decline over 3 years	-50.66%	-19.19%	-31.47%
Max Drawdown (5Y) Largest decline over 5 years	-50.66%	-28.60%	-22.06%
Max Drawdown (10Y) Largest decline over 10 years	—	-34.92%	—
Current Drawdown Current decline from peak	-5.29%	-10.62%	+5.33%
Average Drawdown Average peak-to-trough decline	-53.41%	-10.18%	-43.23%
Ulcer Index Depth and duration of drawdowns from previous peaks	7.34%	5.31%	+2.03%

Volatility

WTTR vs. PHO - Volatility Comparison

Select Energy Services, Inc. (WTTR) has a higher volatility of 10.96% compared to Invesco Water Resources ETF (PHO) at 4.01%. This indicates that WTTR's price experiences larger fluctuations and is considered to be riskier than PHO based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	WTTR	PHO	Difference
Volatility (1M) Calculated over the trailing 1-month period	10.96%	4.01%	+6.95%
Volatility (6M) Calculated over the trailing 6-month period	30.77%	10.92%	+19.85%
Volatility (1Y) Calculated over the trailing 1-year period	43.98%	15.03%	+28.95%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	49.91%	18.35%	+31.56%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	61.06%	19.45%	+41.61%

Dividends

WTTR vs. PHO - Dividend Comparison

WTTR's dividend yield for the trailing twelve months is around 1.48%, more than PHO's 0.58% 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%
WTTR Select Energy Services, Inc.	1.48%	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 WTTR and PHO in my portfolio?

WTTR and PHO have a correlation of 0.24, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, WTTR or PHO?

WTTR has higher volatility (10.96%) compared to PHO (4.01%). In terms of maximum drawdown, WTTR dropped -89.49% vs PHO's -55.62%.

Which has better risk-adjusted returns?

WTTR currently has the higher Sharpe Ratio (2.93 vs -0.25), 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.