PROPETRO HLDG CORP

Ticker: PUMP CUSIP: 74347M108 Class: Common Stock

Sterling Investment Advisors, Ltd.'s Holding History (CIK: 0001701132)

Note: Option positions (PUT/CALL) are excluded.

Q2 2019

Shares 2,000 Value ($000) $41 Avg Close $21.24 Range $17.63 - $25.38

Q1 2019

Shares 2,000 Value ($000) $45 Avg Close $17.90 Range $11.78 - $23.32

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2019	2,000	$41	$21.24	$17.63 - $25.38
Q1 2019	2,000	$45	$17.90	$11.78 - $23.32