PATTERSON UTI ENERGY INC

Ticker: PTEN CUSIP: 703481101 Class: Common Stock

VIKING GLOBAL INVESTORS LP's Holding History (CIK: 0001103804)

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

Q3 2018

Shares 4,563,526 Value ($000) $78,082 Avg Close $17.18 Range $14.60 - $19.29

Q2 2018

Shares 6,290,008 Value ($000) $113,220 Avg Close $20.05 Range $16.61 - $23.99

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2018	4,563,526	$78,082	$17.18	$14.60 - $19.29
Q2 2018	6,290,008	$113,220	$20.05	$16.61 - $23.99