PATTERSON UTI ENERGY INC

Ticker: PTEN CUSIP: 703481101 Class: Common Stock

Grantham, Mayo, Van Otterloo & Co. LLC's Holding History (CIK: 0001352662)

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

Q3 2013

Shares 25,295 Value ($000) $541 Avg Close $20.54 Range $18.83 - $22.41

Q2 2013

Shares 43,210 Value ($000) $836 Avg Close $21.83 Range $18.96 - $25.12

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2013	25,295	$541	$20.54	$18.83 - $22.41
Q2 2013	43,210	$836	$21.83	$18.96 - $25.12