PATTERSON UTI ENERGY INC

Ticker: PTEN CUSIP: 703481101 Class: Common Stock

ADVENT CAPITAL MANAGEMENT /DE/'s Holding History (CIK: 0001097278)

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

Q4 2015

Shares 35,040 Value ($000) $532 Avg Close $15.38 Range $12.82 - $17.45

Q4 2013

Shares 10,000 Value ($000) $253 Avg Close $23.93 Range $21.29 - $26.09

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2015	35,040	$532	$15.38	$12.82 - $17.45
Q4 2013	10,000	$253	$23.93	$21.29 - $26.09