PIONEER DRILLING COMPANY

CUSIP: 723655106 Class: COMMON STOCK

GLENMEDE TRUST CO NA's Holding History (CIK: 0000314949)

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

Q4 2007

Shares 215,296 Value ($000) $2,859 Avg Close — Range —

Q3 2007

Shares 173,218 Value ($000) $2,109 Avg Close — Range —

Q2 2007

Shares 171,718 Value ($000) $2,560 Avg Close — Range —

Q1 2007

Shares 194,921 Value ($000) $2,473 Avg Close — Range —

Q4 2006

Shares 215,296 Value ($000) $2,859 Avg Close — Range —

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2007	215,296	$2,859	—	—
Q3 2007	173,218	$2,109	—	—
Q2 2007	171,718	$2,560	—	—
Q1 2007	194,921	$2,473	—	—
Q4 2006	215,296	$2,859	—	—