GREY WOLF INC

CUSIP: 397888108 Class: COMMON

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

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

Q4 2007
Shares 386,277 Value ($000) $2,649 Avg Close — Range —
Q3 2007
Shares 331,032 Value ($000) $2,168 Avg Close — Range —
Q2 2007
Shares 328,032 Value ($000) $2,702 Avg Close — Range —
Q1 2007
Shares 328,032 Value ($000) $2,197 Avg Close — Range —
Q4 2006
Shares 386,277 Value ($000) $2,649 Avg Close — Range —