WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

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

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

Q2 2010
Shares 20,381 Value ($000) $150 Avg Close — Range —
Q2 2009
Shares 11,462 Value ($000) $143 Avg Close — Range —
Q1 2009
Shares 11,462 Value ($000) $111 Avg Close — Range —