Willbros Group

CUSIP: 969199108 Class: COM

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

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

Q4 2008
Shares 11,462 Value ($000) $97 Avg Close — Range —
Q3 2008
Shares 7,020 Value ($000) $186 Avg Close — Range —
Q2 2008
Shares 7,020 Value ($000) $307 Avg Close — Range —
Q1 2008
Shares 3,858 Value ($000) $118 Avg Close — Range —