WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS's Holding History (CIK: 0001083190)

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

Q2 2015
Shares 71,385 Value ($000) $91 Avg Close — Range —