WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO's Holding History (CIK: 0001007280)

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

Q1 2014
Shares 10,048 Value ($000) $127 Avg Close — Range —
Q4 2013
Shares 12,775 Value ($000) $120 Avg Close — Range —
Q3 2013
Shares 7,323 Value ($000) $67 Avg Close — Range —