WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

DIMENSIONAL FUND ADVISORS LP's Holding History (CIK: 0000354204)

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

Q4 2017
Shares 2,848,889 Value ($000) $4,045 Avg Close — Range —
Q3 2017
Shares 2,826,876 Value ($000) $9,103 Avg Close — Range —
Q2 2017
Shares 2,455,337 Value ($000) $6,065 Avg Close — Range —
Q1 2017
Shares 2,264,318 Value ($000) $6,204 Avg Close — Range —
Q4 2016
Shares 2,124,820 Value ($000) $6,884 Avg Close — Range —
Q3 2016
Shares 2,158,696 Value ($000) $4,059 Avg Close — Range —
Q2 2016
Shares 2,104,854 Value ($000) $5,325 Avg Close — Range —
Q1 2016
Shares 1,984,485 Value ($000) $4,227 Avg Close — Range —
Q4 2015
Shares 1,942,886 Value ($000) $5,226 Avg Close — Range —
Q3 2015
Shares 1,835,004 Value ($000) $2,312 Avg Close — Range —
Q2 2015
Shares 2,169,923 Value ($000) $2,778 Avg Close — Range —
Q1 2015
Shares 2,308,371 Value ($000) $7,641 Avg Close — Range —
Q4 2014
Shares 2,344,096 Value ($000) $14,697 Avg Close — Range —
Q3 2014
Shares 2,518,879 Value ($000) $20,983 Avg Close — Range —
Q2 2014
Shares 2,424,460 Value ($000) $29,941 Avg Close — Range —
Q1 2014
Shares 2,285,510 Value ($000) $28,841 Avg Close — Range —
Q4 2013
Shares 2,304,813 Value ($000) $21,711 Avg Close — Range —
Q3 2013
Shares 2,417,210 Value ($000) $22,190 Avg Close — Range —
Q2 2013
Shares 2,346,926 Value ($000) $14,410 Avg Close — Range —