WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

TEACHER RETIREMENT SYSTEM OF TEXAS's Holding History (CIK: 0000796848)

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

Q1 2015
Shares 1,226 Value ($000) $4 Avg Close — Range —
Q4 2014
Shares 1,200 Value ($000) $8 Avg Close — Range —
Q3 2014
Shares 1,456 Value ($000) $12 Avg Close — Range —
Q2 2014
Shares 1,456 Value ($000) $18 Avg Close — Range —
Q1 2014
Shares 1,309 Value ($000) $17 Avg Close — Range —
Q4 2013
Shares 1,484 Value ($000) $14 Avg Close — Range —
Q3 2013
Shares 5,123 Value ($000) $47 Avg Close — Range —
Q2 2013
Shares 2,675 Value ($000) $16 Avg Close — Range —