WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

NORTHERN TRUST CORP's Holding History (CIK: 0000073124)

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

Q4 2017
Shares 502,127 Value ($000) $713 Avg Close — Range —
Q3 2017
Shares 500,609 Value ($000) $1,612 Avg Close — Range —
Q2 2017
Shares 499,507 Value ($000) $1,234 Avg Close — Range —
Q1 2017
Shares 480,238 Value ($000) $1,316 Avg Close — Range —
Q4 2016
Shares 468,842 Value ($000) $1,519 Avg Close — Range —
Q3 2016
Shares 457,488 Value ($000) $860 Avg Close — Range —
Q2 2016
Shares 455,273 Value ($000) $1,152 Avg Close — Range —
Q1 2016
Shares 105,162 Value ($000) $224 Avg Close — Range —
Q4 2015
Shares 99,656 Value ($000) $268 Avg Close — Range —
Q3 2015
Shares 150,156 Value ($000) $189 Avg Close — Range —
Q2 2015
Shares 442,789 Value ($000) $566 Avg Close — Range —
Q1 2015
Shares 469,566 Value ($000) $1,554 Avg Close — Range —
Q4 2014
Shares 481,858 Value ($000) $3,021 Avg Close — Range —
Q3 2014
Shares 501,276 Value ($000) $4,176 Avg Close — Range —
Q2 2014
Shares 494,371 Value ($000) $6,105 Avg Close — Range —
Q1 2014
Shares 548,353 Value ($000) $6,920 Avg Close — Range —
Q4 2013
Shares 574,931 Value ($000) $5,415 Avg Close — Range —
Q3 2013
Shares 575,636 Value ($000) $5,285 Avg Close — Range —
Q2 2013
Shares 588,381 Value ($000) $3,613 Avg Close — Range —