WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q4 2016
Shares 300 Value ($000) $1 Avg Close — Range —
Q2 2016
Shares 651 Value ($000) $2 Avg Close — Range —
Q1 2016
Shares 800 Value ($000) $2 Avg Close — Range —
Q4 2015
Shares 800 Value ($000) $2 Avg Close — Range —
Q3 2015
Shares 1,900 Value ($000) $2 Avg Close — Range —
Q2 2015
Shares 1,900 Value ($000) $2 Avg Close — Range —
Q1 2015
Shares 1,600 Value ($000) $5 Avg Close — Range —
Q3 2014
Shares 2,669 Value ($000) $22 Avg Close — Range —
Q2 2014
Shares 3,059 Value ($000) $38 Avg Close — Range —
Q1 2014
Shares 2,889 Value ($000) $36 Avg Close — Range —
Q4 2013
Shares 3,068 Value ($000) $29 Avg Close — Range —
Q3 2013
Shares 1,869 Value ($000) $17 Avg Close — Range —
Q2 2013
Shares 1,530 Value ($000) $9 Avg Close — Range —