WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

BOKF, NA's Holding History (CIK: 0000009634)

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

Q1 2018
Shares 36,410 Value ($000) $20 Avg Close — Range —
Q4 2017
Shares 36,410 Value ($000) $52 Avg Close — Range —
Q3 2017
Shares 36,410 Value ($000) $117 Avg Close — Range —
Q2 2017
Shares 36,410 Value ($000) $90 Avg Close — Range —
Q1 2017
Shares 36,410 Value ($000) $100 Avg Close — Range —
Q4 2016
Shares 36,410 Value ($000) $118 Avg Close — Range —
Q3 2016
Shares 36,410 Value ($000) $68 Avg Close — Range —
Q3 2014
Shares 39,462 Value ($000) $329 Avg Close — Range —
Q2 2014
Shares 39,462 Value ($000) $487 Avg Close — Range —
Q1 2014
Shares 13,625 Value ($000) $172 Avg Close — Range —
Q4 2013
Shares 13,625 Value ($000) $128 Avg Close — Range —
Q3 2013
Shares 13,625 Value ($000) $125 Avg Close — Range —
Q2 2013
Shares 13,625 Value ($000) $84 Avg Close — Range —