WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

PRINCIPAL FINANCIAL GROUP INC's Holding History (CIK: 0001126328)

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

Q2 2017
Shares 10,120 Value ($000) $25 Avg Close — Range —
Q1 2015
Shares 11,019 Value ($000) $36 Avg Close — Range —
Q4 2014
Shares 11,118 Value ($000) $70 Avg Close — Range —
Q3 2014
Shares 13,072 Value ($000) $109 Avg Close — Range —
Q2 2014
Shares 13,072 Value ($000) $161 Avg Close — Range —
Q4 2013
Shares 16,979 Value ($000) $160 Avg Close — Range —
Q3 2013
Shares 17,293 Value ($000) $159 Avg Close — Range —
Q2 2013
Shares 18,400 Value ($000) $113 Avg Close — Range —