WILLBROS GROUP INC DEL

CUSIP: 969203108 Class: COMMON STOCK

CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM's Holding History (CIK: 0000919079)

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

Q1 2018
Shares 353,900 Value ($000) $196 Avg Close — Range —
Q4 2017
Shares 465,956 Value ($000) $662 Avg Close — Range —
Q3 2017
Shares 465,956 Value ($000) $1,500 Avg Close — Range —
Q2 2017
Shares 391,400 Value ($000) $967 Avg Close — Range —
Q1 2017
Shares 403,100 Value ($000) $1,104 Avg Close — Range —
Q4 2016
Shares 353,900 Value ($000) $1,147 Avg Close — Range —
Q3 2016
Shares 353,900 Value ($000) $665 Avg Close — Range —
Q2 2016
Shares 353,900 Value ($000) $895 Avg Close — Range —
Q1 2016
Shares 392,829 Value ($000) $837 Avg Close — Range —
Q4 2015
Shares 632,029 Value ($000) $1,700 Avg Close — Range —
Q3 2015
Shares 636,329 Value ($000) $802 Avg Close — Range —
Q2 2015
Shares 498,229 Value ($000) $638 Avg Close — Range —
Q1 2015
Shares 414,229 Value ($000) $2,403 Avg Close — Range —
Q4 2014
Shares 414,229 Value ($000) $2,403 Avg Close — Range —
Q3 2014
Shares 164,029 Value ($000) $1,366 Avg Close — Range —
Q2 2014
Shares 164,229 Value ($000) $2,028 Avg Close — Range —
Q1 2014
Shares 98,400 Value ($000) $1,186 Avg Close — Range —
Q4 2013
Shares 137,000 Value ($000) $1,247 Avg Close — Range —
Q3 2013
Shares 138,833 Value ($000) $1,274 Avg Close — Range —
Q2 2013
Shares 138,833 Value ($000) $852 Avg Close — Range —