PIONEER ENERGY SVCS CORP

CUSIP: 723664108 Class: COM

MARSHALL WACE, LLP's Holding History (CIK: 0001318757)

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

Q4 2016
Shares 745,106 Value ($000) $5,104 Avg Close — Range —
Q1 2015
Shares 13,557 Value ($000) $73 Avg Close — Range —
Q4 2014
Shares 13,557 Value ($000) $75 Avg Close — Range —