ON ASSIGNMENT INC

CUSIP: 682159108 Class: COM

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q1 2018
Shares 143,951 Value ($000) $11,787 Avg Close — Range —
Q4 2017
Shares 181,351 Value ($000) $11,655 Avg Close — Range —
Q3 2017
Shares 61,063 Value ($000) $3,278 Avg Close — Range —