ON ASSIGNMENT INC

CUSIP: 682159108 Class: COM

CASTLEARK MANAGEMENT LLC's Holding History (CIK: 0001106832)

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

Q4 2013
Shares 157,241 Value ($000) $5,491 Avg Close — Range —
Q2 2013
Shares 202,183 Value ($000) $5,402 Avg Close — Range —