ON ASSIGNMENT INC

CUSIP: 682159108 Class: COM

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q2 2016
Shares 5,056 Value ($000) $187 Avg Close — Range —
Q1 2016
Shares 2,352 Value ($000) $87 Avg Close — Range —
Q3 2015
Shares 11,174 Value ($000) $412 Avg Close — Range —
Q2 2015
Shares 3,607 Value ($000) $142 Avg Close — Range —
Q1 2015
Shares 4,507 Value ($000) $173 Avg Close — Range —
Q3 2013
Shares 2,194 Value ($000) $72 Avg Close — Range —
Q2 2013
Shares 728 Value ($000) $19 Avg Close — Range —