ON ASSIGNMENT INC

CUSIP: 682159108 Class: COM

CITADEL ADVISORS LLC's Holding History (CIK: 0001423053)

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

Q1 2018
Shares 593,851 Value ($000) $48,624 Avg Close — Range —
Q4 2017
Shares 707,657 Value ($000) $45,481 Avg Close — Range —
Q3 2017
Shares 33,187 Value ($000) $1,781 Avg Close — Range —
Q2 2017
Shares 497,975 Value ($000) $26,965 Avg Close — Range —
Q1 2017
Shares 811,709 Value ($000) $39,392 Avg Close — Range —
Q4 2016
Shares 111,314 Value ($000) $4,916 Avg Close — Range —
Q3 2016
Shares 35,221 Value ($000) $1,278 Avg Close — Range —
Q2 2016
Shares 21,944 Value ($000) $811 Avg Close — Range —
Q1 2016
Shares 100,095 Value ($000) $3,696 Avg Close — Range —
Q4 2015
Shares 64,565 Value ($000) $2,903 Avg Close — Range —
Q2 2015
Shares 165 Value ($000) $6 Avg Close — Range —
Q1 2015
Shares 46,812 Value ($000) $1,796 Avg Close — Range —
Q4 2014
Shares 50,851 Value ($000) $1,688 Avg Close — Range —
Q3 2014
Shares 29,059 Value ($000) $780 Avg Close — Range —
Q2 2014
Shares 506,127 Value ($000) $18,003 Avg Close — Range —
Q1 2014
Shares 730,876 Value ($000) $28,205 Avg Close — Range —
Q4 2013
Shares 57,079 Value ($000) $1,993 Avg Close — Range —
Q3 2013
Shares 30,797 Value ($000) $1,017 Avg Close — Range —
Q2 2013
Shares 22,703 Value ($000) $607 Avg Close — Range —