ON ASSIGNMENT INC

CUSIP: 682159108 Class: COM

WELLINGTON MANAGEMENT GROUP LLP's Holding History (CIK: 0000902219)

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

Q1 2018
Shares 597,987 Value ($000) $48,963 Avg Close — Range —
Q4 2017
Shares 622,623 Value ($000) $40,016 Avg Close — Range —
Q3 2017
Shares 618,403 Value ($000) $33,196 Avg Close — Range —
Q2 2017
Shares 645,448 Value ($000) $34,951 Avg Close — Range —
Q1 2017
Shares 696,902 Value ($000) $33,821 Avg Close — Range —
Q4 2016
Shares 706,489 Value ($000) $31,199 Avg Close — Range —
Q3 2016
Shares 665,464 Value ($000) $24,150 Avg Close — Range —
Q2 2016
Shares 656,025 Value ($000) $24,240 Avg Close — Range —
Q1 2016
Shares 602,159 Value ($000) $22,232 Avg Close — Range —
Q4 2015
Shares 608,249 Value ($000) $27,341 Avg Close — Range —
Q3 2015
Shares 592,833 Value ($000) $21,876 Avg Close — Range —
Q2 2015
Shares 537,980 Value ($000) $21,132 Avg Close — Range —
Q1 2015
Shares 897,100 Value ($000) $34,421 Avg Close — Range —
Q4 2014
Shares 1,080,098 Value ($000) $35,849 Avg Close — Range —
Q3 2014
Shares 738,628 Value ($000) $19,832 Avg Close — Range —
Q2 2014
Shares 462,427 Value ($000) $16,448 Avg Close — Range —
Q1 2014
Shares 481,709 Value ($000) $18,589 Avg Close — Range —
Q4 2013
Shares 1,161,504 Value ($000) $40,559 Avg Close — Range —
Q3 2013
Shares 1,403,255 Value ($000) $46,308 Avg Close — Range —
Q2 2013
Shares 1,610,647 Value ($000) $43,036 Avg Close — Range —