ASGN INC

Ticker: ASGN CUSIP: 00191U102 Class: Common Stock

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC's Holding History (CIK: 0001644956)

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

Q2 2018

Shares 4,450 Value ($000) $348 Avg Close $81.81 Range $74.11 - $85.91

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2018	4,450	$348	$81.81	$74.11 - $85.91