OIL STS INTL INC

Ticker: OIS CUSIP: 678026105 Class: Common Stock

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

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

Q2 2018

Shares 9,930 Value ($000) $319 Avg Close $33.64 Range $25.25 - $38.95

Q3 2015

Shares 13,149 Value ($000) $344 Avg Close $29.60 Range $23.35 - $37.27

Period	Shares	Value ($000)	Average Close	Price Range
Q2 2018	9,930	$319	$33.64	$25.25 - $38.95
Q3 2015	13,149	$344	$29.60	$23.35 - $37.27