William Blair Investment Management
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William Blair Investment Management’s OSI Systems OSIS Stock Holding History

William Blair Investment Management’s Portfolio OSIS Stock Details OSIS Fund Activity
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Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		$48.8M Buy
2017
Q3 		– Sell
2017
Q2 		$3.63M Sell
2017
Q1 		$8.61M Sell
2016
Q4 		$9.64M Buy
2016
Q3 		$6.81M Sell
2016
Q2 		$7.41M Buy
2016
Q1 		$8.26M Buy
2015
Q4 		$9.9M Sell
2015
Q3 		$11.7M Buy