William Blair Investment Management
OSIS icon

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

William Blair Investment Management’s Portfolio OSIS Stock Details OSIS Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$45.6M Sell
171,667
-19,659
-10% -$5.44M 0.15% 143
2025
Q4 		$48.8M Buy
+191,326
New +$50M 0.14% 141
2017
Q3 		– Sell
-48,304
Closed -$3.63M – 451
2017
Q2 		$3.63M Sell
48,304
-69,612
-59% -$5.27M 0.01% 368
2017
Q1 		$8.61M Sell
117,916
-8,715
-7% -$647K 0.03% 318
2016
Q4 		$9.64M Buy
126,631
+22,409
+22% +$1.62M 0.04% 311
2016
Q3 		$6.81M Sell
104,222
-23,272
-18% -$1.47M 0.03% 336
2016
Q2 		$7.41M Buy
127,494
+1,365
+1% +$75.2K 0.03% 326
2016
Q1 		$8.26M Buy
126,129
+14,469
+13% +$958K 0.03% 306
2015
Q4 		$9.9M Sell
111,660
-39,935
-26% -$3.49M 0.04% 285
2015
Q3 		$11.7M Buy
+151,595
New +$10.9M 0.02% 649

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