William Blair Investment Management
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William Blair Investment Management’s Boston Scientific BSX Stock Holding History

William Blair Investment Management’s Portfolio BSX Stock Details BSX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$3.24M Buy
51,609
+70
+0.1% +$5.6K 0.01% 344
2025
Q4 		$4.91M Buy
+51,539
New +$5.05M 0.01% 336
2018
Q1 		– Sell
-1,017,823
Closed -$25.2M – 437
2017
Q4 		$25.2M Sell
1,017,823
-495,740
-33% -$13.7M 0.1% 215
2017
Q3 		$44.2M Sell
1,513,563
-19,892
-1% -$549K 0.16% 155
2017
Q2 		$42.5M Sell
1,533,455
-16,570
-1% -$440K 0.15% 158
2017
Q1 		$38.5M Sell
1,550,025
-37,986
-2% -$924K 0.15% 160
2016
Q4 		$34.3M Sell
1,588,011
-22,772
-1% -$497K 0.14% 170
2016
Q3 		$38.3M Buy
+1,610,783
New +$38.4M 0.15% 168

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Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
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JP Morgan Chase
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Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
D.E. Shaw & Co
D.E. Shaw & Co New York $127B AUM 43.98% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return