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 Q2	$1.98M	Sell	46,375 -5,234	-10%	-$284K	0.01%	343
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

Other funds holding BSX

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.38T AUM 44.17% 1-Year Est. Return

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

William Blair Investment Management's BSX Position: Q2 2026 in Review

William Blair Investment Management reduced its Boston Scientific (BSX) stake by 10% in Q2 2026, selling an estimated $284K and leaving 46,375 shares worth $1.98M. The position accounts for 0.01% of the portfolio, ranked #343.

William Blair Investment Management first reported a position in BSX in Q3 2016 and has held it in 9 quarters since. The position peaked at $44.2M in Q3 2017. 1,487 funds tracked by Wall St. Rank hold BSX as of Q2 2026.

William Blair Investment Management held 46,375 shares of Boston Scientific worth $1.98M as of Q2 2026.
William Blair Investment Management sold 5,234 Boston Scientific shares in Q2 2026, an estimated $284K.
Boston Scientific made up 0.01% of William Blair Investment Management's portfolio in Q2 2026, its #343 holding.
William Blair Investment Management first reported a position in Boston Scientific in Q3 2016 and has held it in 9 quarters since.
William Blair Investment Management's Boston Scientific position peaked at $44.2M in Q3 2017.
1,487 funds tracked by Wall St. Rank held Boston Scientific as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.