William Blair & Company
BSX icon

William Blair & Company’s Boston Scientific BSX Stock Holding History

William Blair & Company’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 		$1.32M Sell
21,040
-95,658
-82% -$7.65M ﹤0.01% 851
2025
Q4 		$11.1M Buy
116,698
+1,520
+1% +$149K 0.03% 337
2025
Q3 		$11.2M Sell
115,178
-3,590
-3% -$372K 0.03% 336
2025
Q2 		$12.8M Buy
118,768
+826
+0.7% +$83.6K 0.04% 308
2025
Q1 		$11.9M Buy
117,942
+95,505
+426% +$9.62M 0.04% 306
2024
Q4 		$2M Buy
22,437
+2,461
+12% +$217K 0.01% 712
2024
Q3 		$1.67M Buy
19,976
+1,566
+9% +$123K ﹤0.01% 754
2024
Q2 		$1.42M Buy
18,410
+98
+0.5% +$7.17K ﹤0.01% 778
2024
Q1 		$1.25M Buy
18,312
+1,560
+9% +$100K ﹤0.01% 801
2023
Q4 		$968K Buy
16,752
+8,180
+95% +$437K ﹤0.01% 864
2023
Q3 		$453K Sell
8,572
-1,037
-11% -$54.4K ﹤0.01% 1089
2023
Q2 		$520K Sell
9,609
-95
-1% -$4.96K ﹤0.01% 1043
2023
Q1 		$485K Sell
9,704
-305
-3% -$14.4K ﹤0.01% 1060
2022
Q4 		$463K Sell
10,009
-863
-8% -$37.4K ﹤0.01% 1066
2022
Q3 		$421K Buy
10,872
+757
+7% +$30.4K ﹤0.01% 1104
2022
Q2 		$377K Sell
10,115
-3,169
-24% -$129K ﹤0.01% 1175
2022
Q1 		$588K Sell
13,284
-12,702
-49% -$550K ﹤0.01% 1101
2021
Q4 		$1.1M Buy
25,986
+11,544
+80% +$485K ﹤0.01% 918
2021
Q3 		$627K Sell
14,442
-2,170
-13% -$96K ﹤0.01% 1079
2021
Q2 		$710K Sell
16,612
-14,142
-46% -$595K ﹤0.01% 1033
2021
Q1 		$1.19M Buy
30,754
+337
+1% +$12.8K ﹤0.01% 842
2020
Q4 		$1.09M Sell
30,417
-9,941
-25% -$358K ﹤0.01% 819
2020
Q3 		$1.54M Buy
40,358
+14,464
+56% +$557K 0.01% 650
2020
Q2 		$909K Sell
25,894
-4,034
-13% -$145K ﹤0.01% 744
2020
Q1 		$977K Sell
29,928
-22,446
-43% -$877K 0.01% 672
2019
Q4 		$2.37M Sell
52,374
-227
-0.4% -$9.5K 0.01% 558
2019
Q3 		$2.14M Buy
52,601
+7,600
+17% +$322K 0.01% 557
2019
Q2 		$1.93M Sell
45,001
-4,462
-9% -$172K 0.01% 584
2019
Q1 		$1.9M Buy
49,463
+14,682
+42% +$561K 0.01% 578
2018
Q4 		$1.23M Buy
34,781
+5,950
+21% +$216K 0.01% 635
2018
Q3 		$1.11M Sell
28,831
-475
-2% -$16.6K 0.01% 710
2018
Q2 		$958K Sell
29,306
-18,365
-39% -$554K 0.01% 740
2018
Q1 		$1.3M Buy
47,671
+1,487
+3% +$40.4K 0.01% 641
2017
Q4 		$1.15M Buy
46,184
+728
+2% +$20.1K 0.01% 712
2017
Q3 		$1.33M Buy
45,456
+3,177
+8% +$87.7K 0.01% 656
2017
Q2 		$1.17M Sell
42,279
-1,100
-3% -$29.2K 0.01% 710
2017
Q1 		$1.06M Buy
43,379
+4,670
+12% +$114K 0.01% 688
2016
Q4 		$837K Sell
38,709
-723
-2% -$15.8K 0.01% 688
2016
Q3 		$938K Sell
39,432
-690
-2% -$16.5K 0.01% 666
2016
Q2 		$938K Buy
40,122
+1,226
+3% +$26.5K 0.01% 651
2016
Q1 		$731K Sell
38,896
-2,283
-6% -$40.1K 0.01% 694
2015
Q4 		$759K Buy
41,179
+6,500
+19% +$116K 0.01% 698
2015
Q3 		$569K Sell
34,679
-1,156
-3% -$19.8K ﹤0.01% 931
2015
Q2 		$634K Sell
35,835
-4,750
-12% -$84.9K ﹤0.01% 1693
2015
Q1 		$719K Buy
40,585
+18,836
+87% +$298K ﹤0.01% 1638
2014
Q4 		$287K Sell
21,749
-2,170
-9% -$27.7K ﹤0.01% 1874
2014
Q3 		$282K Sell
23,919
-17,715
-43% -$223K ﹤0.01% 1862
2014
Q2 		$532K Sell
41,634
-6,101
-13% -$79.3K ﹤0.01% 1652
2014
Q1 		$645K Buy
47,735
+1,814
+4% +$23.8K ﹤0.01% 1544
2013
Q4 		$551K Sell
45,921
-9,200
-17% -$109K ﹤0.01% 1562
2013
Q3 		$647K Buy
55,121
+27,742
+101% +$300K ﹤0.01% 1470
2013
Q2 		$253K Buy
+27,379
New +$232K ﹤0.01% 1735

Other funds holding BSX

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
JP Morgan Chase
JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return
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 $166B 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

William Blair & Company's BSX Position: Q1 2026 in Review

William Blair & Company reduced its Boston Scientific (BSX) stake by 82% in Q1 2026, selling an estimated $7.65M and leaving 21,040 shares worth $1.32M. The position accounts for ﹤0.01% of the portfolio, ranked #851.

William Blair & Company first reported a position in BSX in Q2 2013 and has held it in 52 quarters since. The position peaked at $12.8M in Q2 2025. 1,671 funds tracked by Wall St. Rank hold BSX as of Q1 2026.

  • William Blair & Company held 21,040 shares of Boston Scientific worth $1.32M as of Q1 2026.
  • William Blair & Company sold 95,658 Boston Scientific shares in Q1 2026, an estimated $7.65M.
  • Boston Scientific made up ﹤0.01% of William Blair & Company's portfolio in Q1 2026, its #851 holding.
  • William Blair & Company first reported a position in Boston Scientific in Q2 2013 and has held it in 52 quarters since.
  • William Blair & Company's Boston Scientific position peaked at $12.8M in Q2 2025.
  • 1,671 funds tracked by Wall St. Rank held Boston Scientific as of Q1 2026.

Based on William Blair & Company's 13F filing for Q1 2026, filed 8 May 2026.