Westfield Capital Management
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Westfield Capital Management’s Boston Scientific BSX Stock Holding History

Westfield Capital 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 		$1.47M Buy
34,378
+28,413
+476% +$1.54M ﹤0.01% 260
2026
Q1 		$374K Sell
5,965
-2,707
-31% -$217K ﹤0.01% 239
2025
Q4 		$827K Buy
8,672
+1,080
+14% +$106K ﹤0.01% 228
2025
Q3 		$741K Buy
7,592
+3,923
+107% +$406K ﹤0.01% 227
2025
Q2 		$394K Sell
3,669
-1,356
-27% -$137K ﹤0.01% 236
2025
Q1 		$507K Buy
5,025
+745
+17% +$75K ﹤0.01% 237
2024
Q4 		$382K Buy
4,280
+25
+0.6% +$2.2K ﹤0.01% 231
2024
Q3 		$357K Buy
+4,255
New +$335K ﹤0.01% 244
2022
Q1 		– Sell
-81,153
Closed -$3.45M – 239
2021
Q4 		$3.45M Sell
81,153
-1,921,076
-96% -$80.7M 0.02% 205
2021
Q3 		$86.9M Buy
2,002,229
+162,486
+9% +$7.19M 0.52% 66
2021
Q2 		$78.7M Sell
1,839,743
-1,231,876
-40% -$51.8M 0.47% 77
2021
Q1 		$119M Sell
3,071,619
-393,109
-11% -$14.9M 0.74% 39
2020
Q4 		$125M Buy
3,464,728
+462,115
+15% +$16.7M 0.74% 36
2020
Q3 		$115M Sell
3,002,613
-97,538
-3% -$3.76M 0.74% 40
2020
Q2 		$109M Buy
3,100,151
+1,165,267
+60% +$42M 0.75% 40
2020
Q1 		$63.1M Sell
1,934,884
-683,750
-26% -$26.7M 0.56% 57
2019
Q4 		$118M Buy
2,618,634
+647,200
+33% +$27.1M 0.84% 29
2019
Q3 		$80.2M Buy
+1,971,434
New +$83.5M 0.64% 53

Other funds holding BSX

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
California State Teachers Retirement System (CalSTRS)
California State Teachers Retirement System (CalSTRS) West Sacramento, California $782B AUM 28.39% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
D.E. Shaw & Co
D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return

Westfield Capital Management's BSX Position: Q2 2026 in Review

Westfield Capital Management increased its Boston Scientific (BSX) stake by 476% in Q2 2026, buying an estimated $1.54M and bringing the position to 34,378 shares worth $1.47M. The position accounts for ﹤0.01% of the portfolio, ranked #260.

Westfield Capital Management first reported a position in BSX in Q3 2019 and has held it in 18 quarters since. The position peaked at $125M in Q4 2020. 1,470 funds tracked by Wall St. Rank hold BSX as of Q2 2026.

  • Westfield Capital Management held 34,378 shares of Boston Scientific worth $1.47M as of Q2 2026.
  • Westfield Capital Management bought 28,413 Boston Scientific shares in Q2 2026, an estimated $1.54M.
  • Boston Scientific made up ﹤0.01% of Westfield Capital Management's portfolio in Q2 2026, its #260 holding.
  • Westfield Capital Management first reported a position in Boston Scientific in Q3 2019 and has held it in 18 quarters since.
  • Westfield Capital Management's Boston Scientific position peaked at $125M in Q4 2020.
  • 1,470 funds tracked by Wall St. Rank held Boston Scientific as of Q2 2026.

Based on Westfield Capital Management's 13F filing for Q2 2026, filed 12 Aug 2026.