Marshall Wace
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Marshall Wace’s Boston Scientific BSX Stock Holding History

Marshall Wace’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 		$38.4K Buy
900
+700
+350% +$38K ﹤0.01% 3006
2026
Q1 		$12.6K Sell
200
-499,800
-100% -$40M ﹤0.01% 3083
2025
Q4 		$47.7M Buy
+500,000
New +$49M 0.04% 354

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

Marshall Wace's BSX Position: Q2 2026 in Review

Marshall Wace reduced its Boston Scientific (BSX) stake by 33% in Q2 2026, selling an estimated $65M and leaving 2,414,223 shares worth $103M. The position accounts for 0.08% of the portfolio, ranked #193.

Marshall Wace first reported a position in BSX in Q3 2014 and has held it in 47 quarters since. The position peaked at $957M in Q3 2025. 1,477 funds tracked by Wall St. Rank hold BSX as of Q2 2026.

  • Marshall Wace held 2,414,223 shares of Boston Scientific worth $103M as of Q2 2026.
  • Marshall Wace sold 1,196,797 Boston Scientific shares in Q2 2026, an estimated $65M.
  • Boston Scientific made up 0.08% of Marshall Wace's portfolio in Q2 2026, its #193 holding.
  • Marshall Wace first reported a position in Boston Scientific in Q3 2014 and has held it in 47 quarters since.
  • Marshall Wace's Boston Scientific position peaked at $957M in Q3 2025.
  • 1,477 funds tracked by Wall St. Rank held Boston Scientific as of Q2 2026.

Based on Marshall Wace's 13F filing for Q2 2026, filed 13 Aug 2026.