LA
BSX icon

Lee Ainslie’s Boston Scientific BSX Stock Holding History

Lee Ainslie’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 		– Sell
-1,000,000
Closed -$62.8M – 196
2026
Q1 		$62.8M Buy
+1,000,000
New +$80M 0.72% 41

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

Lee Ainslie's BSX Position: Q2 2026 in Review

Lee Ainslie increased its Boston Scientific (BSX) stake by 42% in Q2 2026, buying an estimated $94.6M and bringing the position to 5,937,553 shares worth $253M. The position accounts for 2.24% of the portfolio, ranked #19.

Lee Ainslie first reported a position in BSX in Q1 2018 and has held it in 12 quarters since. The position peaked at $281M in Q4 2025. 1,468 funds tracked by Wall St. Rank hold BSX as of Q2 2026.

  • Lee Ainslie held 5,937,553 shares of Boston Scientific worth $253M as of Q2 2026.
  • Lee Ainslie bought 1,742,464 Boston Scientific shares in Q2 2026, an estimated $94.6M.
  • Boston Scientific made up 2.24% of Lee Ainslie's portfolio in Q2 2026, its #19 holding.
  • Lee Ainslie first reported a position in Boston Scientific in Q1 2018 and has held it in 12 quarters since.
  • Lee Ainslie's Boston Scientific position peaked at $281M in Q4 2025.
  • 1,468 funds tracked by Wall St. Rank held Boston Scientific as of Q2 2026.

Based on Maverick Capital's 13F filing for Q2 2026, filed 14 Aug 2026.