Lee Ainslie's BSX Position Overview
Lee Ainslie (via Maverick Capital LTD) currently holds 4.2 M shares of Boston Scientific Corporation (BSX) worth $263.24 M, representing 3.04% of the portfolio. First purchased in 2018-Q1, this medium-term investment has been held for 15 quarters.
Based on 13F filings, Lee Ainslie has maintained a strategic position in BSX, demonstrating sustained confidence in this investment. Largest addition occurred in Q4 2025, adding 2.94 M shares. Largest reduction occurred in Q1 2019, reducing 77,730 shares.
Analysis based on 13F filings available since 2013 Q2
Lee Ainslie's Boston Scientific Corporation (BSX) Holding Value Over Time
Track share changes against reported price movement
Quarterly Boston Scientific Corporation (BSX) Trades by Lee Ainslie
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q1 2026 | +1.25 M | Add 42.48% | 4.2 M | $62.75 |
| Q4 2025 | +2.94 M | New Buy | 2.94 M | $95.35 |
| Q2 2024 | -5,748 | Sold Out | 0 | $0.00 |
| Q1 2024 | -3,083 | Reduce 34.91% | 5,748 | $68.49 |
| Q4 2023 | +8,831 | New Buy | 8,831 | $57.81 |
| Q4 2021 | -62,528 | Sold Out | 0 | $0.00 |
| Q3 2021 | -32,668 | Reduce 34.32% | 62,528 | $43.39 |
| Q2 2021 | +62,070 | Add 187.38% | 95,196 | $42.76 |
| Q1 2021 | -36,915 | Reduce 52.70% | 33,126 | $38.64 |
| Q4 2020 | +5,745 | Add 8.94% | 70,041 | $35.95 |
| Q3 2020 | +64,296 | New Buy | 64,296 | $38.21 |
| Q1 2019 | -77,730 | Sold Out | 0 | $0.00 |
| Q4 2018 | +77,730 | New Buy | 77,730 | $35.34 |
| Q2 2018 | -71,740 | Sold Out | 0 | $0.00 |
| Q1 2018 | +71,740 | New Buy | 71,740 | $27.32 |
Lee Ainslie's Boston Scientific Corporation Investment FAQs
Lee Ainslie first purchased Boston Scientific Corporation (BSX) in Q1 2018, acquiring 71,740 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Lee Ainslie has held Boston Scientific Corporation (BSX) for 15 quarters since Q1 2018.
Lee Ainslie's largest addition to Boston Scientific Corporation (BSX) was in Q4 2025, adding 2,944,254 shares worth $280.73 M.
According to the latest 13F filing for Q1 2026, Lee Ainslie's firm, Maverick Capital LTD, owns 4,195,089 shares of Boston Scientific Corporation (BSX), valued at approximately $263.24 M.
As of the Q1 2026 filing, Boston Scientific Corporation (BSX) represents approximately 3.04% of Lee Ainslie's publicly disclosed stock portfolio, making it one of their key holdings.
Lee Ainslie's peak holding in Boston Scientific Corporation (BSX) was 4,195,089 shares, as reported at the end of Q1 2026.