| 4 | PRIMECAP MANAGEMENT CO/CA/ | 50.5M | $2.16B | +55.3% | 3.399% | 1.28% |
| 5 | FMR LLC | 45.7M | $1.95B | -38.4% | 3.075% | 0.08% |
| 6 | MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 24.9M | $1.50B | +126.1% | 1.673% | 0.48% |
| 7 | JANE STREET GROUP, LLC | 33.8M | $1.44B | +418.9% | 2.272% | 0.12% |
| 8 | GEODE CAPITAL MANAGEMENT, LLC | 33.4M | $1.42B | +0.5% | 2.250% | 0.08% |
| 9 | VANGUARD PORTFOLIO MANAGEMENT LLC | 29.8M | $1.27B | -0.0% | 2.004% | 0.06% |
| 10 | D. E. Shaw & Co., Inc. | 27.3M | $1.16B | +11.6% | 1.835% | 0.55% |
| 11 | JPMORGAN CHASE & CO | 23.9M | $1.04B | -28.3% | 1.608% | 0.06% |
| 12 | First Nebraska Trust Co | 44K | $1.03B | — | 0.003% | 0.01% |
| 13 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 23.3M | $994.2M | +67.7% | 1.567% | 0.44% |
| 14 | NORGES BANK | 21.2M | $903.5M | — | 1.424% | 0.09% |
| 15 | TWO SIGMA INVESTMENTS, LP | 19.4M | $828.9M | +106.2% | 1.307% | 0.60% |
| 16 | GOLDMAN SACHS GROUP INC | 19.2M | $819.8M | -0.8% | 1.292% | 0.07% |
| 17 | MORGAN STANLEY | 18.9M | $808.7M | -14.9% | 1.275% | 0.04% |
| 18 | Jupiter Topco LLC | 18.8M | $803.4M | — | 1.266% | 0.33% |
| 19 | Capital World Investors | 16.8M | $717.6M | +9.8% | 1.131% | 0.08% |
| 20 | UBS Group AG | 16.7M | $711.5M | +5.4% | 1.122% | 0.09% |
| 21 | WELLINGTON MANAGEMENT GROUP LLP | 15.3M | $653.1M | -18.8% | 1.030% | 0.11% |
| 22 | Amundi | 14.3M | $610.2M | +1.2% | 0.962% | 0.15% |
| 23 | Capital Research Global Investors | 14.2M | $605.3M | +100.3% | 0.954% | 0.08% |
| 24 | FRANKLIN RESOURCES INC | 14.0M | $596.7M | -4.9% | 0.941% | 0.13% |
| 25 | Invesco Ltd. | 13.8M | $589.0M | +52.5% | 0.928% | 0.05% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in BSX — a direct measure of their conviction.
Institutions that fully closed their BSX position in Q2 2026
| 88.50% |
| +0.04 pp |
| $125.64B |
| +11% |
| Q4 2024 | 1,450 | +8.0% | 88.46% | +2.60 pp | $113.22B | +12% |
| Q3 2024 | 1,343 | — | 85.86% | — | $101.00B | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
131 institutions opened new positions in BSX during Q2 2026, while 322 fully exited. 221 added to existing positions and 1,080 trimmed.
BSX institutional ownership rose by 1.04 percentage points quarter-over-quarter, with a net change of -174 holders.
The top 10 institutions account for 40.2% of all reported 13F value in BSX, and the top 25 account for 60.2%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Boston Scientific Corporation (BSX) Institutional Ownership