Ranked by reported Q2 2026 13F market value
Share of total reported institutional value in BSX held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 129.7M | $5.53B | -1.6% | 8.725% | 0.08% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 97.1M | $4.14B | +0.7% | 6.532% | 0.09% |
| 3 | STATE STREET CORP | 70.1M | $2.99B | +3.1% | 4.717% | 0.04% |
| 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.
Filings activity in BSX during Q2 2026, grouped by how each filer changed its position.
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 1,487 | 10% | 93.20% | +1.04 pp | $58.63B | 29% |
| Q1 2026 | 1,661 | 5.1% | 92.16% | 0.16 pp | $82.93B | 34% |
| Q4 2025 | 1,750 | +4.9% | 92.32% | +1.54 pp | $125.20B | 0.6% |
| Q3 2025 | 1,669 | +1.0% | 90.78% | +0.26 pp | $125.99B | 7.4% |
| Q2 2025 | 1,653 | +3.8% | 90.52% | +2.02 pp | $136.12B | +8.3% |
| Q1 2025 | 1,593 | +9.9% | 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.
Latest Form 4 transactions by company officers and directors. Insider buys are widely viewed as a key fundamental indicator because executives are risking personal capital.
| Date | Insider | Action | Shares | Price | Value |
|---|---|---|---|---|---|
| May 20, 2026 | Pegus Cheryl | Buy | 2K | $56.49 | $100K |
| May 20, 2026 | LUDWIG EDWARD J | Buy | 4K | $56.68 | $203K |
| May 19, 2026 | Habiger David C | Buy | 2K | $56.95 | $125K |
Quick answers to the most common questions about buying BSX stock.
Based on Q2 2026 13F filings, institutional ownership of Boston Scientific Corporation stands at 93.2%, held across 1,487 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of BSX, with approximately 129,680,916 shares worth $5.53B as of Q2 2026.
Yes — 2 widely-followed marquee investors appear among the top 25 institutional holders of BSX, including JANE STREET GROUP, LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for BSX is 47 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
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