Boston Scientific Corporation
Boston Scientific Corporation (BSX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · BSX · as of Sep 30, 2025
Ownership Breakdown
1,786
Institutional Holders
▲ 12 vs Q2
$131.91B
Total Inst. Value
▼ $13.25B vs Q2
1.49B
Shares Outstanding
freeFloat 99.46%
1.34B
13F Shares Held
▼ 10.97M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
BSX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. surgical & medical instruments & apparatus | 145.18M | 9.82% | 9.82% | $14.17T | Nov 12, 2025 | ▼ 1.51M |
VANGUARD GROUP INC surgical & medical instruments & apparatus | 138.25M | 9.35% | 9.35% | $13.50T | Nov 7, 2025 | ▲ 1.12M |
FMR LLC surgical & medical instruments & apparatus | 99.48M | 6.73% | 6.73% | $9.71T | Nov 13, 2025 | ▼ 8.83M |
STATE STREET CORP surgical & medical instruments & apparatus | 64.93M | 4.39% | 4.39% | $6.34T | Nov 14, 2025 | ▼ 266.3K |
BANK OF AMERICA CORP /DE/ surgical & medical instruments & apparatus | 33.87M | 2.29% | 2.29% | $3.31T | Feb 3, 2026 | ▲ 23.9K |
PRIMECAP MANAGEMENT CO/CA/ surgical & medical instruments & apparatus | 33.10M | 2.24% | 2.24% | $3.23T | Nov 12, 2025 | ▼ 1.56M |
GEODE CAPITAL MANAGEMENT, LLC surgical & medical instruments & apparatus | 32.69M | 2.21% | 2.21% | $3.18T | Nov 12, 2025 | ▲ 265.5K |
JPMORGAN CHASE & CO surgical & medical instruments & apparatus | 28.33M | 1.92% | 1.92% | $2.77T | Nov 26, 2025 | ▲ 2.67M |
CAPITAL WORLD INVESTORS surgical & medical instruments & apparatus | 26.65M | 1.80% | 1.80% | $2.60T | Nov 13, 2025 | ▼ 1.88M |
MORGAN STANLEY surgical & medical instruments & apparatus | 20.71M | 1.40% | 1.40% | $2.02T | May 27, 2026 | ▲ 450.6K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
31
Increased
+43.74M shares1
New Positions
first time holders18
Decreased
−50.50M shares0
Sold Out
fully exitedNet shares change (top 50)
6.76M
+43.74M / −50.50M
Net new holders
+14
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
BSX insider trading · insider activity
Source: SEC Form 4
Insiders have been net buyers of shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
20
Buy transactions
4
Sell transactions
5.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Mahoney Michael F Chairman, President & CEO | May 28, 2026 | Gift | 386,755 | — | — | 0 | Form 4 ↗ |
Pegus Cheryl director | May 20, 2026 | Purchase | 1,770 | $56.49 | $100.0K | 1.8K | Form 4 ↗ |
LUDWIG EDWARD J director | May 20, 2026 | Purchase | 3,580 | $56.68 | $202.9K | 25.4K | Form 4 ↗ |
Habiger David C director | May 20, 2026 | Purchase | 2,250 | $55.92 | $125.8K | 13.9K | Form 4 ↗ |
Habiger David C director | May 19, 2026 | Purchase | 2,200 | $56.95 | $125.3K | 11.6K | Form 4 ↗ |
Zane Ellen M director | May 7, 2026 | Award | 3,800 | — | — | 27.9K | Form 4 ↗ |
WICHMANN DAVID S director | May 7, 2026 | Award | 3,800 | — | — | 45.4K | Form 4 ↗ |
Weber Christophe Pierre director | May 7, 2026 | Award | 1,140 | — | — | 3.8K | Form 4 ↗ |
Weber Christophe Pierre director | May 7, 2026 | Award | 2,660 | — | — | 2.7K | Form 4 ↗ |
Weber Christophe Pierre director | May 7, 2026 | Award | 1,767 | — | — | 2.6K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Boston Scientific Corporation (BSX) is primarily owned by institutional investors, who hold approximately 90.3% of total shares outstanding. Company insiders own approximately 0.54%, while retail and public investors account for the remaining 9.19%.
The largest institutional shareholder of Boston Scientific Corporation is BLACKROCK, INC., holding approximately 145.18 million shares — equal to 9.82% of outstanding shares — as of September 30, 2025.
A total of 1,786 institutional investors currently hold BSX stock, with a combined institutional value of approximately $131.91 billion as of the most recent 13F filing period.
Frequently asked questions
BSX ownershipBoston Scientific Corporation (BSX) is primarily owned by institutional investors, who hold approximately 90.3% of shares. The largest shareholder is BLACKROCK, INC. with a 9.82% stake. Company insiders hold 0.54%. Data sourced from SEC Form 13F as of September 30, 2025.