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 Mar 31, 2025
Ownership Breakdown
1,722
Institutional Holders
▲ 131 vs Q4
$135.15B
Total Inst. Value
▲ $15.37B vs Q4
1.49B
Shares Outstanding
freeFloat 99.46%
1.34B
13F Shares Held
▲ 2.13M vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. surgical & medical instruments & apparatus | 141.67M | 9.59% | 9.59% | $14.29T | May 2, 2025 | ▲ 2.64M |
VANGUARD GROUP INC surgical & medical instruments & apparatus | 134.59M | 9.11% | 9.11% | $13.58T | May 9, 2025 | ▲ 1.70M |
FMR LLC surgical & medical instruments & apparatus | 128.60M | 8.71% | 8.71% | $12.97T | May 12, 2025 | ▼ 3.85M |
STATE STREET CORP surgical & medical instruments & apparatus | 64.48M | 4.36% | 4.36% | $6.50T | May 15, 2025 | ▲ 514.8K |
PRIMECAP MANAGEMENT CO/CA/ surgical & medical instruments & apparatus | 36.50M | 2.47% | 2.47% | $3.68T | May 9, 2025 | ▼ 432.7K |
WELLINGTON MANAGEMENT GROUP LLP surgical & medical instruments & apparatus | 33.20M | 2.25% | 2.25% | $3.35T | May 13, 2025 | ▼ 2.97M |
GEODE CAPITAL MANAGEMENT, LLC surgical & medical instruments & apparatus | 31.80M | 2.15% | 2.15% | $3.20T | May 13, 2025 | ▲ 1.18M |
BANK OF AMERICA CORP /DE/ surgical & medical instruments & apparatus | 31.56M | 2.14% | 2.14% | $3.18T | May 15, 2025 | ▲ 4.08M |
JPMORGAN CHASE & CO surgical & medical instruments & apparatus | 31.52M | 2.13% | 2.13% | $3.18T | May 12, 2025 | ▲ 5.28M |
CAPITAL WORLD INVESTORS surgical & medical instruments & apparatus | 28.56M | 1.93% | 1.93% | $2.88T | May 12, 2025 | ▲ 658.8K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
25
Increased
+31.58M shares1
New Positions
first time holders24
Decreased
−37.22M shares0
Sold Out
fully exitedNet shares change (top 50)
5.64M
+31.58M / −37.22M
Net new holders
+2
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 9.21%.
The largest institutional shareholder of Boston Scientific Corporation is BLACKROCK, INC., holding approximately 141.67 million shares — equal to 9.59% of outstanding shares — as of March 31, 2025.
A total of 1,722 institutional investors currently hold BSX stock, with a combined institutional value of approximately $135.15 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 9.59% stake. Company insiders hold 0.54%. Data sourced from SEC Form 13F as of March 31, 2025.