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Smart Money Score
Composite context from Form 4, 13F and congressional disclosures; not a forecast.
Of the 20 tracked institutions holding BSX, 13 have a 3-year clone track record — 11 of them beat the S&P. Average holder's clone alpha: +4.4pt. It's a gauge of who owns the name, not just how many.
Among the 20 tracked institutional investors we monitor, BSX (BOSTON SCIENTIFIC CORP) is held with a combined value of $27.30B across 459,961,384 shares. The largest holder is VANGUARD GROUP INC with a position worth $13.32B (0.19% of their portfolio). ARMISTICE CAPITAL, LLC opened a new position in the most recent quarter. 10 funds increased their holdings. 9 funds reduced their position.
Total Institutional Value
$27.30B
Total Shares Held
459,961,384
Institutional Holders
20
% of Shares Outstanding
31.7%
of 1.45B shares · SEC 2026-07-30
Days to Cover
1.6+24.0%
27.62M shares short · FINRA 2026-08-14
Tracked 13F institutions hold 31.7% of BSX's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-07-30), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
6
$9.49M
0
$0
Total Transactions
6
Last 12 months
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Aug 25, 2026 | Susan E Morano | P | Purchase | 2,040 | $100.41K |
| Aug 5, 2026 | David C Habiger | P | Purchase | 2,100 | $99.94K |
| Aug 4, 2026 | David C Habiger | P | Purchase | 140 | $6.80K |
| Aug 3, 2026 | David C Habiger | P | Purchase | 1,042 | $50.08K |
| Aug 3, 2026 | Michael F Mahoney | P | Purchase | 186,240 | $9.00M |
| Jul 31, 2026 | EDWARD J LUDWIG | P | Purchase | 5,000 | $227.40K |
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $13.32B | 0.19% | +1.0% |
| 2 | BlackRock, Inc. | $5.53B | 0.08% | -1.6% |
| 3 | STATE STREET CORP | $2.99B | 0.09% | +3.1% |
| 4 | FMR LLC | $1.95B | 0.08% | -38.4% |
| 5 | WELLINGTON MANAGEMENT GROUP LLP | $653.08M | 0.11% | -18.8% |
| 6 | Capital Research Global Investors | $605.26M | 0.08% | +100.3% |
| 7 | TWO SIGMA ADVISERS, LP | $600.56M | 1.17% | +18.0% |
| 8 | AQR CAPITAL MANAGEMENT LLC | $413.22M | 0.14% | +84.8% |
| 9 | PRICE T ROWE ASSOCIATES INC /MD/ | $301.77M | 0.03% | -10.2% |
| 10 | MAVERICK CAPITAL LTD | $253.41M | 2.29% | +41.5% |
SEC Schedule 13D (activist) and 13G (passive) filings for BSX. Filed when an investor acquires 5%+ ownership.
| Member | Type | Date |
|---|---|---|
| Gilbert Cisneros | Sell | Jun 5, 2026 |
| Gilbert Cisneros | Buy | Jun 5, 2026 |
| John Boozman | Sell | Jun 4, 2026 |
| Gilbert Cisneros | Buy |
As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of BSX with a position worth $13.32B, representing 0.19% of their portfolio. In total, 20 institutional investors hold BSX with a combined value of $27.30B.
In the most recent quarter, 1 fund opened a new position in BSX. Additionally, 10 increased their holdings and 9 reduced their positions.
Institutional investors hold $27.30B worth of BSX stock across 20 positions. The largest institutional holder is VANGUARD GROUP INC with $13.32B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For BSX, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their BSX positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| May 29, 2026 |
| Gilbert Cisneros | Buy | May 19, 2026 |
| Gilbert Cisneros | Buy | May 11, 2026 |
| Alan Armstrong | Buy | Mar 27, 2026 |
| Gilbert Cisneros | Buy | Feb 10, 2026 |
Showing 8 of 33. STOCK Act disclosures lag up to 45 days.
Last Close
$44.96
2026-09-09
YTD
-52.5%
4% of 52-week range
