Loading...
Loading...
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: +4.8pt. 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 $34.58B across 479,108,048 shares. The largest holder is VANGUARD GROUP INC with a position worth $13.32B (0.19% of their portfolio). Grantham, Mayo, Van Otterloo & Co. LLC opened a new position in the most recent quarter. 10 funds increased their holdings. 9 funds reduced their position.
Total Institutional Value
$34.58B
Total Shares Held
479,108,048
Institutional Holders
20
% of Shares Outstanding
32.2%
of 1.49B shares · SEC 2026-04-29
Days to Cover
1.2-6.1%
27.94M shares short · FINRA 2026-06-30
Tracked 13F institutions hold 32.2% 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 2026-04-29), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $13.32B | 0.19% | +1.0% |
| 2 | BlackRock, Inc. | $8.27B | 0.15% | -3.1% |
| 3 | FMR LLC | $4.66B | 0.25% | -23.8% |
| 4 | STATE STREET CORP | $4.27B | 0.15% | +3.3% |
| 5 | WELLINGTON MANAGEMENT GROUP LLP | $1.18B | 0.22% | +94.0% |
| 6 | PRICE T ROWE ASSOCIATES INC /MD/ | $494.05M | 0.06% | +5.6% |
| 7 | Capital Research Global Investors | $444.33M | 0.07% | -0.0% |
| 8 | AQR CAPITAL MANAGEMENT LLC | $327.28M | 0.15% | +377.3% |
| 9 | MILLENNIUM MANAGEMENT LLC | $303.47M | 0.13% | -57.6% |
| 10 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $290.74M | 0.45% | +122.5% |
| Member | Type | Date |
|---|---|---|
| Gilbert Cisneros | Buy | Jun 5, 2026 |
| Gilbert Cisneros | Sell | 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 $34.58B.
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 $34.58B 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
$44.25
2026-07-24
YTD
-53.3%
2% of 52-week range
