Boston Scientific
1,795 hedge funds and large institutions have $130B invested in Boston Scientific in 2025 Q4 according to their latest regulatory filings, with 239 funds opening new positions, 674 increasing their positions, 686 reducing their positions, and 128 closing their positions.
87% more first-time investments, than exits
New positions opened: 239 | Existing positions closed: 128
13% more call options, than puts
Call options by funds: $987M | Put options by funds: $872M
5% more funds holding
Funds holding: 1,715 → 1,795 (+80)
1.38% more ownership
Funds ownership: 90.7% → 92.08% (+1.4%)
1% less capital invested
Capital invested by funds: $131B → $130B (-$1.09B)
2% less repeat investments, than reductions
Existing positions increased: 674 | Existing positions reduced: 686
3% less funds holding in top 10
Funds holding in top 10: 39 → 38 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
DZ Bank
Frankfurt Am Main,
Germany
|
+$442M |
| 2 |
UBS Group
Zurich,
Switzerland
|
+$422M |
| 3 |
BNP Paribas Asset Management
Paris,
France
|
+$323M |
| 4 |
MC
Maverick Capital
Dallas,
Texas
|
+$289M |
| 5 |
Millennium Management
New York
|
+$269M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
-$901M |
| 2 |
Bank of America
Charlotte,
North Carolina
|
-$858M |
| 3 |
Marshall Wace
London,
United Kingdom
|
-$671M |
| 4 |
Wellington Management Group
Boston,
Massachusetts
|
-$485M |
| 5 |
Citadel Advisors
Miami,
Florida
|
-$405M |
BSX Hedge Fund Activity: Q4 2025 in Review
1,795 of the 8,284 institutional investors tracked by Wall St. Rank reported a position in Boston Scientific (BSX) for Q4 2025, worth a combined $130B — down 0.83% from $131B a quarter earlier.
Buyers outnumbered sellers: 239 funds opened new BSX positions and 128 closed out — a net gain of 111 holders — while 674 added to existing stakes and 686 trimmed.
The largest buyer was DZ Bank, adding an estimated $442M. The largest seller was BlackRock, cutting an estimated $901M.
- 1,795 institutional investors held Boston Scientific (BSX) as of Q4 2025, up from 1,715 in Q3 2025.
- Funds reported $130B of Boston Scientific stock for Q4 2025, down 0.83% quarter-over-quarter.
- 239 funds opened new Boston Scientific positions in Q4 2025 and 128 closed out, a net change of +111 holders.
- The largest Boston Scientific buyer in Q4 2025 was DZ Bank, an estimated $442M added.
- The largest Boston Scientific seller in Q4 2025 was BlackRock, an estimated $901M sold.
Based on aggregated 13F filings for Q4 2025.