Boston Scientific
BSX
1,676 hedge funds and large institutions have $84.2B invested in Boston Scientific in 2026 Q1 according to their latest regulatory filings, with 194 funds opening new positions, 676 increasing their positions, 636 reducing their positions, and 276 closing their positions.
144% more call options, than puts
Call options by funds: $1.56B | Put options by funds: $640M
6% more repeat investments, than reductions
Existing positions increased: 676 | Existing positions reduced: 636
1.8% less ownership
Funds ownership: 92.07% → 90.27% (-1.8%)
6% less funds holding
Funds holding: 1,787 → 1,676 (-111)
30% less first-time investments, than exits
New positions opened: 194 | Existing positions closed: 276
32% less funds holding in top 10
Funds holding in top 10: 37 → 25 (-12)
35% less capital invested
Capital invested by funds: $130B → $84.2B (-$45.8B)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
D.E. Shaw & Co
New York
|
+$1.05B |
| 2 |
Wellington Management Group
Boston,
Massachusetts
|
+$730M |
| 3 |
Franklin Resources
San Mateo,
California
|
+$706M |
| 4 |
JP Morgan Chase
New York
|
+$638M |
| 5 |
Two Sigma Investments
New York
|
+$555M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Fidelity Investments
Boston,
Massachusetts
|
-$1.85B |
| 2 |
Capital World Investors
Los Angeles,
California
|
-$947M |
| 3 |
Fisher Asset Management
Camas,
Washington
|
-$695M |
| 4 |
Millennium Management
New York
|
-$554M |
| 5 |
ECU
Egerton Capital (UK)
London,
United Kingdom
|
-$513M |
BSX Hedge Fund Activity: Q1 2026 in Review
1,676 of the 8,172 institutional investors tracked by Wall St. Rank reported a position in Boston Scientific (BSX) for Q1 2026, worth a combined $84.2B — down 35% from $130B a quarter earlier.
Sellers outnumbered buyers: 276 funds closed out of BSX and 194 opened new positions — a net loss of 82 holders — while 636 trimmed existing stakes and 676 added.
The largest buyer was D.E. Shaw & Co, adding an estimated $1.05B. The largest seller was Fidelity Investments, cutting an estimated $1.85B.
- 1,676 institutional investors held Boston Scientific (BSX) as of Q1 2026, down from 1,787 in Q4 2025.
- Funds reported $84.2B of Boston Scientific stock for Q1 2026, down 35% quarter-over-quarter.
- 194 funds opened new Boston Scientific positions in Q1 2026 and 276 closed out, a net change of -82 holders.
- The largest Boston Scientific buyer in Q1 2026 was D.E. Shaw & Co, an estimated $1.05B added.
- The largest Boston Scientific seller in Q1 2026 was Fidelity Investments, an estimated $1.85B sold.
Based on aggregated 13F filings for Q1 2026.