8 institutions reported holding $303.1M of BOSTON SCIENTIFIC CORP (BSX-PA) in SEC 13F filings for 2026-03-31. Largest institutional holders: IMC-Chicago, LLC ($104.1M), JPMORGAN CHASE & CO ($69.3M), SIMPLEX TRADING, LLC ($64.9M), GROUP ONE TRADING LLC ($44.6M), HRT FINANCIAL LP ($19.3M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | IMC-Chicago, LLC | $104.1M | 1.7M | Added |
| 2 | JPMORGAN CHASE & CO | $69.3M | 1.1M | Added |
| 3 | SIMPLEX TRADING, LLC | $64.9M | 1.0M | Added |
| 4 | GROUP ONE TRADING LLC | $44.6M | 710,300 | Added |
| 5 | HRT FINANCIAL LP | $19.3M | 307,000 | New |
| 6 | SUMMIT SECURITIES GROUP LLC | $960,075 | 15,300 | New |
| 7 | Phoenix Financial Ltd. | $941 | 15,000 | New |
| 8 | Northwest & Ethical Investments L.P. | $0 | 0 | Exited |
Source: SEC Form 13F filings · as of 2026-03-31