Rock Springs Capital Management LP
Position in BSX — Boston Scientific Corp
CIK 1595725
Baltimore, MD
Position in BSX
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$32,335,075
-$5,714,342 QoQ
Shares Held
515,300
+29.1% QoQ
Ownership
0.035%
of shares outstanding
% of Portfolio
1.91%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
18 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in BSX Over Time
Shares Held
Position Value (USD)
Position in Medical Devices
Healthcare · as of Mar 31, 2026Rock Springs Capital Management LP holds $142,910,763 across 8 Medical Devices names. BSX ranks #2 (22.6% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | PEN |
Penumbra Inc
|
120,500 | $39,568,585 | |
| 2 | BSX |
Boston Scientific Corp
This page
|
515,300 | $32,335,075 | |
| 3 | IRTC |
iRhythm Holdings, Inc.
|
261,750 | $30,891,735 | |
| 4 | DXCM |
Dexcom Inc
|
355,600 | $22,331,680 | |
| 5 | INSP |
Inspire Medical Systems, Inc.
|
131,800 | $6,798,244 | |
| 6 | SYK |
Stryker Corp
|
14,800 | $4,863,132 | |
| 7 | ATEC |
Alphatec Holdings, Inc.
|
350,000 | $3,808,000 | |
| 8 | EW |
Edwards Lifesciences Corp
|
28,900 | $2,314,312 |
All Filings in BSX
Export CSV
18 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $32,335,075 | 515,300 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $38,049,417 | 399,050 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $35,171,207 | 360,250 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $38,130,550 | 355,000 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $27,943,760 | 277,000 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $41,087,200 | 460,000 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $38,548,000 | 460,000 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $62,955,675 | 817,500 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $84,413,925 | 1,232,500 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $71,250,825 | 1,232,500 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $61,248,000 | 1,160,000 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $14,469,075 | 267,500 | Shares | Sole | 2023-08-14 | |
| 2021-06-30 | $34,208,000 | 800,000 | Shares | Sole | 2021-08-16 | |
| 2021-03-31 | $30,920,000 | 800,000 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $28,760,000 | 800,000 | Shares | Sole | 2021-02-16 | |
| 2020-09-30 | $42,031,000 | 1,100,000 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $38,621,000 | 1,100,000 | Shares | Sole | 2020-08-14 | |
| 2020-03-31 | $35,893,000 | 1,100,000 | Shares | Sole | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||