Rock Springs Capital Management LP
Position in NAMS — NewAmsterdam Pharma Co N.V.
CIK 1595725
Baltimore, MD
Position in NAMS
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$19,749,194
+$901,899 QoQ
Shares Held
582,744
-1.0% QoQ
Ownership
0.488%
of shares outstanding
% of Portfolio
0.96%
of 13F equity value
Holder Rank
#35
of 198 holders
Holding Since
Sep 2024
8 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in NAMS Over Time
Shares Held
Position Value (USD)
Derivatives in NAMS
reported options exposure · as of Dec 31, 2025CallValue
$1,108,528
CallShares
31,600
PutValue
$0
PutShares
0
Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.
Position in Biotechnology
Healthcare · as of Jun 30, 2026Rock Springs Capital Management LP holds $1,502,002,537 across 70 Biotechnology names. NAMS ranks #25 (1.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | RVMD |
Revolution Medicines, Inc.
|
1,105,210 | $206,983,728 | |
| 2 | TVTX |
Travere Therapeutics, Inc.
|
2,179,069 | $123,792,909 | |
| 3 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
174,999 | $93,965,713 | |
| 4 | MIRM |
Mirum Pharmaceuticals, Inc.
|
798,145 | $93,438,835 | |
| 5 | RYTM |
Rhythm Pharmaceuticals, Inc.
|
692,598 | $76,899,155 | |
| 6 | KYMR |
Kymera Therapeutics, Inc.
|
453,156 | $51,963,398 | |
| 7 | ARGX |
Argenx SE
|
52,750 | $48,939,867 | |
| 8 | ASND |
Ascendis Pharma A/S
|
168,750 | $45,009,000 |
All Filings in NAMS
Export CSV
10 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $19,749,194 | 582,744 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $18,847,295 | 588,794 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $19,546,365 | 557,194 | Shares | Sole | 2026-02-17 | |
| 2025-12-31 | $1,108,528 | 31,600 | Call | Sole | 2026-02-17 | |
| 2025-09-30 | $16,948,220 | 595,929 | Shares | Sole | 2025-11-14 | |
| 2025-09-30 | $898,704 | 31,600 | Call | Sole | 2025-11-14 | |
| 2025-06-30 | $9,708,970 | 536,111 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $10,974,192 | 536,111 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $19,725,315 | 767,522 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $5,865,095 | 353,319 | Shares | Sole | 2024-11-14 | |
| No filing history on record for this holder in this stock. | ||||||