Rock Springs Capital Management LP 13F holdings, Q2 2025
Holdings as of June 30, 2025 · filings on SEC EDGAR · latest filing →
Rock Springs Capital Management LP disclosed 93 US equity positions worth $1.6bn in its Q2 2025 13F filing. The largest position was ARGX at 6.0% of the reported book, followed by LLY and MERUS N V. Against the Q1 2025 filing, it opened 4 new positions, added to 18 and reduced 19 among the top 50 holdings.
What did Rock Springs Capital Management LP own in Q2 2025? Top 50 positions
| # | Stock | Sector | Weight | Value | Shares | Δ shares | vs Q1 2025 |
|---|---|---|---|---|---|---|---|
| 1 | ARGX ARGENX SE | Healthcare | 6.0% | $96.9m | 175,750 | 0% | held |
| 2 | LLY ELI LILLY & CO | Healthcare | 5.7% | $90.8m | 116,500 | 3% | added |
| 3 | MERUS N V | 3.5% | $55.9m | 1,063,608 | 8% | added | |
| 4 | RYTM RHYTHM PHARMACEUTICALS INC | Healthcare | 3.4% | $54.4m | 861,153 | 3% | added |
| 5 | INSM INSMED INC | Healthcare | 3.3% | $52.8m | 525,000 | 2% | added |
| 6 | RARE ULTRAGENYX PHARMACEUTICAL IN | Healthcare | 3.2% | $50.6m | 1,391,072 | -0% | held |
| 7 | RVMD REVOLUTION MEDICINES INC | Healthcare | 3.1% | $49.0m | 1,330,960 | 4% | added |
| 8 | ISRG INTUITIVE SURGICAL INC | Healthcare | 2.8% | $44.6m | 82,000 | -20% | reduced |
| 9 | MDGL MADRIGAL PHARMACEUTICALS INC | Healthcare | 2.6% | $42.5m | 140,296 | -16% | reduced |
| 10 | MIRM MIRUM PHARMACEUTICALS INC | Healthcare | 2.6% | $41.6m | 818,206 | -14% | reduced |
| 11 | BSX BOSTON SCIENTIFIC CORP | Healthcare | 2.4% | $38.1m | 355,000 | 28% | added |
| 12 | ASND ASCENDIS PHARMA A/S | Healthcare | 2.3% | $37.5m | 217,000 | 0% | held |
| 13 | IRTC IRHYTHM TECHNOLOGIES INC | Healthcare | 2.3% | $37.3m | 242,500 | -5% | reduced |
| 14 | AKERO THERAPEUTICS INC | 2.1% | $34.2m | 640,526 | -5% | reduced | |
| 15 | PEN PENUMBRA INC | Healthcare | 2.1% | $33.0m | 128,500 | -25% | reduced |
| 16 | AGIO AGIOS PHARMACEUTICALS INC | Healthcare | 2.1% | $32.9m | 989,745 | 189% | added |
| 17 | ALNY ALNYLAM PHARMACEUTICALS INC | Healthcare | 2.0% | $32.6m | 100,000 | -30% | reduced |
| 18 | EVH EVOLENT HEALTH INC | Healthcare | 2.0% | $31.8m | 2,820,700 | 5% | added |
| 19 | ZLAB ZAI LAB LTD | Healthcare | 1.9% | $30.5m | 871,392 | -4% | reduced |
| 20 | EXK EXACT SCIENCES CORP | Basic Materials | 1.9% | $30.4m | 572,000 | 19% | added |
| 21 | XENE XENON PHARMACEUTICALS INC | Healthcare | 1.8% | $29.2m | 931,681 | 0% | held |
| 22 | TVTX TRAVERE THERAPEUTICS INC | Healthcare | 1.8% | $28.2m | 1,908,208 | -35% | reduced |
| 23 | SRRK SCHOLAR ROCK HLDG CORP | Healthcare | 1.8% | $28.1m | 794,133 | 4% | added |
| 24 | DXCM DEXCOM INC | Healthcare | 1.6% | $25.0m | 286,750 | -28% | reduced |
| 25 | PHR PHREESIA INC | Healthcare | 1.5% | $23.8m | 837,300 | -27% | reduced |
| 26 | 2655787D BLUEPRINT MEDICINES CORP | 1.5% | $23.8m | 185,500 | -82% | reduced | |
| 27 | GPCR STRUCTURE THERAPEUTICS INC | Healthcare | 1.5% | $23.6m | 1,135,879 | 0% | held |
| 28 | THC TENET HEALTHCARE CORP | Healthcare | 1.4% | $22.9m | 130,000 | 0% | held |
| 29 | CAI CARIS LIFE SCIENCES INC | Healthcare | 1.3% | $21.2m | 793,651 | – | new |
| 30 | KYMR KYMERA THERAPEUTICS INC | Healthcare | 1.2% | $19.7m | 450,374 | -43% | reduced |
| 31 | OMDA OMADA HEALTH INC | Healthcare | 1.0% | $16.8m | 919,951 | – | new |
| 32 | CLDX CELLDEX THERAPEUTICS INC NEW | Healthcare | 1.0% | $16.5m | 812,653 | 0% | held |
| 33 | AZTA AZENTA INC | Healthcare | 1.0% | $16.3m | 530,400 | 12% | added |
| 34 | ACHC ACADIA HEALTHCARE COMPANY IN | Healthcare | 1.0% | $15.8m | 696,000 | 2% | added |
| 35 | UNH UNITEDHEALTH GROUP INC | Healthcare | 1.0% | $15.8m | 50,500 | -50% | reduced |
| 36 | TARS TARSUS PHARMACEUTICALS INC | Healthcare | 0.9% | $15.1m | 373,750 | 5% | added |
| 37 | SMMT SUMMIT THERAPEUTICS INC | Healthcare | 0.9% | $15.1m | 710,000 | -29% | reduced |
| 38 | AGL AGILON HEALTH INC | Healthcare | 0.9% | $15.1m | 6,550,400 | -6% | reduced |
| 39 | OSCR OSCAR HEALTH INC | Healthcare | 0.9% | $15.0m | 700,000 | -33% | reduced |
| 40 | VERA VERA THERAPEUTICS INC | Healthcare | 0.9% | $14.5m | 617,396 | 19% | added |
| 41 | ELVN ENLIVEN THERAPEUTICS INC | Healthcare | 0.9% | $14.1m | 701,408 | 51% | added |
| 42 | INSP INSPIRE MED SYS INC | Healthcare | 0.9% | $14.0m | 107,500 | 8% | added |
| 43 | SLNOEUR SOLENO THERAPEUTICS INC | 0.8% | $12.9m | 154,528 | 25% | added | |
| 44 | CMPX COMPASS THERAPEUTICS INC | 0.8% | $12.9m | 4,962,955 | 0% | held | |
| 45 | XBI SPDR SERIES TRUST | 0.8% | $12.6m | 151,750 | – | new | |
| 46 | ACLXGBX ARCELLX INC | 0.8% | $12.3m | 186,314 | – | new | |
| 47 | MREO MEREO BIOPHARMA GROUP PLC | Healthcare | 0.8% | $12.1m | 4,465,292 | -33% | reduced |
| 48 | DHR DANAHER CORPORATION | Healthcare | 0.7% | $11.7m | 59,000 | 0% | held |
| 49 | AM6 AMICUS THERAPEUTICS INC | 0.7% | $11.2m | 1,960,334 | 3% | added | |
| 50 | WST WEST PHARMACEUTICAL SVSC INC | Healthcare | 0.7% | $11.2m | 51,030 | -15% | reduced |
Weights are shares of the reported long US equity book (options excluded). Values are as filed, normalised to whole dollars. Share changes compare against the immediately preceding filing only.