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Rock Springs Capital Management LP

CIK 0001595725

Annualised vol
12.184995%
Beta
0.319437
HHI
305.389227
Top-10 weight
43.960044%
VaR 95%
1.095354%
VaR 99%
2.213998%
Max drawdown
22.992423%
Matched value
91.230476%

Returns of reported holdings

Loading returns…

Position changes vs prior quarter

What the latest 13F shows bought and sold against the quarter before, by share count.

TickerChangeShares nowShares beforeShare change %Value now ($)
RVMD REDUCED 1,105,210 1,209,465 -8.62% 206,983,729
TVTX ADDED 2,179,069 1,477,954 47.44% 123,792,910
LLY UNCHANGED 98,700 98,700 0.0% 118,383,741
MDGL ADDED 174,999 170,999 2.34% 93,965,713
MIRM REDUCED 798,145 811,294 -1.62% 93,438,835
RYTM ADDED 692,598 689,748 0.41% 76,899,156
KYMR REDUCED 453,156 496,871 -8.8% 51,963,399
ARGX REDUCED 52,750 98,500 -46.45% 48,939,868
ASND REDUCED 168,750 194,000 -13.02% 45,009,000
XENE REDUCED 683,907 763,020 -10.37% 41,280,627
INSM ADDED 362,150 314,300 15.22% 38,612,433
PEN REDUCED 115,750 120,500 -3.94% 36,548,063
GPCR ADDED 640,317 640,217 0.02% 34,365,813
IRTC ADDED 269,650 261,750 3.02% 32,074,868
ISRG REDUCED 76,460 82,000 -6.76% 30,406,613
AGL ADDED 262,600 260,000 1.0% 28,145,468
UNH ADDED 63,750 53,000 20.28% 26,496,413
CLDX ADDED 699,146 650,270 7.52% 26,015,223
ERAS ADDED 1,402,150 1,103,469 27.07% 25,687,388
NBIX REDUCED 144,750 150,450 -3.79% 24,395,441
ELVN REDUCED 464,625 826,500 -43.78% 23,579,719
THC UNCHANGED 125,000 125,000 0.0% 23,385,000
DXCM REDUCED 343,000 355,600 -3.54% 23,101,050
ACRS REDUCED 4,330,532 4,472,650 -3.18% 22,908,514
MMED ADDED 1,520,000 1,055,000 44.08% 22,724,000
BSX ADDED 528,500 515,300 2.56% 22,556,380
PHVS ADDED 648,333 645,533 0.43% 22,419,355
DYN REDUCED 942,154 972,198 -3.09% 20,925,240
ALNY REDUCED 66,750 74,000 -9.8% 20,093,753
COGT REDUCED 515,917 624,155 -17.34% 19,965,988
AGIO REDUCED 532,563 799,163 -33.36% 19,763,413
VERA REDUCED 427,584 503,585 -15.09% 18,347,629
TARS ADDED 277,087 225,179 23.05% 17,439,856
HTFL ADDED 573,500 572,500 0.17% 16,826,490
MBX ADDED 298,218 287,967 3.56% 16,461,634
CYTK ADDED 187,980 45,364 314.38% 16,014,016
BCAX ADDED 535,286 489,095 9.44% 15,892,641
PBLS NEW 578,028 - - 15,820,626
ZLAB UNCHANGED 814,707 814,707 0.0% 15,479,433
TNGX ADDED 456,551 386,915 18.0% 14,271,784
EVH REDUCED 2,500,000 2,675,000 -6.54% 13,550,000
PTCT ADDED 162,298 161,798 0.31% 13,238,648
MLYS ADDED 484,951 439,751 10.28% 13,083,978
ZBIO UNCHANGED 502,077 502,077 0.0% 12,742,714
ARDX REDUCED 2,241,769 2,299,473 -2.51% 11,433,022
BBIO ADDED 144,750 128,250 12.87% 10,780,980
ALKS ADDED 199,811 183,986 8.6% 10,469,097
SMMT ADDED 715,000 710,000 0.7% 10,417,550
AZTA REDUCED 403,000 569,100 -29.19% 10,284,560
INDV ADDED 245,500 200,000 22.75% 10,072,865
SYK ADDED 29,000 14,800 95.95% 9,130,360
AMLX UNCHANGED 499,764 499,764 0.0% 8,975,761
CAI REDUCED 487,500 563,000 -13.41% 8,687,250
OMDA REDUCED 373,000 541,000 -31.05% 8,187,350
CMPX ADDED 3,524,929 3,305,308 6.64% 7,719,595
IMNM UNCHANGED 347,666 347,666 0.0% 7,367,043
PHR ADDED 696,900 600,400 16.07% 7,171,101
OMER NEW 718,499 - - 6,832,925
DFTX NEW 143,187 - - 6,735,516
CORT ADDED 72,000 50,250 43.28% 6,260,400
JANX UNCHANGED 367,009 367,009 0.0% 5,637,258
RCUS UNCHANGED 180,000 180,000 0.0% 5,549,400
TMO UNCHANGED 10,000 10,000 0.0% 5,013,600
TRVI NEW 260,000 - - 4,849,000
SION UNCHANGED 99,429 99,429 0.0% 4,373,882
CVS UNCHANGED 40,000 40,000 0.0% 4,138,000
EYPT ADDED 268,519 258,739 3.78% 3,839,822
OCUL UNCHANGED 383,716 383,716 0.0% 3,768,091
SYRE NEW 42,254 - - 3,751,310
TLPH UNCHANGED 3,589,186 3,589,186 0.0% 3,696,862
ROIV ADDED 101,000 97,000 4.12% 3,574,390
PCVX UNCHANGED 60,250 60,250 0.0% 3,502,333
NGNE ADDED 106,750 104,339 2.31% 3,357,288
IPSC UNCHANGED 1,304,347 1,304,347 0.0% 3,195,650
NVO REDUCED 63,500 90,000 -29.44% 3,044,190
OLMA ADDED 235,178 170,378 38.03% 2,942,077
NGEN NEW 1,208,231 - - 2,488,956
MDT NEW 30,900 - - 2,417,307
SGMT NEW 250,000 - - 1,932,500
CAPR NEW 74,448 - - 1,792,708
LENZ UNCHANGED 257,460 257,460 0.0% 1,462,373
ALT NEW 471,465 - - 1,433,254
KLRA NEW 65,000 - - 1,431,950
SGRY REDUCED 84,000 208,000 -59.62% 1,411,200
AXSM NEW 5,500 - - 1,346,235
ORKA ADDED 12,051 4,123 192.29% 1,146,894
VKTX REDUCED 25,500 96,000 -73.44% 994,755
LEGN REDUCED 33,500 40,500 -17.28% 967,480
GKOS NEW 4,750 - - 663,860
JSPR UNCHANGED 1,100,726 1,100,726 0.0% 463,406
BCRX ADDED 22,124 12,600 75.59% 221,240
MLTX REDUCED 10,696 61,700 -82.66% 208,251
GOSS CLOSED OUT 0 1,609,492 -100.0% 0
EW CLOSED OUT 0 28,900 -100.0% 0
REGN CLOSED OUT 0 10,100 -100.0% 0
JAZZ CLOSED OUT 0 5,750 -100.0% 0

Holdings (latest quarter)

TickerChangeIssuerClassCUSIPValue ($)Weight %Shares
RVMD REDUCED REVOLUTION MEDICINES INC COM 76155X100 206,983,729 10.1 1105210.0
TVTX ADDED TRAVERE THERAPEUTICS INC COM 89422G107 123,792,910 6.04 2179069.0
LLY UNCHANGED ELI LILLY & CO COM 532457108 118,383,741 5.78 98700.0
MDGL ADDED MADRIGAL PHARMACEUTICALS INC COM 558868105 93,965,713 4.59 174999.0
MIRM REDUCED MIRUM PHARMACEUTICALS INC COM 604749101 93,438,835 4.56 798145.0
RYTM ADDED RHYTHM PHARMACEUTICALS INC COM 76243J105 76,899,156 3.75 692598.0
KYMR REDUCED KYMERA THERAPEUTICS INC COM 501575104 51,963,399 2.54 453156.0
ARGX REDUCED ARGENX SE SPONSORED ADR 04016X101 48,939,868 2.39 52750.0
ASND REDUCED ASCENDIS PHARMA A/S ORD SHS K08588103 45,009,000 2.2 168750.0
XENE REDUCED XENON PHARMACEUTICALS INC COM 98420N105 41,280,627 2.01 683907.0
- SCHOLAR ROCK HLDG CORP COM 80706P103 39,349,860 1.92 715452.0
INSM ADDED INSMED INC COM PAR $.01 457669307 38,612,433 1.88 362150.0
PEN REDUCED PENUMBRA INC COM 70975L107 36,548,063 1.78 115750.0
GPCR ADDED STRUCTURE THERAPEUTICS INC SPONSORED ADS 86366E106 34,365,813 1.68 640317.0
- ULTRAGENYX PHARMACEUTICAL IN COM 90400D108 32,316,678 1.58 967855.0
IRTC ADDED IRHYTHM HOLDINGS INC COM 450056106 32,074,868 1.57 269650.0
ISRG REDUCED INTUITIVE SURGICAL INC COM NEW 46120E602 30,406,613 1.48 76460.0
AGL ADDED AGILON HEALTH INC COM NEW 00857U206 28,145,468 1.37 262600.0
UNH ADDED UNITEDHEALTH GROUP INC COM 91324P102 26,496,413 1.29 63750.0
CLDX ADDED CELLDEX THERAPEUTICS INC NEW COM NEW 15117B202 26,015,223 1.27 699146.0
ERAS ADDED ERASCA INC COM 29479A108 25,687,388 1.25 1402150.0
NBIX REDUCED NEUROCRINE BIOSCIENCES INC COM 64125C109 24,395,441 1.19 144750.0
ELVN REDUCED ENLIVEN THERAPEUTICS INC COM 29337E102 23,579,719 1.15 464625.0
THC UNCHANGED TENET HEALTHCARE CORP COM NEW 88033G407 23,385,000 1.14 125000.0
DXCM REDUCED DEXCOM INC COM 252131107 23,101,050 1.13 343000.0
ACRS REDUCED ACLARIS THERAPEUTICS INC COM 00461U105 22,908,514 1.12 4330532.0
MMED ADDED MINIMED GROUP INC COM 60365F109 22,724,000 1.11 1520000.0
BSX ADDED BOSTON SCIENTIFIC CORP COM 101137107 22,556,380 1.1 528500.0
PHVS ADDED PHARVARIS N V COM N69605108 22,419,355 1.09 648333.0
- AVALYN PHARMACEUTICALS INC COM SHS 05348Y105 21,823,261 1.07 662918.0
- HEMAB THERAPEUTICS HLDGS INC COM SHS 423494103 21,135,617 1.03 575432.0
DYN REDUCED DYNE THERAPEUTICS INC COM 26818M108 20,925,240 1.02 942154.0
ALNY REDUCED ALNYLAM PHARMACEUTICALS INC COM 02043Q107 20,093,753 0.98 66750.0
COGT REDUCED COGENT BIOSCIENCES INC COM 19240Q201 19,965,988 0.97 515917.0
AGIO REDUCED AGIOS PHARMACEUTICALS INC COM 00847X104 19,763,413 0.96 532563.0
- NEWAMSTERDAM PHARMA COMPANY ORDINARY SHARES N62509109 19,749,194 0.96 582744.0
VERA REDUCED VERA THERAPEUTICS INC CL A 92337R101 18,347,629 0.9 427584.0
TARS ADDED TARSUS PHARMACEUTICALS INC COM 87650L103 17,439,856 0.85 277087.0
HTFL ADDED HEARTFLOW INC COM 42238D107 16,826,490 0.82 573500.0
MBX ADDED MBX BIOSCIENCES INC COM 55287L101 16,461,634 0.8 298218.0
CYTK ADDED CYTOKINETICS INC COM NEW 23282W605 16,014,016 0.78 187980.0
BCAX ADDED BICARA THERAPEUTICS INC COM 055477103 15,892,641 0.78 535286.0
PBLS NEW PARABILIS MEDICINES INC COM 698955101 15,820,626 0.77 578028.0
ZLAB UNCHANGED ZAI LAB LTD ADR 98887Q104 15,479,433 0.76 814707.0
- DANAHER CORP DEL COM 235851102 14,533,624 0.71 76300.0
TNGX ADDED TANGO THERAPEUTICS INC COM 87583X109 14,271,784 0.7 456551.0
EVH REDUCED EVOLENT HEALTH INC CL A 30050B101 13,550,000 0.66 2500000.0
PTCT ADDED PTC THERAPEUTICS INC COM 69366J200 13,238,648 0.65 162298.0
MLYS ADDED MINERALYS THERAPEUTICS INC COM 603170101 13,083,978 0.64 484951.0
ZBIO UNCHANGED ZENAS BIOPHARMA INC COM 98937L105 12,742,714 0.62 502077.0
ARDX REDUCED ARDELYX INC COM 039697107 11,433,022 0.56 2241769.0
- INSPIRE MED SYS INC COM 457730109 10,884,840 0.53 244000.0
BBIO ADDED BRIDGEBIO PHARMA INC COM 10806X102 10,780,980 0.53 144750.0
ALKS ADDED ALKERMES PLC SHS G01767105 10,469,097 0.51 199811.0
SMMT ADDED SUMMIT THERAPEUTICS INC COM 86627T108 10,417,550 0.51 715000.0
AZTA REDUCED AZENTA INC COM 114340102 10,284,560 0.5 403000.0
INDV ADDED INDIVIOR PHARMACEUTICALS INC COM 45579U109 10,072,865 0.49 245500.0
SYK ADDED STRYKER CORPORATION COM 863667101 9,130,360 0.45 29000.0
AMLX UNCHANGED AMYLYX PHARMACEUTICALS INC COM 03237H101 8,975,761 0.44 499764.0
CAI REDUCED CARIS LIFE SCIENCES INC COM 142152107 8,687,250 0.42 487500.0
OMDA REDUCED OMADA HEALTH INC COM 68170A108 8,187,350 0.4 373000.0
CMPX ADDED COMPASS THERAPEUTICS INC COM 20454B104 7,719,595 0.38 3524929.0
IMNM UNCHANGED IMMUNOME INC COM 45257U108 7,367,043 0.36 347666.0
- EDAP TMS S A SPONSORED ADR 268311107 7,179,480 0.35 1386000.0
PHR ADDED PHREESIA INC COM 71944F106 7,171,101 0.35 696900.0
OMER NEW OMEROS CORP COM 682143102 6,832,925 0.33 718499.0
DFTX NEW DEFINIUM THERAPEUTICS INC COM SHS 24477V105 6,735,516 0.33 143187.0
CORT ADDED CORCEPT THERAPEUTICS INC COM 218352102 6,260,400 0.31 72000.0
JANX UNCHANGED JANUX THERAPEUTICS INC COM 47103J105 5,637,258 0.28 367009.0
- MOBIA MED INC COMMON STOCK 60705V103 5,603,880 0.27 418200.0
RCUS UNCHANGED ARCUS BIOSCIENCES INC COM 03969F109 5,549,400 0.27 180000.0
TMO UNCHANGED THERMO FISHER SCIENTIFIC INC COM 883556102 5,013,600 0.24 10000.0
TRVI NEW TREVI THERAPEUTICS INC COM 89532M101 4,849,000 0.24 260000.0
SION UNCHANGED SIONNA THERAPEUTICS INC COM 829401108 4,373,882 0.21 99429.0
CVS UNCHANGED CVS HEALTH CORP COM 126650100 4,138,000 0.2 40000.0
EYPT ADDED EYEPOINT INC COM NEW 30233G209 3,839,822 0.19 268519.0
OCUL UNCHANGED OCULAR THERAPEUTIX INC COM 67576A100 3,768,091 0.18 383716.0
SYRE NEW SPYRE THERAPEUTICS INC COM NEW 00773J202 3,751,310 0.18 42254.0
TLPH UNCHANGED TALPHERA INC COM NEW 00444T209 3,696,862 0.18 3589186.0
ROIV ADDED ROIVANT SCIENCES LTD SHS G76279101 3,574,390 0.17 101000.0
PCVX UNCHANGED VAXCYTE INC COM 92243G108 3,502,333 0.17 60250.0
NGNE ADDED NEUROGENE INC COM 64135M105 3,357,288 0.16 106750.0
IPSC UNCHANGED CENTURY THERAPEUTICS INC COM 15673T100 3,195,650 0.16 1304347.0
- ALPHATEC HLDGS INC COM NEW 02081G201 3,114,000 0.15 360000.0
NVO REDUCED NOVO-NORDISK A S ADR 670100205 3,044,190 0.15 63500.0
OLMA ADDED OLEMA PHARMACEUTICALS INC COM 68062P106 2,942,077 0.14 235178.0
NGEN NEW NERVGEN PHARMA CORP COM 64082X203 2,488,956 0.12 1208231.0
MDT NEW MEDTRONIC PLC SHS G5960L103 2,417,307 0.12 30900.0
- TEVA PHARMACEUTICAL INDS LTD SPONSORED ADS 881624209 1,998,920 0.1 59000.0
- DIANTHUS THERAPEUTICS INC COM 252828108 1,981,378 0.1 20326.0
SGMT NEW SAGIMET BIOSCIENCES INC COM SER A 786700104 1,932,500 0.09 250000.0
CAPR NEW CAPRICOR THERAPEUTICS INC COM NEW 14070B309 1,792,708 0.09 74448.0
LENZ UNCHANGED LENZ THERAPEUTICS INC COM 52635N103 1,462,373 0.07 257460.0
ALT NEW ALTIMMUNE INC COM NEW 02155H200 1,433,254 0.07 471465.0
KLRA NEW KAILERA THERAPEUTICS INC COMMON STOCK 482931102 1,431,950 0.07 65000.0
SGRY REDUCED SURGERY PARTNERS INC COM 86881A100 1,411,200 0.07 84000.0
AXSM NEW AXSOME THERAPEUTICS INC. COM 05464T104 1,346,235 0.07 5500.0
ORKA ADDED ORUKA THERAPEUTICS INC COM 687604108 1,146,894 0.06 12051.0
VKTX REDUCED VIKING THERAPEUTICS INC COM 92686J106 994,755 0.05 25500.0
LEGN REDUCED LEGEND BIOTECH CORP SPONSORED ADS 52490G102 967,480 0.05 33500.0
GKOS NEW GLAUKOS CORP COM 377322102 663,860 0.03 4750.0
JSPR UNCHANGED JASPER THERAPEUTICS INC COM NEW 471871202 463,406 0.02 1100726.0
BCRX ADDED BIOCRYST PHARMACEUTICALS INC COM 09058V103 221,240 0.01 22124.0
MLTX REDUCED MOONLAKE IMMUNOTHERAPEUTICS CLASS A ORD 61559X104 208,251 0.01 10696.0

Quarterly portfolios

PeriodFiledValue ($)PositionsVol %BetaMax DD %
2026-06-30 2026-08-14 2,048,808,191 104 12.184995 0.319437 22.992423
2026-03-31 2026-05-15 1,696,654,121 100 11.658935 0.331181 21.143528
2025-12-31 2026-02-17 1,950,203,715 99 10.357414 0.298684 18.550224
2025-09-30 2025-11-14 1,711,523,566 93 9.393106 0.273288 15.454186
2025-03-31 2025-05-15 1,747,790,415 96 8.96716 0.29471 12.817389
2024-12-31 2025-02-14 2,626,669,578 107 9.486391 0.329302 14.810068