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Siren, L.L.C.

CIK 0002005245

Annualised vol
13.825837%
Beta
0.215281
HHI
316.530463
Top-10 weight
44.631006%
VaR 95%
1.221163%
VaR 99%
2.813141%
Max drawdown
34.074801%
Matched value
95.766899%

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 ($)
SRRK REDUCED 9,575,013 10,825,013 -11.55% 526,625,715
KYMR REDUCED 2,935,830 3,186,830 -7.88% 336,651,626
ERAS ADDED 11,397,781 11,244,246 1.37% 208,807,348
MANE ADDED 1,655,374 1,505,374 9.96% 203,511,680
TNGX ADDED 6,179,364 5,657,105 9.23% 193,166,919
RVMD REDUCED 900,000 1,110,980 -18.99% 168,552,000
BCAX REDUCED 5,602,970 5,802,970 -3.45% 166,352,179
ARWR ADDED 1,715,476 1,615,476 6.19% 139,828,449
ONC UNCHANGED 465,000 465,000 0.0% 132,511,050
EWTX REDUCED 3,184,629 4,430,263 -28.12% 129,391,476
RYTM ADDED 1,136,275 725,511 56.62% 126,160,613
LXRX UNCHANGED 44,303,518 44,303,518 0.0% 106,328,443
ELVN ADDED 1,774,411 746,226 137.78% 90,051,358
SYRE ADDED 968,598 818,598 18.32% 85,992,130
PBLS NEW 2,992,259 - - 81,898,129
XENE UNCHANGED 1,318,564 1,318,564 0.0% 79,588,523
SLDB UNCHANGED 7,690,405 7,690,405 0.0% 76,827,146
COAG NEW 2,086,834 - - 76,649,413
RCUS REDUCED 2,420,430 3,007,077 -19.51% 74,621,857
COGT ADDED 1,859,279 1,709,279 8.78% 71,954,097
RLAY NEW 3,650,000 - - 68,291,500
TSHA ADDED 9,846,579 8,829,913 11.51% 67,055,203
DFTX ADDED 1,419,493 919,493 54.38% 66,772,951
STOK UNCHANGED 1,995,347 1,995,347 0.0% 65,287,754
IRON REDUCED 888,401 988,401 -10.12% 64,977,649
CYTK ADDED 758,952 613,952 23.62% 64,655,121
SEPN REDUCED 1,900,000 2,000,000 -5.0% 63,631,000
OLMA ADDED 4,856,949 4,756,949 2.1% 60,760,432
KLRA NEW 2,214,286 - - 48,780,721
DYN REDUCED 2,129,125 2,229,125 -4.49% 47,287,866
GPCR REDUCED 872,967 1,328,698 -34.3% 46,852,139
TBLA REDUCED 8,423,410 9,969,495 -15.51% 42,117,050
PVLA UNCHANGED 257,485 257,485 0.0% 39,348,858
SLN ADDED 3,311,438 2,911,438 13.74% 36,359,589
DNLI UNCHANGED 1,396,513 1,396,513 0.0% 35,918,314
RELY UNCHANGED 1,543,271 1,543,271 0.0% 34,584,703
CGEM ADDED 1,893,410 1,193,410 58.66% 34,478,996
TRVI UNCHANGED 1,786,867 1,786,867 0.0% 33,325,070
ORIC UNCHANGED 2,998,192 2,998,192 0.0% 32,470,419
GOOGL ADDED 90,000 65,703 36.98% 32,163,300
ABSI ADDED 2,474,764 1,800,000 37.49% 28,682,515
SION ADDED 610,515 300,000 103.51% 26,856,555
RAPP UNCHANGED 641,469 641,469 0.0% 26,730,013
AMLX ADDED 1,480,586 1,230,000 20.37% 26,591,325
ANNX ADDED 4,458,646 3,958,646 12.63% 25,458,869
MNPR UNCHANGED 270,118 270,118 0.0% 25,010,226
ORKA NEW 250,000 - - 23,792,500
SPTX NEW 1,095,316 - - 23,790,264
DMRA UNCHANGED 900,000 900,000 0.0% 23,409,000
TYRA NEW 725,000 - - 23,156,500
MSFT ADDED 61,500 41,380 48.62% 22,940,730
ZURA UNCHANGED 3,734,866 3,734,866 0.0% 22,035,709
TSM ADDED 44,700 42,200 5.92% 21,347,379
NVDA ADDED 95,000 89,085 6.64% 19,008,550
RZLT UNCHANGED 3,328,287 3,328,287 0.0% 17,307,092
MPLT UNCHANGED 450,000 450,000 0.0% 16,128,000
NMRA UNCHANGED 8,497,822 8,497,822 0.0% 14,446,297
CTMX UNCHANGED 3,457,711 3,457,711 0.0% 12,966,416
GENB UNCHANGED 736,104 736,104 0.0% 12,418,075
IKT UNCHANGED 5,850,000 5,850,000 0.0% 11,875,500
ADAG NEW 2,666,666 - - 11,199,997
ENGN NEW 6,256,662 - - 10,824,025
WHWK ADDED 2,337,102 2,082,000 12.25% 10,703,927
DDOG REDUCED 40,000 54,300 -26.34% 10,414,400
NOW ADDED 100,000 87,090 14.82% 9,928,000
AVGO ADDED 25,000 15,000 66.67% 9,443,750
IONQ UNCHANGED 170,000 170,000 0.0% 9,054,200
FROG REDUCED 95,500 128,816 -25.86% 8,679,040
OCS NEW 625,000 - - 8,668,750
IREN ADDED 175,000 43,100 306.03% 8,002,750
AMZN REDUCED 32,500 46,641 -30.32% 7,746,050
CRWD REDUCED 10,000 23,070 -56.65% 7,631,400
DSGN NEW 523,212 - - 7,570,878
PDD ADDED 95,000 83,401 13.91% 7,246,600
MSLE UNCHANGED 892,074 892,074 0.0% 6,935,875
DT ADDED 155,000 150,000 3.33% 6,806,050
AAPL NEW 23,000 - - 6,655,280
TENX UNCHANGED 427,141 427,141 0.0% 6,214,902
VTVT UNCHANGED 163,000 163,000 0.0% 6,136,950
ELOX NEW 400,000 - - 5,552,000
AGMB UNCHANGED 411,250 411,250 0.0% 5,338,025
BABA NEW 50,000 - - 4,799,000
KRRO UNCHANGED 347,718 347,718 0.0% 4,582,923
CLBT UNCHANGED 311,544 311,544 0.0% 4,548,542
IVVD ADDED 5,000,000 4,000,000 25.0% 4,362,000
OUST NEW 67,500 - - 4,220,100
PALI NEW 2,000,000 - - 4,180,000
AEVA ADDED 145,459 110,000 32.24% 4,177,582
SEER UNCHANGED 2,458,673 2,458,673 0.0% 4,081,397
NBP REDUCED 2,004,739 3,000,000 -33.18% 3,909,241
GTLB ADDED 125,000 100,000 25.0% 3,816,250
ODTX NEW 200,000 - - 3,742,000
FHTX UNCHANGED 720,720 720,720 0.0% 3,517,114
AGEN UNCHANGED 1,064,250 1,064,250 0.0% 3,256,605
MNDY ADDED 42,500 25,000 70.0% 3,076,575
ZTS NEW 35,000 - - 2,515,100
WK REDUCED 45,000 92,500 -51.35% 2,182,950
NFLX NEW 25,000 - - 1,784,925
KLRS UNCHANGED 435,798 435,798 0.0% 1,773,698
QNT NEW 20,000 - - 1,634,800
RANI UNCHANGED 2,000,000 2,000,000 0.0% 1,520,800
TSLA REDUCED 3,500 21,500 -83.72% 1,472,100
BEKE UNCHANGED 100,000 100,000 0.0% 1,453,000
ENTX NEW 736,457 - - 1,303,529
MDLN UNCHANGED 25,000 25,000 0.0% 986,000
LITE NEW 1,055 - - 905,253
FIG UNCHANGED 50,000 50,000 0.0% 904,500
GOSS UNCHANGED 5,208,968 5,208,968 0.0% 857,396
FOXA NEW 10,000 - - 521,600
T NEW 25,000 - - 517,500
NU UNCHANGED 25,000 25,000 0.0% 334,000
WVE CLOSED OUT 0 2,450,000 -100.0% 0
FULC CLOSED OUT 0 2,350,000 -100.0% 0
BCYC CLOSED OUT 0 1,560,882 -100.0% 0
FPS CLOSED OUT 0 100,000 -100.0% 0
AS CLOSED OUT 0 50,000 -100.0% 0
PRMB CLOSED OUT 0 50,000 -100.0% 0
MU CLOSED OUT 0 6,000 -100.0% 0

Holdings (latest quarter)

TickerChangeIssuerClassCUSIPValue ($)Weight %Shares
SRRK REDUCED Scholar Rock Holding Corp COM 80706P103 526,625,715 10.66 9575013.0
KYMR REDUCED Kymera Therapeutics Inc COM 501575104 336,651,626 6.81 2935830.0
ERAS ADDED Erasca Inc COM 29479A108 208,807,348 4.23 1.1397781E7
MANE ADDED Veradermics Inc COMMON STOCK 922967104 203,511,680 4.12 1655374.0
TNGX ADDED Tango Therapeutics Inc COM 87583X109 193,166,919 3.91 6179364.0
RVMD REDUCED Revolution Medicines Inc COM 76155X100 168,552,000 3.41 900000.0
BCAX REDUCED Bicara Therapeutics Inc COM 055477103 166,352,179 3.37 5602970.0
ARWR ADDED Arrowhead Pharmaceuticals Inc COM 04280A100 139,828,449 2.83 1715476.0
ONC UNCHANGED BeOne Medicines AG SPONSORED ADS 07725L102 132,511,050 2.68 465000.0
EWTX REDUCED Edgewise Therapeutics Inc COM 28036F105 129,391,476 2.62 3184629.0
RYTM ADDED Rhythm Pharmaceuticals Inc COM 76243J105 126,160,613 2.55 1136275.0
LXRX UNCHANGED Lexicon Pharmaceuticals Inc COM NEW 528872302 106,328,443 2.15 4.4303518E7
ELVN ADDED Enliven Therapeutics Inc COM 29337E102 90,051,358 1.82 1774411.0
SYRE ADDED Spyre Therapeutics Inc COM NEW 00773J202 85,992,130 1.74 968598.0
PBLS NEW Parabilis Medicines Inc COM 698955101 81,898,129 1.66 2992259.0
XENE UNCHANGED Xenon Pharmaceuticals Inc COM 98420N105 79,588,523 1.61 1318564.0
SLDB UNCHANGED Solid Biosciences Inc COM NEW 83422E204 76,827,146 1.55 7690405.0
- Abivax SA SPONSORED ADS 00370M103 76,757,760 1.55 576000.0
COAG NEW Hemab Therapeutics Holdings Inc COM SHS 423494103 76,649,413 1.55 2086834.0
COGT ADDED Cogent Biosciences Inc COM 19240Q201 71,954,097 1.46 1859279.0
RLAY NEW Relay Therapeutics Inc COM 75943R102 68,291,500 1.38 3650000.0
TSHA ADDED Taysha Gene Therapies Inc COM SHS 877619106 67,055,203 1.36 9846579.0
DFTX ADDED Definium Therapeutics Inc COM SHS 24477V105 66,772,951 1.35 1419493.0
STOK UNCHANGED Stoke Therapeutics Inc COM 86150R107 65,287,754 1.32 1995347.0
IRON REDUCED Disc Medicine Inc COM 254604101 64,977,649 1.31 888401.0
CYTK ADDED Cytokinetics Inc COM NEW 23282W605 64,655,121 1.31 758952.0
SEPN REDUCED Septerna Inc COM 81734D104 63,631,000 1.29 1900000.0
OLMA ADDED Olema Pharmaceuticals Inc COM 68062P106 60,760,432 1.23 4856949.0
RCUS REDUCED Arcus Biosciences Inc COM 03969F109 53,798,350 1.09 1745000.0
- Crinetics Pharmaceuticals Inc COM 22663K107 53,165,887 1.08 1420788.0
KLRA NEW Kailera Therapeutics Inc COMMON STOCK 482931102 48,780,721 0.99 2214286.0
DYN REDUCED Dyne Therapeutics, Inc COM 26818M108 47,287,866 0.96 2129125.0
GPCR REDUCED Structure Therapeutics Inc SPONSORED ADS 86366E106 46,852,139 0.95 872967.0
TBLA REDUCED Taboola.com Ltd ORD SHS M8744T106 42,117,050 0.85 8423410.0
PVLA UNCHANGED Palvella Therapeutics Inc COM 697947109 39,348,858 0.8 257485.0
SLN ADDED Silence Therapeutics PLC ADS 82686Q101 36,359,589 0.74 3311438.0
DNLI UNCHANGED Denali Therapeutics Inc COM 24823R105 35,918,314 0.73 1396513.0
RELY UNCHANGED Remitly Global Inc COM 75960P104 34,584,703 0.7 1543271.0
CGEM ADDED Cullinan Therapeutics Inc COM 230031106 34,478,996 0.7 1893410.0
- Capital One Finl Corp COM 14040H105 34,429,401 0.7 171615.0
TRVI UNCHANGED Trevi Therapeutics Inc COM 89532M101 33,325,070 0.67 1786867.0
GOOGL ADDED Alphabet Inc CAP STK CL A 02079K305 32,163,300 0.65 90000.0
- Dbv Technologies SA SPONSORED ADS 23306J309 30,460,737 0.62 1857362.0
ABSI ADDED Absci Corp COM 00091E109 28,682,515 0.58 2474764.0
SION ADDED Sionna Therapeutics Inc COM 829401108 26,856,555 0.54 610515.0
RAPP UNCHANGED Rapport Therapeutics Inc COM 75383L102 26,730,013 0.54 641469.0
AMLX ADDED Amylyx Pharmaceuticals Inc COM 03237H101 26,591,325 0.54 1480586.0
ANNX ADDED Annexon Inc COM 03589W102 25,458,869 0.52 4458646.0
MNPR UNCHANGED Monopar Therapeutics Inc COM NEW 61023L207 25,010,226 0.51 270118.0
ORKA NEW Oruka Therapeutics Inc COM 687604108 23,792,500 0.48 250000.0
SPTX NEW Seaport Therapeutics Inc COMMON STOCK 81221K108 23,790,264 0.48 1095316.0
DMRA UNCHANGED Damora Therapeutics Inc COM NEW 36322Q206 23,409,000 0.47 900000.0
TYRA NEW Tyra Biosciences Inc COM 90240B106 23,156,500 0.47 725000.0
ZURA UNCHANGED Zura Bio Ltd CLASS A ORD SHS G9TY5A101 22,035,709 0.45 3734866.0
ORIC UNCHANGED Oric Pharmaceuticals Inc COM 68622P109 21,558,382 0.44 1990617.0
TSM ADDED Taiwan Semiconductor Manufacturing Co Ltd SPONSORED ADS 874039100 21,347,379 0.43 44700.0
RCUS REDUCED Arcus Biosciences Inc COM 03969F109 20,823,507 0.42 675430.0
NVDA ADDED NVIDIA Corp COM 67066G104 19,008,550 0.38 95000.0
RZLT UNCHANGED Rezolute Inc COM NEW 76200L309 17,307,092 0.35 3328287.0
MPLT UNCHANGED MapLight Therapeutics Inc COM 56565P103 16,128,000 0.33 450000.0
NMRA UNCHANGED Neumora Therapeutics Inc COM 640979100 14,446,297 0.29 8497822.0
- Nebius Group NV SHS CLASS A N97284108 14,360,840 0.29 52000.0
MSFT ADDED Microsoft Corp COM 594918104 13,988,250 0.28 37500.0
CTMX UNCHANGED CytomX Therapeutics Inc COM 23284F105 12,966,416 0.26 3457711.0
GENB UNCHANGED Generate Biomedicines Inc COM SHS 370920100 12,418,075 0.25 736104.0
IKT UNCHANGED Inhibikase Therapeutics Inc COM NEW 45719W205 11,875,500 0.24 5850000.0
ADAG NEW Adagene Inc ADS 005329107 11,199,997 0.23 2666666.0
ORIC UNCHANGED Oric Pharmaceuticals Inc COM 68622P109 10,912,037 0.22 1007575.0
ENGN NEW enGene Therapeutics Inc COM 29286X101 10,824,025 0.22 6256662.0
WHWK ADDED Whitehawk Therapeutics Inc COM 00032Q104 10,703,927 0.22 2337102.0
DDOG REDUCED Datadog Inc CL A COM 23804L103 10,414,400 0.21 40000.0
NOW ADDED ServiceNow Inc COM 81762P102 9,928,000 0.2 100000.0
AVGO ADDED Broadcom Inc COM 11135F101 9,443,750 0.19 25000.0
IONQ UNCHANGED IONQ Inc COM 46222L108 9,054,200 0.18 170000.0
MSFT ADDED Microsoft Corp COM 594918104 8,952,480 0.18 24000.0
FROG REDUCED Jfrog Ltd ORD SHS M6191J100 8,679,040 0.18 95500.0
OCS NEW Oculis Holding AG ORDINARY SHARES H5870P102 8,668,750 0.18 625000.0
IREN ADDED IREN Ltd ORDINARY SHARES Q4982L109 8,002,750 0.16 175000.0
AMZN REDUCED Amazon.com Inc COM 023135106 7,746,050 0.16 32500.0
CRWD REDUCED CrowdStrike Holdings Inc CL A 22788C105 7,631,400 0.15 10000.0
DSGN NEW Design Therapeutics Inc COM 25056L103 7,570,878 0.15 523212.0
PDD ADDED PDD Holdings Inc SPONSORED ADS 722304102 7,246,600 0.15 95000.0
MSLE UNCHANGED Satellos Bioscience Inc COM 80401L803 6,935,875 0.14 892074.0
DT ADDED Dynatrace, Inc COM NEW 268150109 6,806,050 0.14 155000.0
AAPL NEW Apple Inc COM 037833100 6,655,280 0.13 23000.0
TENX UNCHANGED Tenax Therapeutics Inc COM NEW 88032L605 6,214,902 0.13 427141.0
VTVT UNCHANGED vTv Therapeutics Inc CL A NEW 918385204 6,136,950 0.12 163000.0
ELOX NEW Eloxx Pharmaceuticals Inc COM NEW 29014R301 5,552,000 0.11 400000.0
AGMB UNCHANGED Agomab Therapeutics NV SPONSORED ADS 00860C102 5,338,025 0.11 411250.0
BABA NEW Alibaba Group Holding Ltd SPONSORED ADS 01609W102 4,799,000 0.1 50000.0
KRRO UNCHANGED Korro Bio Inc COM 500946108 4,582,923 0.09 347718.0
CLBT UNCHANGED Cellebrite DI Ltd ORDINARY SHARES M2197Q107 4,548,542 0.09 311544.0
IVVD ADDED Invivyd Inc COM 00534A102 4,362,000 0.09 5000000.0
OUST NEW Ouster Inc COM NEW 68989M202 4,220,100 0.09 67500.0
PALI NEW Palisade Bio Inc COM 696389402 4,180,000 0.08 2000000.0
AEVA ADDED Aeva Technologies Inc COM NEW 00835Q202 4,177,582 0.08 145459.0
SEER UNCHANGED Seer Inc COM CL A 81578P106 4,081,397 0.08 2458673.0
NBP REDUCED NovaBridge Biosciences SPONSORED ADS 44975P103 3,909,241 0.08 2004739.0
GTLB ADDED GitLab Inc CLASS A COM 37637K108 3,816,250 0.08 125000.0
ODTX NEW Odyssey Therapeutics Inc COMMON STOCK 67613T104 3,742,000 0.08 200000.0
FHTX UNCHANGED Foghorn Therapeutics Inc COM 344174107 3,517,114 0.07 720720.0
AGEN UNCHANGED Agenus Inc COM NEW 00847G804 3,256,605 0.07 1064250.0
MNDY ADDED monday.com Ltd SHS M7S64H106 3,076,575 0.06 42500.0
ZTS NEW Zoetis Inc CL A 98978V103 2,515,100 0.05 35000.0
WK REDUCED Workiva Inc COM CL A 98139A105 2,182,950 0.04 45000.0
NFLX NEW Netflix Inc COM 64110L106 1,784,925 0.04 25000.0
KLRS UNCHANGED Kalaris Therapeutics Inc COM 482929106 1,773,698 0.04 435798.0
QNT NEW Quantinuum Inc CL A COM 74768A104 1,634,800 0.03 20000.0
RANI UNCHANGED Rani Therapeutics Holdings Inc COM CL A 753018100 1,520,800 0.03 2000000.0
TSLA REDUCED Tesla Inc COM 88160R101 1,472,100 0.03 3500.0
BEKE UNCHANGED KE Holdings Inc SPONSORED ADS 482497104 1,453,000 0.03 100000.0
ENTX NEW Entera Bio Ltd SHS M40527109 1,303,529 0.03 736457.0
MDLN UNCHANGED Medline Inc COM CL A 58507V107 986,000 0.02 25000.0
LITE NEW Lumentum Holdings Inc COM 55024U109 905,253 0.02 1055.0
FIG UNCHANGED Figma Inc CLASS A COM STK 316841105 904,500 0.02 50000.0
GOSS UNCHANGED Gossamer Bio Inc COM 38341P102 857,396 0.02 5208968.0
FOXA NEW Fox Corp CL A COM 35137L105 521,600 0.01 10000.0
T NEW AT&T Inc COM 00206R102 517,500 0.01 25000.0
NU UNCHANGED Nu Holdings Ltd. ORD SHS CL A G6683N103 334,000 0.01 25000.0

Quarterly portfolios

PeriodFiledValue ($)PositionsVol %BetaMax DD %
2026-06-30 2026-08-13 4,941,404,255 119 13.825837 0.215281 34.074801
2026-03-31 2026-05-14 3,607,379,030 102 14.051358 0.210456 33.66224
2025-12-31 2026-02-13 3,352,424,599 115 13.017928 0.19824 31.060483
2025-09-30 2025-11-13 2,556,293,148 117 12.256921 0.199232 28.891117
2025-03-31 2025-05-23 1,772,780,355 117 9.608555 0.166504 21.315468
2024-12-31 2025-02-14 2,263,488,311 119 10.236613 0.154189 26.00772