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Siren, L.L.C.

Q1 2026 · Filed 2026-05-14
Market Value
$3.4B
+10.9%
Holdings
117
-6
New Purchases
18
Added To
32
Closed
26
Reduced
18
Top 10 Concentration
52.6%
Turnover
37.6%

Top Buys (by % of Portfolio)

SymbolCur %Prior %Chg %Value
ERAS 5.33% 1.06% +4.27% $182M
MANE 2.78% 0.00% +2.78% $95M
CYTK 1.18% 0.00% +1.18% $40M
TNGX 3.46% 2.35% +1.12% $118M
XENE 2.24% 1.18% +1.06% $77M
ELVN 0.86% 0.00% +0.86% $29M
ORIC 1.11% 0.27% +0.84% $38M
PVLA 0.94% 0.25% +0.68% $32M
DMRA 0.68% 0.00% +0.68% $23M
ANNX 0.64% 0.00% +0.64% $22M
LXRX 2.02% 1.45% +0.57% $69M
BCAX 3.38% 2.85% +0.53% $115M
DFTX 0.51% 0.00% +0.51% $17M
AMLX 0.50% 0.00% +0.50% $17M
QURE 0.48% 0.00% +0.48% $16M

Top Sells (by % of Portfolio)

SymbolCur %Prior %Chg %Value
APLS 0.00% 2.10% -2.10% $0
CNTA 1.23% 3.27% -2.04% $42M
RAPT 0.00% 1.51% -1.51% $0
DYN 1.18% 2.22% -1.04% $40M
ONC 4.04% 4.93% -0.89% $138M
WVE 0.52% 1.35% -0.83% $18M
MLYS 0.00% 0.82% -0.82% $0
IRON 1.85% 2.55% -0.70% $63M
TSHA 1.16% 1.81% -0.65% $39M
OLMA 2.08% 2.68% -0.60% $71M
TBLA 0.90% 1.49% -0.59% $31M
IHS 0.00% 0.57% -0.57% $0
GPCR 1.87% 2.44% -0.56% $64M
KYMR 7.77% 8.30% -0.53% $265M
UPB 0.00% 0.52% -0.52% $0

Sector Allocation Over Time

Market Cap Concentration

TierHoldingsValueWeight
Mega Cap 11 $88M 2.6%
Large Cap 21 $411M 12.0%
Mid Cap 34 $2.1B 61.6%
Small Cap 34 $756M 22.1%
Micro Cap 17 $57M 1.7%

Portfolio Analytics

Avg Market Cap
$221.7B
Median Market Cap
$2.7B
Avg P/E
70.1
Median P/E
35.0
Avg Dividend Yield
0.00%
Avg Beta
1.22
# Stocks
117
# ETFs / Funds
0

Top Holdings (117 total)

# Symbol % Port Shares Value Avg Price Q/Q Value Chg Share Chg Chg % Status
1 SRRK 15.58% 10,825,013 $532M $49.16 $55M
2 KYMR 7.77% 3,186,830 $265M $83.29 $10M -100,000 -3.0%
3 ERAS 5.33% 11,244,246 $182M $16.18 $149M +2,486,997 +28.4%
4 EWTX 4.09% 4,430,263 $140M $31.50 $27M -99,727 -2.2%
5 ONC 4.04% 465,000 $138M $296.97 -$14M -35,000 -7.0%
6 TNGX 3.46% 5,657,105 $118M $20.92 $46M -2,508,269 -30.7%
7 BCAX 3.38% 5,802,970 $115M $19.89 $28M +586,001 +11.2%
8 RVMD 3.16% 1,110,980 $108M $97.25 $2M -224,095 -16.8%
9 ARWR 2.97% 1,615,476 $101M $62.70 $2M +115,000 +7.7%
10 MANE 2.78% 1,505,374 $95M $63.15 +1,505,374 NEW
11 XENE 2.24% 1,318,564 $77M $58.15 $40M +505,803 +62.2%
12 OLMA 2.08% 4,756,949 $71M $14.91 -$12M +1,456,249 +44.1%
13 CRNX 2.02% 1,903,636 $69M $36.32 -$1M +396,000 +26.3%
14 LXRX 2.02% 44,303,518 $69M $1.56 $24M +5,384,615 +13.8%
15 COGT 1.93% 1,709,279 $66M $38.49 $8M +80,000 +4.9%
16 STOK 1.90% 1,995,347 $65M $32.56 -$6M -252,000 -11.2%
17 RCUS 1.90% 3,007,077 $65M $21.60 -$7M
18 GPCR 1.87% 1,328,698 $64M $48.20 -$11M +250,000 +23.2%
19 IRON 1.85% 988,401 $63M $63.94 -$15M
20 RYTM 1.85% 725,511 $63M $86.97 $10M +225,536 +45.1%
21 SEPN 1.41% 2,000,000 $48M $24.03 -$8M
22 CNTA 1.23% 1,053,464 $42M $39.72 -$59M -2,974,053 -73.8%
23 SYRE 1.21% 818,598 $41M $50.44 $14M
24 CYTK 1.18% 613,952 $40M $65.91 +613,952 NEW
25 DYN 1.18% 2,229,125 $40M $18.13 -$28M -1,273,816 -36.4%
26 TSHA 1.16% 8,829,913 $39M $4.47 -$16M -1,300,000 -12.8%
27 ORIC 1.11% 2,998,192 $38M $12.67 $30M +1,990,617 +197.6%
28 PVLA 0.94% 257,485 $32M $124.65 $24M +182,485 +243.3%
29 TBLA 0.90% 9,969,495 $31M $3.10 -$15M
30 ELVN 0.86% 746,226 $29M $39.20 +746,226 NEW
31 DNLI 0.79% 1,396,513 $27M $19.20 $4M
32 RELY 0.71% 1,543,271 $24M $15.67 $2M -75,000 -4.6%
33 DMRA 0.68% 900,000 $23M $25.90 +900,000 NEW
34 ANNX 0.64% 3,958,646 $22M $5.54 +3,958,646 NEW
35 TRVI 0.62% 1,786,867 $21M $11.93 -$7M -500,000 -21.9%
36 RAPP 0.59% 641,469 $20M $31.29 -$1M -67,000 -9.5%
37 GOOGL 0.55% 65,703 $19M $287.56 $12M +45,000 +217.4%
38 FULC 0.53% 2,350,000 $18M $7.67 -$4M +400,000 +20.5%
39 WVE 0.52% 2,450,000 $18M $7.25 -$24M
40 DFTX 0.51% 919,493 $17M $18.90 +919,493 NEW
41 AMLX 0.50% 1,230,000 $17M $13.90 +1,230,000 NEW
42 CGEM 0.50% 1,193,410 $17M $14.21 $5M
43 NMRA 0.49% 8,497,822 $17M $1.95 $5M +2,209,039 +35.1%
44 QURE 0.48% 1,000,000 $16M $16.35 +1,000,000 NEW
45 CTMX 0.48% 3,457,711 $16M $4.70 +3,457,711 NEW
46 NVDA 0.45% 89,085 $16M $174.40 $9M +51,600 +137.7%
47 SLN 0.45% 2,911,438 $15M $5.27 -$2M
48 MSFT 0.45% 41,380 $15M $370.17 $8M +26,380 +175.9%
49 TSM 0.42% 42,200 $14M $337.95 $6M +14,500 +52.4%
50 SION 0.35% 300,000 $12M $40.09 -$315K
51 YNDX 0.35% 113,614 $12M $103.76 $5M +37,396 +49.1%
52 RZLT 0.30% 3,328,287 $10M $3.05 +3,328,287 NEW
53 AMZN 0.28% 46,641 $10M $208.27 -$2M -4,859 -9.4%
54 GENB 0.27% 736,104 $9M $12.50 +736,104 NEW
55 MPLT 0.27% 450,000 $9M $20.33 $1M
56 NOW 0.27% 87,090 $9M $104.55 $4M +51,460 +144.4%
57 CRWD 0.26% 23,070 $9M $390.41 $1M +6,570 +39.8%
58 PDD 0.25% 83,401 $9M $102.18 $1M +20,000 +31.6%
59 TSLA 0.23% 21,500 $8M $371.75 $7M +20,000 +1333.3%
60 IMAB 0.22% 3,000,000 $7M $2.46 -$5M
61 BCYC 0.21% 1,560,882 $7M $4.64 -$7M -451,870 -22.4%
62 WHWK 0.21% 2,082,000 $7M $3.45 $2M
63 DDOG 0.19% 54,300 $6M $118.05 $1M +17,875 +49.1%
64 FROG 0.18% 128,816 $6M $46.93 $198K +35,200 +37.6%
65 DT 0.16% 150,000 $6M $36.98 $553K +34,771 +30.2%
66 WK 0.16% 92,500 $6M $59.63 -$1M +13,377 +16.9%
67 ABSI 0.16% 1,800,000 $5M $3.00 +1,800,000 NEW
68 ADGI 0.15% 4,000,000 $5M $1.30 -$5M
69 MSLE 0.15% 892,074 $5M $5.63 +892,074 NEW
70 IONQ 0.14% 170,000 $5M $28.83 -$3M
71 AVGO 0.14% 15,000 $5M $309.51 $2M +8,000 +114.3%
72 AGMB 0.13% 411,250 $4M $10.49 +411,250 NEW
73 CLBT 0.13% 311,544 $4M $13.78 $2M +161,544 +107.7%
74 SEER 0.12% 2,458,673 $4M $1.68 -$3M -1,541,327 -38.5%
75 KRRO 0.12% 347,718 $4M $11.32 $1M
76 AGEN 0.10% 1,064,250 $4M $3.34 $213K
77 FHTX 0.10% 720,720 $3M $4.78 -$447K
78 FPS 0.09% 100,000 $3M $29.27 +100,000 NEW
79 KLRS 0.07% 435,798 $3M $5.77 -$1M
80 GTLB 0.06% 100,000 $2M $21.64 -$2M +1,000 +1.0%
81 MU 0.06% 6,000 $2M $337.84 +6,000 NEW
82 MNDY 0.05% 25,000 $2M $69.11 -$781K +8,000 +47.1%
83 GOSS 0.05% 5,208,968 $2M $0.33 -$14M
84 BEKE 0.04% 100,000 $1M $14.97 -$788K -45,000 -31.0%
85 IREN 0.04% 43,100 $1M $34.28 -$150K
86 RANI 0.04% 2,000,000 $1M $0.73 -$1M
87 AEVA 0.04% 110,000 $1M $13.16 +110,000 NEW
88 MDLN 0.03% 25,000 $1M $44.50 -$2M -50,000 -66.7%
89 FIG 0.03% 50,000 $1M $21.14 $123K +25,000 +100.0%
90 PRMB 0.03% 50,000 $942K $18.83 -$285K -25,000 -33.3%
91 NU 0.01% 25,000 $359K $14.37 +25,000 NEW
92 MLYS —% -$25M -699,999 -100.0% SOLD
93 CRBU —% -$168K -105,347 -100.0% SOLD
94 QCOM —% -$2M -14,000 -100.0% SOLD
95 PANW —% -$2M -11,450 -100.0% SOLD
96 VRNS —% -$1M -37,500 -100.0% SOLD
97 PEPG —% -$5M -700,000 -100.0% SOLD
98 LXEO —% -$7M -720,622 -100.0% SOLD
99 ZS —% -$3M -12,000 -100.0% SOLD
100 UPB —% -$16M -588,450 -100.0% SOLD

New Positions

SymbolValue% Port
MANE $95M 2.78%
CYTK $40M 1.18%
ELVN $29M 0.86%
DMRA $23M 0.68%
ANNX $22M 0.64%
DFTX $17M 0.51%
AMLX $17M 0.50%
QURE $16M 0.48%
CTMX $16M 0.48%
RZLT $10M 0.30%
GENB $9M 0.27%
ABSI $5M 0.16%
MSLE $5M 0.15%
AGMB $4M 0.13%
FPS $3M 0.09%

Sold Out Positions

SymbolValue% Port
CRM —%
IHS —%
ALMS —%
BDTX —%
CRWV —%
BLLN —%
CRBU —%
MLYS —%
LXEO —%
META —%
ADBE —%
PANW —%
VRNS —%
QCOM —%
ZS —%
View SEC EDGAR Filings for Siren, L.L.C. →

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For informational purposes only. Not investment advice. Data sourced from SEC filings. Privacy Terms