Q3 2023 · 13F-HR
EcoR1 Capital, LLCholdings as filed
Filed 2023-11-14 · accession 0000935836-23-000696
$2.96B
Reported value
51
Positions
2023-09-30
Period end
Holdings as filed
| CUSIP | Ticker | Issuer | Value | % port. | Shares | Class | Voting |
|---|---|---|---|---|---|---|---|
| G72800108 | PRTA | PROTHENA CORP PLC | $558.9M | 18.9% | 11,584,280 | Common | SOLE |
| 03753U106 | APLSUSD | APELLIS PHARMACEUTICALS INC | $414.6M | 14.0% | 10,899,859 | Common | SOLE |
| 60468T105 | MRTXEUR | MIRATI THERAPEUTICS INC | $250.4M | 8.45% | 5,748,399 | Common | SOLE |
| 36315X101 | LKFT | GALAPAGOS NV | $198.9M | 6.71% | 5,756,268 | Common | SOLE |
| 76155X100 | RVMD | REVOLUTION MEDICINES INC | $154.4M | 5.21% | 5,577,863 | Common | SOLE |
| 032724106 | ANAB | ANAPTYSBIO INC | $135.1M | 4.56% | 7,521,024 | Common | SOLE |
| 004225108 | ACAD | ACADIA PHARMACEUTICALS INC | $124.9M | 4.21% | 5,991,479 | Common | SOLE |
| 04335A105 | ARVN | ARVINAS INC | $107.4M | 3.62% | 5,467,063 | Common | SOLE |
| 98401F105 | XNCR | XENCOR INC | $106.4M | 3.59% | 5,282,516 | Common | SOLE |
| 87583X109 | TNGX | TANGO THERAPEUTICS INC | $98.2M | 3.31% | 8,721,636 | Common | SOLE |
| 98985Y108 | ZYME | ZYMEWORKS INC | $85.2M | 2.87% | 13,437,473 | Common | SOLE |
| 85205L107 | SWTXUSD | SPRINGWORKS THERAPEUTICS INC | $80.0M | 2.70% | 3,460,208 | Common | SOLE |
| 50127T109 | KURA | KURA ONCOLOGY INC | $53.0M | 1.79% | 5,806,871 | Common | SOLE |
| G50871105 | JAZZ | JAZZ PHARMACEUTICALS PLC | $47.7M | 1.61% | 368,411 | Common | SOLE |
| 22663K107 | CRNX | CRINETICS PHARMACEUTICALS IN | $45.5M | 1.54% | 1,530,263 | Common | SOLE |
| 152309100 | CNTA | CENTESSA PHARMACEUTICALS PLC | $36.4M | 1.23% | 5,618,779 | Common | SOLE |
| 75943R102 | RLAY | RELAY THERAPEUTICS INC | $35.0M | 1.18% | 4,163,824 | Common | SOLE |
| 61775R105 | MORFUSD | MORPHIC HLDG INC | $33.9M | 1.14% | 1,480,190 | Common | SOLE |
| 92915B106 | VYGR | VOYAGER THERAPEUTICS INC | $29.8M | 1.01% | 3,851,507 | Common | SOLE |
| 640979100 | NMRA | NEUMORA THERAPEUTICS INC. | $29.2M | 0.99% | 2,071,450 | Common | SOLE |
| 03753U106 | APLSUSD | APELLIS PHARMACEUTICALS INC | $27.9M | 0.94% | 732,500 | CALL | SOLE |
| 014442107 | ALEC | ALECTOR INC | $26.3M | 0.89% | 4,056,548 | Common | SOLE |
| 67080N101 | NUVB | NUVATION BIO INC | $25.7M | 0.87% | 19,209,643 | Common | SOLE |
| 59045L106 | — | MERSANA THERAPEUTICS INC | $24.6M | 0.83% | 19,364,688 | Common | SOLE |
| 690469101 | OVID | OVID THERAPEUTICS INC | $23.5M | 0.79% | 6,117,400 | Common | SOLE |
| 38870X104 | GRPH | GRAPHITE BIO INC | $21.2M | 0.71% | 8,538,446 | Common | SOLE |
| 04683R106 | AVIR | ATEA PHARMACEUTICALS INC | $21.0M | 0.71% | 6,995,861 | Common | SOLE |
| 68622P109 | ORIC | ORIC PHARMACEUTICALS INC | $20.7M | 0.70% | 3,418,068 | Common | SOLE |
| 28036F105 | EWTX | EDGEWISE THERAPEUTICS INC | $20.0M | 0.68% | 3,493,194 | Common | SOLE |
| 88427A107 | — | THIRD HARMONIC BIO INC | $19.1M | 0.64% | 2,982,444 | Common | SOLE |
| 00445A100 | — | ACELYRIN INC | $14.3M | 0.48% | 1,402,201 | Common | SOLE |
| 019770106 | ALLO | ALLOGENE THERAPEUTICS INC | $14.2M | 0.48% | 4,488,200 | Common | SOLE |
| 89854M101 | TCRX | TSCAN THERAPEUTICS INC | $12.8M | 0.43% | 5,000,000 | Common | SOLE |
| 24344T101 | DCPHEUR | DECIPHERA PHARMACEUTICALS IN | $12.6M | 0.43% | 993,000 | Common | SOLE |
| 37148K100 | GBIOGBX | GENERATION BIO CO | $7.8M | 0.26% | 2,046,867 | Common | SOLE |
| 38341P102 | GOSS | GOSSAMER BIO INC | $7.7M | 0.26% | 9,195,404 | Common | SOLE |
| 71722W107 | PHAT | PHATHOM PHARMACEUTICALS INC | $7.3M | 0.24% | 700,000 | Common | SOLE |
| 62921N105 | NGMUSD | NGM BIOPHARMACEUTICALS INC | $6.9M | 0.23% | 6,435,518 | Common | SOLE |
| 74168J101 | PRME | PRIME MEDICINE INC | $5.7M | 0.19% | 600,000 | Common | SOLE |
| N71542109 | PRQR | PROQR THRAPEUTICS N V | $3.9M | 0.13% | 2,980,016 | Common | SOLE |
| 74065P101 | PRLD | PRELUDE THERAPEUTICS INC | $3.6M | 0.12% | 1,157,452 | Common | SOLE |
| 01626L105 | — | ALIGOS THERAPEUTICS INC | $2.9M | 0.10% | 3,948,360 | Common | SOLE |
| 43906K100 | HOOKGBP | HOOKIPA PHARMA INC | $2.8M | 0.10% | 4,595,024 | Common | SOLE |
| 00773J202 | SYRE | AEGLEA BIOTHERAPEUTICS INC | $2.4M | 0.08% | 199,996 | Common | SOLE |
| 01671P100 | ALLKGUSD | ALLAKOS INC | $1.7M | 0.06% | 748,900 | Common | SOLE |
| 67080N119 | NUVB/WS | NUVATION BIO INC | $1.3M | 0.04% | 963,333 | Common | SOLE |
| 76155X100 | RVMD | REVOLUTION MEDICINES INC | $866,384 | 0.03% | 31,300 | CALL | SOLE |
| N62509117 | NAMSW | NEWAMSTERDAM PHARMA COMPANY | $616,651 | 0.02% | 66,665 | Common | SOLE |
| 87978U108 | OVASUSD | TEMPEST THERAPEUTICS INC | $283,676 | 0.01% | 931,000 | Common | SOLE |
| 14171W111 | — | CAREMAX INC | $212,000 | 0.01% | 100,000 | Common | SOLE |
| 86889P117 | SRZNW | SURROZEN INC | $32,666 | 0.00% | 66,665 | Common | SOLE |
Source: SEC EDGAR · raw 13F holdings as filed. The Class column shows the option type when reported (Put/Call) or Common when the issuer's equity is held directly. 13F discloses long positions only.