EcoR1 Capital, LLC Q1 2019 Filing
Filed May 15, 2019
Portfolio Value
$1.1T
Holdings
41
Report Date
Q1 2019
Filing Type
13F-HR
All Holdings (41 positions)
| # | Stock | Shares | Value | % Portfolio | Type |
|---|---|---|---|---|---|
| 1 | ARGXARGENX SE | 825,087 | $103.0B | 9.50% | |
| 2 | KURAKURA ONCOLOGY INC | 5,276,753 | $87.5B | 8.07% | |
| 3 | MRTXEURMIRATI THERAPEUTICS INC | 1,000,000 | $73.3B | 6.76% | |
| 4 | CRSPCRISPR THERAPEUTICS AG | 1,878,277 | $67.1B | 6.18% | |
| 5 | XNCRXENCOR INC | 2,059,429 | $64.0B | 5.90% | |
| 6 | —SPARK THERAPEUTICS INC | 529,000 | $60.2B | 5.55% | |
| 7 | IRWDIRONWOOD PHARMACEUTICALS INC | 4,397,168 | $59.5B | 5.48% | |
| 8 | —FIBROGEN INC | 1,000,000 | $54.4B | 5.01% | Put |
| 9 | —DICERNA PHARMACEUTICALS INC | 3,316,407 | $48.6B | 4.48% | |
| 10 | ASNDASCENDIS PHARMA A S | 360,819 | $42.5B | 3.91% | |
| 11 | ASNDASCENDIS PHARMA A S | 360,000 | $42.4B | 3.91% | Put |
| 12 | RAREULTRAGENYX PHARMACEUTICAL INC | 497,899 | $34.5B | 3.18% | |
| 13 | —MIRATI THERAPEUTICS INC | 348,900 | $25.6B | 2.36% | Call |
| 14 | —MYOKARDIA INC | 478,574 | $24.9B | 2.29% | |
| 15 | —FIBROGEN INC | 440,800 | $24.0B | 2.21% | Call |
| 16 | ASMBASSEMBLY BIOSCIENCES INC | 1,153,599 | $22.7B | 2.09% | |
| 17 | CLDNEUREIGER BIOPHARMACEUTICALS INC | 1,595,643 | $22.3B | 2.06% | |
| 18 | —MAGENTA THERAPEUTICS INC | 1,277,787 | $21.0B | 1.94% | |
| 19 | GOSSGOSSAMER BIO INC | 772,096 | $16.7B | 1.54% | |
| 20 | —CHIASMA INC | 3,043,827 | $15.8B | 1.46% | |
| 21 | KZRKEZAR LIFE SCIENCES INC | 856,471 | $15.2B | 1.40% | |
| 22 | IRWDIRONWOOD PHARMACUTICALS INC | 1,084,600 | $14.7B | 1.35% | Call |
| 23 | —HARPOON THERAPEUTICS INC | 1,336,423 | $12.7B | 1.17% | |
| 24 | RCUSARCUS BIOSCIENCES INC | 990,146 | $12.4B | 1.14% | |
| 25 | —MERSANA THERAPEUTICS INC | 2,300,000 | $12.1B | 1.12% | |
| 26 | RUBYUSDRUBIUS THERAPEUTICS INC | 646,228 | $11.7B | 1.08% | |
| 27 | RYTMRHYTHM PHARMACEUTICALS INC | 400,838 | $11.0B | 1.01% | |
| 28 | SURFUSDSURFACE ONCOLOGY INC | 2,263,488 | $10.8B | 1.00% | |
| 29 | FGENEURFIBROGEN INC | 168,382 | $9.2B | 0.84% | |
| 30 | PRTAPROTHENA CORP PLC | 726,519 | $8.8B | 0.81% | |
| 31 | RCKTROCKET PHARMACEUTICALS INC | 450,000 | $7.9B | 0.73% | |
| 32 | I9DNARBUTUS BIOPHARMA CORP | 2,172,883 | $7.8B | 0.72% | |
| 33 | —ADURO BIOTECH INC | 1,939,390 | $7.7B | 0.71% | |
| 34 | —UNITY BIOTECHNOLOGY INC | 906,614 | $7.4B | 0.68% | |
| 35 | SRRKSCHOLAR ROCK HOLDING CORP | 338,668 | $6.4B | 0.59% | |
| 36 | —AQUINOX PHARMACEUTICALS INC | 2,265,880 | $6.1B | 0.56% | |
| 37 | —CURIS INC | 2,982,208 | $5.9B | 0.55% | |
| 38 | ZLABZAI LAB LTD | 78,519 | $2.3B | 0.21% | |
| 39 | VCELVERICEL CORP | 131,001 | $2.3B | 0.21% | |
| 40 | —SIENNA BIOPHARMACEUTICALS INC | 800,000 | $1.9B | 0.17% | |
| 41 | ARVNARVINAS INC | 50,000 | $738.0M | 0.07% |