EcoR1 Capital, LLC Quant / Systematic

CIK: 0001587114 · Show all filings

Period: Q1 2015 (← Previous) (Next →)

Filing Date: May 18, 2015

Total Value ($000): $300,071 (92.7% shares, 7.3% debt)

Holdings (23)

— ATARA BIOTHERAPEUTICS 14.7%

Value ($000) $44,197 Shares 1,063,189 Est. Cost $36.04 Unrealized —

— EPIZYME 9.9%

Value ($000) $29,680 Shares 1,580,400 Est. Cost $18.78 Unrealized —

— RECEPTOS 8.3%

Value ($000) $24,948 Shares 151,301 Est. Cost $124.05 Unrealized —

— ARRAY BIOPHARMA SR CONV NT 3.000% Due 06/01/2020 7.3%

Value ($000) $21,973 Shares 17,500,000 Est. Cost $0.93 Unrealized —

— ASSEMBLY BIOSCIENCES 6.9%

Value ($000) $20,841 Shares 1,574,107 Est. Cost $9.79 Unrealized —

— CLOVIS ONCOLOGY 6.2%

Value ($000) $18,558 Shares 2,500 Est. Cost — Unrealized —

— CLOVIS ONCOLOGY 6.0%

Value ($000) $18,041 Shares 243,048 Est. Cost $56.00 Unrealized —

— KITE PHARMA 5.4%

Value ($000) $16,231 Shares 281,400 Est. Cost $57.67 Unrealized —

— FLEX PHARMA 5.3%

Value ($000) $15,792 Shares 805,691 Est. Cost $19.60 Unrealized —

IRWD IRONWOOD PHARMACEUTICALS CL A 4.8%

Value ($000) $14,400 Shares 900,000 Est. Cost $11.44 Unrealized +14.6%

— FIBROGEN 4.2%

Value ($000) $12,552 Shares 400,000 Est. Cost $27.34 Unrealized —

— RETROPHIN 3.3%

Value ($000) $9,824 Shares 410,000 Est. Cost $23.96 Unrealized —

— KINDRED BIOSCIENCES 3.1%

Value ($000) $9,242 Shares 1,294,431 Est. Cost $7.45 Unrealized —

IRWD IRONWOOD PHARMACEUTICALS CL A 2.7%

Value ($000) $8,000 Shares 5,000 Est. Cost $11.44 Unrealized +14.6%

— GENVEC 2.0%

Value ($000) $5,860 Shares 1,986,413 Est. Cost $2.08 Unrealized —

— SAGE THERAPEUTICS INC 1.9%

Value ($000) $5,649 Shares 112,455 Est. Cost $18.47 Unrealized —

— ARRAY BIOPHARMA 1.8%

Value ($000) $5,417 Shares 7,350 Est. Cost — Unrealized —

— CALITHERA BIOSCIENCES 1.6%

Value ($000) $4,852 Shares 295,480 Est. Cost $19.00 Unrealized —

— FORWARD PHARMA A/S SPONSORED ADR 1.5%

Value ($000) $4,502 Shares 158,985 Est. Cost $23.61 Unrealized —

XENE XENON PHARMACEUTICALS 1.2%

Value ($000) $3,720 Shares 220,570 Est. Cost $14.68 Unrealized +25.8%

— FLEXION THERAPEUTICS 1.2%

Value ($000) $3,669 Shares 162,900 Est. Cost $22.52 Unrealized —

— TARGACEPT 0.6%

Value ($000) $1,841 Shares 619,699 Est. Cost $2.63 Unrealized —

— EPIZYME 0.1%

Value ($000) $282 Shares 150 Est. Cost — Unrealized —

Ticker	Issuer	Shares	Value ($000)	%	Est. Cost	Unrealized	Class	CUSIP
—	ATARA BIOTHERAPEUTICS	1,063,189	$44,197	14.7%	$36.04	—	COM	046513107
—	EPIZYME	1,580,400	$29,680	9.9%	$18.78	—	COM	29428V104
—	RECEPTOS	151,301	$24,948	8.3%	$124.05	—	COM	756207106
—	ARRAY BIOPHARMA SR CONV NT 3.000% Due 06/01/2020	17,500,000	$21,973	7.3%	$0.93	—	NOTE	04269XAA3
—	ASSEMBLY BIOSCIENCES	1,574,107	$20,841	6.9%	$9.79	—	COM	045396108
—	CLOVIS ONCOLOGY	2,500	$18,558	6.2%	—	—	Put	189464950
—	CLOVIS ONCOLOGY	243,048	$18,041	6.0%	$56.00	—	COM	189464100
—	KITE PHARMA	281,400	$16,231	5.4%	$57.67	—	COM	49803L109
—	FLEX PHARMA	805,691	$15,792	5.3%	$19.60	—	COM	33938A105
IRWD	IRONWOOD PHARMACEUTICALS CL A	900,000	$14,400	4.8%	$11.44	+14.6%	COM CL A	46333X108
—	FIBROGEN	400,000	$12,552	4.2%	$27.34	—	COM	31572Q808
—	RETROPHIN	410,000	$9,824	3.3%	$23.96	—	COM	761299106
—	KINDRED BIOSCIENCES	1,294,431	$9,242	3.1%	$7.45	—	COM	494577109
IRWD	IRONWOOD PHARMACEUTICALS CL A	5,000	$8,000	2.7%	$11.44	+14.6%	Call	46333X108
—	GENVEC	1,986,413	$5,860	2.0%	$2.08	—	COM	37246C307
—	SAGE THERAPEUTICS INC	112,455	$5,649	1.9%	$18.47	—	COM	78667J108
—	ARRAY BIOPHARMA	7,350	$5,417	1.8%	—	—	Call	04269X105
—	CALITHERA BIOSCIENCES	295,480	$4,852	1.6%	$19.00	—	COM	13089P101
—	FORWARD PHARMA A/S SPONSORED ADR	158,985	$4,502	1.5%	$23.61	—	SPONSORED ADR	34986J105
XENE	XENON PHARMACEUTICALS	220,570	$3,720	1.2%	$14.68	+25.8%	COM	98420N105
—	FLEXION THERAPEUTICS	162,900	$3,669	1.2%	$22.52	—	COM	33938J106
—	TARGACEPT	619,699	$1,841	0.6%	$2.63	—	COM	87611R306
—	EPIZYME	150	$282	0.1%	—	—	Call	29428V904