Rock Springs Capital Management LP Q1 2019 Filing

Filed May 15, 2019

Portfolio Value

$2.6B

Holdings

131

Report Date

Q1 2019

Filing Type

13F-HR

All Holdings (131 positions)

#	Stock	Shares	Value	% Portfolio
101	INSM 1.75 01/15/25INSMED INC	6,000,000	$6.1M	0.23%
102	RYTMRHYTHM PHARMACEUTICALS INC	216,500	$5.9M	0.23%
103	—MOMENTA PHARMACEUTICALS INC	400,000	$5.8M	0.22%
104	ELVANTHEM INC	20,000	$5.7M	0.22%
105	BCRXBIOCRYST PHARMACEUTICALS	700,000	$5.7M	0.22%
106	ARDXARDELYX INC	2,000,000	$5.6M	0.22%
107	MGNXMACROGENICS INC	300,000	$5.4M	0.21%
108	—ALDER BIOPHARMACEUTICALS INC	5,000,000	$4.8M	0.18%
109	CGENCOMPUGEN LTD	1,100,000	$4.6M	0.18%
110	—MEDICINES CO	5,000,000	$4.2M	0.16%
111	—NABRIVA THERAPEUTICS PLC	1,600,000	$3.9M	0.15%
112	—CORREVIO PHARMA CORP	1,200,000	$3.8M	0.15%
113	ADAPYADAPTIMMUNE THERAPEUTICS PLC	800,000	$3.4M	0.13%
114	—CHIASMA INC	650,000	$3.4M	0.13%
115	—MEDICINES CO	3,000,000	$3.0M	0.12%
116	DVAXDYNAVAX TECHNOLOGIES CORP	380,000	$2.8M	0.11%
117	—RESTORBIO INC	400,000	$2.7M	0.11%
118	—PARATEK PHARMACEUTICALS INC	450,000	$2.4M	0.09%
119	ARVNARVINAS INC	150,000	$2.2M	0.09%
120	NVROEURNEVRO CORP	34,700	$2.2M	0.08%
121	NVAXNOVAVAX INC	3,250,000	$1.8M	0.07%
122	—LA JOLLA PHARMACEUTICAL CO	277,236	$1.8M	0.07%
123	CRVSCORVUS PHARMACEUTICALS INC	400,000	$1.6M	0.06%
124	—THERAVANCE BIOPHARMA INC	1,500,000	$1.5M	0.06%
125	KLDOKALEIDO BIOSCIENCES INC	100,050	$1.5M	0.06%
126	NBIX 2.25 05/15/24NEUROCRINE BIOSCIENCES INC	1,000,000	$1.4M	0.05%
127	—RADIUS HEALTH INC	1,500,000	$1.2M	0.05%
128	—PACIRA PHARMACEUTICALS INC	1,000,000	$987K	0.04%
129	—DERMIRA INC	1,000,000	$888K	0.03%
130	SLDBSOLID BIOSCIENCES INC	60,000	$552K	0.02%
131	—PROTEOSTASIS THERAPEUTICS IN	400,000	$504K	0.02%

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