Rock Springs Capital Management 13F-HR Quarterly holdings report by institutional manager

The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE

OMB APPROVAL

OMB Number:		3235-0006
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COLUMN 1	COLUMN 2	COLUMN 3	COLUMN 4	COLUMN 5			COLUMN 6	COLUMN 7	COLUMN 8
			VALUE	SHRS OR	SH/	PUT/	INVESTMENT	OTHER	VOTING AUTHORITY
NAME OF ISSUER	TITLE OF CLASS	CUSIP	(x$1000)	PRN AMT	PRN	CALL	DISCRETION	MANAGER	SOLE	SHARED	NONE
ACADIA HEALTHCARE COMPANY IN	COM	00404A109	45,818	924,678	SH		SOLE		924,678	0	0
ACHILLION PHARMACEUTICALS IN	COM	00448Q201	10,660	1,316,000	SH		SOLE		1,316,000	0	0
ACLARIS THERAPEUTICS INC	COM	00461U105	26,020	1,016,000	SH		SOLE		1,016,000	0	0
ADAPTIMMUNE THERAPEUTICS PLC	SPONDS ADR	00653A107	4,759	675,000	SH		SOLE		675,000	0	0
ADURO BIOTECH INC	COM	00739L101	5,158	415,000	SH		SOLE		415,000	0	0
ADVANCED ACCELERATOR APPLIC	SPONSORED ADS	00790T100	35,414	930,000	SH		SOLE		930,000	0	0
AEGLEA BIOTHERAPEUTICS INC	COM	00773J103	3,359	524,089	SH		SOLE		524,089	0	0
AETNA INC NEW	COM	00817Y108	50,810	440,100	SH		SOLE		440,100	0	0
AIMMUNE THERAPEUTICS INC	COM	00900T107	4,395	293,000	SH		SOLE		293,000	0	0
ALDER BIOPHARMACEUTICALS INC	COM	014339105	5,964	182,000	SH		SOLE		182,000	0	0
ALEXION PHARMACEUTICALS INC	COM	015351109	32,749	267,250	SH		SOLE		267,250	0	0
ALKERMES PLC	SHS	G01767105	8,608	183,027	SH		SOLE		183,027	0	0
ALLERGAN PLC	SHS	G0177J108	42,838	186,000	SH		SOLE		186,000	0	0
ALLERGAN PLC	PFD CONV SER A	G0177J116	4,106	5,000	SH		SOLE		5,000	0	0
AMARIN CORP PLC	SPONS ADR NEW	023111206	15,809	4,955,746	SH		SOLE		4,955,746	0	0
AMGEN INC	COM	031162100	15,680	94,000	SH		SOLE		94,000	0	0
AMICUS THERAPEUTICS INC	COM	03152W109	5,143	695,000	SH		SOLE		695,000	0	0
AMSURG CORP	COM	03232P405	2,179	32,500	SH		SOLE		32,500	0	0
ANTHERA PHARMACEUTICALS INC	COM NEW	03674U201	1,418	450,000	SH		SOLE		450,000	0	0
ARDELYX INC	COM	039697107	25,557	1,975,000	SH		SOLE		1,975,000	0	0
ARIAD PHARMACEUTICALS INC	COM	04033A100	342	25,000	SH		SOLE		25,000	0	0
ASCENDIS PHARMA A S	SPONSORED ADR	04351P101	6,030	300,000	SH		SOLE		300,000	0	0
ASSEMBLY BIOSCIENCES INC	COM	045396108	2,812	390,000	SH		SOLE		390,000	0	0
ATHENAHEALTH INC	COM	04685W103	5,770	45,750	SH		SOLE		45,750	0	0
ATYR PHARMA INC	COM	002120103	1,379	433,500	SH		SOLE		433,500	0	0
AUDENTES THERAPEUTICS INC	COM	05070R104	8,638	485,000	SH		SOLE		485,000	0	0
AVEXIS INC	COM	05366U100	5,769	140,000	SH		SOLE		140,000	0	0
BEIGENE LTD	SPONSORED ADR	07725L102	6,932	225,000	SH		SOLE		225,000	0	0
BIOGEN INC	COM	09062X103	18,156	58,000	SH		SOLE		58,000	0	0
BIOMARIN PHARMACEUTICAL INC	COM	09061G101	11,565	125,000	SH		SOLE		125,000	0	0
BIOSCRIP INC	COM	09069N108	4,308	1,490,492	SH		SOLE		1,490,492	0	0
BLUEBIRD BIO INC	COM	09609G100	1,356	20,000	SH		SOLE		20,000	0	0
BRISTOL MYERS SQUIBB CO	COM	110122108	13,480	250,000	SH		SOLE		250,000	0	0
CARDIOME PHARMA CORP	COM NO PAR	14159U301	3,751	1,200,000	SH		SOLE		1,200,000	0	0
CELGENE CORP	COM	151020104	26,603	254,500	SH		SOLE		254,500	0	0
CERNER CORP	COM	156782104	1,235	20,000	SH		SOLE		20,000	0	0
CERULEAN PHARMA INC	COM	15708Q105	654	625,000	SH		SOLE		625,000	0	0
CHIASMA INC	COM	16706W102	1,448	492,500	SH		SOLE		492,500	0	0
CHINA CORD BLOOD CORP	SHS	G21107100	4,497	880,000	SH		SOLE		880,000	0	0
CIDARA THERAPEUTICS INC	COM	171757107	2,863	250,000	SH		SOLE		250,000	0	0
CIGNA CORPORATION	COM	125509109	29,778	228,500	SH		SOLE		228,500	0	0
CLEARSIDE BIOMEDICAL INC	COM	185063104	21,254	1,225,000	SH		SOLE		1,225,000	0	0
CLOVIS ONCOLOGY INC	COM	189464100	4,506	125,000	SH		SOLE		125,000	0	0
COHERUS BIOSCIENCES INC	COM	19249H103	12,520	467,500	SH		SOLE		467,500	0	0
COLLEGIUM PHARMACEUTICAL INC	COM	19459J104	29,757	1,545,000	SH		SOLE		1,545,000	0	0
COMPUGEN LTD	ORD	M25722105	5,198	825,000	SH		SOLE		825,000	0	0
CORVUS PHARMACEUTICALS INC	COM	221015100	7,403	450,000	SH		SOLE		450,000	0	0
DANAHER CORP DEL	COM	235851102	12,542	160,000	SH		SOLE		160,000	0	0
DBV TECHNOLOGIES S A	SPONSORED ADR	23306J101	2,652	73,000	SH		SOLE		73,000	0	0
DERMIRA INC	COM	24983L104	12,006	355,000	SH		SOLE		355,000	0	0
DIMENSION THERAPEUTICS INC	COM	25433V105	2,168	271,370	SH		SOLE		271,370	0	0
DYNAVAX TECHNOLOGIES CORP	COM NEW	268158201	1,731	165,000	SH		SOLE		165,000	0	0
EDWARDS LIFESCIENCES CORP	COM	28176E108	12,448	103,250	SH		SOLE		103,250	0	0
EGALET CORP	COM	28226B104	2,283	300,000	SH		SOLE		300,000	0	0
EGALET CORP	NOTE 5.500% 4/0	28226BAB0	6,684	7,800,000	PRN		SOLE		7,800,000	0	0
ENDOCHOICE HLDGS INC	COM	29272U103	5,766	722,500	SH		SOLE		722,500	0	0
ENVISION HEALTHCARE HLDGS IN	COM	29413U103	6,481	291,000	SH		SOLE		291,000	0	0
EPIZYME INC	COM	29428V104	6,322	642,500	SH		SOLE		642,500	0	0
EXACT SCIENCES CORP	COM	30063P105	8,078	435,000	SH		SOLE		435,000	0	0
EXELIXIS INC	COM	30161Q104	1,599	125,000	SH		SOLE		125,000	0	0
FIBROGEN INC	COM	31572Q808	4,833	233,500	SH		SOLE		233,500	0	0
FIVE PRIME THERAPEUTICS INC	COM	33830X104	8,726	166,250	SH		SOLE		166,250	0	0
GALAPAGOS NV	SPON ADR	36315X101	13,579	210,000	SH		SOLE		210,000	0	0
GENOCEA BIOSCIENCES INC	COM	372427104	2,458	480,000	SH		SOLE		480,000	0	0
GILEAD SCIENCES INC	COM	375558103	27,217	344,000	SH		SOLE		344,000	0	0
GLOBAL BLOOD THERAPEUTICS IN	COM	37890U108	2,259	98,000	SH		SOLE		98,000	0	0
GW PHARMACEUTICALS PLC	ADS	36197T103	43,137	325,000	SH		SOLE		325,000	0	0
HCA HOLDINGS INC	COM	40412C101	32,521	430,000	SH		SOLE		430,000	0	0
HEALTHSOUTH CORP	COM NEW	421924309	10,751	265,000	SH		SOLE		265,000	0	0
HILL ROM HLDGS INC	COM	431475102	7,438	120,000	SH		SOLE		120,000	0	0
HOLOGIC INC	COM	436440101	9,805	252,500	SH		SOLE		252,500	0	0
INCYTE CORP	COM	45337C102	14,756	156,500	SH		SOLE		156,500	0	0
INFINITY PHARMACEUTICALS INC	COM	45665G303	421	270,000	SH		SOLE		270,000	0	0
INNOVIVA INC	COM	45781M101	3,703	336,900	SH		SOLE		336,900	0	0
INSMED INC	COM PAR $.01	457669307	7,304	503,000	SH		SOLE		503,000	0	0
INSYS THERAPEUTICS INC NEW	COM NEW	45824V209	1,179	100,000	SH		SOLE		100,000	0	0
INTERSECT ENT INC	COM	46071F103	5,465	345,000	SH		SOLE		345,000	0	0
INTRA CELLULAR THERAPIES INC	COM	46116X101	2,896	190,000	SH		SOLE		190,000	0	0
INTUITIVE SURGICAL INC	COM NEW	46120E602	32,617	45,000	SH		SOLE		45,000	0	0
INVITAE CORP	COM	46185L103	7,796	890,000	SH		SOLE		890,000	0	0
JAZZ PHARMACEUTICALS PLC	SHS USD	G50871105	12,998	107,000	SH		SOLE		107,000	0	0
JUNO THERAPEUTICS INC	COM	48205A109	5,912	197,001	SH		SOLE		197,001	0	0
KITE PHARMA INC	COM	49803L109	4,413	79,000	SH		SOLE		79,000	0	0
LIGAND PHARMACEUTICALS INC	COM NEW	53220K504	6,634	65,000	SH		SOLE		65,000	0	0
LILLY ELI & CO	COM	532457108	22,152	276,000	SH		SOLE		276,000	0	0
MACROGENICS INC	COM	556099109	6,730	225,000	SH		SOLE		225,000	0	0
MADRIGAL PHARMACEUTICALS INC	COM	558868105	799	63,000	SH		SOLE		63,000	0	0
MCKESSON CORP	COM	58155Q103	13,674	82,000	SH		SOLE		82,000	0	0
MEDICINES CO	COM	584688105	25,701	681,000	SH		SOLE		681,000	0	0
MEDICINES CO	NOTE 2.500% 1/1	584688AE5	3,898	3,000,000	PRN		SOLE		3,000,000	0	0
MEDNAX INC	COM	58502B106	3,313	50,000	SH		SOLE		50,000	0	0
MEDPACE HLDGS INC	COM	58506Q109	4,031	135,000	SH		SOLE		135,000	0	0
MERCK & CO INC	COM	58933Y105	36,666	587,500	SH		SOLE		587,500	0	0
MERUS N V	COM	N5749R100	6,415	383,000	SH		SOLE		383,000	0	0
NABRIVA THERAPEUTICS AG	SPONSORED ADR	62957M104	3,003	426,000	SH		SOLE		426,000	0	0
NEUROCRINE BIOSCIENCES INC	COM	64125C109	20,762	410,000	SH		SOLE		410,000	0	0
NIVALIS THERAPEUTICS INC	COM	65481J109	3,976	489,000	SH		SOLE		489,000	0	0
NOVADAQ TECHNOLOGIES INC	COM	66987G102	6,421	555,000	SH		SOLE		555,000	0	0
NOVAVAX INC	COM	670002104	1,773	852,500	SH		SOLE		852,500	0	0
NOVOCURE LTD	ORD SHS	G6674U108	1,830	214,316	SH		SOLE		214,316	0	0
OPHTHOTECH CORP	COM	683745103	6,827	148,000	SH		SOLE		148,000	0	0
OREXIGEN THERAPEUTICS INC	COM NEW	686164302	549	165,300	SH		SOLE		165,300	0	0
OTONOMY INC	COM	68906L105	3,820	210,000	SH		SOLE		210,000	0	0
PACIRA PHARMACEUTICALS INC	COM	695127100	17,247	504,000	SH		SOLE		504,000	0	0
PARATEK PHARMACEUTICALS INC	COM	699374302	6,538	502,500	SH		SOLE		502,500	0	0
PATHEON N V	SHS	N6865W105	11,852	400,000	SH		SOLE		400,000	0	0
PENUMBRA INC	COM	70975L107	20,251	266,500	SH		SOLE		266,500	0	0
PERRIGO CO PLC	SHS	G97822103	3,499	37,900	SH		SOLE		37,900	0	0
PFIZER INC	COM	717081103	35,760	1,055,800	SH		SOLE		1,055,800	0	0
PRA HEALTH SCIENCES INC	COM	69354M108	14,297	253,000	SH		SOLE		253,000	0	0
PROTEOSTASIS THERAPEUTICS IN	COM	74373B109	7,016	450,000	SH		SOLE		450,000	0	0
PROTHENA CORP PLC	SHS	G72800108	18,471	308,000	SH		SOLE		308,000	0	0
PUMA BIOTECHNOLOGY INC	COM	74587V107	4,660	69,500	SH		SOLE		69,500	0	0
RADIUS HEALTH INC	COM NEW	750469207	48,248	892,000	SH		SOLE		892,000	0	0
REGENERON PHARMACEUTICALS	COM	75886F107	6,834	17,000	SH		SOLE		17,000	0	0
RETROPHIN INC	COM	761299106	11,682	522,000	SH		SOLE		522,000	0	0
RIGEL PHARMACEUTICALS INC	COM NEW	766559603	6,643	1,810,000	SH		SOLE		1,810,000	0	0
RTI SURGICAL INC	COM	74975N105	5,822	1,860,000	SH		SOLE		1,860,000	0	0
SAREPTA THERAPEUTICS INC	COM	803607100	10,624	173,000	SH		SOLE		173,000	0	0
SCYNEXIS INC	COM	811292101	2,457	635,000	SH		SOLE		635,000	0	0
SERES THERAPEUTICS INC	COM	81750R102	2,704	220,000	SH		SOLE		220,000	0	0
SHIRE PLC	SPONSORED ADR	82481R106	25,686	132,500	SH		SOLE		132,500	0	0
SPARK THERAPEUTICS INC	COM	84652J103	37,538	625,000	SH		SOLE		625,000	0	0
STERIS PLC	SHS USD	G84720104	2,924	40,000	SH		SOLE		40,000	0	0
TANDEM DIABETES CARE INC	COM	875372104	4,558	595,000	SH		SOLE		595,000	0	0
TESARO INC	COM	881569107	62,800	626,500	SH		SOLE		626,500	0	0
TETRAPHASE PHARMACEUTICALS I	COM	88165N105	2,537	662,500	SH		SOLE		662,500	0	0
THERAPEUTICSMD INC	COM	88338N107	12,258	1,800,000	SH		SOLE		1,800,000	0	0
THERAVANCE BIOPHARMA INC	COM	G8807B106	21,744	600,000	SH		SOLE		600,000	0	0
ULTRAGENYX PHARMACEUTICAL IN	COM	90400D108	10,428	147,000	SH		SOLE		147,000	0	0
VALEANT PHARMACEUTICALS INTL	COM	91911K102	1,684	68,600	SH		SOLE		68,600	0	0
VERTEX PHARMACEUTICALS INC	COM	92532F100	7,827	89,750	SH		SOLE		89,750	0	0
WALGREENS BOOTS ALLIANCE INC	COM	931427108	12,980	161,000	SH		SOLE		161,000	0	0
WELLCARE HEALTH PLANS INC	COM	94946T106	27,458	234,500	SH		SOLE		234,500	0	0
WILLIS TOWERS WATSON PUB LTD	SHS	G96629103	7,767	58,500	SH		SOLE		58,500	0	0
WRIGHT MED GROUP INC	NOTE 2.000% 2/1	98235TAE7	1,073	1,000,000	PRN		SOLE		1,000,000	0	0
WRIGHT MED GROUP N V	ORD SHS 0.03 PAR	N96617118	15,037	613,000	SH		SOLE		613,000	0	0