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Institutional Investment Manager
Rock Springs Capital Management LP
Rock Springs Capital Management LP (CIK: 0001595725) incorporated in Delaware, located at 650 South Exeter Street, Baltimore, MD. Institutional holdings reported to the SEC.

Institutional Holdings (2016Q1)
Portfolio Summary: 128 holdings with a total value of $1,193,502,000.
#
Name
Shares
Value ($)
%
Options
Notes
51 XENOPORT INC 1,100,000 4,961,000 0.42%
52 Ascendis Pharma 270,000 5,009,000 0.42%
53 AMICUS THERAPEUTICS INC COM 613,500 5,184,000 0.43%
54 INTRA-CELLULAR THERAPIES INC 187,500 5,213,000 0.44%
55 ADURO BIOTECH INC 415,000 5,316,000 0.45%
56 CHINA CORD BLOOD CORP 880,000 5,342,000 0.45%
57 ENVISION HEALTHCARE HLDGS INC 266,000 5,426,000 0.45%
58 INSMED INC 450,000 5,702,000 0.48%
59 INSYS THERAPEUTICS INC NEW COM NEW 365,500 5,844,000 0.49%
60 FIVE PRIME THERAPEUTICS INC 144,500 5,871,000 0.49%
61 REGENERON PHARMACEUTICALS 16,500 5,947,000 0.50%
62 COHERUS BIOSCIENCES INC COM 282,000 5,987,000 0.50%
63 DERMIRA INC COM 290,000 5,997,000 0.50%
64 Heartware International, Inc. 193,000 6,064,000 0.51%
65 NOVADAQ TECHNOLOGIES INC 555,000 6,155,000 0.52%
66 ADAPTIMMUNE THERAPEUTICS PLC 765,001 6,219,000 0.52%
67 ATHENA HEALTH INC. 45,750 6,349,000 0.53%
68 Intersect ENT Inc 340,000 6,460,000 0.54%
69 BEIGENE LTD 225,000 6,595,000 0.55%
70 CORVUS PHARMACEUTICALS INC COM 456,887 6,625,000 0.56%
71 ALKERMES PLC 194,500 6,650,000 0.56%
72 VERTEX PHARMACEUTICALS INC 83,900 6,669,000 0.56%
73 EDWARDS LIFESCIENCES CORP 76,000 6,704,000 0.56%
74 SERES THERAPEUTICS INC 262,000 6,959,000 0.58%
75 RETROPHIN INC 521,400 7,122,000 0.60%
76 EPIZYME INC COM 589,000 7,139,000 0.60%
77 COOPER COS INC 47,600 7,329,000 0.61%
78 RTI SURGICAL HOLDINGS INC COM 1,860,000 7,440,000 0.62%
79 ULTRAGENYX PHARMACEUTICAL INC COM 118,500 7,502,000 0.63%
80 JUNO THERAPEUTICS INC COM 197,001 7,504,000 0.63%
81 INVITAE CORP 752,500 7,698,000 0.64%
82 HEALTHSOUTH CORP 208,000 7,827,000 0.66%
83 INOVALON HLDGS INC COM CL A 427,300 7,914,000 0.66%
84 Wright Medical Group NV 490,000 8,134,000 0.68%
85 ARDELYX INC COM 1,060,400 8,239,000 0.69%
86 BIOMARIN PHARMACEUTICAL INC 103,250 8,516,000 0.71%
87 GALAPAGOS NV 210,000 8,782,000 0.74%
88 ACHILLION PHARMACEUTICALS IN 1,220,000 9,418,000 0.79%
89 INCYTE CORP 130,500 9,457,000 0.79%
90 Anacor Pharmaceuticals Inc 177,500 9,487,000 0.79%
91 THERAPEUTICSMD INC 1,575,000 10,080,000 0.84%
92 WALGREENS BOOTS ALLIANCE INC 123,500 10,404,000 0.87%
93 PENUMBRA INC COM 228,500 10,511,000 0.88%
94 GW PHARMACEUTICALS PLC 147,000 10,606,000 0.89%
95 PRA HEALTH SCIENCES INC 253,000 10,818,000 0.91%
96 BRISTOL MYERS SQUIBB CO 170,000 10,860,000 0.91%
97 JAZZ PHARMACEUTICALS PLC 85,500 11,162,000 0.94%
98 MCKESSON CORP 77,500 12,187,000 1.02%
99 Theravance Biopharma Inc 650,500 12,229,000 1.02%
100 MEDNAX INC 195,000 12,601,000 1.06%
Page 2 of 3

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-16-003409, filed 2016.05.16).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.