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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 (2015Q4)
Portfolio Summary: 120 holdings with a total value of $1,319,729,000.
#
Name
Shares
Value ($)
%
Options
Notes
51 NOVAVAX INC COM 770,000 6,460,000 0.49%
52 COHERUS BIOSCIENCES INC COM 282,000 6,475,000 0.49%
53 TANDEM DIABETES CARE INC COM 562,500 6,643,000 0.50%
54 MACROGENICS INC 218,000 6,751,000 0.51%
55 HEALTHSOUTH CORP 195,000 6,788,000 0.51%
56 NOVADAQ TECHNOLOGIES INC 540,000 6,880,000 0.52%
57 RELYPSA INC 252,000 7,142,000 0.54%
58 BIOMARIN PHARMACEUTICAL INC 70,000 7,333,000 0.56%
59 RTI SURGICAL HOLDINGS INC COM 1,860,000 7,384,000 0.56%
60 Intersect ENT Inc 337,293 7,589,000 0.58%
61 INSMED INC 432,500 7,850,000 0.59%
62 GW PHARMACEUTICALS PLC 116,000 8,055,000 0.61%
63 Heartware International, Inc. 160,669 8,098,000 0.61%
64 INOVALON HLDGS INC COM CL A 477,300 8,114,000 0.61%
65 PORTOLA PHARMACEUTICALS INC 165,000 8,489,000 0.64%
66 VALEANT PHARMACEUTICALS INTL 83,700 8,508,000 0.64%
67 SERES THERAPEUTICS INC 245,400 8,611,000 0.65%
68 JUNO THERAPEUTICS INC COM 197,001 8,662,000 0.66%
69 Anacor Pharmaceuticals Inc 77,000 8,699,000 0.66%
70 VERTEX PHARMACEUTICALS INC 72,750 9,154,000 0.69%
71 ADAPTIMMUNE THERAPEUTICS PLC 765,001 9,226,000 0.70%
72 IDEXX LAB 127,500 9,297,000 0.70%
73 CHIASMA INC 487,500 9,540,000 0.72%
74 CARDIOME PHARMA CORP 1,190,000 9,651,000 0.73%
75 INTRA-CELLULAR THERAPIES INC 180,000 9,682,000 0.73%
76 INSYS THERAPEUTICS INC NEW COM NEW 338,500 9,691,000 0.73%
77 DERMIRA INC COM 290,000 10,037,000 0.76%
78 Theravance Biopharma Inc 645,000 10,572,000 0.80%
79 Wright Medical Group NV 456,000 11,026,000 0.84%
80 PENUMBRA INC COM 205,000 11,031,000 0.84%
81 JAZZ PHARMACEUTICALS PLC 80,300 11,287,000 0.86%
82 PRA HEALTH SCIENCES INC 253,000 11,453,000 0.87%
83 ADURO BIOTECH INC 415,000 11,678,000 0.88%
84 ULTRAGENYX PHARMACEUTICAL INC COM 105,500 11,835,000 0.90%
85 ACHILLION PHARMACEUTICALS IN 1,105,000 11,923,000 0.90%
86 THERAPEUTICSMD INC 1,185,000 12,288,000 0.93%
87 ARDELYX INC COM 682,500 12,367,000 0.94%
88 RETROPHIN INC 675,000 13,021,000 0.99%
89 AMGEN INC 80,900 13,132,000 1.00%
90 GALAPAGOS NV 210,000 13,205,000 1.00%
91 INCYTE CORP 127,000 13,773,000 1.04%
92 MEDNAX INC 193,000 13,830,000 1.05%
93 THERMO FISHER SCIENTIFIC INC 100,000 14,185,000 1.07%
94 MCKESSON CORP 72,500 14,299,000 1.08%
95 BIOGEN INC 50,650 15,517,000 1.18%
96 WELLCARE HEALTH PLANS INC 214,500 16,776,000 1.27%
97 ANTHEM INC 120,800 16,844,000 1.28%
98 PROTHENA CORP PLC 248,000 16,891,000 1.28%
99 TESARO INCORPORATED 334,000 17,475,000 1.32%
100 CIGNA CORPORATION 122,000 17,852,000 1.35%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-16-002886, filed 2016.02.16).

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.