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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 (2015Q2)
Portfolio Summary: 117 holdings with a total value of $1,369,933,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 ABBVIE INC 746,423 50,152,000 3.66%
2 MEDTRONIC PLC 570,000 42,237,000 3.08%
3 VALEANT PHARMACEUTICALS INTL 189,250 42,042,000 3.07%
4 ACADIA HEALTHCARE COMPANY IN 511,750 40,085,000 2.93%
5 HCA HOLDINGS INC 422,500 38,329,000 2.80%
6 ALLERGAN PLC 121,500 36,870,000 2.69%
7 MCKESSON CORP 149,500 33,609,000 2.45%
8 SPARK THERAPEUTICS INC 508,059 30,621,000 2.24%
9 GILEAD SCIENCES INC 257,500 30,148,000 2.20%
10 RADIUS HEALTH 429,000 29,043,000 2.12%
11 ALEXION PHARMACEUTIC 154,500 27,929,000 2.04%
12 PFIZER INC 760,000 25,483,000 1.86%
13 HUMANA 131,500 25,153,000 1.84%
14 AMGEN INC 156,000 23,949,000 1.75%
15 THORATEC LABS CORP 532,500 23,734,000 1.73%
16 CELGENE CORP 198,000 22,916,000 1.67%
17 ENVISION HEALTHCARE HLDGS INC 570,000 22,504,000 1.64%
18 RETROPHIN INC COM 675,000 22,376,000 1.63%
19 TEAM HEALTH HOLDINGS INCORPORATED 312,500 20,416,000 1.49%
20 AETNA INC NEW 156,500 19,947,000 1.46%
21 CIGNA CORPORATION 122,000 19,764,000 1.44%
22 LILLY ELI & CO 232,500 19,411,000 1.42%
23 NEUROCRINE BIOSCIE COM USD0.001 376,000 17,958,000 1.31%
24 CVS HEALTH CORP 164,000 17,200,000 1.26%
25 ADAPTIMMUNE THERAPEUTICS PLC 905,000 16,589,000 1.21%
26 WRIGHT MEDICAL GROUP N.V. 660,000 16,493,000 1.20%
27 INTUITIVE SURGICAL INC 33,000 15,989,000 1.17%
28 INOVALON HLDGS INC COM CL A 560,000 15,624,000 1.14%
29 BIOGEN INC 38,650 15,612,000 1.14%
30 COHERUS BIOSCIENCES INC COM 534,000 15,433,000 1.13%
31 Adeptus Health Inc 150,000 14,249,000 1.04%
32 COLLEGIUM PHARMACEUTICAL INC COM 754,600 13,462,000 0.98%
33 PROTHENA CORP PLC 250,000 13,168,000 0.96%
34 THERMO FISHER SCIENTIFIC INC 100,000 12,976,000 0.95%
35 Receptos Inc 68,250 12,971,000 0.95%
36 TESARO INC 217,000 12,757,000 0.93%
37 RTI SURGICAL HOLDINGS INC COM 1,860,000 12,016,000 0.88%
38 HealthSouth Corp 257,500 11,860,000 0.87%
39 INCYTE 113,000 11,776,000 0.86%
40 Heartware International, Inc. 162,000 11,776,000 0.86%
41 ADURO BIOTECH 350,000 10,616,000 0.77%
42 JUNO THERAPEUTICS INCORPORATED 197,000 10,506,000 0.77%
43 KYTHERA BIOPHARMACEUTICALS I 139,250 10,487,000 0.77%
44 PRA HEALTH SCIENCES INC 285,000 10,354,000 0.76%
45 MEDICINES CO 345,500 9,885,000 0.72%
46 ACHILLION PHARMACEUTICALS INC COM 1,100,000 9,746,000 0.71%
47 ARDELYX INC COM 610,000 9,742,000 0.71%
48 DAVITA INC 122,050 9,699,000 0.71%
49 COOPER COS INC 54,000 9,610,000 0.70%
50 ULTRAGENYX PHARMACEUTICAL INC COM 92,000 9,420,000 0.69%
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Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001172661-15-001627, filed 2015.08.14).

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.