0001172661-18-000619.txt : 20180214 0001172661-18-000619.hdr.sgml : 20180214 20180214093307 ACCESSION NUMBER: 0001172661-18-000619 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20171231 FILED AS OF DATE: 20180214 DATE AS OF CHANGE: 20180214 EFFECTIVENESS DATE: 20180214 FILER: COMPANY DATA: COMPANY CONFORMED NAME: Rock Springs Capital Management LP CENTRAL INDEX KEY: 0001595725 IRS NUMBER: 800944416 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-16048 FILM NUMBER: 18607874 BUSINESS ADDRESS: STREET 1: 650 SOUTH EXETER STREET STREET 2: SUITE 1070 CITY: BALTIMORE STATE: MD ZIP: 21202 BUSINESS PHONE: 4102200129 MAIL ADDRESS: STREET 1: 650 SOUTH EXETER STREET STREET 2: SUITE 1070 CITY: BALTIMORE STATE: MD ZIP: 21202 13F-HR 1 primary_doc.xml 13F-HR LIVE false true false 0001595725 XXXXXXXX 12-31-2017 12-31-2017 false Rock Springs Capital Management LP

650 South Exeter Street Suite 1070 Baltimore MD 21202

13F HOLDINGS REPORT 028-16048 N Eric Brody 410-220-0541 /s/ Eric Brody Baltimore MD 02-14-2018 0 145 2203927 INFORMATION TABLE 2 infotable.xml ABLYNX NV SPONSORED ADR 00372Y105 6248 250000 SH SOLE 250000 0 0 ACADIA HEALTHCARE COMPANY IN COM 00404A109 40902 1253500 SH SOLE 1253500 0 0 ACHILLION PHARMACEUTICALS IN COM 00448Q201 6480 2250000 SH SOLE 2250000 0 0 ACLARIS THERAPEUTICS INC COM 00461U105 10234 415000 SH SOLE 415000 0 0 ADAPTIMMUNE THERAPEUTICS PLC SPONDS ADR 00653A107 5845 875000 SH SOLE 875000 0 0 ADURO BIOTECH INC COM 00739L101 3113 415000 SH SOLE 415000 0 0 ADVANCED ACCELERATOR APPLIC SPONSORED ADS 00790T100 67377 825500 SH SOLE 825500 0 0 AEGLEA BIOTHERAPEUTICS INC COM 00773J103 2835 524089 SH SOLE 524089 0 0 AETNA INC NEW COM 00817Y108 43113 239000 SH SOLE 239000 0 0 AIMMUNE THERAPEUTICS INC COM 00900T107 11081 293000 SH SOLE 293000 0 0 ALDER BIOPHARMACEUTICALS INC COM 014339105 12080 1055000 SH SOLE 1055000 0 0 ALEXION PHARMACEUTICALS INC COM 015351109 57403 480000 SH 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