0001172661-17-002054.txt : 20171114 0001172661-17-002054.hdr.sgml : 20171114 20171114091711 ACCESSION NUMBER: 0001172661-17-002054 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20170930 FILED AS OF DATE: 20171114 DATE AS OF CHANGE: 20171114 EFFECTIVENESS DATE: 20171114 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: 171198703 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 09-30-2017 09-30-2017 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 11-14-2017 0 147 2167567 INFORMATION TABLE 2 infotable.xml ACADIA HEALTHCARE COMPANY IN COM 00404A109 62327 1305000 SH SOLE 1305000 0 0 ACADIA PHARMACEUTICALS INC COM 004225108 6856 182000 SH SOLE 182000 0 0 ACHILLION PHARMACEUTICALS IN COM 00448Q201 9570 2131400 SH SOLE 2131400 0 0 ACLARIS THERAPEUTICS INC COM 00461U105 11356 440000 SH SOLE 440000 0 0 ADAPTIMMUNE THERAPEUTICS PLC SPONDS ADR 00653A107 7166 875000 SH SOLE 875000 0 0 ADURO BIOTECH INC COM 00739L101 4420 415000 SH SOLE 415000 0 0 ADVANCED ACCELERATOR APPLIC SPONSORED ADS 00790T100 53048 784500 SH SOLE 784500 0 0 AEGLEA BIOTHERAPEUTICS INC COM 00773J103 2584 524089 SH SOLE 524089 0 0 AETNA INC NEW COM 00817Y108 63445 399000 SH SOLE 399000 0 0 AIMMUNE THERAPEUTICS INC COM 00900T107 7263 293000 SH SOLE 293000 0 0 ALDER BIOPHARMACEUTICALS INC COM 014339105 10719 875000 SH SOLE 875000 0 0 ALEXION PHARMACEUTICALS INC COM 015351109 64954 463000 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