0001172661-16-003409.txt : 20160516 0001172661-16-003409.hdr.sgml : 20160516 20160516125408 ACCESSION NUMBER: 0001172661-16-003409 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20160331 FILED AS OF DATE: 20160516 DATE AS OF CHANGE: 20160516 EFFECTIVENESS DATE: 20160516 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: 161652248 BUSINESS ADDRESS: STREET 1: 650 SOUTH EXETER STREET CITY: BALTIMORE STATE: MD ZIP: 21202 BUSINESS PHONE: 4102200129 MAIL ADDRESS: STREET 1: 650 SOUTH EXETER STREET CITY: BALTIMORE STATE: MD ZIP: 21202 13F-HR 1 primary_doc.xml 13F-HR LIVE false true false 0001595725 XXXXXXXX 03-31-2016 03-31-2016 false Rock Springs Capital Management LP

650 South Exeter Street Baltimore MD 21202

13F HOLDINGS REPORT 028-16048 N Evans Apeadu 410-220-0129 /s/ Evans Apeadu Baltimore MD 05-16-2016 0 128 1193502 INFORMATION TABLE 2 infotable.xml ACADIA HEALTHCARE COMPANY IN COM 00404A109 41305 749500 SH SOLE 749500 0 0 ACHILLION PHARMACEUTICALS IN COM 00448Q201 9418 1220000 SH SOLE 1220000 0 0 ACLARIS THERAPEUTICS INC COM 00461U105 16970 895500 SH SOLE 895500 0 0 ADAPTIMMUNE THERAPEUTICS PLC SPONDS ADR 00653A107 6219 765001 SH SOLE 765001 0 0 ADURO BIOTECH INC COM 00739L101 5316 415000 SH SOLE 415000 0 0 ADVANCED ACCELERATOR APPLIC SPONSORED ADS 00790T100 29172 833000 SH SOLE 833000 0 0 AETNA INC NEW COM 00817Y108 46176 411000 SH SOLE 411000 0 0 AIMMUNE THERAPEUTICS INC COM 00900T107 3973 293000 SH SOLE 293000 0 0 ALDER BIOPHARMACEUTICALS INC COM 014339105 2388 97500 SH SOLE 97500 0 0 ALEXION PHARMACEUTICALS INC COM 015351109 31707 227750 SH SOLE 227750 0 0 ALKERMES PLC SHS G01767105 6650 194500 SH SOLE 194500 0 0 ALLERGAN PLC SHS G0177J108 45833 171000 SH SOLE 171000 0 0 ALLERGAN 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