0001172661-26-002225.txt : 20260515 0001172661-26-002225.hdr.sgml : 20260515 20260515133358 ACCESSION NUMBER: 0001172661-26-002225 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20260331 FILED AS OF DATE: 20260515 DATE AS OF CHANGE: 20260515 EFFECTIVENESS DATE: 20260515 FILER: COMPANY DATA: COMPANY CONFORMED NAME: Rock Springs Capital Management LP CENTRAL INDEX KEY: 0001595725 ORGANIZATION NAME: EIN: 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: 26985320 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 X0202 13F-HR LIVE false true false 0001595725 XXXXXXXX 03-31-2026 03-31-2026 false Rock Springs Capital Management LP

650 South Exeter Street Suite 1070 Baltimore MD 21202

13F HOLDINGS REPORT 028-16048 000168648 801-78511 N Nnamdi Etoh 410-220-0129 /s/ Nnamdi Etoh Baltimore MD 05-15-2026 0 100 1696654121 INFORMATION TABLE 2 infotable.xml ACADIA HEALTHCARE COMPANY IN COM 00404A109 1765945 75500 SH SOLE 75500 0 0 ACLARIS THERAPEUTICS INC COM 00461U105 16772438 4472650 SH SOLE 4472650 0 0 AGILON HEALTH INC COM NEW 00857U206 2056600 260000 SH SOLE 260000 0 0 AGIOS PHARMACEUTICALS INC COM 00847X104 27035684 799163 SH SOLE 799163 0 0 ALKERMES PLC SHS G01767105 6505745 183986 SH SOLE 183986 0 0 ALNYLAM PHARMACEUTICALS INC COM 02043Q107 24484380 74000 SH SOLE 74000 0 0 ALPHATEC HLDGS INC COM NEW 02081G201 3808000 350000 SH SOLE 350000 0 0 AMICUS THERAPEUTIC COM 03152W109 304557 21062 SH SOLE 21062 0 0 AMYLYX PHARMACEUTICALS INC COM 03237H101 6946720 499764 SH SOLE 499764 0 0 APELLIS PHARMACEUTICALS INC COM 03753U106 6547433 162750 SH SOLE 162750 0 0 ARCELLX INC COMMON STOCK 03940C100 19503210 169859 SH SOLE 169859 0 0 ARCUS BIOSCIENCES INC COM 03969F109 3888000 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