0001085146-18-001995.txt : 20180813 0001085146-18-001995.hdr.sgml : 20180813 20180813104305 ACCESSION NUMBER: 0001085146-18-001995 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20180630 FILED AS OF DATE: 20180813 DATE AS OF CHANGE: 20180813 EFFECTIVENESS DATE: 20180813 FILER: COMPANY DATA: COMPANY CONFORMED NAME: WESTFIELD CAPITAL MANAGEMENT CO LP CENTRAL INDEX KEY: 0001177719 IRS NUMBER: 800175963 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-10220 FILM NUMBER: 181010767 BUSINESS ADDRESS: STREET 1: ONE FINANCIAL CENTER STREET 2: 23RD FLOOR CITY: BOSTON STATE: MA ZIP: 02111 BUSINESS PHONE: 6174287100 MAIL ADDRESS: STREET 1: ONE FINANCIAL CENTER STREET 2: 23RD FLOOR CITY: BOSTON STATE: MA ZIP: 02111 FORMER COMPANY: FORMER CONFORMED NAME: WESTFIELD CAPITAL MANAGEMENT CO LLC DATE OF NAME CHANGE: 20020717 13F-HR 1 primary_doc.xml 13F-HR LIVE false true false 0001177719 XXXXXXXX 06-30-2018 06-30-2018 false WESTFIELD CAPITAL MANAGEMENT CO LP

ONE FINANCIAL CENTER 23RD FLOOR BOSTON MA 02111

13F HOLDINGS REPORT 028-10220 N Brandi McMahon 617-428-7100 /s/ Brandi McMahon Boston MA 08-13-2018 0 243 13396173 INFORMATION TABLE 2 form13fInfoTable.xml DESCRIPTION FOR INFORMATION TABLE ABBOTT LABS COM 002824100 8687 142430 SH SOLE 78935 0 63495 ACACIA COMMUNICATIONS INC COM 00401C108 13289 381765 SH SOLE 192005 0 189760 ACCELERON PHARMA INC COM 00434H108 38575 795043 SH SOLE 523896 0 271147 ACLARIS THERAPEUTICS INC COM 00461U105 14990 750604 SH SOLE 398533 0 352071 ADOBE SYS INC COM 00724F101 127436 522685 SH SOLE 396231 0 126454 ADVANCED ENERGY INDS COM 007973100 22706 390873 SH SOLE 198263 0 192610 ALEXANDRIA REAL ESTATE EQ IN COM 015271109 41145 326110 SH SOLE 229435 0 96675 ALEXION PHARMACEUTICALS INC COM 015351109 29372 236585 SH SOLE 161155 0 75430 ALIBABA GROUP HLDG LTD SPONSORED ADS 01609W102 57053 307511 SH SOLE 215254 0 92257 ALLIANCE DATA SYSTEMS CORP COM 018581108 781 3350 SH SOLE 3350 0 0 ALNYLAM PHARMACEUTICALS INC COM 02043Q107 22470 228140 SH SOLE 171460 0 56680 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