0001085146-20-001482.txt : 20200514 0001085146-20-001482.hdr.sgml : 20200514 20200514100101 ACCESSION NUMBER: 0001085146-20-001482 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20200331 FILED AS OF DATE: 20200514 DATE AS OF CHANGE: 20200514 EFFECTIVENESS DATE: 20200514 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: 20875695 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 false false 0001177719 XXXXXXXX 03-31-2020 03-31-2020 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 05-13-2020 0 216 11354045 INFORMATION TABLE 2 form13fInfoTable.xml DESCRIPTION FOR INFORMATION TABLE 8X8 INC NEW COM 282914100 37227 2685919 SH SOLE 2266480 0 419439 ABBOTT LABS COM 002824100 10270 130150 SH SOLE 75885 0 54265 ACADIA PHARMACEUTICALS INC COM 004225108 21543 509885 SH SOLE 476365 0 33520 ACCELERON PHARMA INC COM 00434H108 57999 645364 SH SOLE 548514 0 96850 ACI WORLDWIDE INC COM 004498101 14422 597192 SH SOLE 560042 0 37150 ADVANCED DRAIN SYS INC DEL COM 00790R104 18870 640975 SH SOLE 603275 0 37700 ADVANCED ENERGY INDS COM 007973100 19072 393324 SH SOLE 368779 0 24545 ALEXANDRIA REAL ESTATE EQ IN COM 015271109 109397 798170 SH SOLE 598555 0 199615 ALIBABA GROUP HLDG LTD SPONSORED ADS 01609W102 14375 73913 SH SOLE 73913 0 0 ALNYLAM PHARMACEUTICALS INC COM 02043Q107 15094 138664 SH SOLE 106634 0 32030 ALPHABET INC CAP STK CL C 02079K107 4720 4059 SH SOLE 3657 0 402 ALPHABET INC CAP 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