0001085146-17-001209.txt : 20170512 0001085146-17-001209.hdr.sgml : 20170512 20170512080627 ACCESSION NUMBER: 0001085146-17-001209 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20170331 FILED AS OF DATE: 20170512 DATE AS OF CHANGE: 20170512 EFFECTIVENESS DATE: 20170512 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: 17836458 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 03-31-2017 03-31-2017 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 05-11-2017 0 258 11648480 false INFORMATION TABLE 2 form13fInfoTable.xml DESCRIPTION FOR INFORMATION TABLE ABBOTT LABSCOM0028241001145282578881SHSOLE 22478630331018ACADIA PHARMACEUTICALS INCCOM0042251088206238694SHSOLE 1277640110930ACCELERON PHARMA INCCOM00434H108303851147919SHSOLE 7581890389730ACLARIS THERAPEUTICS INCCOM00461U10520740695502SHSOLE 3768500318652ACUSHNET HOLDINGS CORPCOM005098108189201094890SHSOLE 5871400507750ADOBE SYS INCCOM00724F101109304839959SHSOLE 7224990117460AFFILIATED MANAGERS GROUPCOM00825210822597137838SHSOLE 13570302135AGILENT TECHNOLOGIES INCCOM00846U1013336300SHSOLE 630000ALDER BIOPHARMACEUTICALS INCCOM0143391058265397350SHSOLE 2130600184290ALEXION PHARMACEUTICALS INCCOM01535110943551359212SHSOLE 297756061456ALKERMES PLCSHSG0176710521830373170SHSOLE 282915090255ALLEGIANT TRAVEL COCOM01748X10239635247331SHSOLE 188988058343ALLIANCE DATA SYSTEMS CORPCOM01858110852142209407SHSOLE 20684502562ALPHABET INCCAP STK CL C02079K107165355199329SHSOLE 175563023766ALPHABET INCCAP STK CL A02079K305168490198738SHSOLE 175037023701AMAZON COM INCCOM023135106197213222453SHSOLE 195219027234AMETEK INC NEWCOM0311001001444322670710SHSOLE 23909270279783APPLE INCCOM0378331003176412211060SHSOLE 19377260273334APPLIED MATLS INCCOM038222105738061897319SHSOLE 16265090270810ARRIS INTL INCSHSG0551A10320693782334SHSOLE 4356600346674AUTONATION INCCOM05329W10216876399045SHSOLE 39242506620AVERY DENNISON CORPCOM05361110951499638946SHSOLE 544696094250AXALTA COATING SYS LTDCOMG0750C108510491585375SHSOLE 12020750383300BAKER HUGHES INCCOM05722410729863499210SHSOLE 49473004480BANK OF NT BUTTERFIELD&SON LSHS NEWG0772R20822661710155SHSOLE 3821550328000BAXTER INTL INCCOM071813109211340745SHSOLE 4074500BERRY PLASTICS GROUP INCCOM08579W103688811418175SHSOLE 10304000387775BEST BUY INCCOM0865161017223146965SHSOLE 81425065540BIOGEN INCCOM09062X10398187359107SHSOLE 313329045778BIOMARIN PHARMACEUTICAL INCCOM09061G10123174264005SHSOLE 25963004375BIOVERATIV INCCOM09075E10023354428834SHSOLE 362194066640BMC STK HLDGS INCCOM05591B109236291045550SHSOLE 5580200487530BRIGHT HORIZONS FAM SOL IN DCOM10919410038549531787SHSOLE 3054370226350BRISTOL MYERS SQUIBB COCOM110122108625891150962SHSOLE 10086250142337BROADCOM LTDSHSY0982710994246430427SHSOLE 356110074317BROADSOFT INCCOM11133B40932262802544SHSOLE 4475250355019BRUNSWICK CORPCOM11704310926575434226SHSOLE 2307370203489BUILDERS FIRSTSOURCE INCCOM12008R107420802824169SHSOLE 21410100683159CARDIOME PHARMA CORPCOM NO PAR14159U301147344894948SHSOLE 263760302257345CAVIUM INCCOM14964U10849869695915SHSOLE 4988900197025CELANESE CORP DELCOM SER A150870103987101098611SHSOLE 9569010141710CELGENE CORPCOM1510201041746161403327SHSOLE 12376850165642CHARTER COMMUNICATIONS INC NCL A16119P108115072351558SHSOLE 307457044101CHEMTURA CORPCOM NEW163893209142742730SHSOLE 4273000CHUBB LIMITEDCOMH1467J104206315140SHSOLE 1314002000CHUYS HLDGS INCCOM17160410114355481709SHSOLE 2584100223299CIENA CORPCOM NEW171779309608712578180SHSOLE 19388500639330CISCO SYS INCCOM17275R1029048267695SHSOLE 1464300121265CLOVIS ONCOLOGY INCCOM18946410023910375530SHSOLE 293530082000CME GROUP INCCOM12572Q10591517770348SHSOLE 6529630117385CNO FINL GROUP INCCOM12621E1035801282995SHSOLE 214615068380COGNIZANT TECHNOLOGY SOLUTIOCL A19244610256072942064SHSOLE 7805340161530COLUMBIA PPTY TR INCCOM NEW19828720318822845920SHSOLE 4451700400750COMCAST CORP NEWCL A20030N10113850368440SHSOLE 2422360126204COMMUNITY HEALTHCARE TR INCCOM20369C10610875455027SHSOLE 2408050214222COMMVAULT SYSTEMS INCCOM20416610219308380069SHSOLE 2037280176341CONSTELLATION BRANDS INCCL A21036P108132757819134SHSOLE 729460089674CONTRAFECT CORPCOM212326102269149600SHSOLE 14960000COOPER COS INCCOM NEW21664840292334461923SHSOLE 401147060776COSTAR GROUP INCCOM22160N10964084309258SHSOLE 2064820102776CRANE COCOM22439910537147496420SHSOLE 3764000120020CROWN CASTLE INTL CORP NEWCOM22822V10118341194183SHSOLE 162222031961CSX CORPCOM12640810369815000SHSOLE 1500000CYBERARK SOFTWARE LTDSHSM2682V10823359459190SHSOLE 369725089465CYPRESS SEMICONDUCTOR CORPCOM232806109188211367790SHSOLE 10352300332560CYRUSONE INCCOM23283R100570391108192SHSOLE 9384320169760DANA INCORPORATEDCOM235825205275571427106SHSOLE 10821760344930DANAHER CORP DELCOM2358511021031421205916SHSOLE 10451110160805DAVE & BUSTERS ENTMT INCCOM23833710922307365153SHSOLE 2101130155040DELPHI AUTOMOTIVE PLCSHSG278231061001731244543SHSOLE 10557780188765DEXCOM INCCOM25213110755273652341SHSOLE 4263210226020DISNEY WALT COCOM DISNEY2546871061430871261897SHSOLE 11095490152348DOW CHEM COCOM2605431031381862174787SHSOLE 18821190292668DUNKIN BRANDS GROUP INCCOM26550410031773581064SHSOLE 4419440139120EAST WEST BANCORP INCCOM27579R10444717866439SHSOLE 6079390258500ELDORADO RESORTS INCCOM28470R102288021521901SHSOLE 8409250680976ELECTRONICS FOR IMAGING INCCOM28608210238573789935SHSOLE 4362550353680ESSENT GROUP LTDCOMG3198U10227573762310SHSOLE 5780300184280EURONET WORLDWIDE INCCOM29873610910952128060SHSOLE 68735059325EXPEDIA INC DELCOM NEW30212P30317770140840SHSOLE 13840502435FACEBOOK INCCL A30303M1022257771589416SHSOLE 13769680212448FCB FINL HLDGS INCCL A30255G10332777661497SHSOLE 4078730253624FIDELITY NATL INFORMATION SVCOM31620M10624017301640SHSOLE 29660005040FIRST REP BK SAN FRANCISCO CCOM33616C10039423420247SHSOLE 321187099060FLOWSERVE CORPCOM34354P10531878658358SHSOLE 5101380148220FORTINET INCCOM34959E109547011426358SHSOLE 9496710476687FOUR CORNERS PPTY TR INCCOM35086T1099438413420SHSOLE 2188200194600FREEPORT-MCMORAN INCCL B35671D85733425000SHSOLE 2500000GALLAGHER ARTHUR J & COCOM363576109568401005308SHSOLE 8303380174970GARTNER INCCOM36665110722469208065SHSOLE 158255049810GENERAL ELECTRIC COCOM369604103731362454221SHSOLE 21488260305395GENESCO INCCOM37153210212465224802SHSOLE 1204220104380GILEAD SCIENCES INCCOM375558103308845465SHSOLE 4009505370GRACE W R & CO DEL NEWCOM38388F10838839557155SHSOLE 4260550131100HAIN CELESTIAL GROUP INCCOM40521710019871534171SHSOLE 4066910127480HD SUPPLY HLDGS INCCOM40416M105630411532909SHSOLE 12834090249500HENRY JACK & ASSOC INCCOM426281101841490379SHSOLE 49437040942HEXCEL CORP NEWCOM42829110826021477010SHSOLE 2868200190190HILL ROM HLDGS INCCOM43147510268577971350SHSOLE 959400011950HUDSON TECHNOLOGIES INCCOM44414410926440000SHSOLE 4000000HUNT J B TRANS SVCS INCCOM44565810767200732503SHSOLE 6324780100025ICON PLCSHSG4705A10075156942754SHSOLE 6724650270289IHS MARKIT LTDSHSG47567105643981535117SHSOLE 13241630210954INPHI CORPCOM45772F107180336930SHSOLE 3693000INSTALLED BLDG PRODS INCCOM45780R101659251249756SHSOLE 8922740357482INTEGRA LIFESCIENCES HLDGS CCOM NEW45798520828801683625SHSOLE 3757950307830INTEGRATED DEVICE TECHNOLOGYCOM45811810613457568505SHSOLE 3035350264970INTEL CORPCOM4581401005723158657SHSOLE 88267070390INTERCONTINENTAL EXCHANGE INCOM45866F104740771237295SHSOLE 10129720224323INTERNATIONAL BUSINESS MACHSCOM4592001013482000SHSOLE 200000INTERXION HOLDING N.VSHSN4727910926825678085SHSOLE 3563950321690INTL PAPER COCOM460146103325364065SHSOLE 35245028820IPG PHOTONICS CORPCOM44980X109979781165SHSOLE 61985019180IROBOT CORPCOM46272610010671161338SHSOLE 86285075053ISLE OF CAPRI CASINOS INCCOM46459210416960643389SHSOLE 3416910301698JAZZ PHARMACEUTICALS PLCSHS USDG508711051998751377214SHSOLE 11927410184473JOHN BEAN TECHNOLOGIES CORPCOM47783910445101512802SHSOLE 2749120237890JPMORGAN CHASE & COCOM46625H100805891740SHSOLE 50150041590KATE SPADE & COCOM485865109288851243450SHSOLE 9431600300290KELLOGG COCOM48783610841118566292SHSOLE 55988706405KIMBERLY CLARK CORPCOM494368103543341277SHSOLE 22396018881KIRBY CORPCOM497266106117016590SHSOLE 1659000KLX INCCOM48253910344213989110SHSOLE 6499580339152KNOLL INCCOM NEW49890420016610697620SHSOLE 5288400168780LA JOLLA PHARMACEUTICAL COCOM PAR $.0001 25034596048008268290SHSOLE 1431800125110LAM RESEARCH CORPCOM51280710814715114635SHSOLE 11272501910LENNOX 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INCCOM57060D10820895111446SHSOLE 62931048515MARRIOTT INTL INC NEWCL A5719032021754861863301SHSOLE 16227340240567MARTEN TRANS LTDCOM57307510811868506089SHSOLE 3063450199744MASIMO CORPCOM57479510037576402920SHSOLE 2163480186572MASTERCARD INCORPORATEDCL A57636Q10472399643716SHSOLE 5332860110430MATSON INCCOM57686G10514022441500SHSOLE 2476800193820MCDONALDS CORPCOM580135101116259896992SHSOLE 7661670130825MEDICINES COCOM5846881059487194000SHSOLE 119540074460MERCK & CO INCCOM58933Y105575390534SHSOLE 53863036671METTLER TOLEDO INTERNATIONALCOM592688105111904233664SHSOLE 207994025670MGIC INVT CORP WISCOM552848103216232134600SHSOLE 11432600991340MGM RESORTS INTERNATIONALCOM55295310122229811280SHSOLE 797650013630MICROCHIP TECHNOLOGY INCCOM595017104420256955SHSOLE 31435025520MICRON TECHNOLOGY INCCOM59511210316250562270SHSOLE 55289009380MICROSEMI CORPCOM59513710047342918736SHSOLE 6217860296950MICROSOFT CORPCOM5949181041984983013932SHSOLE 25715340442398MIDDLEBY CORPCOM59627810173296537165SHSOLE 459520077645MONOLITHIC PWR SYS INCCOM60983910526896292031SHSOLE 1566220135409MONSTER BEVERAGE CORP NEWCOM61174X10940417875395SHSOLE 7254600149935MOTOROLA SOLUTIONS INCCOM NEW620076307535762130SHSOLE 34420027710MSCI INCCOM55354G10051883533829SHSOLE 458364075465MUELLER WTR PRODS INCCOM SER A624758108206331745582SHSOLE 9599120785670MULTI COLOR CORPCOM625383104146620641SHSOLE 1179408847NATIONAL STORAGE AFFILIATESCOM SHS BEN IN63787010617867747577SHSOLE 3948140352763NATURAL GROCERS BY VITAMIN CCOM63888U1086762650855SHSOLE 3532380297617NEKTAR THERAPEUTICSCOM640268108945974030539SHSOLE 287026601160273NETFLIX INCCOM64110L1063402300SHSOLE 230000NEUROCRINE BIOSCIENCES INCCOM64125C109513311185483SHSOLE 7746580410825NEWELL BRANDS INCCOM6512291061465653107171SHSOLE 27890200318151NEXSTAR MEDIA GROUP INCCL A65336K103748401066853SHSOLE 7059790360874NICE LTDSPONSORED ADR65365610840892601536SHSOLE 4755860125950NIELSEN HLDGS PLCSHS EURG6518L108552711337947SHSOLE 10834530254494NIKE INCCL B654106103559391003753SHSOLE 8753900128363NORD ANGLIA EDUCATION INCSHSG6583A10219570772295SHSOLE 5858950186400NXP SEMICONDUCTORS N VCOMN6596X10912323119066SHSOLE 11715601910O REILLY AUTOMOTIVE INC NEWCOM67103H10728402105256SHSOLE 10351301743OLD DOMINION FGHT LINES INCCOM67958010033719394052SHSOLE 298832095220OMNICELL INCCOM68213N10937611925244SHSOLE 4950800430164ON SEMICONDUCTOR CORPCOM682189105642564148230SHSOLE 35067200641510ORBOTECH LTDORDM7525310023899741042SHSOLE 3897200351322ORION ENGINEERED CARBONS S ACOML729671094462217665SHSOLE 1174150100250PACIFIC PREMIER BANCORPCOM69478X10517676458532SHSOLE 2457180212814PACIRA PHARMACEUTICALS INCCOM695127100733631608847SHSOLE 11321630476684PALO ALTO NETWORKS INCCOM69743510515614138569SHSOLE 13452904040PARAGON COML CORPCOM NEW69911U4033696900SHSOLE 690000PAYPAL HLDGS INCCOM70450Y103872392027866SHSOLE 17696740258192PENSKE AUTOMOTIVE GRP INCCOM70959W1035791123705SHSOLE 67595056110PINNACLE FOODS INC DELCOM72348P104599411035779SHSOLE 8872190148560PRA HEALTH SCIENCES INCCOM69354M1084506900SHSOLE 690000PRICELINE GRP INCCOM NEW7415034036913438840SHSOLE 3212106719PROGRESSIVE CORP OHIOCOM743315103419191069907SHSOLE 8866470183260PROOFPOINT INCCOM74342410325359341034SHSOLE 1825450158489PROTHENA CORP PLCSHSG7280010813345239194SHSOLE 1366840102510PTC INCCOM69370C10039783757046SHSOLE 5739660183080PVH CORPCOM69365610019896192290SHSOLE 18983502455QUEST DIAGNOSTICS INCCOM74834L10047066479334SHSOLE 3516540127680RAYMOND JAMES FINANCIAL INCCOM75473010939137513209SHSOLE 3956940117515REALPAGE INCCOM75606N10923867683878SHSOLE 5185080165370RED HAT INCCOM75657710254693632286SHSOLE 62467607610RUSH ENTERPRISES INCCL A78184620920206610826SHSOLE 3426800268146RYDER SYS INCCOM78354910856013742483SHSOLE 5098430232640S&P GLOBAL INCCOM78409V10487138666502SHSOLE 573366093136SABRE CORPCOM78573M10495244940SHSOLE 4494000SALESFORCE COM INCCOM79466L3021576061910607SHSOLE 16642850246322SCHLUMBERGER LTDCOM8068571086588424SHSOLE 842400SCHWAB CHARLES CORP NEWCOM8085131051029912523667SHSOLE 21999770323690SCRIPPS NETWORKS INTERACT INCL A COM81106510161952790510SHSOLE 6765350113975SEALED AIR CORP NEWCOM81211K100521551196755SHSOLE 10033850193370SEATTLE GENETICS INCCOM8125781027057112260SHSOLE 85130027130SENIOR HSG PPTYS TRSH BEN INT81721M10917114845150SHSOLE 6408100204340SERVICENOW INCCOM81762P1021198841370574SHSOLE 12239550146619SIX FLAGS ENTMT CORP NEWCOM83001A10258337980622SHSOLE 8221430158479SMITH A OCOM83186520933876662162SHSOLE 5019420160220SOTHEBYSCOM83589810724330534965SHSOLE 4056250129340SPDR GOLD TRUSTGOLD SHS78463V1074994200SHSOLE 420000SPIRIT AIRLS INCCOM84857710231097585955SHSOLE 3141250271830SPLUNK INCCOM84863710447990770427SHSOLE 6476570122770STAG INDL INCCOM85254J102381921526473SHSOLE 13546380171835STATE STR CORPCOM8574771033063840SHSOLE 003840STERIS PLCSHS USDG847201041661142391501SHSOLE 20294650362036SUMMIT MATLS INCCL A86614U100350561418683SHSOLE 10756220343061SUN CMNTYS INCCOM86667410422289277469SHSOLE 210169067300SVB FINL GROUPCOM78486Q10121505115560SHSOLE 11366501895TABLEAU SOFTWARE INCCL A87336U10520042404484SHSOLE 2169140187570TE CONNECTIVITY LTDREG SHSH8498910416710224140SHSOLE 21949004650TESARO INCCOM881569107850355263SHSOLE 28258027005TESORO CORPCOM88160910159987740032SHSOLE 6165970123435THERMO FISHER SCIENTIFIC INCCOM883556102471130671SHSOLE 2601504656TOTAL SYS SVCS INCCOM89190610947129881578SHSOLE 6816080199970TRANSDIGM GROUP INCCOM89364110071649325439SHSOLE 291429034010TRANSUNIONCOM89400J107688421795092SHSOLE 15240520271040TWENTY FIRST CENTY FOX INCCL A90130A101890732750026SHSOLE 22866010463425ULTA BEAUTY INCCOM90384S3031841664566SHSOLE 6349701069ULTIMATE SOFTWARE GROUP INCCOM90385D10722384114666SHSOLE 67060047606UNION PAC CORPCOM90781810862391589037SHSOLE 4876040101433UNITED CONTL HLDGS INCCOM9100471091101971559981SHSOLE 13793020180679UNITED PARCEL SERVICE INCCL B911312106101065941891SHSOLE 8285010113390UNITEDHEALTH GROUP INCCOM91324P102127163775335SHSOLE 6371040138231UNIVAR INCCOM91336L10723365762059SHSOLE 4086190353440VAIL RESORTS INCCOM91879Q109121459632930SHSOLE 4543110178619VALERO ENERGY CORP NEWCOM91913Y10041760629966SHSOLE 5218260108140VANTIV INCCL A92210H10544057687110SHSOLE 67840008710VENTAS INCCOM92276F1003074719SHSOLE 471900VERIZON COMMUNICATIONS INCCOM92343V1047989163885SHSOLE 103185060700VERTEX PHARMACEUTICALS INCCOM92532F10038915355880SHSOLE 35226503615VIACOM INC NEWCL B92553P20131317671750SHSOLE 600690071060VISA INCCOM CL A92826C8391845772076936SHSOLE 17994990277437VULCAN MATLS COCOM92916010927201225770SHSOLE 22233503435WASTE CONNECTIONS INCCOM94106B101129014625SHSOLE 1462500WATSCO INCCOM94262220038933271917SHSOLE 1460520125865WESTERN ALLIANCE BANCORPCOM95763810920557418760SHSOLE 41187006890WESTERN DIGITAL CORPCOM958102105626775930SHSOLE 41900034030WESTERN REFNG INCCOM95931910428288806620SHSOLE 4304700376150WNS HOLDINGS LTDSPON ADR92932M10121119738180SHSOLE 3951950342985WRIGHT MED GROUP N VORD SHS 0.03 PARN96617118663442131879SHSOLE 14300870701792ZAYO GROUP HLDGS INCCOM98919V105337641026260SHSOLE 7761700250090ZENDESK INCCOM98936J101289271031640SHSOLE 5783910453249