0001085146-18-001406.txt : 20180514 0001085146-18-001406.hdr.sgml : 20180514 20180514124441 ACCESSION NUMBER: 0001085146-18-001406 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20180331 FILED AS OF DATE: 20180514 DATE AS OF CHANGE: 20180514 EFFECTIVENESS DATE: 20180514 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: 18829579 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 03-31-2018 03-31-2018 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 05-14-2018 0 248 12975453 false INFORMATION TABLE 2 form13fInfoTable.xml DESCRIPTION FOR INFORMATION TABLE 8X8 INC NEWCOM2829141009493509020SHSOLE 2637000245320ABBOTT LABSCOM0028241001052701756838SHSOLE 13195260437312ACCELERON PHARMA INCCOM00434H108537311374198SHSOLE 8863680487830ACLARIS THERAPEUTICS INCCOM00461U10512446710369SHSOLE 3886980321671ACTIVISION BLIZZARD INCCOM00507V1094727000SHSOLE 700000ADOBE SYS INCCOM00724F101138500640964SHSOLE 4796230161341ALEXANDRIA REAL ESTATE EQ INCOM01527110940845327050SHSOLE 230645096405ALEXION PHARMACEUTICALS INCCOM01535110926648239080SHSOLE 163390075690ALIBABA GROUP HLDG LTDSPONSORED ADS01609W10260597330155SHSOLE 253714076441ALLIANCE DATA SYSTEMS CORPCOM0185811087133350SHSOLE 335000ALPHABET INCCAP STK CL C02079K107201453195246SHSOLE 151554043692ALPHABET INCCAP STK CL A02079K305169609163535SHSOLE 126553036982AMAZON COM INCCOM023135106327924226570SHSOLE 174431052139AMERICAN EAGLE OUTFITTERS NECOM02553E106268831348875SHSOLE 7058350643040AMERICAN TOWER CORP NEWCOM03027X10051908357151SHSOLE 2510980106053AMETEK INC NEWCOM0311001001949132565657SHSOLE 19649110600746ANALOG DEVICES INCCOM03265410534400377485SHSOLE 2765650100920ANDEAVORCOM03349M1051154611148183SHSOLE 9188730229310APPLE INCCOM0378331003206901911372SHSOLE 14812580430114APPLIED MATLS INCCOM038222105789941420505SHSOLE 9953300425175APTIV PLCSHSG6095L10977122907637SHSOLE 6446620262975ARAMARKCOM03852U106561501419368SHSOLE 11847930234575ARCHER DANIELS MIDLAND COCOM039483102426298260SHSOLE 55860042400ARCOS DORADOS HOLDINGS INCSHS CLASS -A -G0457F1079510370SHSOLE 0010370AU OPTRONICS CORPSPONSORED ADR0022551077716900SHSOLE 0016900AUTODESK INCCOM05276910641539330780SHSOLE 243010087770AVERY DENNISON CORPCOM05361110985498804689SHSOLE 5895590215130AVEXIS INCCOM05366U10021603174810SHSOLE 113360061450AXALTA COATING SYS LTDCOMG0750C108488501618095SHSOLE 10008350617260BANK AMER CORPCOM060505104943123144783SHSOLE 24605610684222BANK OF NT BUTTERFIELD&SON LSHS NEWG0772R208501461117340SHSOLE 7053300412010BERRY GLOBAL GROUP INCCOM08579W103574511048193SHSOLE 6848530363340BIO RAD LABS INCCL A09057220762131248444SHSOLE 158404090040BIOGEN INCCOM09062X10382113299879SHSOLE 234555065324BLACK KNIGHT INCCOM09215C10532203683705SHSOLE 5148950168810BMC STK HLDGS INCCOM05591B10918981970892SHSOLE 5103300460562BOEING COCOM097023105152510465141SHSOLE 395844069297BOTTOMLINE TECH DEL INCCOM10138810621924565782SHSOLE 2964000269382BOYD GAMING CORPCOM103304101376761182545SHSOLE 8953250287220BRIGHT HORIZONS FAM SOL IN DCOM10919410026697267723SHSOLE 1583130109410BRINKER INTL INCCOM10964110028053777080SHSOLE 5850200192060BROADCOM LTDSHSY0982710992033390548SHSOLE 299714090834BUILDERS FIRSTSOURCE INCCOM12008R107334501685969SHSOLE 12699300416039BURLINGTON STORES INCCOM12201710637834284146SHSOLE 214006070140CAMDEN PPTY TRSH BEN INT13313110220052238200SHSOLE 1157500122450CANTEL MEDICAL CORPCOM13809810854007484760SHSOLE 2999920184768CARDIOME PHARMA CORPCOM NO PAR14159U30197264192034SHSOLE 215664502035389CARNIVAL CORPUNIT 99/99/9999143658300395860360SHSOLE 34410025950CATERPILLAR INC DELCOM149123101455730920SHSOLE 16945013975CELANESE CORP DELCOM SER A15087010398221980149SHSOLE 7090610271088CELGENE CORPCOM1510201041316081475259SHSOLE 11480740327185CHEGG INCCOM16309210915512750825SHSOLE 3934000357425CIENA CORPCOM NEW17177930922048851286SHSOLE 4476760403610CITIZENS FINL GROUP INCCOM1746101056625157820SHSOLE 89460068360CLOVIS ONCOLOGY INCCOM18946410029057550315SHSOLE 3308050219510CME GROUP INCCOM CL A12572Q10598779610726SHSOLE 4643090146417COGNIZANT TECHNOLOGY SOLUTIOCL A1924461021016961263307SHSOLE 9672870296020COHERENT INCCOM19247910327597147263SHSOLE 110896036367COMERICA INCCOM20034010764795675441SHSOLE 4753460200095COMMSCOPE HLDG CO INCCOM20337X10929335733920SHSOLE 5525800181340COMMVAULT SYSTEMS INCCOM20416610224229423587SHSOLE 2220960201491CONAGRA BRANDS INCCOM2058871026605179085SHSOLE 101475077610CONSTELLATION BRANDS INCCL A21036P108166119728850SHSOLE 5570070171843COOPER COS INCCOM NEW216648402162670710938SHSOLE 5270090183929COSTAR GROUP INCCOM22160N10995292262744SHSOLE 175520087224COSTCO WHSL CORP NEWCOM22160K10570796375714SHSOLE 2646600111054CRANE COCOM22439910538384413885SHSOLE 3117550102130CSX CORPCOM12640810383615000SHSOLE 1500000CUMMINS INCCOM231021106523632300SHSOLE 17870014430CYPRESS SEMICONDUCTOR CORPCOM232806109229421352740SHSOLE 9945700358170CYRUSONE INCCOM23283R10022114431838SHSOLE 3164080115430DANA INCORPORATEDCOM23582520521814846816SHSOLE 6378560208960DANAHER CORP DELCOM235851102405741435SHSOLE 3647804957DELPHI TECHNOLOGIES PLCSHSG2709G107776721630056SHSOLE 13285340301522DIAMONDBACK ENERGY INCCOM25278X10932427256300SHSOLE 192260064040DOLLAR TREE INCCOM25674610861001642790SHSOLE 5236430119147DOWDUPONT INCCOM26078J1001146951800273SHSOLE 13717360428537E TRADE FINANCIAL CORPCOM NEW26924640151001920435SHSOLE 7038550216580EAST WEST BANCORP INCCOM27579R10430190482735SHSOLE 3732350109500ELDORADO RESORTS INCCOM28470R102437651326214SHSOLE 7284890597725ENVISION HEALTHCARE CORPCOM29414D10035372920425SHSOLE 6817350238690EOG RES INCCOM26875P1011168261109779SHSOLE 8503820259397ESSENT GROUP LTDCOMG3198U102599791409279SHSOLE 11562490253030EXPEDIA GROUP INCCOM NEW30212P30324340220454SHSOLE 161825058629FACEBOOK INCCL A30303M1022618651638805SHSOLE 12639410374864FIDELITY NATL INFORMATION SVCOM31620M10653192552360SHSOLE 3933500159010FINANCIAL ENGINES INCCOM3174851005515157580SHSOLE 89340068240FLEETCOR TECHNOLOGIES INCCOM33904110568493338238SHSOLE 266884071354FLIR SYS INCCOM30244510135725714365SHSOLE 5380150176350FLOOR & DECOR HLDGS INCCL A33975010118999364515SHSOLE 274375090140FLOWSERVE CORPCOM34354P105609061405642SHSOLE 9387020466940FORTINET INCCOM34959E109712121329072SHSOLE 8842050444867FULLER H B COCOM35969410629632595855SHSOLE 3122750283580GALLAGHER ARTHUR J & COCOM363576109799721163573SHSOLE 8660230297550GARTNER INCCOM36665110728012238155SHSOLE 183535054620GRACE W R & CO DEL NEWCOM38388F10832524531185SHSOLE 4012250129960GREEN DOT CORPCL A39304D1029572149190SHSOLE 77270071920HAMILTON LANE INCCL A40749710610144272460SHSOLE 1411900131270HEICO CORP NEWCL A42280620820462288400SHSOLE 1481700140230HENRY JACK & ASSOC INCCOM426281101609850419SHSOLE 27862022557HILL ROM HLDGS INCCOM4314751023393900SHSOLE 390000HOME DEPOT INCCOM437076102160302899363SHSOLE 6900810209282HONEYWELL INTL INCCOM438516106475932935SHSOLE 18270014665HUNT J B TRANS SVCS INCCOM44565810792401788737SHSOLE 5906450198092ICON PLCSHSG4705A10063294535751SHSOLE 3418720193879IDEXX LABS INCCOM45168D10444844234307SHSOLE 180802053505IHS MARKIT LTDSHSG47567105646021339177SHSOLE 9924340346743ILLINOIS TOOL WKS INCCOM45230810996849618209SHSOLE 4700520148157INDUSTRIAL LOGISTICS PPTYS TCOM SHS BEN INT45623710617880879075SHSOLE 6612250217850INGERSOLL-RAND PLCSHSG477911011225561433234SHSOLE 10826600350574INSTALLED BLDG PRODS INCCOM45780R10137337621758SHSOLE 3463560275402INTEGRA LIFESCIENCES HLDGS CCOM NEW45798520841730754066SHSOLE 4063960347670INTEGRATED DEVICE TECHNOLOGYCOM45811810622678742075SHSOLE 4175650324510INTERNATIONAL BUSINESS MACHSCOM45920010178121509164SHSOLE 3905780118586INTERXION HOLDING N.VSHSN4727910926127420656SHSOLE 2199560200700JAZZ PHARMACEUTICALS PLCSHS USDG508711051817021203405SHSOLE 9121190291286JOHN BEAN TECHNOLOGIES CORPCOM47783910451369452991SHSOLE 2374610215530JOHNSON & JOHNSONCOM478160104523940879SHSOLE 23209017670JPMORGAN CHASE & COCOM46625H100746667890SHSOLE 37820030070KLX INCCOM48253910368166959270SHSOLE 6061480353122LAM RESEARCH CORPCOM51280710866202325862SHSOLE 267607058255LENNOX INTL INCCOM52610710794521462501SHSOLE 3471190115382LILLY ELI & COCOM5324571088446109170SHSOLE 73255035915LIONS GATE ENTMNT CORPCL A VTG53591940171827795SHSOLE 2779500LIONS GATE ENTMNT CORPCL B NON VTG535919500488672029344SHSOLE 12918120737532LITHIA MTRS INCCL A53679710317505174149SHSOLE 91239082910LIVE NATION ENTERTAINMENT INCOM538034109199547350SHSOLE 4735000LOCKHEED MARTIN CORPCOM539830109454813458SHSOLE 1345800LPL FINL HLDGS INCCOM50212V10043322709387SHSOLE 4755450233842LUMENTUM HLDGS INCCOM55024U10915473242531SHSOLE 182601059930MADISON SQUARE GARDEN CO NEWCL A55825T10332388131764SHSOLE 67524064240MARRIOTT INTL INC NEWCL A5719032021654121216443SHSOLE 9138500302593MARTEN TRANS LTDCOM573075108223898166SHSOLE 9816600MASIMO CORPCOM57479510057428652958SHSOLE 4216670231291MASTEC INCCOM57632310922598480290SHSOLE 3617400118550MASTERCARD INCORPORATEDCL A57636Q104102055582641SHSOLE 4080180174623MEDICINES COCOM584688105997953029611SHSOLE 22701510759460MERCK & CO INCCOM58933Y10566212159SHSOLE 1046801691MERCURY SYS INCCOM58937810825133520135SHSOLE 2881650231970METTLER TOLEDO INTERNATIONALCOM592688105104122181072SHSOLE 131589049483MGIC INVT CORP WISCOM552848103190291463780SHSOLE 7561250707655MGM RESORTS INTERNATIONALCOM552953101974912783870SHSOLE 19980840785786MICROCHIP TECHNOLOGY INCCOM59501710441218451160SHSOLE 3209750130185MICRON TECHNOLOGY INCCOM595112103583531119169SHSOLE 8569320262237MICROSEMI CORPCOM595137100213833030SHSOLE 3303000MICROSOFT CORPCOM5949181042363132589160SHSOLE 19946490594511MILACRON HLDGS CORPCOM59870L106359731786145SHSOLE 9361450850000MKS INSTRUMENT INCCOM55306N10417939155116SHSOLE 116406038710MONOLITHIC PWR SYS INCCOM60983910512322106434SHSOLE 55515050919MSCI INCCOM55354G10069321463778SHSOLE 3498950113883NATIONAL VISION HLDGS INCCOM63845R10711817365730SHSOLE 1961000169630NCR CORP NEWCOM62886E108318091009183SHSOLE 7598730249310NEKTAR THERAPEUTICSCOM6402681081077401013932SHSOLE 6441200369812NETAPP INCCOM64110D10421817353650SHSOLE 259090094560NEW RELIC INCCOM64829B10030883416666SHSOLE 3137960102870NEXSTAR MEDIA GROUP INCCL A65336K10342669641638SHSOLE 4029440238694NEXTERA ENERGY INCCOM65339F101406224870SHSOLE 1982005050NICE LTDSPONSORED ADR65365610858514622954SHSOLE 4162290206725NOVAGOLD RES INCCOM NEW66987E20622953000SHSOLE 5300000NOVOCURE LTDORD SHSG6674U1089942456035SHSOLE 2391450216890NVR INCCOM62944T10525290SHSOLE 9000OCCIDENTAL PETE CORP DELCOM674599105631597215SHSOLE 53710043505OLD DOMINION FGHT LINES INCCOM67958010025559173903SHSOLE 131033042870OMNICELL INCCOM68213N10925333583699SHSOLE 3061270277572ORBOTECH LTDORDM752531007965128094SHSOLE 66945061149ORION ENGINEERED CARBONS S ACOML72967109327591208815SHSOLE 9183850290430PACIFIC PREMIER BANCORPCOM69478X10528933719737SHSOLE 4000200319717PACIRA PHARMACEUTICALS INCCOM69512710025988834282SHSOLE 5512180283064PAGSEGURO DIGITAL LTDCOM CL AG687071012536600SHSOLE 660000PALO ALTO NETWORKS INCCOM69743510535966198139SHSOLE 151173046966PARTY CITY HOLDCO INCCOM702149105205931320060SHSOLE 6896200630440PAYPAL HLDGS INCCOM70450Y103888501171080SHSOLE 8344990336581PHILIP MORRIS INTL INCCOM7181721091044111050409SHSOLE 7927000257709PINNACLE FINL PARTNERS INCCOM72346Q10417562273545SHSOLE 1400250133520PINNACLE FOODS INC DELCOM72348P104771731426489SHSOLE 10545290371960PIONEER NAT RES COCOM72378710743955255880SHSOLE 176410079470PROGRESSIVE CORP OHIOCOM7433151031439232362109SHSOLE 16695830692526PROOFPOINT INCCOM74342410342615374970SHSOLE 1996510175319PROTHENA CORP PLCSHSG7280010811373309819SHSOLE 1726190137200PTC INCCOM69370C10027361350731SHSOLE 264141086590PVH CORPCOM69365610036248239370SHSOLE 176470062900QTS RLTY TR INCCOM CL A74736A10318282504745SHSOLE 3795150125230QUEST DIAGNOSTICS INCCOM74834L10038179380646SHSOLE 2763460104300RAYMOND JAMES FINANCIAL INCCOM75473010935009391554SHSOLE 303209088345REALPAGE INCCOM75606N10944183857913SHSOLE 6544030203510RED HAT INCCOM75657710271039475148SHSOLE 397203077945RESOLUTE ENERGY CORPCOM NEW76116A30612608363855SHSOLE 1922450171610ROBERT HALF INTL INCCOM77032310332860567625SHSOLE 4137950153830ROCKWELL AUTOMATION INCCOM77390310930106172825SHSOLE 126955045870ROYAL CARIBBEAN CRUISES LTDCOMV7780T103620052655SHSOLE 29845022810RSP PERMIAN INCCOM74978Q105785771676139SHSOLE 11641190512020RUSH ENTERPRISES INCCL A78184620933031777386SHSOLE 4310100346376RYDER SYS INCCOM78354910832060440450SHSOLE 2304800209970S&P GLOBAL INCCOM78409V10496363504360SHSOLE 3940290110331SALEM MEDIA GROUP INCCL A79409310418250600SHSOLE 5060000SALESFORCE COM INCCOM79466L3021497501287616SHSOLE 9718010315815SANTANDER CONSUMER USA HDG ICOM80283M10111493705100SHSOLE 3453200359780SBA COMMUNICATIONS CORP NEWCL A78410G1045303100SHSOLE 310000SCHLUMBERGER LTDCOM8068571083124824SHSOLE 482400SERVICENOW INCCOM81762P102150229908000SHSOLE 6935070214493SIX FLAGS ENTMT CORP NEWCOM83001A10246120740767SHSOLE 5579380182829SMITH A OCOM83186520935062551375SHSOLE 4152950136080SOTHEBYSCOM83589810722587440200SHSOLE 3316200108580SPDR SERIES TRUSTS&P REGL BKG78464A6985378900SHSOLE 890000SPLUNK INCCOM84863710467024681207SHSOLE 5120100169197STAG INDL INCCOM85254J10217059713168SHSOLE 3945140318654STERIS PLCSHS USDG847201041544481654326SHSOLE 12607730393553SUMMIT MATLS INCCL A86614U100896082959310SHSOLE 21803490778961SUN CMNTYS INCCOM86667410430162330104SHSOLE 248324081780TABLEAU SOFTWARE INCCL A87336U10529176361005SHSOLE 1952210165784TANDEM DIABETES CARE INCCOM NEW87537220337876300SHSOLE 7630000TELEDYNE TECHNOLOGIES INCCOM87936010586907464323SHSOLE 3539230110400TEXAS INSTRS INCCOM882508104798276830SHSOLE 42400034430TEXAS ROADHOUSE INCCOM88268110924656426723SHSOLE 2235800203143THERMO FISHER SCIENTIFIC INCCOM883556102617829923SHSOLE 2577704146TIFFANY & CO NEWCOM88654710836100369645SHSOLE 271385098260TOPBUILD CORPCOM89055F10347664622893SHSOLE 5162880106605TOTAL SYS SVCS INCCOM89190610964388746440SHSOLE 5758200170620TRANSDIGM GROUP INCCOM89364110076689249849SHSOLE 188685061164TRANSUNIONCOM89400J107712081254102SHSOLE 9316020322500TRINSEO S ASHSL9340P10131571426345SHSOLE 2227850203560ULTIMATE SOFTWARE GROUP INCCOM90385D10731974131201SHSOLE 73837057364ULTRA CLEAN HLDGS INCCOM90385V10715508805616SHSOLE 4216960383920UNION PAC CORPCOM9078181081461431087131SHSOLE 8382980248833UNITED CONTL HLDGS INCCOM9100471091033051487045SHSOLE 11358200351225UNITEDHEALTH GROUP INCCOM91324P102152388712092SHSOLE 5486130163479UNIVAR INCCOM91336L107474591710245SHSOLE 12272500482995UNIVERSAL DISPLAY CORPCOM91347P105812080392SHSOLE 58912021480VAIL RESORTS INCCOM91879Q10951466232143SHSOLE 158040074103VALERO ENERGY CORP NEWCOM91913Y10054539587893SHSOLE 4139750173918VENTAS INCCOM92276F1002344719SHSOLE 471900VERIZON COMMUNICATIONS INCCOM92343V1045339111654SHSOLE 64464047190VERTEX PHARMACEUTICALS INCCOM92532F100126652777101SHSOLE 6040680173033VISA INCCOM CL A92826C8392396592003501SHSOLE 15582810445220VULCAN MATLS COCOM92916010931857279029SHSOLE 209715069314WALMART INCCOM931142103737282865SHSOLE 45810037055WASTE CONNECTIONS INCCOM94106B10198213686SHSOLE 1368600WATSCO INCCOM94262220025733142195SHSOLE 74020068175WESTERN ALLIANCE BANCORPCOM95763810957333986636SHSOLE 8306360156000WEX INCCOM96208T10476228486708SHSOLE 3161260170582WNS HOLDINGS LTDSPON ADR92932M10128178621625SHSOLE 3248200296805WORLDPAY INCCL A981558109940281143341SHSOLE 9400210203320WPX ENERGY INCCOM98212B10311546781170SHSOLE 5854400195730WRIGHT MED GROUP N VORD SHS 0.03 PARN9661711819329974251SHSOLE 5087430465508ZAYO GROUP HLDGS INCCOM98919V10526853786094SHSOLE 5920940194000ZENDESK INCCOM98936J10143646911770SHSOLE 5050500406720ZOETIS INCCL A98978V10336541437560SHSOLE 3215100116050ZYNGA INCCL A98986T108471128700SHSOLE 12870000