0001354488-13-002383.txt : 20130506 0001354488-13-002383.hdr.sgml : 20130506 20130506084832 ACCESSION NUMBER: 0001354488-13-002383 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20130331 FILED AS OF DATE: 20130506 DATE AS OF CHANGE: 20130506 EFFECTIVENESS DATE: 20130506 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: 13814563 BUSINESS ADDRESS: STREET 1: ONE FINANCIAL CENTER STREET 2: 24FL CITY: BOSTON STATE: MA ZIP: 02111 BUSINESS PHONE: 6174287100 MAIL ADDRESS: STREET 1: ONE FINANCIAL CENTER STREET 2: 24FL CITY: BOSTON STATE: MA ZIP: 02111 FORMER COMPANY: FORMER CONFORMED NAME: WESTFIELD CAPITAL MANAGEMENT CO LLC DATE OF NAME CHANGE: 20020717 13F-HR 1 b83072_13f.txt QUARTER ONE SECURITIES AND EXCHANGE COMMISSION Washington, StateD.C. 20549 Form 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 31, 2013 ------------------ Check here if Amendment [ ]; Amendment Number: ______ This Amendment (Check only one.): [ ] is a restatement. [ ] adds new holdings entries. Institutional Investment Manager Filing this Report: Name: Westfield Capital Management Company, L.P. ------------------------------------------ Address: 1 Financial Center ------------------------------------------ Boston, Massachusetts 02111 ------------------------------------------ Form 13F File Number: 28-10220 The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables are considered integral parts of this form. Person Signing this Report on Behalf of Reporting Manager: Name: Brandi McMahon -------------------- Title: Compliance Manager -------------------- Phone: 617-428-7100 -------------------- Signature, Place, and Date of Signing: /s/Brandi McMahon Boston, Massachusetts March 8, 2013 ------------------ ---------------------- ----------------- [Signature] [City, State] [Date] Report Type (Check only one.): [ X ] 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.) [ ] 13F NOTICE. (Check here if no holdings are in this report, and all holdings are reported by other reporting manager(s).) [ ] 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).) List of Other Managers Reporting for this Manager: [If there are no entries in this list, omit this section.] Form 13F File Number Name 28-___________________ _________________________________ FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 ------------------- Form 13F Information Table Entry Total: 322 ------------------- Form 13F Information Table Value Total: 14,745,137 ------------------- (thousands) Lists of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. [If there are no entries in this list, state "NONE" and omit the column headings and list entries.] No. Form 13F File Number Name ____ 28-____________________ NONE ------------------ [Repeat as necessary.] Westfield Capital Management FORM 13F 31-Mar-13

Voting Authority -------------------------- Value Shares/ Sh/ Put/ Invstmt Other Name of Issuer Title of class CUSIP (x$1000) Prn Amt Prn Call Dscretn Managers Sole Shared None ------------------------------ -------------- --------- -------- ------- --- ---- ------- -------- ------ ------ ---- 3M CO COM COM 88579Y101 207 1943 SH Sole 243 1700 ABBVIE INC COM 00287Y109 2265 55540 SH Sole 54200 1340 ACCURAY INC COM 004397105 349 75200 SH Sole 75200 ACTAVIS INC COM 00507K103 105431 1144617 SH Sole 951897 192720 ACUITY BRANDS INC COM COM 00508Y102 13686 197340 SH Sole 127410 69930 AIR METHODS CORP COM PAR $.06 COM 009128307 263 5450 SH Sole 5450 AIR PRODS & CHEMS INC COM COM 009158106 1233 14150 SH Sole 10830 3320 ALBEMARLE CORP COM COM 012653101 20498 327870 SH Sole 230770 97100 ALEXANDER & BALDWIN INC NEW CO COM 014491104 35004 979145 SH Sole 626840 352305 ALKERMES PLC SHS COM G01767105 75814 3198915 SH Sole 1968275 1230640 ALLIANCE DATA SYSTEMS CORP COM COM 018581108 186760 1153624 SH 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COM 754730109 66165 1435250 SH Sole 886100 549150 RED HAT INC COM COM 756577102 47691 943260 SH Sole 760540 182720 REINSURANCE GROUP AMER COM COM 759351604 26812 449340 SH Sole 314870 134470 RENT A CTR INC NEW COM COM 76009N100 28558 773099 SH Sole 499940 273159 REXNORD CORP NEW COM COM 76169B102 5723 269566 SH Sole 167720 101846 REYNOLDS AMERICAN INC COM COM 761713106 934 21000 SH Sole 21000 RIVERBED TECHNOLOGY INC COM COM 768573107 19489 1306240 SH Sole 794695 511545 ROCKWOOD HLDGS INC COM COM 774415103 40366 616845 SH Sole 375035 241810 ROUSE PPTYS INC COM COM 779287101 351 19400 SH Sole 19400 ROWAN COMPANIES LTD COM G7665A101 65937 1864730 SH Sole 1155540 709190 RPX CORP COM COM 74972G103 292 20700 SH Sole 20700 S & W SEED COMPANY COM 785135104 285 27100 SH Sole 27100 SALESFORCE COM INC COM COM 79466L302 121389 678791 SH Sole 577706 101085 SANMINA SCI CORP COM 801056102 2477 217830 SH Sole 135460 82370 SANOFI AVENTIS SPONSORED ADR COM 80105N105 1442 28240 SH Sole 28240 SBA COMMUNICATIONS CORP COM COM 78388J106 25926 360080 SH Sole 228960 131120 SCHLUMBERGER LTD COM COM 806857108 616 8229 SH Sole 5074 3155 SERVICE CORP INTL COM COM 817565104 56582 3382040 SH Sole 2055740 1326300 SIGNET JEWELERS LIMITED SHS COM G81276100 70248 1048480 SH Sole 727835 320645 SKYWORKS SOLUTIONS INC COM COM 83088M102 85397 3877284 SH Sole 2695374 1181910 SMUCKER J M CO COM 832696405 902 9100 SH Sole 9100 SOLARWINDS INC COM COM 83416B109 19251 325728 SH Sole 207640 118088 SPX CORP COM 784635104 23802 301445 SH Sole 212880 88565 STANLEY BLACK & DECKER INC COM COM 854502101 185845 2295232 SH Sole 1868307 426925 STARBUCKS CORP COM COM 855244109 125400 2201937 SH Sole 1872817 329120 STARWOOD HOTELS&RESORTS WRLDWD COM 85590A401 21829 342520 SH Sole 237950 104570 STATE STR CORP COM COM 857477103 85795 1451935 SH Sole 1203815 248120 STEELCASE INC CL A COM 858155203 35749 2426937 SH Sole 1508345 918592 STERIS CORP COM COM 859152100 28987 696630 SH Sole 432920 263710 STEWART ENTERPRISES INC CL A COM 860370105 56970 6112654 SH Sole 3947254 2165400 SUNCOR ENERGY INC NEW COM COM 867224107 79748 2657378 SH Sole 2197453 459925 SUPERIOR ENERGY SVCS INC COM COM 868157108 33774 1300510 SH Sole 808730 491780 SWIFT TRANSN CO CL A COM 87074U101 28507 2010364 SH Sole 1249995 760369 SYNERON MEDICAL LTD ORD SHS COM M87245102 352 34420 SH Sole 34420 TEAM HEALTH HOLDINGS INC COM COM 87817A107 37984 1044103 SH Sole 648955 395148 TERADATA CORP DEL COM COM 88076W103 24261 414651 SH Sole 291191 123460 TERRA NITROGEN CO L P COM UNIT COM 881005201 220 1000 SH Sole 1000 TESORO CORP COM COM 881609101 292713 4999364 SH Sole 3333574 1665790 THERMO FISHER SCIENTIFIC INC C COM 883556102 167210 2186040 SH Sole 1906221 279819 TIFFANY & CO NEW COM COM 886547108 21313 306480 SH Sole 213370 93110 TIMKEN CO COM COM 887389104 45041 796051 SH Sole 483266 312785 TITAN INTL INC ILL COM COM 88830M102 37930 1799322 SH Sole 1145495 653827 TRACTOR SUPPLY CO COM 892356106 34143 327893 SH Sole 203523 124370 TRANSDIGM GROUP INC COM COM 893641100 106821 698542 SH Sole 452313 246229 TRIUMPH GROUP INC NEW COM COM 896818101 21459 273369 SH Sole 177539 95830 TUPPERWARE CORP COM 899896104 1403 17170 SH Sole 17170 U S PHYSICAL THERAPY COM COM 90337L108 325 12100 SH Sole 12100 ULTIMATE SOFTWARE GROUP INC CO COM 90385D107 20576 197544 SH Sole 126185 71359 UNION PAC CORP COM COM 907818108 399 2800 SH Sole 2800 UNITED FIRE GROUP INC COM COM 910340108 357 14000 SH Sole 14000 UNITED RENTALS INC COM COM 911363109 67808 1233540 SH Sole 797890 435650 UNITED TECHNOLOGIES CORP COM COM 913017109 170736 1827420 SH Sole 1573310 254110 UNITEDHEALTH GROUP INC COM COM 91324P102 217 3800 SH Sole 3800 URBAN OUTFITTERS INC COM COM 917047102 57900 1494575 SH Sole 908825 585750 VALERO ENERGY CORP NEW COM COM 91913Y100 244729 5379829 SH Sole 4417549 962280 VALIDUS HOLDINGS LTD COM SHS COM G9319H102 32341 865430 SH Sole 557790 307640 VALUEVISION MEDIA INC CL A COM 92047K107 389 112400 SH Sole 112400 VENTAS INC COM 92276F100 345 4719 SH Sole 4719 VERIZON COMMUNICATIONS INC COM COM 92343V104 92833 1888764 SH Sole 1638554 250210 VIACOM INC NEW CL B COM 92553P201 100505 1634768 SH Sole 1352758 282010 VISA INC COM CL A COM 92826C839 189560 1116108 SH Sole 948816 167292 VOLCANO CORPORATION COM COM 928645100 35367 1588798 SH Sole 965735 623063 WARNER CHILCOTT PLC IRELAND SH COM G94368100 69096 5099338 SH Sole 4136833 962505 WASTE CONNECTIONS INC COM COM 941053100 54518 1515241 SH Sole 925498 589743 WATSCO INC COM COM 942622200 49416 587032 SH Sole 382107 204925 WEATHERFORD INTERNATIONAL LTD COM H27013103 21691 1786710 SH Sole 1472920 313790 WESCO INTL INC COM COM 95082P105 88895 1224275 SH Sole 849875 374400 WEX INC COM COM 96208T104 8436 107460 SH Sole 66810 40650 WHITEWAVE FOODS CO-A COM 966244105 23234 1361124 SH Sole 1061204 299920 WHOLE FOODS MKT INC COM COM 966837106 105847 1220136 SH Sole 988194 231942 WILLIAMS SONOMA INC COM COM 969904101 93541 1815627 SH Sole 1293479 522148 WILLIS GROUP HOLDINGS PUBLIC L COM G96666105 16006 405310 SH Sole 334050 71260 WNS HOLDINGS LTD SPON ADR COM 92932M101 28334 1922251 SH Sole 1195150 727101 WYNDHAM WORLDWIDE CORP COM COM 98310W108 1186 18400 SH Sole 18400 WYNN RESORTS LTD COM COM 983134107 16318 130380 SH Sole 101240 29140 XILINX INC COM COM 983919101 17039 446410 SH Sole 314470 131940 XPO LOGISTICS INC COM COM 983793100 22277 1322888 SH Sole 822112 500776 REPORT SUMMARY 322 DATA RECORDS 14745137 0 OTHER MANAGERS ON WHOSE BEHALF REPORT IS FILED