0001354488-11-002642.txt : 20110812 0001354488-11-002642.hdr.sgml : 20110812 20110812101513 ACCESSION NUMBER: 0001354488-11-002642 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20110630 FILED AS OF DATE: 20110812 DATE AS OF CHANGE: 20110812 EFFECTIVENESS DATE: 20110812 FILER: COMPANY DATA: COMPANY CONFORMED NAME: WESTFIELD CAPITAL MANAGEMENT CO LP CENTRAL INDEX KEY: 0001177719 IRS NUMBER: 800175963 FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-10220 FILM NUMBER: 111029560 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 wcm_13f-hr.txt 13F-HR UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: JUNE 30, 2011 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: SENIOR COMPLIANCE ASSOCIATE Phone: 617-428-7100 Signature, Place, and Date of Signing: /S/Brandi McMahon Boston, Massachusetts August 12, 2011 -------------------- ------------------------- --------------- [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: 304 ------------- Form 13F Information Table Value Total: 16,030,657 ------------- (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 30-Jun-11

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 ------------------------------ -------------- --------- -------- -------- --- ---- ------- -------- -------- ------ ------- ABBOTT LABS COM COM 002824100 537 10210 SH Sole 8870 1340 ACXIOM CORP COM COM 005125109 22832 1741555 SH Sole 1163425 578130 ADTRAN INC COM COM 00738A106 22256 574935 SH Sole 372625 202310 AEGEAN MARINE PETROLEUM NETWRK COM Y0017S102 225 31800 SH Sole 31800 AETNA INC NEW COM COM 00817Y108 239090 5422778 SH Sole 4617049 805729 AIR PRODS & CHEMS INC COM COM 009158106 317 3320 SH Sole 3320 AKORN INC COM COM 009728106 488 69700 SH Sole 69700 ALBEMARLE CORP COM COM 012653101 32775 473620 SH Sole 359575 114045 ALEXION PHARMACEUTICALS INC CO COM 015351109 65871 1400622 SH Sole 905558 495064 ALLIANCE DATA SYSTEMS CORP COM COM 018581108 137075 1457161 SH Sole 1095175 361986 ALPHA NATURAL RESOURCES INC 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438 3000 SH Sole 3000 STARWOOD PPTY TR INC COM COM 85571B105 392 19120 SH Sole 19120 STATE STR CORP COM COM 857477103 156198 3464129 SH Sole 2943839 520290 STEWART ENTERPRISES INC CL A COM 860370105 42871 5872804 SH Sole 3967344 1905460 SUN HEALTHCARE GROUP INC NEW C COM 86677E100 4123 514056 SH Sole 331468 182588 SUNCOR ENERGY INC NEW COM COM 867224107 194107 4964373 SH Sole 4204528 759845 SUPERIOR ENERGY SVCS INC COM COM 868157108 48980 1318795 SH Sole 854025 464770 SYNTEL INC COM COM 87162H103 48020 812245 SH Sole 517370 294875 TALEO CORP CL A COM 87424N104 39861 1076445 SH Sole 696869 379576 TEAM HEALTH HOLDINGS INC COM COM 87817A107 35091 1558894 SH Sole 1060690 498204 TENNECO INC COM COM 880349105 92534 2099707 SH Sole 1570151 529556 TERADATA CORP DEL COM COM 88076W103 38115 633146 SH Sole 482566 150580 TERADYNE INC COM COM 880770102 30878 2086360 SH Sole 1325730 760630 TESORO CORP COM COM 881609101 131495 5739615 SH Sole 4211295 1528320 TEVA PHARMACEUTICAL INDS LTD A COM 881624209 318 6600 SH Sole 6600 THERMO FISHER SCIENTIFIC INC C COM 883556102 1544 23985 SH Sole 19456 4529 TITAN INTL INC ILL COM COM 88830M102 35233 1452310 SH Sole 962820 489490 TRANS1 INC COM COM 89385X105 273 59600 SH Sole 59600 TRANSDIGM GROUP INC COM COM 893641100 1865 20450 SH Sole 20450 TRAVELERS COMPANIES INC COM COM 89417E109 823 14100 SH Sole 8585 5515 TREASURY WINE ESTATES LTD SPON COM 89465J109 78 21503 SH Sole 21503 TRIQUINT SEMICONDUCTOR INC COM COM 89674K103 12768 1252970 SH Sole 813550 439420 TRIUMPH GROUP INC NEW COM COM 896818101 38944 391080 SH Sole 259400 131680 TYCO INTERNATIONAL LTD SHS COM H89128104 80501 1628582 SH Sole 1385092 243490 UMPQUA HLDGS CORP COM COM 904214103 24560 2122710 SH Sole 1373720 748990 UNION PAC CORP COM COM 907818108 292 2800 SH Sole 2800 UNITED TECHNOLOGIES CORP COM COM 913017109 160604 1814533 SH Sole 1564663 249870 UNITED THERAPEUTICS CORP DEL C COM 91307C102 70691 1282965 SH Sole 956895 326070 UROPLASTY INC COM NEW COM 917277204 413 55114 SH Sole 55114 VALERO ENERGY CORP NEW COM COM 91913Y100 161308 6308486 SH Sole 5349976 958510 VERISIGN INC COM COM 92343E102 50977 1523520 SH Sole 969820 553700 VERIZON COMMUNICATIONS INC COM COM 92343V104 624 16760 SH Sole 16760 VERTEX PHARMACEUTICALS INC COM COM 92532F100 63172 1215074 SH Sole 1024264 190810 VIACOM INC NEW CL B COM 92553P201 170918 3351333 SH Sole 2852478 498855 VISTAPRINT N V SHS COM N93540107 30090 628850 SH Sole 417810 211040 VITACOST COM INC COM COM 92847A200 130 26800 SH Sole 26800 WABASH NATL CORP COM COM 929566107 345 36800 SH Sole 36800 WABCO HLDGS INC COM COM 92927K102 32277 467370 SH Sole 302525 164845 WADDELL & REED FINL INC CL A COM 930059100 70528 1940235 SH Sole 1374025 566210 WARNER CHILCOTT PLC IRELAND SH COM G94368100 193787 8030956 SH Sole 6852376 1178580 WASTE CONNECTIONS INC COM COM 941053100 44559 1404306 SH Sole 898944 505362 WATSCO INC COM COM 942622200 27596 405877 SH Sole 281782 124095 WATSON PHARMACEUTICALS INC COM COM 942683103 1858 27040 SH Sole 27040 WEATHERFORD INTERNATIONAL LTD COM H27013103 205381 10953671 SH Sole 9209793 1743878 WESCO INTL INC COM COM 95082P105 43792 809613 SH Sole 516628 292985 WESTLAKE CHEM CORP COM COM 960413102 68359 1317135 SH Sole 919020 398115 WINDSTREAM CORP COM COM 97381W104 588 45370 SH Sole 45370 XUEDA ED GROUP SPONSORED ADR COM 98418W109 14342 1792710 SH Sole 1160620 632090 YAMANA GOLD INC COM COM 98462Y100 1684 144800 SH Sole 144800 ZOLL MED CORP COM COM 989922109 1155 20390 SH Sole 20390 REPORT SUMMARY 304 DATA RECORDS 16030657 0 OTHER MANAGERS ON WHOSE BEHALF REPORT IS FILED