0001193125-12-169930.txt : 20120419 0001193125-12-169930.hdr.sgml : 20120419 20120419101604 ACCESSION NUMBER: 0001193125-12-169930 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20120331 FILED AS OF DATE: 20120419 DATE AS OF CHANGE: 20120419 EFFECTIVENESS DATE: 20120419 FILER: COMPANY DATA: COMPANY CONFORMED NAME: FRONTIER CAPITAL MANAGEMENT CO LLC CENTRAL INDEX KEY: 0000351173 IRS NUMBER: 042715137 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-01185 FILM NUMBER: 12767518 BUSINESS ADDRESS: STREET 1: 99 SUMMER ST CITY: BOSTON STATE: MA ZIP: 02110 BUSINESS PHONE: 6172610777 MAIL ADDRESS: STREET 1: 99 SUMMER ST CITY: BOSTON STATE: MA ZIP: 02110 FORMER COMPANY: FORMER CONFORMED NAME: FRONTIER CAPITAL MANAGEMENT CO INC DATE OF NAME CHANGE: 19990326 FORMER COMPANY: FORMER CONFORMED NAME: FRONTIER CAPITAL MANAGEMENT CORP DATE OF NAME CHANGE: 19810306 13F-HR 1 d337310d13fhr.txt FORM 13F UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 31, 2012 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: Frontier Capital Management Co., LLC Address: 99 Summer Street, 19th Floor Boston, MA 02110 13F File Number: 28-01185 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: Mr. William J. Ballou Title: Chief Operating Officer & General Counsel Phone: (617) 261-0777 Signature, Place and Date of Signing: /S/ William J. Ballou Boston, MA April 19, 2012 -------------------------- --------------------- ----------------- [Signature] [City, State] [Date] Report Type [X] 13F HOLDINGS REPORT [_] 13F NOTICE [_] 13F COMBINATION REPORT I am signing this report as required by the Securities Exchange Act of 1934. FRONTIER CAPITAL MANAGEMENT FORM 13F SUMMARY PAGE AS OF DATE: 03/31/12 RUN DATE: 04/02/12 2:16 P.M. REPORT SUMMARY: NUMBER OF OTHER INCLUDED MANAGERS: 0 FORM 13F INFORMATION TABLE ENTRY TOTAL: 321 FORM 13F INFORMATION TABLE VALUE TOTAL: $9,836,486,871.00 LIST OF OTHER INCLUDED MANAGERS: NO. 13F FILE NUMBER NAME

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