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, 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: Century Capital Management, LLC Address: 100 Federal Street, 29th Floor Boston, MA 02110 13F File Number: 28-10890 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: Julie Smith Title: Chief Financial Officer Phone: 617-482-3060 Signature, Place, and Date of Signing: /S/ Julie Smith Boston, MA May 10, 2013 Report Type (Check only one.): [ X] 13F HOLDINGS REPORT. [ ] 13F NOTICE. [ ] 13F COMBINATION REPORT. FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 Form13F Information Table Entry Total: 152 Form13F Information Table Value Total: $2,941,269 (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form 13F file number(s) of all institutional managers with respect to which this report is filed, other than the manager filing this report. NONE FORM 13F INFORMATION TABLE VALUE SHARES/ SH/ PUT/ INVSTMT OTHER VOTING AUTHORITY NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DSCRETN MANAGERS SOLE SHARED NONE ------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- -------- 3M Co. COM 88579Y101 2036 19156 SH SOLE 19156 ANSYS, Inc. COM 03662Q105 25309 310848 SH SOLE 249378 61470 AO Smith Corp COM 831865209 20241 275125 SH SOLE 220704 54421 Acadia Healthcare Co., Inc. COM 00404A109 8451 287539 SH SOLE 287539 Actavis Inc. COM 00507k103 3707 40244 SH SOLE 40244 Adobe Systems, Inc. COM 00724F101 3832 88074 SH SOLE 88074 Aegion Corp COM 00770F104 9865 426124 SH SOLE 150609 275515 Air Methods Corp. COM 009128307 22862 473919 SH SOLE 166288 307631 Akamai Technologies, Inc. COM 00971T101 26989 764779 SH SOLE 338512 426267 Alexion Pharmaceuticals, Inc. 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