13F-HR 1 d482836d13fhr.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: 12/31/12 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: SC X Management, LLC Address: 3000 Sand Hill Road Bldg 4, Suite 250 Menlo Park, CA 94025 Form 13F File Number: 28-12108 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: Douglas Leone Title: Managing Member Phone: (650) 854-3927 Signature, Place, and Date of Signing: /s/ Douglas Leone Menlo Park, California 02/13/13 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 reported 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).) ================================================================================ FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 Form 13F Information Table Entry Total: 3 Form 13F Information Table Value Total: $ 412,167 (Thousands) List 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. NONE SC X MANAGEMENT, LLC FORM 13F INFORMATION TABLE 12/31/2012

COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 ~~VOTING~~-------- ~~AUTHORITY~~-------- ~~NAME~~--------- OF--------- ------------------- ---------- -------- ---------------------- VOTING AUTHORITY TITLE OF VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER ---------------------- NAME OF ISSUER CLASS CUSIP (X $1000) PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE ~~ALCATEL....~~-------------- ~~ADR~~-------- ~~013904305~~--------- ~~419~~--------- ~~148,083~~---------- SH--- ~~SOLE~~---- ~~148,083~~---------- -------- ---------- ------ ---- AMAZON.COM INC~~......~~ COMMON 023135106 56,~~344~~200 24,714 SH SOLE 24,714 INFOBLOX INC. COMMON 45672H104 152,361 8,478,606 SH SOLE 8,478,606 RUCKUS WIRELESS INC. COMMON 781220108 253,606 11,256,364 SH SOLE 11,256,364

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