13F-HR 1 y35149e13fvhr.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, 2007 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: Chieftain Capital Management, Inc. Address: 12 East 49th Street, New York, New York 10017 Form 13F File Number: 28-1658 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: Thomas D. Stern Title: Managing Director Phone: (212) 421-9760 Signature, Place, and Date of Signing: /s/ Thomas D. Stern New York, New York May 15, 2007 ------------------------------------- ------------------------- ------------ 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: 8 Form 13F Information Table Value Total: $3,773,943 (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 FORM 13F INFORMATION TABLE

COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 -------------------------------------------------------------------------------------------------------------------------------- TITLE OF VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY NAME OF ISSUER CLASS CUSIP [x$1000] PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE -------------------------------------------------------------------------------------------------------------------------------- COMCAST CORP NEW CL A SPL 20030N 20 0 1,414,978 55,554,703 SH SOLE 55,554,703 UNITEDHEALTH GROUP INC COM 91324P 10 2 712,052 13,442,561 SH SOLE 13,442,561 LABORATORY CORP AMER HOLDINGS COM NEW 50540R 40 9 558,690 7,692,279 SH SOLE 7,692,279 RYANAIR HOLDINGS PLC SPONSORED ADR 783513 10 4 443,184 9,894,700 SH SOLE 9,894,700 CROSSTEX ENERGY INC COM 22765Y 10 4 233,399 8,118,218 SH SOLE 8,118,218 AMERICAN TOWER CORP CL A 029912 20 1 210,980 5,416,700 SH SOLE 5,416,700 NIKE INC CL B 654106 10 3 186,718 1,757,178 SH SOLE 1,757,178 CROSSTEX ENERGY LP COM 22765U 10 2 13,942 387,166 SH SOLE 387,166