Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Pershing Square Capital Management, L.P.
 2. Date of Event Requiring Statement (Month/Day/Year)
01/12/2007		 3. Issuer Name and Ticker or Trading Symbol
CERIDIAN CORP /DE/ [CEN]
(Last)
(First)
(Middle)
888 SEVENTH AVENUE, 29TH FLOOR		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

NEW YORK, NY 10019		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 15,724,334
I
See Footnotes (1) (2) (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Pershing Square Capital Management, L.P.
888 SEVENTH AVENUE, 29TH FLOOR
NEW YORK, NY 10019		     X    
PS Management GP, LLC
888 SEVENTH AVENUE, 29TH FLOOR
NEW YORK, NY 10019		     X    
Pershing Square GP, LLC
888 SEVENTH AVENUE, 29TH FLOOR
NEW YORK, NY 10019		     X    
ACKMAN WILLIAM A
888 SEVENTH AVENUE, 29TH FLOOR
NEW YORK, NY 10019		     X    

Signatures

PERSHING SQUARE CAPITAL MANAGEMENT, L.P. By: PS Management GP, LLC, its General Partner By: /s/ William A. Ackman, Managing Member 01/24/2007
**Signature of Reporting Person Date
PS MANAGEMENT GP, LLC, By: /s/ William A. Ackman, Managing Member 01/24/2007
**Signature of Reporting Person Date
PERSHING SQUARE GP, LLC, By: /s/ William A. Ackman, Managing Member 01/24/2007
**Signature of Reporting Person Date
/s/ William A. Ackman 01/24/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) In addition to Pershing Square Capital Management, L.P. ("PS Capital"), this Form 3 is being filed jointly by PS Management GP, LLC ("PS Management"), Pershing Square GP, LLC ("PSGP") and William A. Ackman ("Ackman"), each of whom has the same business address as PS Capital and may be deemed to have a pecuniary interest in securities beneficially owned by it.
(2) Represents 6,899,332 shares held for the account of Pershing Square, L.P. ("PSI"), 86,343 shares held for the account of Pershing Square II, L.P. ("PSII") and 8,738,659 shares held for the account of Pershing Square International, Ltd. ("PSIL") (the shares held for the accounts of PSI, PSII and PSIL collectively, the "Subject Shares"), all of which are investment funds for which PS Capital acts as investment adviser and PS Capital may be deemed the beneficial owner of the Subject Shares. PS Management is general partner of PS Capital and may be deemed beneficial owner of the Subject Shares. (Continued in footnote 3).
(3) PSGP is general partner of PSI and PSII and may be deemed beneficial owner of shares held for the accounts of PSI and PSII. Ackman is the managing member of PSGP and PS Management and may be deemed beneficial owner of the Subject Shares. Each of PS Capital, PS Management, PSGP and Ackman disclaims beneficial ownership of the securities reported hereon except to the extent of its or his pecuniary interest therein.

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