Sec Form 5 Filing - COLE JON C @ ENSCO INTERNATIONAL INC - 2005-12-31

FORM 5 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP 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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1. Name and Address of Reporting Person COLE JON C 2. Issuer Name and Ticker or Trading Symbol ENSCO INTERNATIONAL INC [ ESV] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) X __ Other (specify below) Senior Vice President/Previous Employee (Last) (First) (Middle) 3427 DEL MONTE DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 12/31/2005 (Street) HOUSTON, TX77019 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 06/30/2005 M V 50,000 ( 1 ) A $ 25,755 ( 2 ) 0 D Common Stock 12/31/2005( 3 ) A V 89.2747 ( 4 ) A $ 29.79 ( 5 ) 1,010.171 ( 6 ) I ENSCO Savings Plan

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Employee Stock Option (Right to Buy) $ 25.755 06/30/2005 M V 25,000 04/01/2004 08/15/2005( 7 ) Common Stock 0 $ 25.755 25,000 D Employee Stock Option (Right to Buy) $ 25.755 06/20/2005 M V 25,000 04/01/2004 08/15/2005( 7 ) Common Stock 25,000 $ 25.755 25,000 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other COLE JON C 3427 DEL MONTE DRIVE HOUSTON, TX77019 Senior Vice President Previous Employee Signatures /s/ Cary A. Moomjian, Jr., by Power of Attorney 02/09/2006 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Reporting person disposed/sold a total of 50,000 shares via two (2) transactions. On June 20, 2005 reporting person exercised 25,000 employee options (right to buy) and on June 30, 2005 reporting person exercised an additional 25,000 employee options (right to buy) and sold the shares associated therewith. ( 2 )The option price for both transactions accomplished by the reporting person during the month of June 2005 was $25.755. The option exercise price for the June 20, 2005 transaction was $37.8188. The option exerciseprice for the June 30, 2005 transaction was $36.1257. ( 3 )Transaction date is issuer's fiscal year end of 12/31/05. ( 4 )Amount is representative of shares acquired, and held indirectly, through previous normal payroll contributions to the ENSCO Savings Plan and subsequent reinvestment(s) for the months of January 2005 throughDecember 2005. The reporting person was no longer an ENSCO employee as of May 16, 2005. ( 5 )Price of securities dependent upon trading price applicable on date of future transactions. The average cost/price is representative of all beneficially, indirectly owned securities acquired through previous normal payroll contributions to the ENSCO Savings Plan and subsequent reinvestment(s) as of 12/31/05. The reporting person was no longer an ENSCO employee as of May 16, 2005. ( 6 )Amount is representative of common stock acquired, and held indirectly, through previous normal payroll contributions to the ENSCO Savings Plan and subsequent reinvestment(s) as of 12/31/05. The reporting personwas no longer an ENSCO employee as of May 16, 2005. ( 7 )Expiration date is ninety (90) days after termination of employment. The reporting person was no longer an ENSCO employee as of May 16, 2005.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(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).

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