Sec Form 4 Filing - DOTSON GEORGE S @ ATWOOD OCEANICS INC - 2017-10-06

FORM 4 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 DOTSON GEORGE S 2. Issuer Name and Ticker or Trading Symbol ATWOOD OCEANICS INC [ ATW] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 15011 KATY FREEWAY SUITE 800 3. Date of Earliest Transaction (MM/DD/YY) 10/06/2017 (Street) HOUSTON, TX77094 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 Atwood Oceanics, Inc. Common Stock 10/06/2017 D 48,008 D 0 D

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 Restricted Stock Units ( 2 ) 10/06/2017 D 19,157 ( 2 ) ( 2 ) Atwood Oceanics, Inc. Common Stock 19,157 ( 2 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other DOTSON GEORGE S 15011 KATY FREEWAY SUITE 800 HOUSTON, TX77094 X Signatures /s/ George S. Dotson, Walter A. Baker By Power of Attorney 10/06/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On May 29, 2017, the Issuer entered into an Agreement and Plan of Merger with Ensco PLC ("Parent") and Echo Merger Sub LLC (the "Merger Agreement"). Pursuant to the Merger Agreement, on October 6, 2017, these shares were cancelled and converted into the right to receive 76,812 class A ordinary shares of Parent and a cash payment for fractional shares pursuant to the Merger Agreement. ( 2 )Pursuant to the Merger Agreement, these Restricted Stock Units were canceled and converted into the right to receive 30,651 class A ordinary shares of Parent and a cash payment for fractional shares pursuant to the Merger Agreement. The actual number of class A ordinary shares of Parent issued to the reporting person was reduced by an amount necessary to satisfy applicable tax withholding obligations.

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).

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