Type	Name	Date
Credit agreement	Fourth Amendment to Amended and Restated Credit Agreement, by and among Atwood Oceanics, Inc., Atwood Oceanics Worldwide Limited, the lenders party thereto and Nordea Bank AB, London Branch, as administrative agent	03/29/2016
Credit agreement	Second Amendment to Amended and Restated Credit Agreement, by and among Atwood Oceanics, Inc., Atwood Oceanics Worldwide Limited, the lenders and the issuing lender party thereto and Nordea Bank AB, London Branch, as administrative agent	03/06/2015
Credit agreement	Amended and Restated Credit Agreement, among Atwood Oceanics, Inc., Atwood Offshore Worldwide Limited, the lenders party thereto and Nordea Bank Finland Plc, London Branch, as administrative agent (included in	04/11/2014
Credit agreement	Third Amendment to Credit Agreement among Atwood Oceanics, Inc., Atwood Offshore Worldwide Limited, the lenders party thereto and Nordea Bank Finland Plc, New York Branch, as administrative agent	08/28/2012
Credit agreement	First Amendment to Credit Agreement among Atwood Oceanics, Inc., Atwood Offshore Worldwide Limited, Various Lenders and Nordea Bank Finland Plc, New York Branch	01/18/2012
Credit agreement	Credit Agreement	05/09/2011
Credit agreement	FIRST AMENDMENT TO CREDIT AGREEMENT	05/05/2010
Credit agreement	Credit Agreement	11/26/2008

Type	Name	Date
Equity incentive plans	Second Amendment to Atwood Oceanics, Inc. 2013 Long-Term Incentive Plan	05/27/2016
Employment agreement	Employment Agreement between Robert J. Saltiel and Atwood Oceanics, Inc.	12/14/2009

Type	Name	Date
Merger agreement	Agreement and Plan of Merger, by and among Ensco plc, Echo Merger Sub LLC and Atwood Oceanics, Inc	05/30/2017