Document:

EX-4.01

 Exhibit 4.01 
 This Note is a Global Security within the meaning of the Indenture hereinafter referred to and is registered in the name of the Depository named below or a nominee of the Depository. This Note is not
exchangeable for Notes registered in the name of a Person other than the Depository or its nominee except in the limited circumstances described herein and in the Indenture, and no transfer of this Note (other than a transfer of this Note as a whole
by the Depository to a nominee of the Depository or by a nominee of the Depository to the Depository or another nominee of the Depository) may be registered except in the limited circumstances described herein. 

Unless this certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation (the
“Depository”), to the Company or its agent for registration of transfer, exchange, or payment, and any certificate issued is registered in the name of Cede & Co. or in such other name as is requested by an authorized
representative of the Depository (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of the Depository), ANY TRANSFER, PLEDGE, OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO
ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. 
 CITIGROUP INC.

 Floating Rate Notes due July 25, 2016 

 

			
	 REGISTERED
	 	REGISTERED
		
		 	CUSIP: 172967 GV 7
		 	ISIN: US172967GV70
		 	Common Code: 095567479
		
	 No. R-0001
	 	$500,000,000

 CITIGROUP INC., a Delaware corporation (the “Company”, which term includes any successor Person
under the Indenture), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of $500,000,000 on July 25, 2016 and to pay interest thereon from and including July 25, 2013 or from the
most recent Interest Payment Date to which interest has been paid or duly provided for, quarterly, on the first day of each January, April, July and October, commencing October 25, 2013, at the rate per annum for each Interest Period of
three-month LIBOR, determined as provided herein, plus 0.960% until the principal hereof is paid or made available for payment. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will, as provided in the
Indenture, be paid to the Person in whose name this Note is registered at the close of business on the Record Date for such interest, which shall be the Business Day immediately preceding such Interest Payment Date. 

Any such interest not so punctually paid or duly provided for will forthwith cease to be payable to the holder on such Record Date and
may either be paid to the Person in whose name this Note is registered at the close of business on a subsequent Record Date, such subsequent Record Date to be not less than five days prior to the date of payment of such defaulted interest, notice
whereof shall be given to holders of Notes of this series not less than 15 days prior to such subsequent Record Date, or be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the
Notes of this series may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture. 

 Interest hereon will be calculated on the basis of the actual number of days elapsed in an
Interest Period and a 360-day year. Dollar amounts resulting from such calculation will be rounded to the nearest cent, with one-half cent being rounded upward. An “Interest Period” shall be the period from and including an Interest
Payment Date (or from July 25, 2013 in the case of the first Interest Payment Date) to and including the day immediately preceding the next Interest Payment Date. 
 If an Interest Payment Date falls on a day that is not a Business Day, such Interest Payment Date will be the next succeeding Business Day. If the Maturity of the Notes falls on a day that is not a
Business Day, the payment due on Maturity will be postponed to the next succeeding Business Day, and no further interest will accrue in respect of such postponement. If a date for payment of interest or principal on the Notes falls on a day that is
not a business day in the place of payment, such payment will be made on the next succeeding business day in such place of payment as if made on the date the payment was due. No interest will accrue on any amounts payable for the period from and
after the due date for payment of such principal or interest. 
 For these purposes, “Business Day” means any day
which is a day on which commercial banks settle payments and are open for general business in The City of New York. 
 Payment
of the principal of and interest on this Note will be made at the office or agency of the Trustee maintained for that purpose in The City of New York. 
 Reference is hereby made to the further provisions of this Note set forth on the reverse hereof, which further provisions shall for all purposes have the same effect as if set forth at this place.

 Unless the certificate of authentication hereon has been executed by the Trustee or by an authenticating agent on behalf of
the Trustee by manual signature, this Note shall not be entitled to any benefit under the Indenture or be valid or obligatory for any purpose. 

  
 2 

 IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its
corporate seal. 
  

							
	Dated: July 25, 2013	 		 	
		 		 	CITIGROUP INC.
				
		 		 	By:	 	  

		 		 	Title:	 	Chief Financial Officer

  

			
	 ATTEST:

		
	By:	 	  

	Title:	 	 Assistant Secretary

  
 3 

 This is one of the Notes of the series issued under the within-mentioned Indenture.

  

							
	Dated: July 25, 2013	 		 	
		 		 	 THE BANK OF NEW YORK MELLON,
 as Trustee

				
		 		 	By:	 	  

		 		 		 	Name:
		 		 		 	Title:
			
		 		 	-or-
			
		 		 	 CITIBANK, N.A.,
 as
Authenticating Agent

				
		 		 	By:	 	  

		 		 		 	Name:
		 		 		 	Title:

  
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 This Note is one of a duly authorized issue of Securities of the Company (the
“Notes”), issued and to be issued in one or more series under the Indenture, dated as of March 15, 1987 (as amended and supplemented to date, the “Indenture”), between the Company and The Bank of New York Mellon, formerly
known as The Bank of New York, as Trustee (the “Trustee”, which term includes any successor trustee under the Indenture), to which Indenture and all indentures supplemental thereto reference is hereby made for a statement of the respective
rights, limitations of rights, duties and immunities thereunder of the Company, the Trustee and the holders of the Notes and of the terms upon which the Notes are, and are to be, authenticated and delivered. This Note is one of the series designated
on the face hereof, limited in aggregate principal to $1,000,000,000. 
 This Note will bear interest for each Interest Period
at a rate determined by Citibank, N.A., acting as Calculation Agent. The interest rate on this Note for a particular Interest Period will be a per annum rate equal to three-month LIBOR as determined on the related Interest Determination Date, plus
0.960%. The Interest Determination Date for an Interest Period will be the second London business day preceding such Interest Period. The Interest Determination Date for the first Interest Period was July 23, 2013. Promptly upon determination,
the Calculation Agent will inform the Trustee and the Company of the interest rate for the next Interest Period. Absent manifest error, the determination of the interest rate by the Calculation Agent shall be binding and conclusive on the holders of
Notes, the Trustee and the Company. 
 A London business day is a day on which dealings in deposits in U.S. dollars are
transacted in the London interbank market. 
 On any Interest Determination Date, LIBOR will be equal to the offered rate for
deposits in U.S. dollars having an index maturity of three months for the next Interest Period, in amounts of at least $1,000,000, as such rate appears on Reuters Screen LIBOR01 at approximately 11:00 a.m., London time, on such Interest
Determination Date. If the Reuters Screen LIBOR01 is replaced by another service or ceases to exist, the Calculation Agent will use the replacing service or such other service that may be nominated by the British Bankers’ Association for the
purpose of displaying London interbank offered rates for U.S. dollar deposits. 
 If no offered rate appears on Reuters Screen
LIBOR01 on an Interest Determination Date at approximately 11:00 a.m., London time, then the Calculation Agent (after consultation with the Company) will select four major banks in the London interbank market and shall request each of their
principal London offices to provide a quotation of the rate at which three-month deposits in U.S. dollars in amounts of at least $1,000,000 are offered by it to prime banks in the London interbank market, on that date and at that time, that is
representative of single transactions at that time. If at least two quotations are provided, LIBOR will be the arithmetic average of the quotations provided. Otherwise, the Calculation Agent will select three major banks in New York City and shall
request each of them to provide a quotation of the rate offered by them at approximately 11:00 a.m., New York City time, on the Interest Determination Date for loans in U.S. dollars to leading European banks having an index maturity of three months
for the applicable Interest Period in an amount of at least $1,000,000 that is representative of single 

  
 5 

 
transactions at that time. If three quotations are provided, LIBOR will be the arithmetic average of the quotations provided. Otherwise, the rate of LIBOR for the next Interest Period will be set
equal to the rate of LIBOR for the current Interest Period. 
 The Luxembourg Stock Exchange shall be notified of the interest
rate, the amount of the interest payment and the Interest Payment Date for a particular Interest Period not later than the first day of such Interest Period. Upon request from any Noteholder, the Calculation Agent will provide the interest rate in
effect on this Note for the current Interest Period and, if it has been determined, the interest rate to be in effect for the next Interest Period. 
 If an event of default (as defined in the Indenture) with respect to Notes of this series shall occur and be continuing, the principal of the Notes of this series may be declared due and payable in the
manner and with the effect provided in the Indenture. 
 The Indenture contains provisions for defeasance at any time of the
entire indebtedness of this Note upon compliance by the Company with certain conditions set forth in Sections 11.03 and 11.04 thereof, which provisions apply to this Note. 
 The Indenture contains provisions permitting the Company and the Trustee, without the consent of the holders of the Securities, to establish, among other things, the form and terms of any series of
Securities issuable thereunder by one or more supplemental indentures, and, with the consent of the holders of not less than 66 2/3% in aggregate principal amount of Securities at the time outstanding which are affected thereby, to modify the
Indenture or any supplemental indenture or the rights of the holders of Securities of such series to be affected, provided that no such modification will (i) extend the fixed maturity of any Securities, reduce the rate or extend the time of
payment of interest thereon, reduce the principal amount thereof or the premium, if any, thereon, reduce the amount of the principal of Original Issue Discount Securities payable on any date, change the currency in which Securities are payable, or
impair the right to institute suit for the enforcement of any such payment on or after the maturity thereof, without the consent of the holder of each Security so affected, or (ii) reduce the aforesaid percentage of Securities of any series the
consent of the holders of which is required for any such modification without the consent of the holders of all Securities of such series then outstanding, or (iii) modify, without the written consent of the Trustee, the rights, duties or
immunities of the Trustee. 
 No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter
or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of and interest on this Note at the times, place and rate, and in the coin or currency, herein prescribed. 

This Note is a Global Security registered in the name of a nominee of the Depository. This Note is exchangeable for Notes registered in
the name of a person other than the Depository or its nominee only in the limited circumstances hereinafter described. Unless and until it is exchanged in whole or in part for definitive Notes in certificated form, this Note may not be transferred
except as a whole by the Depository to a nominee of the Depository or by a nominee of the Depository to the Depository or another nominee of the Depository. 

  
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 The Notes represented by this Global Security are exchangeable for definitive Notes in
certificated form of like tenor as such Notes in denominations of $1,000 and whole multiples of $1,000 in excess thereof only if (i) the Depository notifies the Company that it is unwilling or unable to continue as Depository for the Notes or
(ii) the Depository ceases to be a clearing agency registered under the Securities Exchange Act of 1934, as amended, or (iii) the Company in its sole discretion decides to allow the Notes to be exchanged for definitive Notes in registered
form. Any Notes that are exchangeable pursuant to the preceding sentence are exchangeable for certificated Notes issuable in authorized denominations and registered in such names as the Depository shall direct. As provided in the Indenture and
subject to certain limitations therein set forth, the transfer of definitive Notes in certificated form is registrable in the register maintained by the Company in The City of New York for such purpose, upon surrender of the definitive Note for
registration of transfer at the office or agency of the registrar, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the registrar duly executed by, the holder thereof or his attorney duly
authorized in writing, and thereupon one or more new Notes of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. Subject to the
foregoing, this Note is not exchangeable, except for a Global Security or Global Securities of this issue of the same principal amount to be registered in the name of the Depository or its nominee. 

No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum
sufficient to cover any tax or other governmental charge payable in connection therewith. 
 Prior to due presentment of this
Note for registration of transfer, the Company, the Trustee and any agent of the Company or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and neither
the Company, the Trustee nor any such agent shall be affected by notice to the contrary. 
 The Company will pay additional
amounts (“Additional Amounts”) to the beneficial owner of any Note that is a non-United States person in order to ensure that every net payment on such Note will not be less, due to payment of U.S.
withholding tax, than the amount then due and payable. For this purpose, a “net payment” on a Note means a payment by the Company or a paying agent, including payment of principal and interest, after deduction for any present or future
tax, assessment or other governmental charge of the United States. These Additional Amounts will constitute additional interest on the Note. 

  
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 The Company will not be required to pay Additional Amounts, however, in any of the
circumstances described in items (1) through (14) below. 
  

	 	(1)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is imposed or withheld
solely by reason of the beneficial owner: 

  

	 	(a)	having a relationship with the United States as a citizen, resident or otherwise; 

 

	 	(b)	having had such a relationship in the past or 

  

	 	(c)	being considered as having had such a relationship. 

  

	 	(2)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is imposed or withheld
solely by reason of the beneficial owner: 

  

	 	(a)	being treated as present in or engaged in a trade or business in the United States; 

 

	 	(b)	being treated as having been present in or engaged in a trade or business in the United States in the past or 

 

	 	(c)	having or having had a permanent establishment in the United States. 

  

	 	(3)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is imposed or withheld in
whole or in part by reason of the beneficial owner being or having been any of the following (as such terms are defined in the Internal Revenue Code of 1986, as amended): 

 

	 	(a)	personal holding company; 

  

	 	(b)	foreign personal holding company; 

  

	 	(c)	foreign private foundation or other foreign tax-exempt organization; 

  

	 	(d)	passive foreign investment company; 

  

	 	(e)	controlled foreign corporation or 

  

	 	(f)	corporation which has accumulated earnings to avoid United States federal income tax. 

 

	 	(4)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is imposed or withheld
solely by reason of the beneficial owner owning or having owned, actually or constructively, 10 percent or more of the total combined voting power of all classes of stock of the Company entitled to vote or by reason of the beneficial owner being a
bank that has invested in a Note as an extension of credit in the ordinary course of its trade or business. 

 For purposes of
items (1) through (4) above, “beneficial owner” means a fiduciary, settlor, beneficiary, member or shareholder of the holder if the holder is an estate, trust, partnership, limited liability company, corporation or other entity,
or a person holding a power over an estate or trust administered by a fiduciary holder. 
  

	 	(5)	Additional Amounts will not be payable to any beneficial owner of a Note that is a: 

 

	 	(a)	fiduciary; 

  
 8 

	 	(b)	partnership; 

  

	 	(c)	limited liability company or 

  

	 	(d)	other fiscally transparent entity 

or that is not the sole beneficial owner of the Note, or any portion of the Note. However, this exception to the obligation to pay
Additional Amounts will only apply to the extent that a beneficiary or settlor in relation to the fiduciary, or a beneficial owner or member of the partnership, limited liability company or other fiscally transparent entity, would not have been
entitled to the payment of an Additional Amount had the beneficiary, settlor, beneficial owner or member received directly its beneficial or distributive share of the payment. 

 

	 	(6)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is imposed or withheld
solely by reason of the failure of the beneficial owner or any other person to comply with applicable certification, identification, documentation or other information reporting requirements. This exception to the obligation to pay Additional
Amounts will only apply if compliance with such reporting requirements is required by statute or regulation of the United States or by an applicable income tax treaty to which the United States is a party as a precondition to exemption from such
tax, assessment or other governmental charge. 

  

	 	(7)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is collected or imposed by
any method other than by withholding from a payment on a Note by the Company or a paying agent. 

  

	 	(8)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is imposed or withheld by
reason of a change in law, regulation, or administrative or judicial interpretation that becomes effective more than 15 days after the payment becomes due or is duly provided for, whichever occurs later. 

 

	 	(9)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is imposed or withheld by
reason of the presentation by the beneficial owner of a Note for payment more than 30 days after the date on which such payment becomes due or is duly provided for, whichever occurs later. 

 

	 	(10)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any: 

 

	 	(a)	estate tax; 

  

	 	(b)	inheritance tax; 

  

	 	(c)	gift tax; 

  
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	 	(d)	sales tax; 

  

	 	(e)	excise tax; 

  

	 	(f)	transfer tax; 

  

	 	(g)	wealth tax; 

  

	 	(h)	personal property tax or 

  

	 	(i)	any similar tax, assessment, withholding, deduction or other governmental charge. 

 

	 	(11)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment, or other governmental charge required to be withheld by any
paying agent from a payment of principal or interest on a Note if such payment can be made without such withholding by any other paying agent. 

  

	 	(12)	Additional amounts will not be payable if a payment on a Note is reduced as a result of any tax, assessment or other governmental charge that is required to be made
pursuant to any European Union directive on the taxation of savings income or any law implementing or complying with, or introduced to conform to, any such directive. 

 

	 	(13)	Additional amounts will not be payable if a payment on a Note is reduced as a result of any withholding, deduction, tax, duty assessment or other governmental charge
that would not have been imposed but for a failure by the holder or beneficial owner of a Note (or any financial institution through which the holder or beneficial owner holds the Note or through which payment on the Note is made) to take any action
(including entering into an agreement with the Internal Revenue Service, or a governmental authority of another jurisdiction if the holder is entitled to the benefits of an intergovernmental agreement between that jurisdiction and the United States)
or to comply with any applicable certification, documentation, information or other reporting requirement or agreement concerning accounts maintained by the holder or beneficial owner (or any such financial institution), or concerning ownership of
the holder or beneficial owner, or any substantially similar requirement or agreement. 

  

	 	(14)	Additional Amounts will not be payable if a payment on a Note is reduced as a result of any combination of items (1) through (13) above.

 Except as specifically provided herein, the Company will not be required to make any payment of any tax,
assessment or other governmental charge imposed by any government or a political subdivision or taxing authority of such government. 
 As used in this Note, “United States person” means: 
  

	 	(a)	any individual who is a citizen or resident of the United States; 

  

	 	(b)	any corporation, partnership or other entity created or organized in or under the laws of the United States; 

  
 10 

	 	(c)	any estate if the income of such estate falls within the federal income tax jurisdiction of the United States regardless of the source of such income and

  

	 	(d)	any trust if a United States court is able to exercise primary supervision over its administration and one or more United States persons have the authority to control
all of the substantial decisions of the trust. 

 Additionally,
“non-United States person” means a person who is not a United States person, and “United States” means the states of the United States of America and the District of Columbia, but excluding
its territories and its possessions. 
 Except as provided below, the Notes may not be redeemed prior to maturity. 

 

	 	(1)	The Company may, at its option, redeem the Notes if: 

  

	 	(a)	the Company becomes or will become obligated to pay Additional Amounts as described above; 

 

	 	(b)	the obligation to pay Additional Amounts arises as a result of any change in the laws, regulations or rulings of the United States, or an official position regarding
the application or interpretation of such laws, regulations or rulings, which change is announced or becomes effective on or after July 18, 2013 and 

  

	 	(c)	the Company determines, in its business judgment, that the obligation to pay such Additional Amounts cannot be avoided by the use of reasonable measures available to
it, other than substituting the obligor under the Notes or taking any action that would entail a material cost to the Company. 

  

	 	(2)	The Company may also redeem the Notes, at its option, if: 

  

	 	(a)	any act is taken by a taxing authority of the United States on or after July 18, 2013, whether or not such act is taken in relation to the Company or any
affiliate, that results in a substantial probability that the Company will or may be required to pay Additional Amounts as described above; 

  

	 	(b)	the Company determines, in its business judgment, that the obligation to pay such Additional Amounts cannot be avoided by the use of reasonable measures available to
it, other than substituting the obligor under the Notes or taking any action that would entail a material cost to the Company and 

  

	 	(c)	the Company receives an opinion of independent counsel to the effect that an act taken by a taxing authority of the United States results in a substantial probability
that the Company will or may be required to pay the Additional Amounts described above, and delivers to the Trustee a certificate, signed by a duly authorized officer, stating that based on such opinion the Company is entitled to redeem the Notes
pursuant to their terms. 

 Any redemption of the Notes as set forth in clauses (1) or (2) above shall be in whole, and
not in part, and will be made at a redemption price equal to 100% of the principal amount of the Notes 

  
 11 

 
Outstanding plus accrued interest thereon to the date of redemption. Holders shall be given not less than 30 days’ nor more than 60 days’ prior notice by the Trustee of the date fixed
for such redemption. 
 All terms used in this Note which are defined in the Indenture shall have the meanings assigned to them
in the Indenture. The Notes are governed by the laws of the State of New York. 

  
 12EX-10.1

 Exhibit 10.1 
 FOURTH AMENDMENT TO CREDIT AGREEMENT 
 FOURTH AMENDMENT TO CREDIT AGREEMENT
(this “Fourth Amendment”), dated as of July 24, 2013, by and among ATWOOD OCEANICS, INC., a Texas corporation (the “Parent”), ATWOOD OFFSHORE WORLDWIDE LIMITED, an exempted company organized under the laws of
the Cayman Islands and a Wholly-Owned Subsidiary of the Parent (the “Borrower”), the lenders party hereto (each, a “Lender” and, collectively, the “Lenders”) and NORDEA BANK FINLAND PLC, NEW YORK
BRANCH, as Administrative Agent (in such capacity, the “Administrative Agent”). Unless otherwise indicated, all capitalized terms used herein and not otherwise defined shall have the respective meanings provided such terms in the
Credit Agreement referred to below. 
 W I T N E S S E T H:

 WHEREAS, the Parent, the Borrower, the Lenders from time to time party thereto, and the Administrative Agent are parties to a
Credit Agreement, dated as of May 6, 2011 and amended on November 23, 2011, January 18, 2012 and August 24, 2012 (as further amended, modified or otherwise supplemented, the “Credit Agreement”); 

WHEREAS, subject to the terms and conditions of this Fourth Amendment, the parties hereto wish to amend certain provisions of the Credit
Agreement as herein provided; 
 NOW, THEREFORE, it is agreed: 
 I. Amendments to Credit Agreement. 
 1. Section 1.01 of the Credit
Agreement is hereby amended by (i) deleting the definition “Scheduled Commitment Reduction” in its entirety and (ii) inserting the following new definitions in the appropriate alphabetical order: 

“Commodity Exchange Act” shall mean the Commodity Exchange Act (7 U.S.C. § 1 et seq.), as amended
from time to time, and any successor statute. 
 “ECP” shall have the meaning assigned to such
term in the definition of Excluded Swap Obligation. 
 “Excluded Swap Obligation” shall mean,
with respect to any Credit Party, any Swap Obligation if, and to the extent that, all or a portion of the Guaranty of such Credit Party of, or the grant by such Credit Party of a security interest to secure, such Swap Obligation (or any Guaranty
thereof) is or becomes illegal under the Commodity Exchange Act or any rule, regulation or order of the Commodity Futures Trading Commission (or the application or official interpretation of any thereof) by virtue of such Credit Party’s failure
for any reason to constitute an “eligible contract participant” as defined in the Commodity Exchange Act and the regulations thereunder (each an “ECP”) at the time the Guaranty of such Credit Party or the grant of such
security interest becomes effective with respect to such Swap Obligation. If a Swap Obligation arises under a master agreement governing more than one swap, such exclusion shall apply only to the portion of such Swap Obligation that is attributable
to swaps for which such guarantee or security interest is or becomes illegal. 
 “Qualified ECP
Guarantor” shall mean, in respect of any Swap Obligation, each Credit Party that has total assets exceeding $10,000,000 at the time the relevant guarantee or the grant of the relevant security interest becomes effective with respect to such
Swap Obligation or such other person as constitutes an ECP under the Commodity Exchange Act or any regulations promulgated thereunder and can cause another person to qualify as an ECP at such time by entering into a keepwell under
Section 1a(18)(A)(v)(II) of the Commodity Exchange Act. 

 “Swap Obligation” means, with respect to any Guarantor, any
obligation to pay or perform under any agreement, contract or transaction that constitutes a “swap” within the meaning of section 1a(47) of the Commodity Exchange Act. 

2. The definition of “Guaranteed Obligations” appearing in Section 1.01 of the Credit Agreement is hereby amended by
inserting the text “(other than Excluded Swap Obligations)” immediately after the text “(even if such Lender subsequently ceases to be a Lender under this Agreement for any reason)” appearing in such definition. 

3. The definition of “Obligations” appearing in Section 1.01 of the Credit Agreement is hereby amended by inserting
the following sentence at the end thereof: 
 “Notwithstanding anything to the contrary contained herein or in any other
Credit Document, in no event will the Obligations include any Excluded Swap Obligations.” 
 4. The definition of
“Other Obligations” appearing in Section 1.01 of the Credit Agreement is hereby amended by inserting the text “and Excluded Swap Obligations” immediately after the text “but excluding, for the avoidance of doubt,
any Obligations” and immediately prior to the close parentheses (“)”) appearing in such definition. 
 5.
Section 4.02(a) of the Credit Agreement is hereby amended by deleting the text “and shall be applied to reduce the Scheduled Commitment Reductions as of the date of such reduction in direct order of maturity” immediately prior to the
period (“.”) at the end of such Section. 
 6. Section 4.03 of the Credit Agreement is hereby amended by
(i) deleting the text set forth in subsection (b) in its entirety and inserting the text “[reserved]” in lieu thereof and (ii) deleting the text set forth in subsection (c) in its entirety and inserting the text
“[reserved]” in lieu thereof. 
 7. Section 4.03(e) of the Credit Agreement is hereby amended by deleting the text
“Sections 4.03(g) and 10.09” and inserting the text “Section 10.09” in lieu thereof. 
 8. The Credit
Agreement is hereby amended by deleting Section 4.03(g) in its entirety. 
 9. Section 10.04(vii) of the Credit
Agreement is hereby amended by deleting the text set forth therein in its entirety and inserting the text “so long as no Default or Event of Default then exists or would result therefrom, additional Indebtedness of the Parent or of Subsidiaries
of the Parent, provided that (a) both before and after giving effect to such additional Indebtedness, the Parent and its Subsidiaries shall be in pro forma compliance with the financial covenants contained in Sections
10.07, 10.08 and 10.10, (b) such additional Indebtedness shall not be secured by any Collateral and (c) such additional Indebtedness, if incurred by a Credit Party, shall be in compliance with Section 10.15;” in lieu thereof.

 10. Section 10.15(c)(II)(iii) of the Credit Agreement is hereby amended by inserting the text “(so long as, in the
case of Indebtedness incurred pursuant to Section 10.04(vii), such Indebtedness complies with the requirements of the preceding clause 10.15(c)(II)(ii) or clause 10.15(c)(II)(i))” immediately prior to the text “or permitted pursuant
to Section 10.05(xv);”. 

  
 2 

 11. The Credit Agreement is hereby further amended by inserting the following new
Section 13.10 immediately after Section 13.09 thereof: 
 “13.10 Keepwell. Each Qualified ECP Guarantor
hereby jointly and severally absolutely, unconditionally and irrevocably undertakes to provide such funds or other support as may be needed from time to time by each other Guarantor to honor all of its obligations under the guarantee contained
herein in respect of Swap Obligations (provided, however, that each Qualified ECP Guarantor shall only be liable under this Section 13.10 for the maximum amount of such liability that can be hereby incurred without rendering its obligations
under this Section 13.10, or otherwise under this Agreement, voidable under applicable law relating to fraudulent conveyance or fraudulent transfer, and not for any greater amount). The obligations of each Qualified ECP Guarantor under this
Section 13.10 shall remain in full force and effect until the discharge of the Guaranteed Obligations in full. Each Qualified ECP Guarantor intends that this Section 13.10 constitute, and this Section 13.10 shall be deemed to
constitute, a “keepwell, support, or other agreement” for the benefit of each other Guarantor for all purposes of Section 1a(18)(A)(v)(II) of the Commodity Exchange Act.”. 

12. Section 14.12(a)(Z) of the Credit Agreement is hereby amended by deleting the text “(7) reduce the amount of, or extend the
date of, any Scheduled Commitment Reduction without the consent of the Majority Lenders of the respective Tranche of Commitments affected thereby” in its entirety and inserting the text “(7) [Reserved]” in lieu thereof. 

II. Amendments to the U.S. Subsidiaries Guaranty. 
 1. Paragraph 1 of the U.S. Subsidiaries Guaranty is hereby amended by inserting the following sentence at the end of the first paragraph thereof: 

“Notwithstanding anything to the contrary contained herein or in any other Credit Document, in no event will the Guaranteed
Obligations include any Excluded Swap Obligations.” 
 2. The Subsidiaries Guaranty is hereby further amended by inserting
the following new Section 28 immediately after Section 27 thereof: 
 “28. Keepwell. Each Qualified ECP
Guarantor hereby jointly and severally absolutely, unconditionally and irrevocably undertakes to provide such funds or other support as may be needed from time to time by each other Guarantor to honor all of its obligations under the guarantee
contained herein in respect of Swap Obligations (provided, however, that each Qualified ECP Guarantor shall only be liable under this Section 28 for the maximum amount of such liability that can be hereby incurred without rendering its
obligations under this Section 28, or otherwise under this Agreement, voidable under applicable law relating to fraudulent conveyance or fraudulent transfer, and not for any greater amount). The obligations of each Qualified ECP Guarantor under
this Section 28 shall remain in full force and effect until the discharge of the Guaranteed Obligations in full. Each Qualified ECP Guarantor intends that this Section 28 constitute, and this Section 28 shall be deemed to constitute,
a “keepwell, support, or other agreement” for the benefit of each other Guarantor for all purposes of Section 1a(18)(A)(v)(II) of the Commodity Exchange Act.”. 

  
 3 

 III. Miscellaneous Provisions. 

1. In order to induce the Lenders to enter into this Fourth Amendment, the Borrower hereby represents and warrants that (i) no
Default or Event of Default exists as of the Fourth Amendment Effective Date (as defined herein) before or after giving effect to this Fourth Amendment and (ii) all of the representations and warranties contained in the Credit Agreement or the
other Credit Documents are true and correct in all material respects on the Fourth Amendment Effective Date both before and after giving effect to this Fourth Amendment, with the same effect as though such representations and warranties had been
made on and as of the Fourth Amendment Effective Date (it being understood that any representation or warranty that by its terms is made as of a specific date shall be true and correct in all material respects as of such specific date). 

2. This Fourth Amendment is limited precisely as written and shall not be deemed to (i) be a waiver of or a consent to the
modification of or deviation from any other term or condition of the Credit Agreement or the other Credit Documents or any of the other instruments or agreements referred to therein, or (ii) prejudice any right or rights which any of the
Lenders or the Administrative Agent now have or may have in the future under or in connection with the Credit Agreement, as amended hereby, the other Credit Documents or any of the other instruments or agreements referred to therein. The
Administrative Agent, the Collateral Agent and the Lenders expressly reserve all their rights and remedies except as expressly set forth in this Fourth Amendment. 
 3. This Fourth Amendment may be executed in any number of counterparts and by the different parties hereto on separate counterparts, each of which counterparts when executed and delivered shall be an
original, but all of which shall together constitute one and the same instrument. A complete set of counterparts shall be lodged with the Borrower and the Administrative Agent. 
 5. THIS FOURTH AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF NEW YORK. 

6. This Fourth Amendment shall become effective on the date (the “Fourth Amendment Effective Date”) when (i) the
Parent, the Borrower and the Required Lenders shall have signed a counterpart hereof (whether the same or different counterparts) and shall have delivered (including by way of facsimile or other electronic transmission) the same to White &
Case LLP, 1155 Avenue of the Americas, New York, NY 10036; Attention: May Yip (facsimile number: 212-354-8113 / email: myip@whitecase.com) and Kendra Kocovsky (facsimile number: 212-354-8113 / email: kendra.kocovsky@whitecase.com) and
(ii) the Borrower shall have paid to the Administrative Agent all reasonable out-of-pocket costs and expenses in connection with the Fourth Amendment (including, without limitation, the reasonable fees and expenses of White & Case
LLP). 
 7. From and after the Fourth Amendment Effective Date, all references in the Credit Agreement and each of the other
Credit Documents to the Credit Agreement shall be deemed to be references to the Credit Agreement, as modified hereby. 

*     *     * 

  
 4 

 IN WITNESS WHEREOF, the parties hereto have caused their duly authorized officers to execute
and deliver this Fourth Amendment as of the date first above written. 
  

			
	ATWOOD OCEANICS, INC.
		
	By	 	/s/ Robert J. Saltiel
		 	Name: Robert J. Saltiel
		 	Title: President & Chief Executive Officer

  

			
	ATWOOD OFFSHORE WORLDWIDE LIMITED
		
	By	 	/s/ A. H. Dyne
		 	Name: A. H. Dyne
		 	Title: Director

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	 NORDEA BANK FINLAND PLC, NEW YORK
 BRANCH, as Administrative Agent

		
	By	 	/s/ Martin Lunder
		 	Name: Martin Lunder
		 	Title: Senior Vice President

 
			
		
	By	 	/s/ Lynn Sauro
		 	Name: Lynn Sauro
		 	Title: Vice President

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	NORDEA BANK FINLAND PLC, NEW YORK BRANCH, as Lender
		
	By	 	/s/ Martin Lunder
		 	Name: Martin Lunder
		 	Title: Senior Vice President
		
	By	 	/s/ Lynn Sauro
		 	Name: Lynn Sauro
		 	Title: Vice President

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	DNB Bank ASA, Grand Cayman Branch
		
	By	 	/s/ Stian Lovseth
		 	Name: Stian Lovseth
		 	Title: First Vice President
		
	By	 	/s/ Evan Uhlick
		 	Name: Evan Uhlick
		 	Title: Vice President

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	HSBC Bank USA, N.A.
		
	By	 	/s/ Ryan Smith
		 	Name: Ryan Smith
		 	Title: Vice President

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	Wells Fargo Bank, N.A.
		
	By	 	/s/ T. Alan Smith
		 	Name: T. Alan Smith
		 	Title: Managing Director

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	BNP PARIBAS S.A.
		
	By	 	/s/ S. Berveros-Canpagne
		 	Name: S. Berveros-Canpagne
		 	Title: Head of Offshore
		
	By	 	/s/ Paul Barnes
		 	Name: Paul Barnes
		 	Title: Managing Director

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	ING Capital LLC
		
	By	 	/s/ Richard Ennis
		 	Name: Richard Ennis
		 	Title: Managing Director

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	 SIGNATURE PAGE TO THE FOURTH
 AMENDMENT TO
 CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD
OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED, VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT

	
	NIBC Bank N.V.
		
	By	 	 /s/ Rob ten Heggeler

		 	Name: Rob ten Heggeler
		 	Title: Member of the Managing Board
		
	By	 	 /s/ Jeroen van der Putten

		 	Name: Jeroen van der Putten
		 	Title: Associate Director

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	Regions Bank
		
	By	 	 /s/ David Valentine

		 	Name: David Valentine
		 	Title: Vice President

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	Skandinaviska Enskilda Banken AB (publ)
		
	By:	 	 /s/ Per Olav Bucher-Johannessen

		 	Name: Per Olav Bucher-Johannessen
		 	Title:
		
	By:	 	 /s/ Kristin Kongsrud

		 	Name: Kristin Kongsrud
		 	Title:

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	BARCLAYS BANK PLC
		
	By:	 	 /s/ Vanessa A. Kurbatskiy

		 	Name: Vanessa A. Kurbatskiy
		 	Title: Vice President

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	CREDIT SUISSE AG, CAYMAN ISLANDS BRANCH
		
	By	 	 /s/ Mikhail Faybusovich

		 	Name: Mikhail Faybusovich
		 	Title: Authorized Signatory
		
	By	 	 /s/ Tyler R. Smith

		 	Name: Tyler R. Smith
		 	Title: Authorized Signatory

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	Natixis
		
	By:	 	 /s/ Louis P. Laville III

		 	Name: Louis P. Laville III
		 	Title: Managing Director
		
	By:	 	 /s/ Stuart Murray

		 	Name: Stuart Murray
		 	Title: Managing Director

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	CREDIT INDUSTRIEL ET COMMERCIAL
		
	By:	 	 /s/ Andrew McKuin

		 	Name: Andrew McKuin
		 	Title: Vice President
		
	By:	 	 /s/ Alex Aupoix

		 	Name: Alex Aupoix
		 	Title: Managing Director

  
 Signature
page to Fourth Amendment to Credit Agreement 

 
			
	SIGNATURE PAGE TO THE FOURTH AMENDMENT TO CREDIT AGREEMENT, DATED AS OF THE DATE FIRST WRITTEN ABOVE, AMONG ATWOOD OCEANICS, INC., ATWOOD OFFSHORE WORLDWIDE LIMITED,
VARIOUS LENDERS PARTY HERETO AND NORDEA BANK FINLAND PLC, NEW YORK BRANCH, AS ADMINISTRATIVE AGENT
	
	ITF International Transport Finance Suisse AG
		
	By:	 	 /s/ Natalja Formuzala

		 	Name: Natalja Formuzala
		 	Title: Vice President
		
	By:	 	 /s/ Alexander Schaffert

		 	Name: Alexander Schaffert
		 	Title: Senior Vice President

  
 Signature
page to Fourth Amendment to Credit Agreement

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